Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks.
Early writing and Alphabets
When people first began to write, they did not use an alphabet. Instead, they drew small pictures to (1)........ the objects they were writing about. This was very slow because there was a different picture for every word.
The Ancient Egyptians had a (2).......... of picture writing that was called hieroglyphics. The meaning of this writing was forgotten for a very long time but in 1799 some scientists (3)............ a stone near Alexandria, in Egypt. The stone had been there for over a thousand years. It had both Greek and hieroglyphics on it and researchers were finally able to understand what the hieroglyphics meant.
An alphabet is quite different from picture writing. It (4)............ of letters or symbols that represent a sound and each sound is just part of one word. The Phoenicians, who lived about 3,000 years ago, developed the modern alphabets. It was later improved by the Roman's and this alphabet is now used (5)........... throughout the world.
(5)...........................
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Lời giải:
Báo saiA. broadly (adv) chung chung, rộng to
B. widely (adv) rộng rãi bởi nhiều người, ở nhiều nơi
C. deeply (adv) sâu
D. hugely (adv) cực kì, rất nhiều
Giải thích: Ở đây nói về bảng chữ cái được sử dụng rộng rãi, phổ biến nên widely phù hợp nhất.
Câu hỏi liên quan
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The relationship between students and teachers is (1)_________formal in the USA than in many other countries, especially at the college level. American college students do not stand up when their teacher enters the room. Students are generally encouraged to ask questions in class, to stop in the professor's of lice for extra help, and to phone if they are absent and need a(n) (2)_________. Most teachers allow students to enter class late or leave early, if necessary. Despite the lack of formality, students are still expected to be polite to their teacher and fellow classmates. When students want to ask questions, they usually (3)__________a hand and wait to be called on. When the teacher or a student is speaking to the class, it is rude to begin whispering (4)_________another classmate. When a test is being given, talking to' a classmate is not only rude but also risky. Most American teachers consider that students who are talking to each other (5) _________a test are cheating.
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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions:
How is the news different from entertainment? Most people would answer that news is real but entertainment is fiction. However, if we think more carefully about the news, it becomes clear that the news is not always real. The news does not show us all the events of the day, but stories from a small number of chosen events. The creation of news stories is subject to specific constraints, much like the creation of works of fiction. There are many constraints, but three of the most important ones are: commercialism, story formulas, and sources.
Newspapers, radio, and TV stations are businesses, all of which are rivals for audiences and advertising revenue. The amount of time that the average TV station spends on news broadcasts has grown steadily over the last fifty years - largely because news is relatively cheap to produce, yet sells plenty of advertising. Some news broadcasts are themselves becoming advertisements. For example, during one week in 1996 when the American CBS network was airing a movie about the sinking of the Titanic, CBS news ran nine stories about that event (which had happened 84 years before). The ABC network is owned by Disney Studios, and frequently runs news stories about Mickey Mouse. Furthermore, the profit motive drives news organizations to pay more attention to stories likely to generate a large audience, and to shy away from stories that may be important but dull. This pressure to be entertaining has produced shorter, simpler stories: more focus on celebrities than people of substance, more focus on gossip than on news, and more focus on dramatic events than on nuanced issues.
As busy people under relentless pressure to produce, journalists cannot spend days agonizing over the best way to present stories. Instead, they depend upon certain story formulas, which they can reuse again and again. One example is known as the inverted pyramid. In this formula, the journalist puts the most important information at the beginning of the story, than adds the next most important, and so on. The inverted pyramid originates from the age of the telegraph, the idea being that if the line went dead halfway through the story, the journalist would know that the most crucial information had at least been relayed. Modern journalists still value the formula for a similar reason. Their editors will cut stories if they are too long. Another formula involves reducing a complicated story into a simple conflict. The best example is "horse race" election coverage. Thorough explication of the issues and the candidates' views is forbiddingly complex. Journalists therefore concentrate more on who is winning in the opinion polls, and whether the underdog can catch up in the numbers than on politicians' campaign goals.
Sources are another constraint on what journalists cover and how they cover it. The dominant sources for news are public information officers in businesses and government offices. The majority of such officers try to establish themselves as experts who are qualified to feed information to journalists. How do journalists know who is an expert? In general, they don't. They use sources not on the basis of actual expertise, but on the appearance of expertise and the willingness to share it. All the major news organizations use some of the same sources (many of them anonymous), so the same types of stories always receive attention. Over time, the journalists may even become close friends with their sources, and they stop searching for alternative points of view. The result tends to be narrow, homogenized coverage of the same kind.According to paragraph 3, an advantage of the inverted pyramid formula for journalists is that _.
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Choose the item among A, B, C or D that best answers the question about the passage:
"Ann Whitney, a student at Colorado University, first had a problem taking tests when she began college. “I was always well prepared for my tests. Sometimes I studied for weeks before a test. Yet I would go into taking the test, only to find I couldn’t answer the questions correctly. I would blank out because of nervousness and fear. I couldn’t think of the answer. My low grades on the tests did not show what I know to the teacher.” Another student in microbiology had similar experience.
These two young students were experiencing something called anxiety. Because a student worries and is uneasy about a test, his or her mind does not work as well as it usually does. The student cannot write or think clearly because of the extreme tension and nervousness. Although poor grades are often a result of poor study habits, sometimes test anxiety causes the low grades. Recently, test anxiety has been recognized as a real problem, not just an excuse or a false explanation of lazy students.
Special university counseling courses try to help students. In these courses, counselors try to help students by teaching them how to manage test anxiety.
An expert at the University of California explains, “With almost all students, relaxation and less stress are left after our program. Most of them experience better control during their tests. Almost all have some improvement.""3. To deal with this problem, students say they want to…..
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Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage:
"Like any other universities, the Open University can give you a degree. However, you don’t have to (1)…. working to study. It can also open up a whole variety (2)….. interest. If you have (3)….. studied before, you will enjoy the special, new pleasure of (4)….. your knowledge. You will make friends of (5)….. kinds. You may also (6)…. that your qualification provides new career opportunities.
You don’t actually (7)…. to the Open University for lectures, but study at home, using television, radio and Computer software. You can (8)….. one class a month if you wish at an Open University centre. Of course, there are exams to take, as in (9)….. university. If you (10)….like to know more, all you have to do is to complete the form below. It could be the start of a wonderful new period in your life."10. If you (10)….like to know more, all you have to do is to complete the form below.
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
Transportation accounts for up to one–third of greenhouse gas emissions from the world’s biggest cities and traffic is the largest source of toxic air pollution. To create sustainable, healthy and liveable cities, we need to increase the number of cyclists on our streets, and that means getting more women on their bikes. In San Francisco, only 29% of cyclists are women; in Barcelona, there are three male cyclists for every female cyclist; in London, 37% of cyclists are female.
Surveys reveal that potential cyclists of all genders are deterred by similar concerns, including aggressive and speeding drivers, the threat posed by large vehicles such as lorries and buses, and bike theft. However, women disproportionately view protected cycle lanes as a more urgent priority.
According to research about women and cycling in San Francisco, cities should invest in protected cycle lanes with consistent and clear signage that function as a joined–up network to encourage female riders. Together with more secure cycle parking, these infrastructure investments would make cycling safer, supporting those who already cycle and encouraging those who do not yet ride.
People do what they perceive to be possible. Research in San Francisco found that women, especially women of colour, felt that “people like me” do not cycle. Similarly, 49% of people in London say they do not feel cycling is for “people like them”. More diverse and inclusive imagery of cyclists (in policy documents, in the media and on city streets) could help challenge these perceptions and make more people feel that cycling is for everyone. Social events that enable women to try cycling in a relaxed environment, perhaps as part of a buddy or mentor system that pairs experienced cyclists with those newer to cycling, can help make cycling more accessible and inclusive, along with approaches such as female–led maintenance classes. The different decisions men and women make about cycling are not only based on issues of convenience or comfort. People’s perceptions of safety influence how, when, where and why they travel. Women and girls learn early on to worry about their personal safety when out and about, and to change their behaviour, dress, speech and travel patterns to avoid sexual harassment or violence. Cities must take women’s and girls’ safety considerations seriously through initiatives such as safety audits.Which of the following can be inferred from the passage?
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
We get great pleasure from reading. The more advanced a man is, the greater delight he will find in reading. The ordinary man may think that subjects like philosophy or science are very difficult and that if philosophers and scientists read these subjects, it is not for pleasure. But this is not true. The mathematician finds the same pleasure in his mathematics as the school boy in an adventure story. For both, it is a play of the imagination, a mental recreation and exercise.
The pleasure derived from this activity is common to all kinds of reading. But different types of books give us different types of pleasure. First in order of popularity is novel-reading. Novels contain pictures of imaginary people in imaginary situations, and give us an opportunity of escaping into a new world very much like our world and yet different from it. Here we seem to live a new life, and the experience of this new life gives us a thrill of pleasure.
Next in order of popularity are travel books, biographies and memoirs. These tell us tales of places we have not seen and of great men in whom we are interested. Some of these books are as wonderful as novels, and they have an added value that they are true. Such books give us knowledge, and we also find immense pleasure in knowing details of lands we have not seen and of great men we have only heard of.
Reading is one of the greatest enjoyments of life. To book-lovers, nothing is more fascinating than a favorite book. And, the ordinary educated man who is interested and absorbed in his daily occupation wants to occasionally escape from his drudgery into the wonderland of books for recreation and refreshment.
According to the passage, travel books, biographies and memoirs ______.
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All living cells in an animal's body require energy to power the various chemical processes going in inside them. This energy is ultimately supplied by the food that animals eat. These chemical processes are collectively referred to as metabolism, and one of the byproducts of metabolism is heat. Metabolic rates vary significantly between species. Warm-blooded animals (birds and mammals) have metabolic rates about five to ten times higher than those of similarly sized cold-blooded ones (reptiles, amphibians, and fishes). And it is precisely because birds and mammals have such high metabolic rates that they are able to keep their bodies warm.
The terms warm-blooded and cold-blooded are still in everyday use, but they are not entirely precise. Anyone who has handled a snake knows this because a snake’s body actually feels quite warm. But very little of the snake’s body heat originates internally, from its cells, most of it having been supplied from the outside, either by the sun or by a heat lamp. Instead of referring to reptiles as cold- blooded, they are best described as ectothermic, meaning “outside heat”. Similarly, birds and mammals are said to be endothermic, meaning “inside heat”.
There are advantages and disadvantages to each thermal strategy. Reptiles are usually sluggish first thing in the morning, their body temperatures having dropped during the cool of the night. Accordingly, they have to bask in the sun to raise their body temperatures, but once they have warmed up sufficiently, they can go about their business. By altering between the sun when they are too cool, and the shade when they are too warm, many reptiles are able to maintain their body temperatures at optimum levels of about 95°F or more. Endotherms, on the other hand, maintain temperatures of about 98°F all the time, so they are always ready for action.
I used to keep a crocodile. He had very sharp teeth, and I had to be careful how I handled him during the daytime, when he was warm. But I could do whatever I wanted at night, when he was cold, without any fear of being bitten. The obvious disadvantage of being ectothermic is that the animal’s activity levels are dependent upon the environment. But its low metabolic rates mean that it requires far less food, which is an advantage. I used to feed the crocodile a tiny piece of liver once a week, while the family cat demanded three meals every day. We should therefore not think that reptiles are inferior to mammals and birds; they are just different.What can be inferred from the passage?
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According to some accounts, the first optical telescope was accidentally invented in the 1600s by children who put two glass lenses together while playing with them in a Dutch optical shop. The owner of the shop, Hans Lippershey, looked through the lenses and was amazed by the way they made the nearby church look so much larger. Soon after that, he invented a device that he called a “looker”, a long thin tube where light passed in a straight line from the front lens to the viewing lens at the other end of the tube. In 1608 he tried to sell his invention unsuccessfully. In the same year, someone described the “looker” to the Italian scientists Galileo, who made his own version of the device. In 1610 Galileo used his version to make observations of the Moon, the planet Jupiter, and the Milky Way. In April of 1611, Galileo showed his device to guests at a banquet in his honor. One of guests suggested a name for the device: telescope
When Isaac Newton began using Galileo’s telescope more than a century later, he noticed a problem. The type of telescope that Galileo designed is called a refractor because the front lens bends, or refracts, the light. However, the curved front lens also caused the light to the separated into colors. This meant that when Newton looked through the refracting telescope, the images of bright objects appeared with a ring of colors around them. This sometimes interfered with viewing. He solved this problem by designing a new type of telescope that used a curved mirror. This mirror concentrated the light and reflected a beam of light to the eyepiece at the other end of the telescope. Because Newton used a mirror, his telescope was called a reflector
Very much larger optical telescopes can now be found in many parts of the world, built on hills and mountains far from city lights. The world’s largest refracting telescope is located at the Yerkes Observatory in Williams Bay, Wisconsin. Another telescope stands on Mount Palomar in California. This huge reflecting telescope was for many years the largest reflecting telescope in the world until an even larger reflecting telescope was built in the Caucasus Mountains. A fourth famous reflector telescope, the Keck Telescope situated on a mountain in Hawaii, does not use a single large mirror to collect the light. Instead, the Keck uses the combined light that falls on thirty- six mirrors
Radio telescopes, like optical telescopes allow astronomers to collect data from outer space, but they are different in important ways. First of all, they look very different because instead of light waves, they collect radio waves. Thus, in the place of lenses or mirror, radio telescopes employ bowl-shaped disks that resemble huge TV satellite dished. Also, apart from their distinctive appearance, radio telescope and optical telescopes use different methods to record the information they collect. Optical telescopes use cameras to take photographs of visible objects, while radio telescopes use radio receivers to record radio waves from distant object in space.What did Newton notice about Galileo’s telescope when he used it?
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Henry is the undisputed star of Dronfield School near Sheffield. Whatever the achievements of other members of the comprehensive school, it is Henry, with his soulful eyes and glossy hair, who has hogged the limelight, appearing on television in Britain and abroad. Yet despite all the public adulation, Henry stirs up no envy or resentment among the 2000 students – in fact, they all adore him. The dog, who first arrived six months ago, is a super dog, who has improved students’ behaviour and encouraged more students to focus on their academic achievement.
Andrew Wainwright, a student at Dronfield School, says there is something magical and calming about being able to interact with Henry during his time at the school’s catch-up classes, and that if he falls behind, that opportunity will be denied. Even doubting staff have finally been won round. Perhaps that is because Henry, who lies on the floor during staff meetings, has also had a calming effect on them.
It was Andrew’s teacher, Wendy Brown and the school counsellor, Julie Smart, who first proposed buying a school dog. “Julie and I were talking one day about how looking after dogs can positively affect children’s conduct,” says Brown. “We did some research and discovered that the presence of pets has been shown to be therapeutic. A number of studies have shown that animals improve recovery after surgery or illness and have a calming influence on people in a lot of settings. Some of my kids can be a handful and some of the children Julie counsels have terrible problems.”
Could the school dog become a craze? Other schools such as the Mulberry Bush, a primary school for children with behavioural problems, have stepped forward to point out they already have one. Rosie Johnston, a Mulberry staff member has been bringing her golden retriever, Muskoka, into school for three years. Apart from being a calming influence, Muskoka even plays his part in literacy lessons. Children at the school can be too shy to read to adults so they read to Muskoka. “Their anxiety about mispronouncing something or getting the words in the wrong order is reduced when they read to him,” says Johnston.
Psychologist Dr Deborah Wells from Queen's University Belfast specialises in animal-human interaction. She believes that the underlying key to the Henry effect is that dogs offer unconditional love and that cheers up adults and children and helps with self-esteem. But traditionalist Chris Woodhead, the former chief inspector of schools says, “I don’t see why a teacher cannot create a positive learning environment through the subject they teach and their personality. Dogs strike me as a bit of a publicity stunt. It’s the kind of sentimental story journalists love.” Despite this sentiment, Henry remains as popular as ever.The word “one” in paragraph 4 refers to .
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Franklin D. Roosevelt, the 32nd President of the United States, was from a wealthy well- known family. As a child, he attended private school, had private tutors, and traveled with his parents to Europe. He attended Harvard University, and afterward studied law. At age 39, Roosevelt suddenly developed polio, a disease that left him without the full use of his legs for the rest of his life. Even though the worst of his illness, however, he continued his life in politics. In 1942 he appeared at the Democratic National Convention to nominate Al Smith for president, and eight years after that he himself was nominated for the same office. Roosevelt was elected to the presidency during the Great Depression of the 1930s, at a time when more than 5,000 banks had failed and thousands of people were out of work. Roosevelt took action. First he declared a bank holiday that closed all the banks so no more could fail; then he reopened the banks little by little with government support. Roosevelt believed in using the full power of government to help what he called the “forgotten people”. And it was these workers, the wage earners, who felt the strongest affection toward Roosevelt. There were others, however, who felt that Roosevelt’s policies were destroying the American system of government, and they opposed him in the same intense way that others admired him
In 1940 the Democrats nominated Roosevelt for an unprecedented third term. No president in American history had ever served three terms, but Roosevelt felt an obligation not to quit while the United States’ entry into World War II was looming in the future. He accepted the nomination and went on to an easy victory.aThe word “full” in the first paragraph could be best replaced by which of the following?
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The blue whale is the largest animal ever known to have existed. During the 20th century, the species was almost exterminated due to commercial whaling. The species has slowly recovered following the global whaling ban but it remains endangered and faces a number of serious threats including ship strikes and the impact of climate change.
Blue whales are simply enormous with most ranging in length from 24-30 m. The largest ever recorded was a gargantuan 33.5 m long. Females are up to 10 m longer than males. And they can weigh up to 200 tonnes. Just to put that in perspective: an adult male African elephant weighs 6 tonnes. The blue whale's heart is the size of a small car and its beat can be detected two miles away. But that's nothing compared to their calls. Blue whales are the loudest animals on earth and their calls are louder than a jet engine: reaching 188 decibels, while a jet's engine hit 'just' 140 decibels. Apart from their gigantic size, blue whales can be identified by their relatively small dorsal fin, a fairly rounded rostrum (anterior part of the skull), and approximately 90 ventral grooves, which reach the navel. They also have row of 300-400 baleen plates on each side of the mouth, which are black in color and range in length from 50 cm in front to 100 cm in back.
Blue whales mostly travel alone or in groups of 2-3. Larger groups of up to 60 whales have been reported and are probably associated with feeding grounds. However, the blue whale has the most powerful voice in the animal kingdom and its low-frequency sounds can travel in deep water over hundreds, or even thousands, of miles. Under these circumstances, animals which may appear to us to be traveling alone may actually be in constant contact with one another.
At birth, a blue whale calf is the largest baby on earth: approximately 8m long and weighing about 4 tonnes. They grow at a rate of 90 kg per day and wean after 7-8 months, once they have reached about 15 m in length, and are able to follow the normal migration pattern alone. They reach sexual maturity at 5-10 years. This growth rate is astonishing and is probably the fastest in the animal kingdom. From conception to weaning, it represents a several billion-fold increase in tissue in just over a year and a half. Like other baleen whales, the blue whale has no teeth so it is hard to tell its age but scientists believe they live until at least 50.
Like other large whales, blue whales are threatened by chemical and sound pollution, habitat loss, overfishing of krill, ship strikes and becoming entangled in fishing gear. Climate change could also have a major impact on its food supply, since global warming and associated ocean acidification may impact krill populations. In addition, frontal zones - critical whale habitats - are projected to move further south due to climate change. Frontal zones are boundaries between different water masses, where water can rise from the depths, bringing with it large amounts of nutrients that stimulate the growth of phytoplankton and support substantial populations of prey species for whales. Blue whales would have to migrate further (perhaps 200-500 km more) to reach and feed at these food-rich areas where they build up reserves to sustain themselves for the rest of the year. These longer migration paths could increase the energy costs of migration and reduce the duration of the main feeding season. As frontal zones move southward, they also move closer together, reducing the overall area of foraging habitat available.Which of the following is NOT correct about the blue whale's physical description?
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Modern technologies have changed the way that people communicate with one another. These technologies provide new and innovative ways for people to communicate -- text messaging, email, chat and social networks. They allow faster and more efficient communication and can help build relationships. However, modern technologies can also have negative effects such as limiting personal contact and straining relationships. The nature of the effect depends in large part on the type of relationship.
Modern technologies limit the amount of separation between work and home. With the advent of computers, the Internet and cell phones people can -- and are often expected to -- address work issues from home. This can limit family interactions and cause conflict between family members. The use of Internet and television by children and teenagers also limits the amount time spent with family and can increase conflict between children and their parents.
Young people use modern technologies in increasing numbers to communicate with their friends. Text messaging and online chats have become the preferred method of youth communication. A California State University and UCLA study indicates that for young people face-to-face interactions are less desirable than modern modes of communication. This preference could cause an inability to form lasting friendships or difficulty understanding social cues. Others believe that modern technologies increase communication and therefore strengthen friendships.
Starting new relationships -- romantic and otherwise -- can be difficult. Modern technologies allow people to make new connections without the fears characteristic of face-to-face contact. The anonymity and low risk is what makes Internet dating and social networks popular ways of meeting people. However, this anonymity can also be dangerous. In April 2011, a woman sued an online dating site after allegedly being raped by a man she met online.
Modern technologies allow couples to be in contact with each other more than ever before. This can lead to increased expectations and conflict. With the increasing use of cell phones and email, people often expect an instant reply to communication. A delayed reply -- or none at all -- can lead to suspicion and anger. The use of social networks can also affect relationships. Information that was once private -- such as relationship conflicts -- is now part of the public sphere.What does the phrase “this preference” in paragraph 3 refer to?
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The human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without a hitch. The score is determined by how well you read lines of letters of different sizes from 20 feet away. But being able to read the bottom line on the eye chart does not approximate perfection as far as other species are concerned. Most birds would consider us very visually handicapped. The hawk, for instance, has such sharp eyes that it can spot a dime on the sidewalk while perched on top of the Empire State Building.
It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina. And in water, humans are farsighted, while the kingfisher, swooping down to spear fish, can see well in both the air and water because it is endowed with two foveae - areas of the eye, consisting mostly of cones, that provide visual distinctions. One fovea permits the bird, while in the air, to scan the water below with one eye at a time. This is called monocular vision. Once it hits the water, the other fovea joins in, allowing the kingfisher to focus both eyes, like binoculars, on its prey at the same time.
A frog’s vision is distinguished by its ability to perceive things as a constant motion picture. Known as “bug detectors”, a highly developed set of cells in a frog’s eyes responds mainly to moving objects. So, it is said that a frog sitting in a field of dead bugs wouldn’t see them as food and would starve. The bee has a “compound” eye, which is used for navigation. It has 15,000 facets that divide what it sees into a pattern of dots, or mosaic. With this kind of vision, the bee sees the sun only as a single dot, a constant point of reference. Thus, the eye is a superb navigational instrument that constantly measures the angle of its line of flight in relation to the sun. A bee’s eye also gauges flight speed. And if that is not enough to leave our 20/20 “perfect vision” paling into insignificance, the bee is capable of seeing something we can’t - ultraviolet light.
Thus, what humans consider to be “perfect vision” is in fact rather limited when we look at other species. However, there is still much to be said for the human eye. Of all the mammals, only humans and some primates can enjoy the pleasures of color vision.According to the passage, “bug detectors” are useful for .
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Recreational diving or sport diving is a type of diving that uses scuba equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels of training, experience and equipment.
Recreational scuba diving grew out of related activities such as snorkeling and underwater hunting. For a long time, recreational underwater excursions were limited by the amount of breath that could be held. However, the invention of the aqualung in 1943 by Jacques-Yves Cousteau and its development over subsequent years led to a revolution in recreational diving. However, for much of the 1950s and early1960s, recreational scuba diving was a sport limited to those who were able to afford or make their own kit, and prepared to undergo intensive training to use it. As the sport became more popular, manufacturers became aware of the potential market, and equipment began to appear that was easy to use, affordable and reliable. Continued advances in' SCUBA technology, such as buoyancy compensators, modern diving regulators, wet or dry suits, and dive computers, increased the safety, comfort and convenience of the gear encouraging more people to train and use it.
Until the early 1950s, navies and other organizations performing professional diving were the only providers of diver training, but only for their own personnel and only using their own types of equipment. There were no training courses available to civilians who bought the first scuba equipment. Professional instruction started in 1959 when the non-profit National Association of Underwater Instructors was formed.
Further developments in technology have reduced the cost of training and diving. Scuba- diving has become a popular leisure activity, and many diving locations have some form of dive shop presence that can offer air fills, equipment and training. In tropical and sub-tropical parts of the world, there is a large market in holiday divers, who train and dive while on holiday, but rarely dive close to home. Generally, recreational diving depths are limited to a maximum of between 30 and 40 meters (100 and 130 feet), beyond which a variety of safety issues make it unsafe to dive using recreation diving equipment and practices, and specialized training and equipment for technical diving are needed.According to the second paragraph, in the 1950s and early 1960s, recreational scuba diving was a sport limited because _.
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The tourist looking at the African savannah on a summer afternoon might be excused for thinking that the wide yellow grass plain was completely deserted of life, almost a desert. With only a few small thorn trees sticking out through the veldt, there seems to be almost no place for a living creature to hide.
However, under those trees you might find small steenbok, sleeping in the shade, and waiting for the night to fall. There may even be a small group of lions somewhere, their bodies exactly the same shade as the tall grass around them. In the holes in the ground a host of tiny creatures, from rabbits and badgers to rats and' snakes are waiting for the heat to finish.
The tall grass also hides the fact that there may be a small stream running across the middle of the plain. One clue that there may be water here is the sight of a majestic Marshall eagle circling slowly over the grassland. When he drops, he may come up with a small fish, or maybe a grass snake that has been waiting at the edge of a pool in the hope of catching a frog.
The best time to see the animals then, is in the evening, just as the sun is setting. The best time of the year to come is in late September, or early August, just before the rains. Then the animals
must come to the waterholes, as there is no other place for them to drink. And they like to come while it is still light; so they can see if any dangers are creeping up on them.
So it is at sunset, and after the night falls, that the creatures of the African veld rise and go about their business.The word "he" in paragraph 3 refers to
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Film is an illusion because the moving pictures seen on the screen are not moving at all. A film is actually a series of tiny still pictures, or flames. They appear to be moving because the retina of the human eye retains the impression of an object for a split second after that object has actually disappeared. This principle is known as the persistence of vision. When we look at a single frame of film, the image persists in the brain's visual center for a fraction of a second. Then, the next frame comes along and the brain has to catch up with the new image. Thus, our eyes and brain trick US into thinking that we see a smoothly moving image rather than a series of still ones.
Another illusion of film is known collectively as special effects, the tricks and techniques that filmmakers use when makeup, costume, and stunts are still not enough to make a scene convincing. Special effects artists apply science to filmmaking, showing US things that no plain camera could ever photograph. Even since the introduction of computer graphics in recent decades, the films of today still rely on some special effects that have existed since the early years of cinema.
One category of special effects is called optical or visual effects, tricks made with the camera. One of the pioneers of optical effects was the French filmmaker Georges Méliès, who invented a technique called stop-motion photography. With this technique, a scene is filmed, the camera is stopped, the scene is changed in some way, and then the camera rolls again. Stop motion photography can create the illusion of an actor disappearing on screen. In one short film, an actor's clothes keep returning to his body as he tries to get undressed. Méfiés also invented a technique known as split screen. By putting a card over the camera lens, he prevented half of the frame of film from being exposed. He filmed a scene on the uncovered half of the frame and then backed up the same strip of film in his camera. For the second shot, he covered the exposed half and took another series of pictures on the half that had been covered the first time. With the technique of split screen, it is possible to achieve illusions such as having the same actor play twins.
Mechanical effects are another category of special effects. Mechanical effects are objects or devices used during the filming to create an illusion, such as feathers or plastic chips to simulate snow, and wires to create the illusion that people are flying. Many sound effects are mechanical effects. Wood blocks create a horse's hoof beats, and a vibrating sheet of metal sounds like thunder. During the silent film era, the music machine called the Kinematophone was popular because it could produce the sounds of sirens, sleigh bells, gunfire, baby cries, and kisses-all at the press of a key.
Other mechanical effects are puppets, robots of all sizes, and tiny copies of buildings or cities. To reduce the cost of studio sets or location photography, special-effects technicians create painted or projected backgrounds, which replace the set or add to it. For example, in a long shot of a town, the set might be only a few feet high, and the remainder of the town is painted onto a sheet of glass positioned in front of the camera during filming. In a 1916 silent film called The Flying Torpedo, mechanical effects created the appearance of an enemy invasion of the California seacoast. Technicians threw small contact- rigged explosives into toy cities, scattering the tiny buildings into the air. An artist painted a row of battleships on a board that was only six feet long. Carpenters drilled small holes in the ships, which were filled with small charges of flash powder to simulate guns. An electrician wired the charges so they could be fired on cue from a small battery. For audiences of t -
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According to some accounts, the first optical telescope was accidentally invented in the 1600s by children who put two glass lenses together while playing with them in a Dutch optical shop. The owner of the shop, Hans Lippershey, looked through the lenses and was amazed by the way they made the nearby church look so much larger. Soon after that, he invented a device that he called a “looker”, a long thin tube where light passed in a straight line from the front lens to the viewing lens at the other end of the tube. In 1608 he tried to sell his invention unsuccessfully. In the same year, someone described the “looker” to the Italian scientists Galileo, who made his own version of the device. In 1610 Galileo used his version to make observations of the Moon, the planet Jupiter, and the Milky Way. In April of 1611, Galileo showed his device to guests at a banquet in his honor. One of guests suggested a name for the device: telescope
When Isaac Newton began using Galileo’s telescope more than a century later, he noticed a problem. The type of telescope that Galileo designed is called a refractor because the front lens bends, or refracts, the light. However, the curved front lens also caused the light to the separated into colors. This meant that when Newton looked through the refracting telescope, the images of bright objects appeared with a ring of colors around them. This sometimes interfered with viewing. He solved this problem by designing a new type of telescope that used a curved mirror. This mirror concentrated the light and reflected a beam of light to the eyepiece at the other end of the telescope. Because Newton used a mirror, his telescope was called a reflector
Very much larger optical telescopes can now be found in many parts of the world, built on hills and mountains far from city lights. The world’s largest refracting telescope is located at the Yerkes Observatory in Williams Bay, Wisconsin. Another telescope stands on Mount Palomar in California. This huge reflecting telescope was for many years the largest reflecting telescope in the world until an even larger reflecting telescope was built in the Caucasus Mountains. A fourth famous reflector telescope, the Keck Telescope situated on a mountain in Hawaii, does not use a single large mirror to collect the light. Instead, the Keck uses the combined light that falls on thirty- six mirrors
Radio telescopes, like optical telescopes allow astronomers to collect data from outer space, but they are different in important ways. First of all, they look very different because instead of light waves, they collect radio waves. Thus, in the place of lenses or mirror, radio telescopes employ bowl-shaped disks that resemble huge TV satellite dished. Also, apart from their distinctive appearance, radio telescope and optical telescopes use different methods to record the information they collect. Optical telescopes use cameras to take photographs of visible objects, while radio telescopes use radio receivers to record radio waves from distant object in space.What can be inferred about the first optical telescope?
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Buying a house is the single largest financial investment an individual makes. Yet, in India this act is fraught with risk and individuals depend on weak laws for justice. Occasionally, deviant promoters are called to account as was the case in the detention of Unitech’s promoters. This incident shows up the fallout of an absence of proper regulation to cover contracts between buyers and real estate promoters. A real estate bill, which is presently pending in Rajya Sabha, seeks to fill this gap. It has been debated for over two years and should be passed by Parliament in the budget session.
India is in the midst of rapid urbanization and urban population is expected to more than double to about 900 million over the next three decades. Unfortunately, even the current population does not have adequate housing. A government estimate in 2012 put the shortage at nearly 19 million units. If this shortage is to be alleviated quickly, India’s messy real estate sector needs reforms.
The real estate bill seeks to set standards for contracts between buyers and sellers. Transparency, a rare commodity in real estate, is enforced as promoters have to upload project details on the regulators’ website. Importantly, standard definitions of terms mean that buyers will not feel cheated after taking possession of a house. In order to protect buyers who pay upfront, a part of the money collected for a real estate project is ring-fenced in a separate bank account. Also, given the uncertainty which exists in India on land titles, the real estate bill provides title insurance. This bill has been scrutinized by two parliamentary committees and its passage now brooks no delay.
This bill is an important step in cleaning up the real estate market, but the journey should not end with it. State governments play a significant role in real estate and they are often the source of problems. Some estimates suggest that real estate developers have to seek approvals of as many as 40 central and state departments, which lead to delays and an escalation in the cost of houses. Sensibly, NDA government’s project to provide universal urban housing forces states to institute reforms to access central funding. Without real estate reforms at the level of states, it will not be possible to meet the ambition of making housing accessible for all urban dwellers.The word “fraught” in paragraph 1 is closest in meaning to .
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Reading to oneself is a modern activity which was almost unknown to the scholars of the classical and medieval worlds, while during the fifteenth century the term “reading” undoubtedly meant reading aloud. Only during the nineteenth century did silent reading become commonplace.
One should be wary, however, of assuming that silent reading came about simply because reading aloud was a distraction to others. Examinations of factors related to the historical development of silent reading have revealed that it became the usual mode of reading for most adults mainly because the tasks themselves changed in character.
The last century saw a steady gradual increase in literacy and thus in the number of readers. As the number of readers increases, the number of potential listeners decline and thus there was some reduction in the need to read aloud. As reading for the benefit of listeners grew less common, so came the flourishing of reading as a private activity in such public places as libraries, railway carriages and offices, where reading aloud would cause distraction to other readers.
Towards the end of the century, there was still considerable argument over whether books should be used for information or treated respectfully and over whether the reading of materials such as newspapers was in some mentally weakening. Indeed, this argument remains with us still in education. However, whatever its virtues, the old shared literacy culture had gone and was replaced by the printed mass media on the one hand and by books and periodicals for a specialized readership on the other.
By the end of the twentieth century, students were being recommended to adopt attitudes to books and to use reading skills which were inappropriate, if not impossible, for the oral reader.
The social, cultural and technological changes in the century had greatly altered what the term “reading” implied.The development of silent reading during the last century indicated
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National parks play a highly valuable role in documenting climate change. Researchers have utilized the vast tracts of pristine wilderness to collect data on species and habitats. At first, they collected observational data on foot; now, they use sophisticated methods such as aerial surveillance with drones like those used in Northrop Grumman’s Wildlife Challenge to collect information on polar bears.
Observational longitudinal data collection shows the effects of climate change that impact vegetation and animal species. The pika is the perfect example of an animal who may need to be relocated from the parks due to climate change, as described in Smithsonian Magazine. The park service is taking this very seriously. “It is … openly discussing the possibility of “assisted migration”: manually relocating some animals and plants if it turns out they can’t survive within the park’s changing landscapes.”
National park research also documents glacier retreat, finding that some ice fields have lost as much as 85 percent in the last five decades, according to U.S. Geological Survey. Glacier Park might be recognizable only as a historical name by 2030, it projects. It’s not just glaciers retreating. The Conversation notes that national park data shows that trees are also affected by climate change: “Climate change is killing trees due to increased drought, changes in wildfire patterns and increased bark beetle infestations. Tracking of trees in … national parks has contributed to a database that revealed how climate change has doubled tree mortality since 1955 across the western United States.”
We should not forget that at its inception, the National Parks Service’s long-term intention was to protect the parks and “leave them unimpaired for the enjoyment of future generations.”According to paragraph 3, in what way does climate change affect trees?