填空题A. Harm Screening May Do to a Younger WomanB. Investing the Effect of ScreeningC. Effects Predicted by Two Different ModelsD. small Risk of Inducing Cancers from RadiationE. Treatment of CancersF. Factors That Trigger Cancers

填空题Semco At 21，Ricardo Semler became boss of his father's business in Brazil，Semco，which sold parts for ships．Semler Junior worked like a madman，from 7:30 a.m.，until midnight every day．One afternoon， while touring a factory in New York，he collapsed．The doctor who treated him said，“There's nothing wrong with you．But if you continue like this．you'll find a new home in our hospital．”Semler got the message．He changed the way he worked．In fact，he changed the way his employees worked too． He let his workers take more responsibility so that they would be the ones worrying when things went wrong．He allowed them to set their own salaries，and he cut all the jobs he thought were unnecessary，like receptionists and secretaries． (46) “Everyone at Semco．even top managers，meets guests in reception，does the photocopying，sends faxes，types letters and dials the phone．” He completely reorganized the office：instead of walls，they have plants at Semco，so bosses can't shut themselves away from everyone else． (47) As for uniforms，some people wear suits and others wear T-shirts． Semler says，“We have a sales manager named Rubin Agater who sits there reading the newspaper hour after hour．He doesn't even pretend to be busy．But when a Semco pump on the other side of the world fails and millions of gallons of oil are about to spill into the sea，Rubin springs into action． (48) That's when he earns his salary．No one cares if he doesn't look busy the rest of the time．” Semco has flexible working hours；the employees decide when they need to arrive at work．The employees also evaluate their bosses twice a year． (49) It sounds perfect，but does it work?The answer is in the numbers：in the last six years，Semco's revenues have gone from $35 million to $212 million．The company has grown from eight hundred employees to 3,000．Why? Semler says it's because of“peer pressure”．Peer pressure makes everyone work hard for everyone else． (50) In other words，Ricardo Semler treats his workers like adults and expects them to act like adults．And they do． A．Also，Semco lets its workers use the company's machines for their own projects，and makes them take holidays for at least thirty days a year． B．Most managers spend their time making it difficult for workers to work． C．This saved money and brought more equality to the company． D．And the workers are free to decorate their workspace as they want． E．He knows everything there is to know about our pumps and how to fix them． F．If someone isn't doing his job well，the other workers will not allow the situation to continue．

填空题阅读下面的短文，文章中有5处空白，文章后有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。 {{U}} (46) {{/U}}Your AAA computer also supports a second diskette drive that uses 5.25-inch diskettes, or 3.5-inch diskettes, depending upon the type of drive installed. There are two common types of disk drives: a hard disk drive (sometimes called a fixed disk drive) and a diskette drive (sometime called a floppy disk drive).{{U}} (47) {{/U}}(Some models might not have a hard disk drive. ) With a hard disk, your computer can store large amounts of information (called files) in one convenient place. Using a hard disk, your computer can save and retrieve information much faster than with a diskette drive.{{U}} (48) {{/U}}. Each disk drive has a letter assigned to it, so you can tell your computer where to find information.{{U}} (49) {{/U}}If you have a hard disk drive, it is called drive C. If your computer has a hard disk drive, drive C, then you can store your operating system and other programs on the hard disk.{{U}} (50) {{/U}}If your programs and information files (data files) are well organized, then your computer can find and retrieve the information much faster. Check your operating system documentation for information about how to set a directory. If your computer has no hard disk, then you must use the diskette drive to load your programs and to store your information. Your operating system and application program documentation have information about using disk disk drives and making program diskettes and data diskettes. A. For example, if your computer has two diskette drives, one is called drive A, the other is called drive B. B. The hard disk drive is built into your computer. C. The key to using your hard disk effectively is the way you store your information. D. The 5.25-inch diskette is thin and flexible. E. The AAA computer comes with a diskette that uses 3.5-inch diskettes. F. A diskette drive uses a removable diskette, which has less storage space than a hard disk.

填空题阅读下面的短文，文章中有5处空白，文章后有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。 {{B}}"Happy Birthday to You"{{/B}} The main problem in discussing American popular culture is also one of its main characteristics: it won't stay American. No matter what it is, whether it is films, food and fashion, music, casual sports or slang, it's soon at home elsewhere in the world. There are several theories why American popular culture has had this appeal. One theory is that it has been "advertised" and marketed through American films, popular music, and more recently, television.{{U}} (1) {{/U}}They are, after all, in competition with those produced by other countries. Another theory, probably a more common one, is that American popular 'culture is internationally associated with something called "the spirit of America."{{U}} (2) {{/U}} The final theory is less complex: American popular culture is popular because a lot of people in the world like it. Regardless of why it spreads, American popular culture is usually quite rapidly adopted and then adapted in many other countries.{{U}} (3) {{/U}}"Happpy Birthday to You," for instance, is such an everyday song that its source, its American copyright, so to. speak, is not remembered. Black leather jackets worn by many heroes in American movies could be found, a generation later, on all those young men who wanted to make this manly-look their own. Two areas where this continuing process is most clearly seen are clothing and music. Some people can still remember a time when T-shirts, jogging clothes, tennis shoes, denim jackets, and blue jeans were not common daily wear everywhere. Only twenty years ago, it was possible to spot an American in Pads by his or her clothes. No longer so: those bright colors, checkered jackets and trousers, hats and socks which were once marie fun of in cartoons are back again in Pads as the latest fashion.{{U}} (4) {{/U}} The situation with American popular music is more complex because in the beginning, when it was still clearly American, it was often strongly resisted. Jazz was once thought to be a great danger to youth and their morals, and was actually outlawed in several countries. Today, while still showing its rather American roots, it has become so well established. Rock 'n' roll and all its variations, country & western music, all have more or less similar histories. They were first resisted, often in American as well, as being "low-class," and then as % danger to our nation's youth."{{U}} (5) {{/U}}And then the music became accepted and was extended and developed, and exported back to the US. A. As a result, its American origins and roots are often quickly forgotten. B. But this theory fails to explain why American films, music, and television programs are so popular in themselves. C. American in origin, informal clothing has become the world's first truly universal style. D. The BBC, for example, banned rock and roll until 1962. E. American food has become popular around the world too. F. This spirit is variously described as being young and free, optimistic and confident, informal and disrespectful.

填空题Soot and Snow: a Hot Combination 1. New research from NASA scientists suggests emissions of black soot alter the way sunlight reflects off snow. According to a computer simulation, black soot may be responsible for 25 percent of observed global warming over the past century. 2. Soot in the higher latitudes of the Earth, where ice is more common, absorbs more of the sun"s energy and warmth than an icy, white background. Dark-colored black carbon, or soot, absorbs sunlight, while lighter colored ice reflects sunlight. 3. Soot in areas with snow and ice may play all important role in climate change. Also, if snow and ice covered areas begin melting, the warming effect increases, as the soot becomes more concentrated on the snow surface. "This provides a positive feedback, as glaciers and ice sheets melt, they tend to get even dirtier," said Dr. James Hansen, a researcher at NASA"s Goddard Institute for Space Studies, New York. 4. Hansen found soot"s effect on snow albedo (solar energy reflected back to space), which may be contributing to trends toward early springs in the Northern Hemisphere, such as thinning Arctic sea ice, melting glaciers and permafrost. Soot also is believed to play a role in changes in the atmosphere above the oceans and land. 5. "Black carbon reduces the amount of energy reflected by snow back into space, thus heating the snow surface more than if there were no black carbon," Hansen said. Soot"s increased absorption of solar energy is especially effective in warming the world"s climate. "This forcing is unusually effective, causing twine as much global warming as a carbon dioxide forcing of the same magnitude," Hansen noted. 6. Hansen cautioned, although the role of soot in altering global climate is substantial, it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century. Such gases are expected to be the largest climate forcing rest of this century. 7. The researchers found that observed warming in the Northern Hemisphere was large in the winter and spring at middle and high latitudes. These observations were consistent with the researchers" climate model simulations, which showed some of the largest warming effects occurred when there were heavy snow cover and sufficient sunlight.

填空题A．a necessity B．an emergency C．a number of new headaches D．family arguments E．big and light palm-sized models F．countless new facilities

填空题A．Star Is Born 1．The VLT (Very Large Telescope) is the world's largest telescope (望远镜) and is taking astronomers (天文学家) further back to the Big Bang than they ever thought possible. Located 2,600 metres up in the Chilean Andes, it has four huge mirrors, each about the size of a London bus. The VLT is so powerful it can spot a burning match 10,000 kilometres away. 2．This astonishing power will allow astronomers to see events in space from the birth of stars to the collision (碰撞) of galaxies (星系) on the edge of the cosmos (宇宙). The VLT is giving astronomers their best-ever view of the cosmos. The power of the VLT to see the smallest detail at the furthest distances makes its designers amazed. 3．Take the case of Eta Carinae, one of the most explosive stars in the universe. This star produces ultraviolet laser rays (紫外线) and it will destroy itself in a few million years' time. It is five times brighter than the sun and when it explodes it is going to be a sight worth waiting for! 4．But it is at distances of millions, even billions, of light years that the VLT really shows its power. The VLT can detect light that set out on its journey before the earth even existed. This gives astronomers their first-ever detailed views of events that took place in the earliest days of the cosmos. 5．In other words, the VLT is a kind of a time machine. It takes astronomers back to a time when complete galaxies crashed into each other. The effects of these past collisions can now be seen by scientists, and astronomers believe the telescope will reveal more about these exciting events in the years to come. One day, we might be able to say we have traveled back to the beginning of time, and we will have a much clearer picture of how our planet was born.

填空题Electromagnetic Energy 1. White light seems to be a combination of all colors. The energy that comes from a source of light is not limited to the kind of energy you can see. Heat is given off by a flame or an electric light. On a cloudy day it is possible to get a sunburn even though you feel cool. Visible light and the kinds of energy that produce warmth and sunburn are examples of electromagnetic energy. 2. The sun is 93 million miles from the earth. Yet we can use energy from the sun because electromagnetic energy travels through space. 3. Many other kinds of energy are also types of electromagnetic energy. Radio, television, and radar signals travel from transmitters to receivers as low-energy electromagnetic waves. Infrared (红外线的) radiation is an electromagnetic wave. When it is absorbed by matter, heat is produced. Waves of infrared and visible light have more energy than waves of radio, television, or radar. Ultraviolet rays (紫外线) and X-rays are electromagnetic waves with even greater amounts of energy. Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is useful in killing certain disease organisms. X-rays and gamma rays have so much energy that they travel through solid objects. They can be used to detect and treat cancer. X-rays are used in industry to find hidden cracks in metal, and in medicine to reveal broken bones. 4. Usually we use electricity to generate electromagnetic energy. The source of most of our energy is the sun. Heat from the sun causes water to evaporate. When the water falls to the earth as rain, some of it is trapped behind dams and then used to operate electric generators. Other generators are powered by coal, but the energy stored in coal came from the sun, too. 5. Until recently, the source of the tremendous amount of energy given off by the sun was a puzzle. If the sun depended on chemical reactions, it would have used up all its energy long ago. Experiments with electromagnetic radiation led to the theory that mass can be converted into energy. About forty years after the theory was proposed, nuclear energy was harnessed (利用) by man. Chemical energy comes from electron (电子) rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemical reactions, nuclear reactions release millions of times more energy per pound of fuel. We now believe that the sun"s energy comes from the nuclear reactions in which hydrogen is changed into helium (氦). 6. Nuclear energy is beginning to compete with coal as an economical source of power to generate electricity. It is also being used to operate engines in large ships. Scientists continue to seek new and better methods of obtaining and using energy.

填空题It is claimed that introducing robots is ______.

填空题Why Would They Falsely Confess? Why on earth would an innocent person falsely confess to committing a crime? To most people, it just doesn't seem logical. But it is logical, say experts, if you understand what can happen in a police interrogation (审讯) room. Under the right conditions, people's minds are susceptible (易受影响的) to influence, and the pressure put on suspects during police grillings (盘问) is enormous. (46) "The pressure is important to understand, because otherwise it's impossible to understand why someone would say he did something he didn't do. The answer is. to put an end to an uncomfortable situation that will continue until he does confess. " Developmental psychologist Allison Redlich recently conducted a laboratory study to determine how likely people are to confess to things they didn't do. (47) The researchers then intentionally crashed the computers and accused the participants of hitting the "alt" key to see if they would sign a statement falsely taking responsibility. Redlich's findings clearly demonstrate how easy it can be to get people to falsely confess: 59 percent of the young adults in the experiment immediately confessed. (48) Of the 15-to 16-year-olds, 72 percent signed confessions, as did 78 percent of the 12-to 13-year-olds. "There's no question that young people are more at risk, "says Saul Kassin, a psychology professor at Williams College, who has done similar studies with similar results. (49) Both Kassin and Redlich note that the entire "interrogation" in their experiments consisted of a simple accusation—not hours of aggressive questioning—and still, most participants falsely confessed. Because of the stress of a police interrogation, they conclude, suspects can become convinced that falsely confessing is the easiest way out of a bad situation. (50) A. In her experiment, participants were seated at computers and told not to hit the "alt" key, because doing so would crash the systems. B. "In some ways, "says Kassin, "false confession becomes a rational decision. " C. "It's a little like somebody's working on them with a dental (牙齿的) drill, "says Franklin Zimring, a law professor at the University of California at Berkeley. D. "But adults are highly vulnerable too. " E. How could an innocent person admit to doing something he didn't do? F. Redlich also found that the younger the participant, the more likely a false confession.

填空题Little Lady Starts Big War Harriet Beecher Stowe had poured her heart into her anti-slavery book "Uncle Tom"s Cabin" 1 The publisher was so doubtful that he wanted her to split the publishing costs with him, and all she hoped was that it would make enough money for her to buy a new silk dress. But when the first 5,000 copies were printed in 1852, they sold out in two days. In a year the book had sold 300,000 copies in the United States and 150,000 in England. 2 Within six months of its release, a play was made from the book which ran 350 performances in New York and remained America"s most popular play for 80 years. It might appear that "Uncle Tom"s Cabin" was universally popular, hut this was certainly not true. Many people during those pre-Civil War day—particularly defenders of the slavery system—condemned it as false propaganda and poorly written melodrama (传奇剧作品). Harriet did have strong religious views against slavery (When asked how she came to write the book, she replied: "God wrote it."), and She tried to convince people slavery was Wrong, so perhaps the book could be considered propaganda. 3 Though she was born in Connecticut in 1832, as a young woman she moved to Cincinnati, Ohio, when her father accepted the presidency of newly founded Lane Theological Seminary (神学院). Ohio was a free state, but just across the Ohio River in Kentucky, Harriet saw slavery in action. 4 In 1851, Harriet Beecher Stowe began her book. Its vast influence strengthened the anti-slavery movement and angered defenders of the slavery system. 5 In fact, when Abraham Lincoln met Harriet at the White House during the Civil War, he said," So, this is the little lady who started this big war." A. She had read a lot about the slavery system. B. Today some historians (历史学家) think that it helped bring on the American Civil War. C. But if so, it was true propaganda, because it accurately described the evils of slavery. D. For a while it outsold every book in the world, except The Bible . E. But neither she nor her first publisher thought it would be a big success. F. She lived 18 years in Cincinnati, marrying Calvin Stowe, professor of a college.

填空题A. occurs most infrequentlyB. is shifted sideways by strong windsC. is often hidden from our viewD. is equipped with a good knowledge of various forms of lightningE. is estimated at 20 millions a yearF. is positively charged

填空题Conservation or Wasted Effort? The black robin (黑旅鸫) is one of the world"s rarest birds. It is a small, wild bird, and it lives only on the island of Little Mangere, off the coast of New Zealand. In 1967 there were about fifty black robins there; in 1977 there were fewer than ten. 1 Energetic steps are being taken to preserve the black robin. 2 The idea is to buy another island nearby as a special home, a "reserve", for threatened wild life, including black robins. The organizers say that Little Mangere should then be restocked (重新准备) with the robin"s food. Thousands of the required plants are at present being cultivated in New Zealand. Is all this concern a waste of human effort? 3 Are we losing our sense of what is reasonable and what is unreasonable? In the earth"s long, long past hundreds of kinds of creatures have evolved, risen to a degree of success and died out. In the long, long future there will be many new and different forms of life. Those creatures that adapt themselves successfully to what the earth offers will survive for a long time. 4 This is nature"s proven method of operation. The rule of selection—"survival of the fittest"—is the one by which human beings have themselves arrived on the scene. We, being ode of the most adaptable creatures the earth has yet produced, may last longer than most. 5 You may take it as another rule that when, at last human beings show signs of dying out, no other creature will extend a paw (爪) to postpone our departure. On the contrary, we will be hurried out. Life seems to have grown too tough for black robins. I leave you to judge whether we should try to do anything about it. A. Some creatures, certain small animals, insects and birds, will almost certainly outlast (比……长久) man, for they seem even more adaptable. B. Those that fail to meet the challenges will disappear early. C. Detailed studies are going on, and a public appeal for money has been made. D. Both represent orders in the classification of life. E. Is it any business of ours whether the black robin survives or dies out? F. These are the only black robins left in the world.

填空题There are signs that psychiatrists, psychologists, social workers, and specialists on the family are becoming more aware of the part men play and that they have decided that women should not receive all the credit(信任)-not all the blame. We have almost given up saying that a woman's place is the home. ______ Nor is that place irrelevant to the healthy development of the child.A. We are beginning, however, to analyze men's place in the home and to insist that he does have a place in it.B. The family is a cooperative enterprise for which it is difficult to lay down rules, because each family needs to work out its own ways for solving its own problems.C. Excessive authoritarianism has unhappy consequences.D. It is time to reassess the role of the man in the American family.E. The ideal of equal rights and equal responsibilities is connected not only with a healthy democracy, but also with a healthy family.F. In such a home, the growing boy and girl learn to accept that equality more easily than did their parents and to prepare more fully for participation in a world characterized by cooperation rather than by the "battle of the sexes".

填空题Screen Test 1. Every year millions of women are screened with X-rays to pick up signs of breast cancer. If this happens early enough, the disease can often be treated successfully. According to a survey published last year, 21 countries have screening programmes. Nine of them, including Australia, Canada, the US and Spain, screen women under 50. 2. But the medical benefit of screening these younger women are controversial, partly because the radiation brings a small risk of inducing cancer. Also, younger women must be given higher doses of X-rays because their breast tissue is denser. 3. Researchers at the Polytechnic University of Valencia analysed the effect of screening more than 160,000 women at 11 local clinics. After estimating the women"s cumulative dose of radiation, they used two models to calculate the number of extra cancers this would cause. 4. The mathematical model recommended by Britain"s National Radiological Protection Board (NRPB. predicted that the screening programme would cause 36 cancers per 100,000 women, 18 of them fatal. The model preferred by the UN Scientific Committee on the Effects of Atomic Radiation led to a lower figure of 20 cancers. 5. The researchers argue that the level of radiation induced cancers is "not very significant" compared to the far larger number of cancers that are discovered and treated. The Valencia programme, they say, detects between 300 and 450 cases of breast cancer in every 100,000 women screened. 6. But they point out that the risk of women contracting cancer from radiation could be reduced by between 40 and 80 percent if screening began at 50 instead of 45, because they would be exposed to less radiation. The results of their study, they suggest, could help "optimise the technique" for breast cancer screening. 7. "There is a trade-off between the diagnostic benefits of breast screening and its risks." admits Michael Clark of the NRPB. But he warns that the study should be interpreted with caution. "On the basis of the current data, for every 10 cancers successfully detected and prevented there is a risk of causing one later in life. That"s why radiation exposure should be minimised in any screening programme." A．Harm Screening May Do to a Younger Woman B．Investigating the Effect of Screening C．Effects Predicted by Two Different Models D．Small Risk of Inducing Cancers from Radiation E．Treatment of Cancers F．Factors That Trigger Cancers

填空题Messages from the Media 1. The weather forecast, a story about the candidates in an election, and movie reviews are examples of messages from the media. A communication medium, of which the plural(复数的) form is media, is a means of communicating a message. Examples of media are television, radio, news-papers and books and the telephone. The media that can reach many people at once are called mass media. 2. It is not difficult to think of other messages we receive through the mass media. Every day we get hundreds of them. Think about advertisements, for example. We see and hear these messages almost everywhere we go. Advertisements are important messages, even though they are sometimes annoying. They help us compare and evaluate products. 3. Most of us get more information from the media than from the classroom. Think for a moment, about how you learn about local news and events. Do you depend on other people or the media? What about international news? What is the most important source of information for you? People who are asked this question usually answer, "Television". 4. Think of all the messages you received today. Perhaps you read a newspaper during breakfast, or maybe you read advertisements on billboards(露天广告牌) on your way to school. Did you listen to a weather forecast or the sports news on the radio this morning? Right now you are getting information through a very important medium of mass communication a book. 5. We use the information we get from radio, television, newspapers, and other media to make decisions and form opinions. That is why the mass media are so important. Editorials and articles in newspapers help us decide how to vote, consumer reports on television help us decide how to spend our money, and international news on the radio makes us think and form opinions about question of war and peace.

填空题A. Where do hurricanes usually happen? B. What damages can a hurricane cause? C. What should you do during a hurricane? D. What is a hurricane? E. What are different names of hurricanes? F. How do you know a hurricane is coming?

填空题That can be a good thing, with the Web serving as a kind of buffer zone (缓冲地带) for uncomfortable interaction. It's easier to face rejection, there aren't lulls in conversation or geographic boundaries-and social networking is like a window into the lives of potential mates. Say two people meet on Facebook, though a mutual friend, Immediately, they know whether the other person is single-without having to ask. ______ It's all the details a person might encounter on a first or second date, without ever having to go on one. As David Yams, a recent graduate of Babson College, outside Boston, trots it: "Facebook has taken the potentially awkward first stages of flirting and getting to know someone into the comfort of your own home."A. it's easier to approach each other, to talk casually, to get to know one another and feel out romantic potential without ever having to truly put themselves out there.B. "And you don't even have to be on the computer to engage in it."C. They can see where that person grew up, their political interests, whether they're "looking for a relationship" or only interested in "hooking up."D. As the thinking went, if you had to go to the Web to find a mate, or break up with one, it must have meant you weren't capable of attracting anyone in the real world.E. Now a relationship may still begin by locking eyes across a crowded bar, but instead of asking for a phone number, the next step almost surely involves a Facebook friendship offer.F. David Hein zinger, a 24-year-old new-media specialist in New York, recently asked a girl he met at a happy hour to dinner,

填空题Success Stories One of the most successful fashion companies in the world is Benetton. The Benetton family opened their first shop in Italy in 1968. (46) Benetton followed four marketing principles in order to achieve their success. The first principle is Consumer Concept. To build a successful business, you have to develop products around things people value, especially quality. (47) He created clothes to match people's wants: the style is casual; the colors and patterns are bold; and the quality is excellent. The System Link is another feature of good marketing. For Benetton, this means waiting to get information about what customers like and what they dislike before making the clothes. (48) The Information Link means making sure the company responds quickly to people's demands. (49) This information is then sent to the main office in Italy. Benetton can use this information to identify popular products and to continue making them; it can also identify less popular products and stop making them. A final important marketing principle is the Retail Link. There are Benentton stores in countries around the world. All the stores have the same clothing, the same window displays, and the same approach to sales. (50) The things people like about Benetton stores are that the quality is always high and the prices are generally low. And that spells success. A．The founder of Benetton began by asking people what they wanted. B．There used to be a good reason for this. C．When something is sold at a Benetton store, the store records information about the type, size, and color of the item. D．Today, there are Benetton shops in major cities all over the world. E．This means that customers can go into any Benetton store in the world and be sure of what they are buying. F．In other words, Benetton's clothes are made to order.

填空题Chimpanzees 1. Chimpanzees(黑猩猩)will soon be extinct(灭绝). If the present rate of hunting and habitat(栖息地)destruction continues, then within 20 years,there will be no chimpanzees living in the wild. But this is more than an environmental or moral tragedy(悲剧). Chimpanzee extinction may also have profound implications (含意)for the survival of their distant relatives -- human beings. 2. In 1975 the biologist Marie-Claire King and Allan Wilson discovered that the human and chimpanzee genomes(基因组)match by over 98%. Compare this to the mouse used as model for human disease in lab tests,which shares only 60% of its DNA with us. In fact, chimpanzees are far more similar to humans than they are to any other spectes of monkey. As well as resembling US genetically, chimps are highly intelligent and able to use tools. These facts alone should be enough to make protection of chimps an urgent priority(优先). But there is another,more selfish reason to preserve the chimp. 3. The chimpanzees'trump card(王牌)comes in the field of medical research. Chimpanzees are so similar to humans that veterinarians(兽医) often refer to human medical textbooks when treating them. Yet chimpanzees do show differences in several key areas. In particular, chimps are much more resistant to a number of major diseases. It is this ability that is so interesting. 4. For example,chimps seem to show a much higher resistance than humans to HIV,the virus that causes AIDS. Indeed, their use as experimental animals in AIDS research has declined because they are so resistant. 5. By sequencing the chimp genome and pinpointing(找到)the place where the chimpanzee DNA sequence differs from that of humans, scientists hope to be able to discover which part of the genetic code gives chimps their increased resistance to some diseases. This, they hope, will allow them to develop new and more effective treatments for the human forms of these diseases. Such treatments could include the production of new drugs or even the alteration(改变)of the human genetic sequence. The recently completed human genome sequencing project has shown that such an effort is now well within our reach. A. Genetic Differences Between Chimps and Humans B. Reasons for HIV Resistance C. Implications of Chimpanzee Extinction for Humans D. Effective AIDS Treatment E. Genetic Similarities Between Chimps and Humans F. Chimps' Resistance to HIV