Rewrite the sentence:
Planting trees can contribute to reducing global warming.

 

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:
When another old cave is discovered in the south of France, it is not usually news.
Rather, it is an ordinary event. Such discoveries are so frequent these days that hardly anybody pays heed to them. However, when the Lascaux cave complex was discovered in 1940, the world was amazed. Painted directly on its walls were hundreds of scenes showing how people lived thousands of years ago. The scenes show people hunting animals, such as bison or wild cats.
Other images depict birds and, most noticeably, horses, which appear in more than 300 wall images, by far outnumbering all other animals.
Early artists drawing these animals accomplished a monumental and difficult task. “They” did not limit themselves to the easily accessible walls but carried their painting materials to spaces that required climbing steep walls or crawling into narrow passages in the Lascaux complex.
Unfortunately, the paintings have been exposed to the destructive action of water and temperature changes, which easily wear the images away. Because the Lascaux caves have many entrances, air movement has also damaged the images inside. Although they are not out in the open air, where natural light would have destroyed them long ago, many of the images have deteriorated and are barely recognizable. To prevent further damage, the site was closed to tourists in 1963, 23 years after it was discovered.

According to the passage, all of the following have caused damage to the paintings EXCEPT ………………...

Environmental Concerns

Earth is the only place we know of in the universe that can support human life. (1) ........ human activities are making the planet less fit to live on. The western world (2) ........ on consuming two-thirds of the world's resources while half of the world's population do so (3) ........ to stay alive. We are rapidly destroying the very resource we have by which all people can survive and prosper. Everywhere fertile soil is (4) ........ built on or washed into the sea. Renewable resources are exploited so much that they will never be able to recover completely. We discharge pollutants into the atmosphere without any thought of the consequences. As a (5) ........ the planet's ability to support people is being reduced at the very time when rising human numbers and consumption are (6) ........ increasingly heavy demands on it. The Earth's natural resources are there for us to use. We need food, water, air, energy, medicines, warmth, shelter and minerals to keep us fed, comfortable, healthy and (7) ……... If we are sensible in how we use the resources they will (8) ........ indefinitely. But if we use them wastefully and excessively they will soon run out and everyone will suffer.

(3) ........

Choose the word or phrase  A, B, C or D that best fits the blank space in the following passage:

"Face-to-face conversation is a two-way process: you speak to me, I reply to you and so on. Two-way (1)….. depends on having a coding System that is understood by both (2)….. and receiver, and an agreed convention about (3)…. the beginning and end of the (4)… . In speech, the coding System is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to (5)…. . In fact, the (6)…..that people use in conversations and meetings are often non- verbal. For example, lowering the pitch of voice may mean the end of a sentence; a Sharp intake of breath may signal the desire to (7)….. , catching the chairman’s (8)…. may indicate the desire to speak in a formal setting like a (9)….. , a clenched fist may indicate anger. When these (10)….. signals are not possible, more formal signals may be needed."

1. Two-way (1)….. depends on having a coding System

Each sentence has a mistake. Find it bychosing A B C or D

Although Yuri Gagarin first space flight lasted only 108 minutes, it gave encouragement to those who were interested in the future of manned space flight

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:
Thanks to electricity, candles are no longer a necessity in our lives, but they are still a pleasure. The warm flame of candlelight can quickly alter the mood and atmosphere of a room, often creating a  peaceful scene that electric light just cannot match.
Candles are an important part of many cultural and religious festival and have been burnt in various forms for centuries. The ancient Romans and Egyptians made candles from a type of fiber coated with wax. However, up until the nineteenth century, most candles were made from a substance called tallow, obtained from beef fat. Tallow candles were very smoky and, understandably, had an unpleasant odor.
In the 19th century, candle makers learned to separate stearin, the solid form fat used as a type of glue, from tallow and used it to harden other fats. Candles that contained stearin would burn longer than previous ones and had a better smell. Stearin is still one of the main components of modern candle- making, and the techniques used to create candles today are much the same as they have been for many years. These days, the increase range of wax dyes, perfumes and other additives that are now available make candle making a very exciting and rewarding hobby.
Sales of candles have increased greatly over the last few years, showing that they have become part of our lives again, not through necessity, but because of the magical atmosphere they create. In our increasingly stressful lives, the calming quality of candlelight has a relaxing effect that many enjoy.
For those would like to learn to make candles, finding and buying candle-making kits is easy. Candle- making is definitely enhanced by the exciting possibilities of experimentation with various materials. Be brave and try out different effects – some of the most wonderful creations can happen by accident. With a bit of practice, you will be amazed at the very professional finish that can be achieved.
Despite their delicate beauty, candles can, of course, be highly dangerous. One should never leave lit candles unattended, even for a few moments. Always make sure candles are securely placed within candleholders.
Teach your children to respect a burning candle, and of course keep burning candles away from flammable materials. Keep your home safe by remembering that a candle is magical, but fire can be very destructive. Be careful, and enjoy the beauty of your candles!

According to the text, what is needed to succeed at candle-making?

Read the following passage and choose the best answer (A, B, C, D):
The Sahara Desert is the world’s largest hot desert. The Sahara is in North Africa and is as large as the United States. Many people think that an area like this has no animals or plant life, but they are (1) __________. In fact, the Sahara Desert has many different ‘ecoregions’. Each ecoregion has different plants and animals (2)_________there. The biggest ecoregion is called the ‘Sahara Desert ecoregion.’ In this area, the climate is extremely dry and extremely hot. The landscape is sandy and dusty with many high dunes. Because the Sahara Desert ecoregion is so hot and dry, there are very few plants and animals. Scientists estimate that there are only 500 species of plants. This is not very much when thinking of (3)_________ enormous the region is. These plants include acacia trees, palms, spiny shrubs, and grasses. The Sahara is also home to 70 species of mammals. Twenty of these are large mammals. There are about 90 species of birds and around 100 reptiles. The biggest threat to plants and animals in this environment is drying (4)_______. Because of this, plants have the ability to recover their health after their leaves have dried out completely. Animals can lose 30-60% of their body mass and still survive. Most animals do not get their water from drinking like other ecosystems. Instead, they have adapted to get their water through metabolic processes. This is why they can survive in a place (5)______ the Sahara Desert ecosystem

Swine influenza (also called swine flu, hog flu and pig flu) is an infection of a host animal by any one of several specific types of microscopic organisms called "swine influenza virus". A swine influenza virus (SIV) is any strain of the influenza family of viruses that is usually hosted by (is endemic in) pigs. As of 2009, the known SIV strains are the influenza c virus and the subtypes of the influenza A virus known as HI N1, H1N2, H3N1, H3N2 and H2N3. Swine influenza is common in pigs in the mid-western United States (and occasionally in other states), Mexico, Canada, South America, Europe (including the UK, Sweden and Italy) Kenya Mainland China, Taiwan Japan and other parts of eastern Asia.

Transmission of swine influenza vims from pigs to humans is not common and does not always cause human influenza, often only resulting in the production of antibodies in the blood. The meat of the animal poses no risk of transmitting the virus when properly cooked. If transmission does cause human influenza, it is called zoonotic swine flu. People who work with pigs, especially people with intense exposures, are at increased risk of catching swine flu. In the mid-20th century, identification of influenza subtypes became possible. This allows accurate diagnosis of transmission to humans. Since then, fifty confirmed transmissions have been recorded. Rarely, these strains of swine flu can pass from human to human. In humans, the symptoms of swine flu are similar to those of influenza and of influenza-like illness in general namely chills fever sore throat, muscle pains severe headache, coughing, weakness and general discomfort.

The 2009 flu outbreak in humans known as "swine flu" is due to a new strain of influenza A virus subtype H1N1 that contains genes closely related to swine influenza. The origin of this new strain is unknown. However, the World Organization for Animal Health (OIE) reports that this strain has not been isolated in pigs. This strain can be transmitted from human to human, and causes the normal symptoms of influenza.

 Where is the swine influenza not common?

Read the following passage and choose the best answer (A, B, C, D):
Going to a restaurant shouldn’t be your excuse to eat unhealthy foods. Follow these tips and not only will you enjoy your meal more, you’ll feel satisfied and happy when you’re done. First, ask for it your way. Dining out is no time to be a meek consumer, notes Michael F. Jacobson, Ph.D., executive director of the Center for Science in the Public Interest (CSPI) and coauthor of the book Restaurant Confidential. “You need to be an assertive consumer by asking for changes on the menu,” he says. For instance, if an item is fried, ask for it grilled. If it comes with French fries, ask for a side of veggies instead. Ask for a smaller portion of the meat and a larger portion of the salad; for salad instead of coleslaw; baked potato instead of fried. “Just assume you can have the food prepared the way you want it,” says Dr. Jacobson. “Very often, the restaurant will cooperate.” Second, order A Salad before ordering anything else on the menu. Scientists at Pennsylvania State University found that volunteers who ate a big veggie salad before the main course ate fewer calories overall than those who didn’t have a first-course salad, notes Novick. However, remember: Salads Shouldn’t Be Fatty. This is a vegetable course-keep it tasty but healthy. That means avoiding anything in a creamy sauce (coleslaw, pasta salads, and potato salads), and skipping the bacon bits and fried noodles. Instead, load up on the raw vegetables, treat yourself to a few well-drained marinated vegetables (artichoke hearts, red peppers, or mushrooms), and for a change, add in some fruit or nuts. Indeed, fruits such as mango, kiwi, cantaloupe, and pear are often the secret ingredient in four-star salads.  
2. According to Dr. Jacobson, most restaurants _____________

Read the following passage and choose the best answer (A, B, C, D):
Saving the planet is very much in vogue. It’s also in Harper’s Bazaar, Elle and Mademoiselle. It’s the message on fashion runways, in marketing strategies, in jewelry and accessory designs, on shopping bags and totes, in advertisements and on price tags. A naked fashion model wearing a hat of birch branches and lichen, as shown in Vogue this month, may not be everyone’s idea of environmental awareness. But the pervasiveness of ecological themes in the images and marketing of fashion is undeniable. It is also somewhat paradoxical. The fashion industry, whose driving philosophy involves encouraging consumers to discard the old and embrace the new, is now trying to push itself to the forefront of efforts to conserve and preserve. The environmental theme in fashion began as wispy touches and graphic exhortations in designer collections, not as some well-thought-out strategy of “green” marketing in which the environmental advantages of a product become part of the sales approach. Tendrils of ivy dangled from the ceiling at a Paris fashion show; a carpet of grass covered a runway in New York; models marched along in T-shirts or carrying signs all bearing slogans like “Clean Up or Die,” “Save the Sphere,” and “Environmental Protection Agents”.  The environmental spin on fashion has now moved into the mass market, where ‘’clothes with conscience’‘ make an extra tug at the buyer’s self-image. Bonjour, a jeans and sportswear company based in New York, has embarked on a program to ’‘change the individual’s outlook toward saving the environment’’ through educational tags. This summer, the first wave of what Bonjour executives said would be 50 million fashion items a year are to arrive in stores carrying tags with environmental tips from how to save water to how to reduce pollutants. Whether these tributes to nature will benefit the environment or even raise environmental awareness, with concomitant changes in individual behavior, is not clear. There is some skepticism. Professor Ewen says the new environmental symbolism should be viewed as part of an overall change in America’s economy, from one built on industrial production of hard goods to one based on “pure representation”. “Going back to fashion, the environment has become a commercial cliche separated from real concerns. What can be attached to this year’s fashion is merely the symbolism of environmental sanity.” 
5. According to paragraph 4, what is the main focus of the current green fashion?

Read the following passage and choose the best answer (A, B, C, D):
Don’t look now, but artificial intelligence is watching you. Artificial intelligence has tremendous power to enhance spying, and both authoritarian governments and democracies are adopting the technology as a tool of political and social control. Data collected from apps and websites already help optimize ads and social feeds. The same data can also reveal someone’s personal life and political leanings to the authorities. The trend is advancing thanks to smartphones, smart cameras, and more advanced AI. An algorithm developed at Stanford in 2017 claimed to tell from a photograph whether a person is gay. Accurate or not, such a tool creates a new opportunity for persecution. “Take this type of technology, feed it to a citywide CCTV surveillance system, and go to a place like Saudi Arabia where being gay is considered a crime,” says Lisa Talia Moretti, a digital sociologist. “Suddenly you’re pulling people off the street and arresting them because you’re gay, because the computer said so.”  No country has embraced facial recognition and AI surveillance as keenly as China. The AI industry there has flourished thanks to fierce competition and unrivaled access to personal data, and the rise of AI is enabling tighter government control of information, speech, and freedoms. In some Chinese cities, facial recognition is used to catch criminals in surveillance footage, and to publicly shame those who commit minor offenses. Most troubling, AI is being used in Xinjiang, a province in Western China, to persecute Muslims. Even if China’s AI capabilities are exaggerated, the AI boom there is having a chilling effect on personal freedom, says Ian Bremmer, an expert on global political risk and founder of the Eurasia Group. “You just need a government that is starting to get that capacity and make it known, and have a few people that are sort of strung up as examples, and suddenly everyone is scared,” he says. This might feel like a distant reality, but similar tools are being developed and used in the West. Just ask Glenn Rodriguez, who faced judgment from an algorithm when seeking parole from prison in the US. Despite 10 years of good behavior, Rodriguez saw how an algorithm called COMPAS, designed to predict inmates’ likelihood of reoffending, would be biased against him. And even though the parole board went against the computer program’s  
6. According to paragraph 4, what can the AI system in the US do?

Read the following passage and choose the best answer (A, B, C, D):
Some experts fear that many people are becoming overweight. Adults are encouraged to exercise for a minimum of thirty minutes, five times a week, and the average person is (1) ____ to take 10,000 steps per day to maintain basic fitness, but it is a fact that few office workers manage to take more than 5,000.  Now architects have designed ‘fit’ office buildings which encourage employees to become healthier because they have to walk while they are at work. In these buildings, meeting rooms and car parks are placed a long way from office desks so that workers have to walk to (2) ____ them. In one building the cafe is located in the furthest section so that some workers have to walk as (3) ____ as half a kilometer to and from lunch. There is special emphasis on (4) ____ people to use stairs instead of lifts, and long staircases are broken into flights of no more than nine stairs, so that they don’t look so difficult to climb. There are also large windows which provide attractive views over the city. (9) ____, the lifts are not easy to get access to, and in some buildings, they only stop at one floor in three.  It’s a design policy for a fitter environment which encourages people to walk without making it appear to be hard work - but will it be successful? Only time will tell

Read the following passage and choose the best answer (A, B, C, D):
The term “generation gap” may have been coined not long ago but the problem itself is as old as the hills. All sorts of conflicts and misunderstanding between younger and older generations occur in probably every family. Adults complain about arrogance and insensitivity of young people whereas the latter claim that their parents have no idea about what they are going through. There seems to be no perfect solution to this problem as the young and the old find it difficult, if not impossible, to communicate and accept opposite views. The fact that teenagers develop different values from those held by their parents leads to numerous conflicts. There are many reasons why the problem of generation gap arises. First of all, the period of adolescence is difficult. Teenagers are not children any longer, but they are no adults yet. They search for a sense of identity and crave independence. On the other hand, they depend on their parents financially and still need their parent consent when they want to go out, go for holidays, buy something expensive, invite friends home, etc. Very often teenagers treat their parents like enemies especially when they are not permitted to do one thing or another. Obviously, it is understandable when parents insist a teenager returns home before midnight. They have a wide knowledge of the world and all kinds of risks involved – reckless youngsters see no danger in walking alone in the middle of the night or getting a lift from a stranger who might be a serial killer. When children grow up and start their own families they are able to admit that their parents were usually right, although a bit overprotective at times  However, we must remember that adolescence is the period of making important decisions. Sixteen or seventeen-year-olds want to choose their career path or at least develop their talents, which in turn will enable them to decide upon a job later on. Secondly, it is in their late teens when they form their lifelong friendships, go for their first dates, analyze what qualities they will look for in their future partners. Unfortunately, a lot of parents do not want to accept the fact that their child is growing up and has the sole right to choose who she or he wants to become in the future. Such mothers and fathers often have their own idea what their child’s life should be. To my mind, this kind of behavior is really harmful and it can result in a very serious family conflict. Every now and then we meet forty-year-old people who accuse their parents of making them study the subject they hated or marrying the person they never loved. The generation gap problem, which usually disappears a few years later, in such families turns into an emotional wound which might never heal and the feeling of a wasted life on both parts. To sum up, although conflicts between teenagers and their parents are unavoidable, they definitely do not have to lead to an open war. My advice to parents is to try and treat teenagers as their equal partners and to accept their ideas. Teenagers should respect their mothers and fathers more, and be always ready to discuss serious problems with them. All in all, who else loves them more than their parents do?  
7. According to paragraph 4, which of the following is NOT mentioned as the thing teenagers do during their adolescence?

Read the following passage and choose the best answer (A, B, C, D):
Light-emitting diodes (LEDs) are now considered the future of lighting due to a lower energy requirement to run, a lower monthly price tag, and a longer life than traditional incandescent light bulbs. Nick Holonyak, an American scientist at General Electric, accidently invented the red LED light while trying to create a laser in the early 1960s. As with other inventors, the principle that some semiconductors glowed when an electric current was applied had been known since the early 1900s, but Holonyak was the first to patent it for use as a light fixture. Within a few years, yellow and green LEDs were added to the mix and used in several applications including indicator lights, calculator displays, and traffic lights, according to the DOE. The blue LED was created in the early 1990s by Isamu Akasaki, Hiroshi Amano, and Shuji Nakamura, a group of Japanese and American scientists, and for which they won the 2014 Nobel Prize in Physics. The blue LED allowed scientists to create white LED light bulbs by coating the diodes with phosphor Today, lighting choices have expanded and people can choose different types of light bulbs, including compact fluorescent (CFL) bulbs work by heating a gas that produces ultraviolet light and LED bulbs. Several lighting companies are pushing the boundaries of what light bulbs can do, including Phillips and Stack. Phillips is one of several companies that have created wireless light bulbs that can be controlled via smartphone app. The Phillips Hue uses LED technology that can quickly be turned on or off or dimmed by a flick on a smart phone screen and can also be programmed. The higher-end Hue light bulbs can even be set to a large range of colors (only about sixteen million) and synced with music, movies, and video games. Stack, begun by engineers from Tesla and NASA, developed a smart light bulb using LED technology with a wide range of functions. It can automatically sense the ambient lighting and adjust as needed, it turns off and on via motion sensor when someone enters the room, can be used as a wake up alert, and even adjusts color throughout the day to fit with human’s natural circadian cycles and patterns of natural light. The light bulbs also have a built-in learning program that adapts to inputs given by residents over time. And all of these functions can be programmed or monitored from any smart phone or tablet. It is estimated that Stack smart light bulbs can use about sixty percent less energy than a typical LED light bulb and lasts between twenty and thirty thousand hours depending on the model . These light bulbs are compatible (or soon will be) with many of the options for turning an entire home into a smart home including usage with Amazon Alexa, Google Home, and Apple HomeKit.
4. The word “which” in paragraph 3 refers to _____

Read the following passage and choose the best answer (A, B, C, D):
Print media encompasses mass communication through printed material. It includes newspapers, magazines, booklets and brochures, house magazines, periodicals or newsletters, direct mailers, handbills or flyers, billboards, press releases, and books. Newspapers enjoyed the position of the most preferred medium to reach a wider audience until electronic communication emerged on the media scene. In the early days, newspapers were the only medium that masses at large depended on, for daily news. A newspaper carries all kinds of communication related to a variety of topics like politics, socialism, current affairs, entertainment, finance, stocks, etc. Apart from this, it also includes topics, which are in lighter vein like cartoons, movie reviews, book reviews, puzzles, crosswords, etc. This captivates the imagination and interests of readers from all age groups. Newspapers are an important platform of mass communication, as they reach every nook and corner of the world where electronic media fails to reach. It plays a pivotal role in providing authentic firsthand information, building opinions, updating the knowledge of the reader, and serves as a good platform for advertisers to promote their products. However, with the emergence of Internet, which updates information every second, and is just a click away, the popularity of newspapers has reduced. Magazines are another type of popular culture print media. They usually cater to a specific type of audience who are looking for information based on a particular subject. Magazines cover a plethora of topics, like current affairs, business, finance, consumers, gadgets, self-help, luxury, lifestyle, beauty, fashion, entertainment, travel, etc. Magazines like TIME and Reader’s Digest include information, which is all-pervasive. The frequency of magazines can be weekly, fortnightly, bi-monthly, quarterly, halfyearly, or yearly. These magazines are the best forum for advertisers, as they have a niche  readership. The readers look for a specific type of information, say for example, a camera ad in a Gadget magazine will definitely have a direct brand impact on the reader who wants to buy a camera. Also, the shelf life and brand recall of magazines is far better than newspapers, which have a short life span.  
5. According to the passage, compared with newspapers, magazines are _________

Read the following passage and choose the best answer (A, B, C, D):
Being part of a community with long history rooted in agriculture, Vietnamese people  especially those from older generations hold a strong belief for superstition about luck and bad luck. Even though people have become much less superstitious as they were before, some traditions still (1) ____ on until today like people’s habit. Let’s take a closer look at some common food-related superstitions and explore the reasoning behind them.  Regarding what food to avoid before taking an important examination, homophones and the shape of your food comes into (2) ____. These features are the criteria that people use to decide which food is good and what is bad to eat before an important examination. Students are restrained from eating bananas prior to an exam for (3) ____ of failing ‘like sliding on a banana skin’  They are also advised eating squid, which when disturbed, emit a substance that is ‘as black as ink’. The phrase carries the connotation of a black (bad) mark on your test. Eating squash, pumpkin, melon and peanuts was also a (4) ____. The words for pumpkin and melon in Vietnamese mean “stuck” and the word for peanut means to be ‘lost’ or ‘digress’. Duck meat and eggs are associated with bad luck since the shape of an egg resembles the zero number. On the (5) ____, eating any type of beans is considered good before an exam since bean in Vietnamese means the same thing with to ‘pass a test’

Read the following passage and choose the best answer (A, B, C, D):
Most sources of illumination generate light over an appreciable period, and indeed if  an object is lit for a very brief time(less that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic flash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoflash is now generated electronically, but the earliest form, first used in 1864, was a paper bag containing magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense flash. A contemporary observer reported that “this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”  The evolution of the photoflash was slow, flashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920’s. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The flash was fired by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen difluoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reflecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time. 
3. The word “ignited” in paragraph 1 is closest in meaning to __________

Choose the answer A, B, c or D to fill the blank space in the following passage.

"Speech is one of the most important ways of communicating. It consists of far more than just (1)….. noises. To talk or to (2)…. by other people, we have to master a language, that is, we have to use combinations of sound that (3)….. for a particular object or idea. Communication (4)…. impossible if everyone (5)….. up their own language.
Learning a language is very important. The basic vocabulary of English is not very large, and only about 2,000 words are needed to speak (6)…. quite well. But the more words you know, the more ideas you can express, and the more precise you can be (7)…. their meaning. Words are the main things we use (8)…. what we want to say. The way we say the words (9)…. also very important. One tone of voice can express (10)…. emotions and show whether we are pleased or angry for instance."

7. But the more words you know, the more ideas you can express, and the more precise you can be (7)…. their meaning. 

Rewrite the sentence:
I think you should stop smoking.=>

Read the following passage and choose the best answer (A, B, C, D):
According to the American Red Cross, there’s a 97% chance that someone you know will need a blood transfusion. Blood donors — especially donors with certain blood types — are always in demand. To donate blood, the American Red Cross requires that people be at least 17 years old and weigh more than 110 pounds. (In some states, the age is 16 with a parent’s permission.) Donors must be in good health and will be screened for certain medical conditions, such as anemia. Donors who meet these requirements can give blood every 56 days. Blood donation starts before you walk in the door of the blood bank. Eat a normal breakfast or lunch — this is not a good time to skip meals — but stay away from fatty foods like burgers or fries. And be sure to drink plenty of water, milk, or other liquids. Before donating, you’ll need to answer some questions about your medical history, and have your temperature, pulse, blood pressure, and blood count checked. The medical history includes questions that help blood bank staff decide if a person is healthy enough to donate blood. They’ll probably ask about any recent travel, infections, medicines, and health problems. Donated blood gets tested for viruses, including HIV (the virus that causes AIDS), hepatitis B, hepatitis C, syphilis, and West Nile virus. If any of these things are found, the blood is destroyed. Because blood can be infected with bacteria as well as viruses, certain blood components are tested for contamination with bacteria as well.  Are there any risks? A person can’t get an infection or disease from giving blood. The needles and other equipment used are sterile and they’re used only on one person and then thrown away. The U.S. Food and Drug Administration (FDA) regulates U.S. blood banks. All blood centers must pass regular inspections in order to keep operating. Sometimes people who donate blood notice a few minor side effects like nausea, lightheadedness, dizziness, or fainting, but these symptoms usually go away quickly. The donor’s body usually replaces the liquid part of blood (plasma) within 72 hours after giving blood. It generally takes about 4–8 weeks to regenerate the red blood cells lost during a blood donation. An iron-fortified diet plus daily iron tablets can help rebuild a donor’s red blood supply. The Red Cross estimates that 15% of all blood donors in the United States are high school or college students — an impressive number when you consider you have to be 16 or 17 to donate blood. If you are eligible and want to donate blood, contact your local blood bank or the American Red Cross for more information on what’s involved. You could save someone’s life.  
1. What is the purpose of the writer in the passage?

Each sentence has a mistake. Find it by chosing A B C or D

Nonverbal communication or body language is communication by facial expression, head or eye movements, hand signals, but body postures