单选题By providing legal representation, the American Civil Liberties Union works to defend citizens against breaches of their civil rights.

单选题Paragraph 5_____

单选题The audience at the music hall Uapplauded/U enthusiastically after the piano solo.

单选题Some people would like to do shopping on Sundays since they expect to pick up wonderful articles in the market.A. batteriesB. bargainsC. basketsD. barrels

单选题The President made a brief visit to Beijing.

单选题People from many places were drawn to the city by its growing economy.

单选题Many scientists have been probing psychological problems. A. solving B. exploring C. settling D. handling

单选题The only access ______ that mountainous village is through a muddy path.A. forB. toC. acrossD. in

单选题Computer Mouse The basic computer mouse is 1 amazingly clever invention with a relatively simple design that allows us to point at things on the computer and it is very productive. Think of all the things you can do with a mouse like selecting text for copying and pasting, drawing, and even scrolling(滚动) on the page with the newer mice with the wheel. Most of us use the computer mouse daily without stopping to think how it 2 until it gets dirty and we have to learn how to 3 it. We learn to point at things 4 we learn to speak, so the mouse is a very natural pointing device. Other computer pointing devices include light pens, graphics tablets and touch screens, but the mouse is still our workhorse. The computer mouse was 5 in 1964 by Douglas Englehart of Stanford University. As computer screens became more popular and arrow keys were used to move around a body of text, it became clear that a pointing device that allowed easier motion through the text and even selection of text would be very useful. The introduction of the mouse, with the Apple Lisa computer in 1983, really started the computer public on the road to relying on the mouse 6 routine computer tasks. How does the mouse work? We have to start at the bottom, so think upside down for now. It all starts with the mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts (轴). The shafts are connected to wheels with several small holes in them. The wheels have a pair of small electronic light-emitting devices 7 light-emitting diodes (LED) mounted on either side. One LED sends a light beam to the LED on 8 side. As the wheels spin and a hole rotates by, the light beam gets through to the LED on the other side. But a moment 9 the light beam is blocked until the next hole is in place. The LED 10 a changing pattern of light, converts the pattern 11 an electronic signal, and sends the signal to the computer through wires in a cable that goes out of the mouse body. This cable is the tail that helps give the mouse its name. The computer interprets the signal to tell it where to position the cursor on the computer 12 . So far we have only discussed the basic computer mouse that 13 of you probably have or have used. One problem with this design is that the mouse gets dirty as the ball rolls over the surface and picks up dirt. 14 you have to clean your mouse. The newer optical mice 15 this problem by having no moving parts.

单选题 下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。请根据文章的内容，从每题所给的4个选项中选择1个最佳答案。{{B}}第一篇{{/B}} {{B}} U.S. Blacks Hard-hit by Cancer{{/B}} Death rates for cancer are falling for all Americans, but black Americans are still more likely to die of cancer than whites, the American Cancer Society said Monday. In a special report on cancer and blacks, the organization said blacks are usually diagnosed with cancer later than whites, and they are more likely to die of the disease. This could be because of unequal (不平等的) access to medical care, because blacks are more likely to have other diseases as well, and perhaps because of differences in the biology (生物学) of the cancer itself, the report added. "In general, black Americans have less hope of surviving five years after diagnosis than whites for all cancer sites and all stages of diagnosis," the report said. "In describing cancer statistics for black Americans, this report recognizes that many of the differences associated with race may be caused by unfair social and economic differences and unequal access to medical care." The cancer society said blacks should be encouraged to get check-ups (体格检查) earlier, when cancer is more treatable, and it said more research is needed to see if biological differences play a role. "The new statistics emphasize the continuing importance of wiping out these unfair social differences through public policy and education efforts," the organization said in a statement. But it also noted a drop in cancer death rates. "Cancer death rates in both sexes for all sites combined have dropped greatly among black Americans since 1992, as have incidence rates (发生率)," said the report.

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}} Economic Reform in China{{/B}} More US sinologists have expressed confidence in China's economic reform and the prospects for China's modernization. "If the reforms are implemented," said Doak Barnett, professor of Johns Hopkins University, they would{{U}} (51) {{/U}}the trend towards more significant and the broader economic ties between China and the United States, Which will have in some respects, a favorable impact {{U}}(52) {{/U}}political relations. "Also these{{U}} (53) {{/U}}will reinforce trend for China to become more steadily involved in the international economics and the international community." Barnett believes the{{U}} (54) {{/U}}is desirable, from China's point of{{U}} (55) {{/U}}, and for the international community, the more active China is in the international community, the larger role it may{{U}} (56) {{/U}}in world affairs." He said. In the direction of changing the economic system, China has made{{U}} (57) {{/U}}progress. "Personally, I think China has a capacity for moving{{U}} (58) {{/U}}in this direction, and I'm fairly confident that the Chinese leadership will{{U}} (59) {{/U}}to move in this direction." Alfred D. Wilhelm, project director of China Policy{{U}} (60) {{/U}}the Next Decade and senior fellow at the Atlantic Council,{{U}} (61) {{/U}}the economic changes will enable China and US to deal with each other on a more equal basis. "Chinese and Americans now have opportunity to{{U}} (62) {{/U}}fully in China's economic development and reciprocally (相互), Chinese will be able to{{U}} (63) {{/U}}technical and financial support from the American business community." Wilhelm said,"{{U}} (64) {{/U}}China has established laws and legislations (法规) to help its open-policy, American business now has the confidence to deal with the system, as they know their{{U}} (65) {{/U}}will be protected."

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}} Narcotic Addiction (麻醉品依赖) Heroin(海洛因)addiction today is found chiefly among young people in ghetto areas(贫农区) , of the more than 60,000 known addicts, more than half live in New York State. Most of these live in New York City. Recent figures show that more than half of the addicts are less than 30 years of age. Narcotic(麻醉剂)addiction in the United States is not limited to heroin users. Some middle-aged and older persons who take narcotic drugs regularly to relieve pain can also become addicted. So do some people who can get drugs easily, such as doctors, nurses and druggists. Studies show that this type of addict has personality and emotional problems very similar to those of other regular narcotic users. Many addicts admit that getting a continued supply is the main objective of their lives. His concentration on getting drugs often prevents .the addict from continuing his education or his job. His health is often poor. He may be sick one day from effects of withdrawal(撤退，这里指不吸毒) and sick the next from an overdose(吸毒过量). Statistics show that his life span(寿命) may be shorted by 15～20 years. He is usually in trouble with his family and almost always in trouble with the law. Some studies suggest that many of the known narcotic addicts had some trouble with the law before they became addicted. Once addicted, they may even become more involved with crime because it costs so much to support the heroin habit. Most authorities agree that the addict's involvement with crime is not a direct effect of the drug itself. Turning to crime is usually the only way he has of getting that much money. His crimes are always thefts or other crimes against property. Federal penalties for illegal usage of narcotics were established under the Harrison Act(哈里森法案令) of 1914. The Act provides(规定) that illegal possession of narcotics is punished by fines or imprisonment. Sentences can range from 2～10 years for further offences. Illegal sale of narcotics can mean a fine of $ 20,000 and a sentence from 20～40 years for later offences. A person who sells narcotics to someone under 18 is refused parole(假释)and probation (假释和缓刑), even for the first offences. If the drug is heroin, he can be sentenced to life imprisonment or to death.

单选题I know this is frustrating, but please try not to Ulose your temper/U.

单选题Even in a highly modernized country, manual work is still needed.

单选题To understand what we are going to talk about today, you have to rely on what you have read previously.A. beforehandB. carefullyC. beforeD. in advance

单选题Vice-President Lyndon Johnson became President of the United States following the death of John F. Kennedy and was subsequently elected to a full term in 1964. A. duly B. finally C. later D. therefore

单选题People’s traditional concepts about work no longer hold true.

单选题{{B}}第二篇{{/B}} Sustainable Development of Agriculture Sustainable development is applied to just about everything from energy to clean water and economic growth, and as a result it has become difficult to question either the basic assumptions behind it or the way the concept is put to use. This is especially true in agriculture, where sustainable development is often taken as the sole measure of progress without a proper appreciation of historical and cultural perspectives. To start with, it is important to remember that the nature of agriculture has changed markedly throughout history, and will continue to do so. Medieval agriculture in northern Europe fed, clothed and sheltered a predominantly rural society with a much lower population density than it is today. It had minimal effect on biodiversity, and any pollution it caused was typically localized. In terms of energy use and the nutrients(营养成分) captured in the product it was relatively inefficient. Contrast this with farming since the start of the industrial revolution. Competition from overseas led farmers to specialize and increase yields. Throughout this period food became cheaper, safer and more reliable. However, these changes have also led to habitat (栖息地)loss and to diminishing biodiversity. What's more, demand for animal products in developing countries is growing so fast that meeting it will require an extra 300 million tons of grain a year by 2050. Yet the growth of cities and industry is reducing the amount of water available for agriculture in many regions. All this means that agriculture in the 21s tcentury will have to be very different from how it was in the 20th. This will require radical thinking. For example, we need to move away from the idea that traditional practices are inevitably more sustainable than new ones. We also need to abandon the notion that agriculture can be "zero impact". The key will be to abandon the rather simple and static measures of sustainability, which centre on the need to maintain production without increasing damage. Instead we need a more dynamic interpretation, one that looks at the pros and cons (正反两方面) of all the various way land is used. There are many different ways to measure agricultural performance besides food yield: energy use, environmental costs, water purity, carbon footprint and biodiversity. It is clear, for example, that the carbon of transporting tomatoes from Spain to the UK is less than that of producing them in the UK with additional heating and lighting. But we do not know whether lower carbon footprints will always be better for biodiversity. What is crucial is recognizing that sustainable agriculture is not just about sustainable food production.

单选题 Dark Forces Dominate Universe The earth, moon, sun and all visible stars in the sky make up less than one percent of the universe. Almost all the rest is dark matter and dark energy, unknown {{U}} {{U}} 1 {{/U}} {{/U}}that puzzle astronomers. Observations in recent years have changed the basic understanding of how the universe evolved and have emphasized for astronomers how little is known {{U}} {{U}} 2 {{/U}} {{/U}}the major forces and substances that shaped our world. Astronomers now know that luminous matter-stars, planets and hot gas—{{U}} {{U}} 3 {{/U}} {{/U}}only about 0.4 percent of the universe. Non-luminous components, such as black holes and intergalacticgas, make up 3.6 percent. The rest is either dark matter, about 23 percent, or dark energy, about 73 percent. Dark matter, sometimes called "cold dark matter", has been known for some {{U}} {{U}} 4 {{/U}} {{/U}}. Only recently have researchers come to understand the pivotal role it {{U}} {{U}} 5 {{/U}} {{/U}}in the formation of stars, planets and even people. "We owe our very existence to dark matter," said physicist Paul Steinhardt and a co-author of a review on dark matter which appeared not long {{U}} {{U}} 6 {{/U}} {{/U}}in the journal Science. Steinhardt said it is believed that following the Big Bang, the theoretical {{U}} {{U}} 7 {{/U}} {{/U}}of the universe, dark matter caused particles to clump together. That set up the gravitation processes that led to the formation of stars and galaxies. Those stars, in turn, created the basic chemicals, such as carbon and iron, that were {{U}} {{U}} 8 {{/U}} {{/U}}to the evolution of life. "Dark matter dominated the formation of structure in the early universe," Steinhardt said. "For the first few billion years dark matter contained {{U}} {{U}} 9 {{/U}} {{/U}}of the mass of the universe. You can think of ordinary matter as a froth of an Ocean of dark matter. The dark matter clumps and the ordinary matter falls into it. That led to the {{U}} {{U}} 10 {{/U}} {{/U}}of the stars and galaxies." Without dark matter, "there {{U}} {{U}} 11 {{/U}} {{/U}}be virtually no structures in the universe." The nature of dark matter is {{U}} {{U}} 12 {{/U}} {{/U}}. It cannot be seen or detected {{U}} {{U}} 13 {{/U}} {{/U}}. Astronomers know it is there because of its effect on celestial objects than can be seen and measured. But the most dominating force of {{U}} {{U}} 14 {{/U}} {{/U}}in the universe is called dark energy. A recently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed. One scientist said it is clear now {{U}} {{U}} 15 {{/U}} {{/U}}dark matter and dark energy engaged in a gravitational tug of war that, eventually, dark energy won.

单选题Our arrangements were thrown into complete turmoil. A. failure B. confusion C. doubt D. relief