单选题下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 Plants in Desert Only special plants can survive the terrible climate of a desert, for these are regions where the annual range of the soil temperature can be over 75℃. Furthermore, during the summer there are few clouds in the sky to protect plants from the sun's ray. Another problem is the fact that there are frequently strong winds which drive small, sharp particles of sand into the plants, tearing and damaging them. The most difficult problem for all forms of plant life, however, is the fact that the entire annual rainfall occurs during a few days or weeks in spring. Grasses and flowers in desert survive from one year to the next by existing through the long, hot, dry season in the form of seeds. These seeds remain inactive unless the right amount of rain falls. If no rain falls, or if insufficient rain falls, they wait until the next year, or even still the next. Another factor that helps these plants to survive is the fact that their life cycles are short. By the time that the water from the spring rains disappears—just a few weeks after it falls—such plants no longer need any. The perennials have special features which enable them to survive as plants for several years. Thus, nearly all desert perennials have extensive root systems below ground and a small shoot system above ground. The large root network enables the plant to absorb as much water as possible in a short time. The small shoot system, on the other hand, considerably limits water loss by evaporation. Another feature of many desert perennials is that after the rainy season they lose their leaves in preparation for the long, dry season, just as trees in wetter climates lose theirs in preparation for the winter. This reduces their water loss by evaporation during the dry season. Then, in next rainy season, they come fully alive once more, and grow new branches, leaves and flowers, just as the grasses and flowers in desert do.

单选题 Listening to Birdsong A male zebra finch chirps away to himself. Suddenly he notices a female bird nearby. He realizes he has an audience and immediately changes his song. Can the female tell the difference in his performance? According to a new study, the female zebra finch knows. And she prefers the special trills he creates when he sings to her. A male zebra finch changes his song when singing to a female in ways that people can barely detect. But the female finch can tell the difference. Scientists had noticed slight variations in the songs of male zebra finches based on whether they were singing alone or whether there was a female (and potential mate) nearby. With an audience, the males sped up the pace of their songs and controlled the notes they used. For this study, researchers Sarah C. Woolley and Allison Doupe at the University of California, San Francisco decided to focus attention on the listening females, which have not been well studied in the past. In the study, Woolley and Doupe set up a long cage with a sound speaker at each end. One broadcast the sound of a male zebra finch singing to himself, like someone singing in the shower. The other speaker broadcast a male performing for a female audience, as if he was giving a concert. Female birds were placed between the two speakers. Some of the birds had mates. Others didn't. The females shifted around a bit, and then most of them hopped over to sit beside just one speaker. All the birds that made a clear choice liked songs meant for a female audience, even if they'd never met the male. Mated females also had a chance to listen to two different performances songs, one from an unknown male, and one from their mate. They spent more time listening to the concert version of their mates' songs. This suggests that after a while, females learn to recognize—and prefer—the songs of their mates. Scientists then studied the brains of the females. They found certain areas of the brain perked up when the birds listened to the concert songs. These brains areas may be involved in recognizing and evaluating the songs, and storing the memories of them. This research deals with what's called directed communication, when the communicator or sender, focuses the message for a specific audience. One example is the way moms speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter, and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication, in this case their songs.

单选题 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 {{B}}International Trade{{/B}} Since the end of World War II, international trade has developed dramatically. All countries in the modern world join in worldwide trade, through which various sorts of merchandise and {{U}}(51) {{/U}} materials arc exported in {{U}}(52) {{/U}} for foreign currency, which means income wealth from {{U}}(53) {{/U}} and job opportunity at home, and in the meantime, foreign goods are imported to provide consumers with {{U}}(54) {{/U}} and welcome merchandise. Today, economic interdependence among countries is so {{U}}(55) {{/U}} that no country can close its doors to the outside world, and the more prosperous the national economy, the more developed the foreign trade. Economic globalization is now a {{U}}(56) {{/U}} in the world. But in the past when old and new colonialism ruled the world there was no free and fair trade at all. Powers, {{U}}(57) {{/U}} the British empire, the United States, Russia, Japan, divided the world into their spheres of influence—their colonies or dependencies, where their businessmen {{U}}(58) {{/U}} their merchandise at high prices and bought {{U}}(59) {{/U}} raw materials and labor at low prices. {{U}}(60) {{/U}} of wealth flowed to these powers which then grew prosperous, {{U}}(61) {{/U}} the colonies were driven into destitution (贫困). The national economy of colonies was innately defective. Their industries could not survive the overwhelming {{U}}(62) {{/U}} of imports from the powers. Their monotonous national economy {{U}}(63) {{/U}} in production of one or two agricultural crops or {{U}}(64) {{/U}} products or minerals, to be sold in international market, for example, orange and sugarcane in Cuba, banana and coffee in South-America, coal in Poland, all {{U}}(65) {{/U}} to supply-demand relation in world market under control of the powers. Even their customs were governed by officials from the powers, whose exported goods thus could enter the colonies nearly duty-free. It was after the collapse of colonialist system all over the world that free and fair international trade, at least theoretically, could be possible.

单选题The doctors did not {{U}}reveal{{/U}} the truth to him.

单选题The future will probably belong to those who possess and know how to make use of information.

单选题Jack consumes a pound of cheese a day. A. eats B. drinks C. buys D. produces

单选题The fuel tanks had a {{U}}capacity{{/U}} of 140 liters.

单选题A notably short man, he plays basketball with his staff several times a week. A．practically B．considerably C．remarkably D．completely

单选题阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。 Norwich Norwich, the capital of the part of Britain known as East Anglia, has been in existence for more than two thousand years. It began as a small village beside the River Wensum. At the time of the Norman invasion in 1066 it had grown to become one of the largest towns in England. With two cathedrals and a mosque(清真寺), Norwich has long been a popular centre for various religions. The first cathedral was built in 1095 and has recently celebrated its 900th anniversary, while Norwich itself had a year of celebration in 1994 to mark the 800th anniversary of the city receiving a Royal Charter. This allowed it to be called a city and to govern it-self independently. Today, in comparison with places like London or Manchester, Norwich is quite small, with a population of around 150,000, but in the 16th century Norwich was the second largest city of England. It continued to grow for the next 300 years and got richer and richer, becoming famous for having as many churches as there are weeks in the year and as many pubs as their are days in the year. Nowadays, there are far fewer churches and pubs, but in 1964 the University of East Anglia was built in Norwich. With its fast-growing student population and its success as a modern commercial centre (Norwich is the biggest centre for insurance services outside London), the city now has a side choice of entertainment: theatres, cinemas, nightclubs,busy cafes,exeellent restaurants, and a number of arts and leisure centres. There is also a football team, whose colours are green and yellow. The team is known as "The Canaries (金丝雀)",though nobody can be sure why. Now the city's attractions include another important development, a modern shopping centre called "The Castle Mall". The people of Norwich lived with a very large hold in the middle of their city for over two years, as builders dug up the main car park. Lorries moved nearly a million tons of earth so that the roof of the mall could become a city centre park, with attractive water pools and hundreds of trees, but the local people are really pleased that the old open market remains, right in the heart of the city and next to the new development. Both areas continue to do good business, proving that Norwich has managed to mix the best of the oId and the new.

单选题About one quarter of the workers in the country are employed in factories.

单选题China to Help Europe Develop GPS Rival China is to contribute to a new global satellite navigation system being developed by European nations. The Galileo satellite system (51) a more accurate civilian alternative to the Global Positioning System (GPS), operated by the US military, China will provide 230m Euros (USD 259m) in (52) and will cooperate with technical, manufacturing and market development. "China will help Galileo to (53) the major world infrastructure for the growing market for location services," said Loyola de Palacio, EU transport commissioner. A new center that will coordinate co-operation was also announced (54) the European Commission, the European Space Agency (ESA and the Chinese Ministry of Science and Technology not long (55) . The China-Europe Global Navigation Satellite System Technical Training and Cooperation Center will be (56) at Beijing University. China has a substantial satellite launch industry and could potentially help launch the Galileo satellites. The US has claimed that Galileo could interfere (57) the US ability to downgrade the GPS service during military conflicts. European officials say this is unfounded and counter that US opposition (58) the commercial challenge Galileo would present to GPS. Galileo will be precise to within meter, while the civilian GPS service is accurate to around 10 meters. The Galileo satellite constellation will (59) 27 operational and three reserve satellites orbiting the Earth at an altitude of 23,600 km. The satellites will be strung along three medium-Earth orbits at 56 degrees inclination to the equator and will provide global coverage. The system should be operational by 2008 and the entire project is expected to (60) around 3.2 billion euros (USD 3.6 billion) the European Commission has said Galileo will primarily be used for transportation technology, scientific research, land management and disaster monitoring. Galileo will provide two signals: a standard civilian one and an encrypted, wide-band signal (61) the Public Regulated Service (PRS). This second signal is designed to withstand localized jamming and will be used by police and military services in Europe. European Commission (62) have said China will not be given access to the PRS. The first Galileo satellite is scheduled to launch late in 2004. Clocks on board (63) will be synchronized through 20 ground sensors stations, two command centers and 15 uplink stations. Receivers on the ground will use time signals from the satellites to precisely calculate their (64) . A "search and rescue" function will also (65) distress signals be relayed through the constellation of satellites.

单选题Designers generally have the area Uconstructed/U so that the waste goes out in stages.

单选题{{B}}第三篇{{/B}} {{B}}Computers in Cars{{/B}} You're far from home on a lonely road. Shadowy forests stretch away on both sides. A thick mist (雾) makes it difficult to see far beyond your car's windshield (挡风玻璃). "Can this be route 90A?" you wonder. If it is, you should be near a town. Yet there's no hint of one. Night is closing in, and you're low on gasoline. This is a situation where an in-car computer that can navigate would be a big help. A car computer that navigates? Yes! Such computers exists. Several experimental models are being tested by General Motors, Ford, Chrysler, and several foreign car markets. These computers vary in details. But they all contain series of maps on Vediodiscs or videotapes. For example, one computer system contains 13,300 maps covering the continental US. Before starting out on a trip, a driver can type in the code for the region he or she plans to drive through. The computer then shows a map of that region. At the same time, a tiny radio receiver linked to the computer goes to work. It picks up signals from navigation satellites such as the NAVSTAR network. Using these signals, the computer shows a the car's position at all times and displays this position on the map. The computer can also calculate and display the best route to follow. A navigation computer may also receive and use data about road construction, weather conditions, and traffic jams. This information would be displayed to the driver and the computer would also use the information to work out alternate (交替的) routes. Most cars nowadays also contain computers that help cars run more effic!ently. Microprocessors (微处理机的) control certain engine functions by regulating the mixing of fuel. Data on car speed, oil pressure, revolutions per minute, engine temperature, and fuel level' can be displayed as digital data (numbers) or warming lights. Some auto designers suggest that a central computer display can be used to clearly present such timely information as car speed and fuel level. Warning lights would indicate a drop in oil pressure or a sudden rise in engine temperature. To get more information on these conditions, the driver would call it up on the computer display screen. When needed, the computer could be "asked" to provide navigation aid or information about the car's condition.

单选题It is hard for me to give you a {{U}}definite{{/U}} answer.

单选题A beautiful woman attended to me in that store yesterday.A. waited onB. talked toC. spoke toD. stayed With

单选题 Pushbike Danger Low speed bicycle crashes can badly injure -- or even kill -- children if they fall onto the ends of the handlebars (车把). So a team of engineers is redesigning it to make it safer. Kristy Arbogast, a bioengineer at the Children's Hospital of Philadelphia in Pennsylvania, began the project with her colleagues. The cases they reviewed about serious abdominal (腹部的) injuries in children in the past 30 years showed that more than a third were caused by bicycle accidents, "The task was to identify how the injuries occurred and come up with some countermeasures," she says. By interviewing the children and their parents, Arbogast and her team were able to reconstruct many of the accidents and identified a common cause for serious injuries. They discovered that most cases occur when children hit an obstacle at slow speed, causing them to topple (摇摆) over. To maintain their balance the children turn the handlebars through 90 degrees -- but their momentum (冲力) forces them into the end of the handlebars. The bike then falls over and the other end of the handlebars hits the ground, pushing it into their abdomen (腹部). The solution the group came up with is a handgrip (握柄) fitted with a spring and damping (减速) system. The spring absorbs up to 50 per cent of the forces transmitted (传递) through the handlebars in an impact. The group hopes to commercialize the device, which should add only a few dollars to the cost of a bike. "But our task has been one of education because up until now, bicycle manufacturers were unaware of the problem," says Arbogast.

单选题Her sister urged her to apply for the job.

单选题Alice trusts you, only you can persuade her to give up the foolish idea.

单选题The future {{U}}survival{{/U}} of the bald eagle is still an important American ecological concern.

单选题Some Things We Know about Language Many things about language are a mystery, and many will always remain so. But some things we do know. First, we know that all human beings have a language of some sort. There is no race (种族) of men anywhere on earth so backward that it has no language, no set of speech sounds by which the people communicate with one another. Furthermore, in historical times, there has never been a race of men without a language. Second, there is no such thing as a primitive (原始的) language. There are many people whose cultures are undeveloped, who are, as we say, uncivilized, but the languages they speak are not primitive. In all known languages we can see complexities that must have been tens of thousands of years in developing. This has not always been well understood; indeed, the direct contrary has often been stated. Popular ideas of the language of the American Indians will illustrate. Many people have supposed that the Indians communicated in a very primitive system of noises. Study has proved this to be nonsense. There are, or were, hundreds of American Indian languages, and all of them turn out to be very complicated and very old. They are certainly different from the languages that most of us are familiar with, but they are no more primitive than English and Greek. A third thing we know about language is that all languages are perfectly adequate. That is, each one is a perfect means of expressing the culture of the people who speak the language. Finally, we know that language changes. It is natural and normal for language to change; the only languages which do not change are the dead ones. This is easy to understand if we look backward in time. Change goes on in all aspects of language. Grammatical features change as do speech sounds, and changes in vocabulary are sometimes very extensive and may occur very rapidly. Vocabulary is the least stable part of any language.