单选题下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。{{B}}第一篇{{/B}} The Best Way to Reduce Your Weight You hear this: "No Wonder you are fat. All you ever do is eat. " You feel sad: "I skip my breakfast and supper. I run every morning and evening. What else can I do?" Basically you can do nothing. Your genes, not your life habits, determine your weight and your body constantly tries to maintain it. Albert Stunkard of the University of Pennsylvania found from experiments that, "80 percent of the Children of two obese parents become obese, as compared with no more than 14 percent of the offspring of two parents of normal weight. " How can obese people become normal or even thin through dieting? Well, dieting can be effective, but the health costs are tremendous. Jules Hirsch, a research physician at Rockefeller University, did a study of eight fat people. They were given a liquid formula providing 600 calories (卡路里) a day. After more than 10 weeks, the subjects lost 45 kg on average. But after leaving the hospital, they all regained. The results were surprising: by metabolic measurement, fat people who lost large amounts of weight seemed like they were starving. They had psychiatric problems. They dreamed of food or breaking their diet. They were anxious and depressed (沮丧的) ; some were suicidal. They hid food in their rooms. Researchers warn that it is possible that weight reduction doesn't result in normal weight, but in an abnormal state resembling (类似) that of starved non-obese people. Thin people, however, suffer from the opposite: They have to make a great effort to gain weight. Ethan Sims, of the University of Vermont, got prisoners to volunteer to gain weight. In four to six months, they ate as much as they could. They succeeded in increasing their weight by 20 to 25 percent. But months after the study ended, they were back to normal weight and stayed there. This did not mean that people are completely without hope in controlling their weight. It means that those who tend to be fat will have to constantly battle their genetic inheritance if they want to significantly lower their weight. The findings also provide evidence for something scientists thought was true -- each person has a comfortable weight range. The range might be as much as 9 kg. Someone might weigh 60-69 kg without too much effort But going above of below the natural weight range is difficult. The body resists by feeling hungry or full and changing the metabolism to push the weight back to the range it seeks.

单选题 下面有3篇短文，每篇短文后有5道题，请根据短文内容，为每题确定1个最佳选项。{{B}}第一篇{{/B}} Motoring Technology 1.2 million road deaths worldwide occur each year, plus a further 50 million injuries. To reduce car crash rate, much research now is focused on safety and new fuels, though some electric vehicle and biofuel research aims at going faster. Traveling at speed has always been dangerous. One advanced area of research in motoring safety is the use of digital in-car assistants. They can ensure you don't miss important road signs or fall asleep. Most crashes result from human and not mechanical faults. Some safety developments aim to improve your vision. Radar can spot obstacles in fog, while other technology "sees through" big vehicles blocking your view. And improvements to seat belts, pedal (脚踏)controls and tires are making driving smoother and safer. The color of a car has been found to be linked with safety, as have, less surprisingly, size and shape. But whatever is in the fuel tank, you don't want a thief in the driving seat and there have been many innovations(创新). Satellite tracking and remote communications can also come into play if you crash, automatically calling for help. Accidents cause many traffic jams, but there are more subtle interplays between vehicles that can cause jams even on a clear but busy road. Such jams can be analyzed using statistical tools. Robotic drivers could be programmed to make traffic flow smoothly and will perhaps one day be everyone's personal chauffeur(司机) , but their latest efforts suggest that won't be soon.

单选题Red flag was placed there as a token of danger.

单选题China has made remarkable {{U}}achievements{{/U}} in its reform and opening-up program.

单选题The student is collecting material for his science report.A. dataB. fabricC. substanceD. supplies

单选题We all think the prices of the computers will soon plunge. A. leap B. fall C. dip D. sink

单选题That guy is intelligent but a bit dull. A．strange B．special C．quiet D．boring

单选题Loud noises can be irritating .

单选题Animals of the same kind always react in the same way to the danger of a quake.

单选题You have to be patient if you want to {{U}}sustain{{/U}} your position

单选题We should not sacrifice environmental protections to foster economic growth.

单选题 Spam Would you like to lose weight fast? Would you like to make $5,000 a month for your home? Yes or no, you are more likely to find such unsolicited offers flooding your E-mall inbox these days than ever before, along with a free trial for professional teeth whitening and a low-rate mortgage. Such E-mail, best known by its pejorative appellation, Spam, has been annoying Internet users for years. But in the last three months, Spam has been spiked. Spare-watchers attribute the escalation to a combination of factors. In a slumping economy, companies going out of business may be selling their lists of customer E-mail addresses to pay off creditors. Mailing tactics have also improved. Online marketers have always selected addresses from Web sites, but with the growth of sites like eBay, the online auction service where thousands of people post their E-mail addresses, automated sweeps of the World Wide Web for E-mail addresses are obtaining more results. Many now use "dictionary attacks," in which a computer automatically matches combinations of thousands of common, words and names with long lists of large domain names (amyfritz@ yahoo. com, amyfritz@ hotmail, com and so on) sends E-mail messages to all of them, much like telemarketers dialing numbers in sequence. As a result, even people who have made efforts to keep their E-mail addresses private are finding their mailboxes stuffed with suggestions on how to make money fast or reduce their debts simply and easily. Marketers worry that people who feel constantly assaulted by junk E-mail are less likely to trust any commercial communication by E-mails, even from businesses they might otherwise be happy to hear from, like a retailer alerting them to a sale on an item they are interested in. To shield themselves from junk E-mail, many Internet users have become increasingly wary of divulging their addresses. Some mainstream marketers are already beginning to see the effects of resistance to junk E-mail. Only a year ago, advertisers were raving about the response rates to targeted E-mail, which could reach as high as 20 percent. But that number is falling fast. Still, critics say some online retailers with well-known brand names also contribute to the problem by automatically adding customers to an E-mail list unless they specifically ask to be kept off. United Airlines, Amazon. com and Martha Stewart. com, among others, all require customers to uncheck the "yes" box on their Web site that asks if they would like to receive E-mail from them-or, in some cases, an unspecified list of advertising "partners". Some times, it is not entirely clear that there is a choice involved. The difficulty of defining Spare is one-reason efforts to pass federal legislation to stop it have foundered. Critics have compared junk E-mail to unsolicited faxes, which are illegal under a law that was passed when receiving a fax was quite expensive.

单选题An Intelligent Car Driving needs sharp eyes, keen ears, quick brain, and coordination between hands and the brain. Many human drivers have all (51) and can control a fast-moving car. But how does an intelligent car control itself? There is a virtual driver in the smart car. This virtual driver has "eyes," "brains", "hands" and "feet", too. The mini-cameras (52) each side of the car are his "eyes," which observe the road and conditions ahead of it. They watch the (53) to the car's left and right. There is also a highly (54) driving system in the car. It is the built-in computer, which is the virtual driver's "brain". His "brain" calculates the speeds of (55) moving cars near it and analyzes their positions. Basing on this information, it chooses the right (56) for the intelligent cars, and gives (57) to the "hands" and "feets" to act accordingly. In this way, the virtual driver controls his car. What is the virtual driver's best advantage? He reacts (58) . The mini-cameras are (59) images continuously to the "brain". It (60) the processing of the images within 100 milliseconds. However, the world's best driver (61) needs one second to react. (62) , when he takes action, he needs one more second. The virtual driver is really wonderful. He can reduce the accident (63) considerably on expressway. In this case, can we let him have the wheel at any time and in any place? Experts (64) that we cannot do that just yet. His ability to recognize things is still (65) . He can now only drive an intelligent car on expressways.

单选题Finding Enlightenment in Scotland In the 1740s, the famous French philosophy Voltaire said "We look to Scotland for all our ideas of civilization." That's not a bad advertisement for any country, especially when it comes to attracting people in search of a first class education. Yet some people go even further than that. According to the American author Arthur Herman, the Scots invented the modem world itself. He argues that Scottish thinkers and intellectuals worked out many of the most important ideas on which modem life depend everything from the scientific method to market economics. Their ideas did not just spread amongst intellectuals, but to those people in business, government and the sciences who actually shaped the Western world. It all started during the period that historians call the Scottish Enlightenment, which is usually seen as taking place between the years 1740 and 1800. At this time, Scotland was home to a number of thinkers who made an important shift in the course of Western philosophy. Before that, philosophy was mainly concerned with religion. For the thinkers of the Scottish Enlightenment, the proper study of humanity was mankind itself. Their reasoning was practical. For the philosopher David Hume, humanity was the right subject for philosophy because we can examine human behavior and so find real evidence of how people think and feel. And from that we can make judgments about the societies we live in and make concrete suggestions about how they can be improved, for universal benefit. Hume was not a scientist himself, but his enquiry into the nature of knowledge laid the foundations for the scientific method the pursuit of truth through experiment. His friend and fellow resident of Edinburgh, Adam Smith, famously applied the study of mankind to the ways in which mankind does business. Trade, he argued, was a form of information. Money is the way in which people tell each other what they want, and how much people pay is the best way we have of knowing how much somebody wants something. In pursuing our own interests through trading in markets, we all come to benefit each other. Smith's idea of "enlightened self-interest" has come to dominate modem views of economics. It also has wider applications. He was one of the first major philosophers to point out that nations can become rich, free and powerful more efficiently through peace, trade and invention than by means of war and plunder. The original Scottish Enlightenment is thought to have ended with the lives of Smith, Hume and the other thinkers who lived in Scotland at that time. But a wider Scottish Enlightenment can still be seen. It exists in the way that the ideas evolved at that time still underpin our theories. It also exists in Scotland itself in an educational tradition that combines academic excellence with practical orientation. The Institute for System Level Integration (ISLI) is a good example. Founded in 1998 by a group of four Scottish universities, ISLI draws on the academic expertise of the university departments of computer science, electronic and electrical engineering and informatics, But though it works at the cutting edge of science, ISLI's ultimate aims are rooted in the needs of the real world: to produce highly skilled design engineers and researchers to meet the needs of the rapidly changing global semiconductor industry. Though only one amongst many educational institutions in Scotland, ISLI's existence shows that the principles of the Scottish Enlightenment still live on. It's a country that's still inventing, still modernizing, and still doing its best to spread enlightenment.

单选题We are going to have the TV {{U}}fixed{{/U}}. A. prepared B. mended C. cleaned D. arranged

单选题Nowadays, we can {{U}}purchase{{/U}} things on-line.

单选题下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 {{B}}Solar Storm{{/B}} At the end of October 2003, a sudden solar storm hit the earth. A solar storm refers to the large amounts of charged particles released into space{{U}} (51) {{/U}}the solar energy increases. The release of the energy{{U}} (52) {{/U}}place along with the activity of the sunspots with a cycle of 11 years. This time, the{{U}} (53) {{/U}}of the storm exceeded expectations. This{{U}} (54) {{/U}}of intense solar storm was caused by the eruption of a solar flare (闪光) and the ejection (喷发) of the solar corona (日冠) on October 28, 2003. Large amounts of charged particles moved 150,000,000 kilometers through space toward the {{U}}(55) {{/U}}in 19 hours. They could affect aircraft roaming (漫游) in space. The high-energy particles will{{U}} (56) {{/U}}some of the parts of an aircraft. They may also cause it to fail. High-energy particles can threaten the safety of an aircraft at a high orbit. If an aircraft orbits at a lower orbit, it is{{U}} (57) {{/U}}because it is under the protection of the earth's magnetic field. A solar storm not only affects aircraft but also is a{{U}} (58) {{/U}}to the environment and humans. The aerosphere and magnetic field of the earth can {{U}}(59) {{/U}}humans from ultraviolet radiation and X-rays. While most of the X-rays are absorbed after they enter the aerosphere (大气层), still a few can{{U}} (60) {{/U}}the ground. The geomagnetic storm caused by this round of solar storm reaches its highest level on the two{{U}} (61) {{/U}}of the earth, which affects electricity supply of North America. Overexposure to{{U}} (62) {{/U}}threatens the health of passengers on planes flying over the Polar Regions. If we fly in the sky during such a solar storm, it{{U}} (63) {{/U}} we receive ten times the X-ray radiation. It's really damaging. Scientists say a solar eruption is like the sun sneezing, which will make the earth {{U}}(64) {{/U}}a cold. Though this natural force is irresistible, scientists can still {{U}}(65) {{/U}}its movement accurately by monitoring. Facing successive solar storms, humans can't drop their guard.

单选题The strong storm did lots of damage to this coastal village: several fishing boats are {{U}}destroyed{{/U}} and many houses are collapsed.

单选题The telephone system is no longer operative .