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We ____ our classroom for the upcoming Teachers' Day, but there's still a lot to do.

 

Read the following passage and choose the best answer (A, B, C, D):
The “balance of nature” is not an empty phrase. Nature provides a population to  occupy a suitable environment and cuts down surplus on population to fit the available food supply. One means of reducing surplus population is predators; others are parasites and diseases. Also, population density produces nervous disorders and even drivers animals to mass migrations, like the lemmings of Norway who plunge into the sea.  That predator populations increase to control other animals has long been known. Many years ago, the Hudsons Bay Company records revealed that the fox population went up and down about a year after the rabbit population had gone up and down.  Sometimes a situation occurs in which the predator population is reduced to a level below that which nature can readily replace. On Valcour Island in Lake Champlain (New York), a costly campaign resulted in the elimination of predatory animals only to have birds and small animals (including grouse and hares, popular game) increase for four years afterward. Then, lacking predator control, nature resorted to disease to cut down on these populations.  Jamaica had an example of natures persistence in providing animals for existing habits. Sugar planters, about 75 years ago, imported mongooses to control rats. The mongooses killed off the rats and, with plentiful food, multiplied. Rats became scarce and the mongooses ate lambs, puppies, and wildlife. Eventually, food became scarce and the mongooses’ population declined.
5. It is implied in the passage that ____

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With exams approaching, you should be thinking about how to get better at time management and organize your days so you can strike the right balance between home, work and university life. You should also try and eat some brain food - and no, we don’t mean crisps and energy drinks! By taking the time to arrange your priorities, you can give yourself the best chance of staying on track and being organized during the exam period, which in turn can help reduce stress levels, something that can be the difference between success and failure at university. Take a look at our top time management tips, so that you can do your best at university and also find moments to relax and even earn some money on the side. First and foremost, allow time for planning to avoid repetition. Taking the time to research, plan and think about your work is crucial for good time management. Allow yourself the time to process new information and plan how you are going to use it, as this can help you to avoid having to re-read and repeat any research. One way of effectively planning before researching is to make a list of everything you want to find out, so that you can make notes below each subheading as you go Secondly, avoid procrastination and distraction. One way to avoid procrastination is to think about the different places you have been when studying - where were you the most focused? Where were you most distracted? Is there anything you can do to make studying actually somewhat enjoyable? Remember, what works for one person might not necessarily work for you. For some, studying with friends can limit their productivity. But for others, studying in groups can help to increase motivation and avoid procrastination. Next, exercise to clear your head in between study sessions. Believe it or not, exercise works in the same way sleep does. It can focus your state of mind, helping you to clear your head and boost your brain power in between study sessions. If you’re new to exercise, aim to fit in a 10-minute run here and there, steadily increasing the amount you do as you go on. Finally, ask yourself the question, “Has your organization been effective?” Constantly reviewing and reassessing your schedule can help you to recognize whether you need to make any changes in order to help you complete any university tasks and also have time to relax and spend time with friends and family.  
4. According to the passage, part of time management process is ____

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.
 Right now, the biggest source of energy in the world is fossil fuel. Fossil fuels are oil, gas, and coal. More than 80 percent of the world's energy comes from fossil fuel. There are many problems with fossil fuel. One problem is that when fossil fuel is burned, it pollutes the air. Also, when we take fossil fuel from the Earth, we often cause a lot of damage. Another problem is that we are running out of it. That is why we need new sources of energy. A big source of energy for many countries is nuclear power. Thirty-one countries use nuclear power. Many ships also use it.
 Nuclear power has some advantages. First of all, we can't run out of nuclear power. Nuclear power does not make the air dirty. Also, if a country has nuclear power, it doesn't need to buy as much as oil from other countries.
 However, there are also a lot of problems that come with nuclear power. For example, nuclear accidents are very serious. In 1986, there was a nuclear accident in Ukraine. In the next 20 years, about 4,000 people got sick and died. In 2011, there was another very serious nuclear accident in Japan. Japan is still trying to clean up the nuclear waste from the accident.
 Many people don't want nuclear power in their countries. They say that it is not safe. A lot of people want their countries to use safer and cleaner ways to get electricity. There have been protests against nuclear energy in the United States, Russia, France, Taiwan, Japan, India, and many other countries.
 Although many people hate nuclear energy, more and more countries are using it. One reason for this is that the world is using more and more energy. We just don't have enough fossil fuel. However, if we use nuclear power, then we may have more serious problems in the future.

Which of the following is NOT true about fossil fuel? 

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.

   Family life in the United States is changing. Thirty or forty years ago, the wife was called a "housewife". She cleaned, cooked, and cared for the children. The husband earned the money for the family. He was usually out working all day. He came home tired in the evening, so he did not do much housework. And he did not see the children very much, except on weekends.

   These days, however, more and more women work outside the home. They cannot stay with the children all day. They, too, come home tired in the evening. They do not want to spend the evening cooking dinner and cleaning up. They do not have time to clean the house and do the laundry. So who is going to do the housework now? Who is going to take care of the children?

   Many families solve the problem of housework by sharing it. In these families, the husband and wife agree to do different jobs around the house, or they take turns doing each job. For example, the husband always cooks dinner and the wife always does the laundry. Or the wife cooks dinner on some nights and the husband cooks dinner on other nights.

   Then there is a question of the children. In the past, many families got help with child care from grandparents. Now families usually do not live near their relatives. The grandparents often are too far away to help in a regular way. More often, parents have to pay for child care help. The help may be a babysister or a day-care center. The problem with this kind of help is the high cost. It is possible only for couples with jobs that pay well.

   Parents may get another kind of help from the companies they work for. Many companies now let people with children work part-time. That way, parents can spend more time with their children. Some husbands may even stop working for a while to stay with the children. For these men there is a new word: They are called "househusband". In the United States more ans more men are becoming househusband every year.

   These changes in the home mean changes in the family. Fathers can learn to understand their children better, and the children can get to know their fathers better. Husbands and wives may also find changes in their marriage. They, too, may have a better understanding of each other.

These changes in the Amercan home may ______________

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Clara Barton became known as “The Angel of the Battlefield” during the American Civial War. Born in Oxford, Massachusetts in 1821, Clara Barton’s interest in helping soldiers on the battlefield began when she was told army stories from her father. Another event that influenced her decision to help soldiers was an accident her brother had. His injuries were cared for by Barton for 2 years. At the time, she was only 11 years old. Barton began teaching school at the age of 15. She taught for 18 years before she moved to Washington, D.C. in 1854.
The civil war broke out 6 years later. Immediately, Barton started was service by helping the soldiers with their needs. At the battle of Bull Run, Clara Barton received permission from the government to take care of the sick and hurt. Barton did this with great empathy and kindness. She acknowledged each soldier as a person. Her endurance and courage on the

battlefield were admired by many. When the war ended in 1865, she used 4 years of her life to assist the government in searching for soldiers who were missing during the war.
The search for missing soldiers and years of hard work made her feeble physically. In 1869, her doctors recommended a trip to Europe for a rest. While she was on vacation, she became involved with the International Red Cross, an organization set up by the Geneva Convention in 1864. Clara Barton realized that the red Cross would be a big help to the United States. After she returned to the United States, she worked very hard to create an American red Cross. She talked to government leaders and let American people know about the Red Cross. In 1881, the Notional Society of the Red Cross was finally established with its headquarters in Washington, D.C. Clara Barton managed its activities for 23 years.
Barton never let her age stop her from helping people. At the age of 79, she helped flood victims in Galveston, Texas. Barton finally resigned from the Red Cross in 1904. She was 92 years old and had truly earned her titled “The Angel of the Battlefield”.

What can be the best title of the reading passage?

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"Did you see that?" Joe said to his friend Bill. "You're a great shooter!"
Bill caught the basketball and bounced it before throwing it again. The ball flew into the net. "Bill, you never miss!" Joe said admiringly.
"Unless I'm in a real game," Bill complained. "Then I miss all the time."
Joe knew that Bill was right. Bill performed much better when he was having fun with Joe in the school yard than he did when he was playing for the school team in front of a large crowd.
"Maybe you just need to practice more," Joe suggested.
"But I practice all the time with you!" Bill objected. He shook his head. "I just can't play well when people are watching me."
"You play well when I'm watching," Joe pointed out.
"That's because I've known you since we were five years old," Bill said with a smile. "I'm just not comfortable playing when other people are around."
Joe nodded and understood, but he also had an idea.
The next day Joe and Bill met in the school yard again to practice. After a few minutes, Joe excused himself.
"Practice without me," Joe said to his friend. "I'll be back in a minute."
Joe hurried through the school building, gathering together whomever he could find - two students, a math teacher, two secretaries, and a janitor. When Joe explained why he needed them, everyone was happy to help.
Joe reminded the group to stay quiet as they all went toward the school's basketball court. As Joe had hoped, Bill was still practicing basketball. He made five baskets in a row without noticing the silent people standing behind him.
"Hey, Bill!" Joe called out finally.
Bill turned. A look of surprise came over his face.
I just wanted to show you that you could play well with people watching you," Joe said. "Now you'll have nothing to worry about for the next game!"

At the end of the story, all of the following people watch Bill practice EXCEPT

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
In the course of its history, human inventions have dramatically increased the average amount of energy available for use per person. Primitive peoples in cold regions burned wood and animal dung to heat their caves, cook food, and drive off animals by fire. The first step toward the developing of more efficient fuels was taken when people discovered that they could use vegetable oils and animal fats in lieu of gathered or cut wood. Charcoal gave off more intensive heat than wood and was more easily obtainable than organic fats. The Greeks first began to use coal for metal smelting in the 4th century, but it did not come into extensive use until the Industrial Revolution.
In the 1700s, at the beginning of the Industrial Revolution, most energy used in the United States and other nations undergoing industrialization was obtained from perpetual and renewable sources, such as wood, water streams, domesticated animal labor, and wind. These were predominantly locally available supplies. By mid-1800s, 91 percent of all commercial energy consumed in the United States and European countries was obtained from wood. However, at he beginning of the 20th century, coal became a major energy source and replaced wood in industrializing countries. Although in most regions and climate zones wood was more readily accessible than coal, the latter represents a more concentrated source of energy. In 1910, natural gas and oil firmly replaced coal as the main source of fuel because they are lighter and, therefore, cheaper to transport. They burned more cleanly than coal and polluted less. Unlike coal, oil could be refined to manufacture liquid fuels for vehicles, a very important consideration in the early 1900s, when the automobile arrived on the scene.
By 1984, non-renewable fossil fuels, such as oil, coal, and natural gas, provided over 82 percent of the commercial and industrial energy used in the world. Small amounts of energy were derived from nuclear fission, and the remaining 16 percent came from burning direct perpetual and renewable fuels, such as biomass. Between 1700 and 1986, a large number of countries shifted from the use of energy from local sources to a centralized generation of hydropower and solar energy converted to electricity. The energy derived from non-renewable fossil fuels has been increasingly produced in one location and transported to another, as is the case with most automobile fuels. In countries with private, rather than public transportation, the age of non-renewable fuels has created a dependency on a finite resource that will have to be replaced.
Alternative fuel sources are numerous, and shale oil and hydrocarbons are just two examples. The extraction of shale oil from large deposits in Asian and European regions has proven to be labor consuming and costly. The resulting product is sulfur-and nitrogen-rich, and large scale extractions are presently prohibitive. Similarly, the extraction of hydrocarbons from tar sands in Alberta and Utah is complex. Semi-solid hydrocarbons cannot be easily separated from the sandstone and limestone that carry them, and modern technology is not sufficiently versatile for a large-scale removal of the material. However, both sources of fuel may eventually be needed as petroleum prices continue to rise and limitations in fossil fuel availability make alternative deposits more attractive.

The phrase “the latter” refers to

Choose the best answer:
Your friend stayed up late studying for an important exam.
"............"

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NASA is developing the capabilities needed to send humans to an asteroid by 2025 and Mars in the 2030s – goals outlined in the bipartisan NASA Authorization Act of 2010 and in the U.S. National Space Policy, also issued in 2010. Mars is a rich destination for scientific discovery and robotic and human exploration as we expand our presence into the solar system. Its formation and evolution are comparable to Earth, helping us learn more about our own planet’s history and future. Mars had conditions suitable for life in its past. Future exploration could uncover evidence of life, answering one of the fundamental mysteries of the cosmos: Does life exist beyond Earth? While robotic explorers have studied Mars for more than 40 years, NASA’s path for the human exploration of Mars begins in low-Earth orbit aboard the International Space Station. Astronauts on the orbiting laboratory are helping us prove many of the technologies and communications systems needed for human missions to deep space, including Mars. The space station also advances our understanding of how the body changes in space and how to protect astronaut health. Our next step is deep space, where NASA will send a robotic mission to capture and redirect an asteroid to orbit the moon. Astronauts aboard the Orion spacecraft will explore the asteroid in the 2020s, returning to Earth with samples. This experience in human spaceflight beyond low-Earth orbit will help NASA test new systems and capabilities, such as Solar Electric Propulsion, which we’ll need to send cargo as part of human missions to Mars. Beginning in FY 2018, NASA’s powerful Space Launch System rocket will enable these “proving ground” missions to test new capabilities. Human missions to Mars will rely on Orion and an evolved version of SLS that will be the most powerful launch vehicle ever flown. A fleet of robotic spacecraft and rovers already are on and around Mars, dramatically increasing our knowledge about the Red Planet and paving the way for future human explorers. The Mars Science Laboratory Curiosity Rover measured radiation on the way to Mars and is sending back radiation data from the surface. This data will help us plan how to protect the astronauts who will explore Mars. Future missions like the Mars 2020 rover, seeking signs of past life, also will demonstrate new technologies that could help astronauts survive on Mars. Engineers and scientists around the U.S. are working hard to develop the technologies astronauts will use to one day live and work on Mars, and safely return home from the next giant leap for humanity. NASA also is a leader in a Global Exploration Roadmap, working with international partners and the U.S. commercial space industry on a coordinated expansion of human presence into the solar system, with human missions to the surface of Mars as the driving goal.  
7. According to paragraph 5, what will help us plan how to protect the astronauts who will explore Mars?

Rewrite the sentence:
There isn't a culture of respecting and following the rule. The ASEAN community's present goal cannot be achieved.

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Ask about “the population problem” to people of a certain age, and the first and perhaps only thing that comes to mind is the “population bomb” or “population explosion.” And they would be right - for their time. In the second half of the 20th century, rapid population growth - especially but not exclusively in the developing countries - created unprecedented increases in the number of people on the earth. And this growth was accompanied by crowding, malnutrition, disease, and poverty. Indeed, for many Americans, the coming “population explosion” was, along with the Cold War, the most unsettling fact about our world. But “population problems” have been part of American discourse for over 100 years. In the 1930s and 1940s, for instance, many observers feared that depopulation due to plummeting birth rates would cause chronic economic depression as the numbers of U.S. consumers and workers declined. In the 1920s, the U.S. “population problem” was rapid urbanization, reflected in a 1920 census count showing that for the first time more than onehalf the population lived in urban areas. Rural incumbents in the House of Representatives, fearing they would be voted out of office by their new urban constituents, succeeded in blocking reapportionment of the House’s seats on the basis of the census counts as mandated by the U.S. Constitution. The century’s first “population problem” was mass xenophobia about immigration. Beginning in 1880, wave after wave of European immigrants was creating congestion and social change at an unprecedented rate. In response to widespread anxiety and anger, Congress in 1924 passed the country’s most restrictive immigration legislation ever. Each problem was based in hard numbers. Each generated private emotions and public fears. Each suffered exaggeration and manipulation. And each commanded the attention of opinion leaders and elected officials.  
2. According to paragraph 1, what did the author imply when writing “And they would be right - for their time”?

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The relationship between Britain and the US has always been a close one. Like all close relationship it has had difficult times. The US was first a British colony, but between 1775 and 1783 the US fought a war to become independent. The US fought the British again in the War of 1812. In general, however, the two countries have felt closer to each other than to any other country, and their foreign policies have shown this. During World War I and World War II, Britain and the US supported each other. When the US looks for foreign support, Britain is usually the first country to come forward and it is sometimes called “the 51st state of union”. But the special relationship that developed after 1945 is not explained only by shared political interests. An important reason for the friendship is that the people of the two countries are very similar. They share the same language and enjoy each other’s literature, films and television. Many Americans have British ancestors, or relatives still living in Britain. The US government and political system is based on Britain’s, and there are many Anglo-American businesses operating on both sides of the Atlantic. In Britain some people are worried about the extent of US influence, and there is some jealousy of its current power. The special relationship was strong in the early 1980s when Margaret Thatcher was Prime Minister in Britain and Ronald Reagan was President of the US.  
5. Britain and the US are close to each other NOT because of their ______

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If you want to spend your time effectively, you can try the following tips. First, make a to-do list every day. Put the most important tasks at the top, even if  they’re things you’re dreading, and tackle them first. Include things you want to do on your list too, so you have items you’re looking forward to. Try motivating yourself with a reward if you get to everything on your list.  Once you know what you need to do, keep your work with you. That way, if you find yourself with extra time – while in the train or bus or waiting for an appointment – you can get something done.  Additionally, don’t be afraid to say no. It’s OK to say no if your friend asks you to go to a movie one night but you have a test the next morning. Instead, find a time that works for both of you and go to see the movie then.  Managing your time also includes finding you productive time. Are you a morning person or a night person? You’ll be more efficient of you work when you’re at your best.  Last but not least, create a dedicated study time. Set up a time devoted only to studying or homework. Shut off you phone and respond to calls or texts when your work is finished. Don’t check email or surf the web (except when you need to for the work you’re doing) during this time either. 
3. According to the passage, dating with friends also means ___________________

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New data from the New York Fed highlights how the job situation for recent  graduates is worsening. While the rest of the labor market trends favorably, fresh graduates are more likely to be unemployed than the base U.S. working population. That has not happened before in the New York Fed data going back to 1990.  While the unemployment rate for all college graduates aged up to 65 is trending lower — currently near its lowest level of this current economic cycle — the market for recent college graduates is bucking the overall trend. With the backdrop of a robust U.S. labor market, this is “an important and worrisome trend to watch because it never dropped to prior cycle lows,” DataTrek’s Jessica Rabe wrote in a note. “Even though those who have graduated from college typically get hired before less educated workers.”  The rates are calculated as a 12-month moving average. Recent college graduates are defined as those between the ages of 22 and 27, with a bachelor’s degree or higher. The unemployment rate for recent college graduates has been inching upwards, from 3.8% in May to 4% in September. In contrast, the unemployment rate for overall workers was 3.6% in September.  Fresh graduates are having a hard time because of the lack of experience and relevant education, according to Brusuelas. “There’s some concern about the unemployment rate … [but] that may have more to do with the level of experience and difficulties in finding entry level work right now for the educated class.” Moody’s Analytics Chief Economist Mark Zandi previously told Yahoo Finance that the trend also “likely reflects in part greater caution by businesses given the slowing economy and uncertainty created by the trade war.” 
1.  Which best serves as the title for the passage?

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Orbis is an organization which helps blind people of everywhere. It has built an eye  hospital inside an airplane and (1)___________ it all over the world with an international medical team. Samantha Graham, a fourteen-year-old schoolgirl from England, went with the plane to Mongolia. Samantha tells the story of the Eukhtuul, a young Mongolian girl.  ‘Last year, when Eukhtuul was walking home from school, she was attacked by boys with sticks and her eyes were (2) _________ damaged. Dr. Duffey, an Orbis doctor, said that without an operation she would never see again. I thought about all the things I (3)________ that she couldn’t, things like reading schoolbooks, watching television, seeing friends, and I realized how lucky I am.’  ‘The Orbis team agreed to operate (4) ________ Eukhtuul and I was allowed to watch, together with some Mongolian medical students. I prayed the operation would be successful. The next day I waited nervously with Eukhtuul while Dr. Duffey removed her bandages. “In six months your sight will be back to (5)__________,” he said. Eukhtuul smiled, her mother cried, and I had to wipe away some tears, too!’  Now Eukhtuul wants to study hard to become a doctor. Her whole future has changed thanks to a simple operation. We should all think more about how much our sight means to us

Choose the best answer:
That old cottage is __________ need of reconstruction.

Find mistake:
Do they play any other sports beside basketball and volleyball?

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
The human criterionfor 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 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 millimetre in its retina. And in water, humans are farsighted, while the kingfisher, swooping down to spear fish, can see well both in the air and water because it is endowed with two foveae – areas of the eyes, consisting mostly of cones that provide visual distinctions. One foveae 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 foveae 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 moving 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 mammals, only humans and some primates can enjoy pleasures of colour vision.

The phrase “without a hitch” is closet in meaning to     .

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Jupiter is the largest and most massive planet and is fifth in order of distance from the sun. It is well placed for observation for several months in every year and on average is the brightest of the planets apart from Venus, though for relatively brief periods Mars may outshine it. Jupiter’s less than 10 hour rotation period gives it the shortest day in the solar system in so far as the principal planets are concerned. There are no true seasons on Jupiter because the axial inclination to the perpendicular of the orbital plane is only just over 3°-less than that for any other planet. The most famous mark on Jupiter is the Great Red Spot. It has shown variations in both intensity and color, and at times it has been invisible, but it always returns after a few years. At its greatest extent it may be 40,000 kilometers long and 14,000 kilometers wide, so its surface area is greater than that of Earth. Though the latitude of the Red Spot varies little, it drifts about in longitude. Over the past century the total longitudinal drift has amounted to approximately 1200°. The latitude is generally very close to – 22°. It was once thought that the Red Spot might be a solid or semisolid body floating in Jupiter’s outer gas. However, the Pioneer and Voyager results have refuted that idea and proven the Red Spot to be a phenomenon of Jovian meteorology. Its longevity may well due to its exceptional size, but there are signs that it is decreasing in size, and it may not be permanent. Several smaller red spots have been seen occasionally but have not lasted.
1. It can be inferred from the passage: 

Read the following passage and choose the best answer (A, B, C, D):
Jupiter is the largest and most massive planet and is fifth in order of distance from the sun. It is well placed for observation for several months in every year and on average is the brightest of the planets apart from Venus, though for relatively brief periods Mars may outshine it. Jupiter’s less than 10 hour rotation period gives it the shortest day in the solar system in so far as the principal planets are concerned. There are no true seasons on Jupiter because the axial inclination to the perpendicular of the orbital plane is only just over 3°-less than that for any other planet. The most famous mark on Jupiter is the Great Red Spot. It has shown variations in both intensity and color, and at times it has been invisible, but it always returns after a few years. At its greatest extent it may be 40,000 kilometers long and 14,000 kilometers wide, so its surface area is greater than that of Earth. Though the latitude of the Red Spot varies little, it drifts about in longitude. Over the past century the total longitudinal drift has amounted to approximately 1200°. The latitude is generally very close to – 22°. It was once thought that the Red Spot might be a solid or semisolid body floating in Jupiter’s outer gas. However, the Pioneer and Voyager results have refuted that idea and proven the Red Spot to be a phenomenon of Jovian meteorology. Its longevity may well due to its exceptional size, but there are signs that it is decreasing in size, and it may not be permanent. Several smaller red spots have been seen occasionally but have not lasted.
6. According to the passge, which of the following is NOT true?