单选题Academic papers are often part of a university's official file and can neither be returned to students nor duplicated.A. borrowedB. copiedC. purchasedD. destroyed

单选题Eta Carinae is now engaging in

单选题Storms Sink Ships Rescuers have found the bodies of over 130 people killed in two ferry disasters in Bangladesh. The accidents happened during a storm that hit the country on April 21. Hundreds more are missing or feared dead. The two ferries sank in different rivers near the capital city of Dhaka as strong winds and rain hit the South Asian country. The government has since banned all ferries and other boats from traveling at night during the April-May stormy season. One of the ferries, MV Mitali, was carrying far more people than it was supposed to. About 400 passengers fitted into a space made for just 300, police said. The second ferry carried about 100 passengers. "The number of deaths is certain to rise." said an official in charge of the rescue work. "No one really knows how many people were on board the ferry or how many of them survived." Ferries in Bangladesh don"t always keep passenger lists, making it difficult to determine the exact number of people on board. Besides the ferry accidents, at least 40 people were killed and 400 injured by lightning strikes, falling houses and trees and the sinking of small boats. Storms are common this time of year in Bangladesh, as are boating accidents. Ferry disasters take away hundreds of lives every year in a nation of 130 million people. Officials blame these river accidents on a lack of safety measures, too many passengers in boats and not enough checks on weather conditions. Ferries are a common means of transport in Bangladesh. It is a country covered by about 230 rivers. Some 20,000 ferries use the nation"s waterways every year. And many of them are dangerously overcrowded. Since 1977, more than 3,000 people have died in some 260 boating accidents.

单选题 Genetically Modified Foods If you want to spark a heated debate at a dinner party, bring up the topic of genetically modified foods. For many people, the concept of genetically altered, high-tech crop production raises all kinds of environmental, healthy, safety and ethical questions. Particularly in countries with long grain traditions-and vocal green lobbies--the idea seems against nature. In fact, genetically modified foods are already very much a part of out lives. A third of the corn and more than half the soybeans and cotton grown in the U.S. last year were the product of biotechnology, according to the Department of Agriculture. More than 65 million acres of genetically modified crops will be planted in the U.S. this year. The genetic genie (妖怪) is out of the bottle. Yet there are clearly some very real issues that need to be resolved. Like any new product entering the food chain, genetically modified foods must be subjected to rigorous testing. In wealthy countries, the debate about biotech is tempered by the fact that we have a rich array of foods to choose from and a supply that far exceeds our needs. In developing countries desperate to feed fast-growing and underfed populations, the issue is simpler and much more urgent: Do the benefits of biotech outweigh the risks? The statistics on population growth and hunger are disturbing. Last year the world's population reached 6 billion. The U.N. estimates that nearly 800 million people around the world are undernourished. The effects are devastating. About 400 million women of child-bearing age are iron deficient, which means their babies are exposed to various birth defects. As many as 100 million children suffer from vitamin A deficiency, a leading cause of blindness. How can biotech help? Biotechnologists have developed genetically modified rice that is fortified with beta-carotene-which the body converts into vitamin A and additional iron, and they are working on other kinds of nutritionally improved crops. Biotech can also improve farming productivity in places where food shortages are caused by crop damage attributable to pests, drought, poor soil and crop viruses, bacteria or fungi.

单选题阅读下面这篇短文，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。 {{B}} Mad Scientist Stereotype Outdated{{/B}} Do people still imagine a physicist as a bearded man in glasses or has the image of the mad scientist changed? The Institute of Physics set out to find out whether the stereotype of a physics "boffin" (科学家) still exists by conducting a survey on shoppers in London. The people were asked to identify the physicist from a photograph of a line-up of possible suspects. 98 percent of those asked got it wrong. The majority of people picked a white male of around 60, wearing glasses and with a white beard. While this stereotype may have been the image of an average physicist fifty years ago, the reality is now very different. Since 1960 the number of young women entering physics has doubled and the average age of a physicist is now 31. The stereotype of the absent-minded scientist has lasted a long time because the media and Hollywood help promote the image of men in white lab coats with glasses sitting by blackboards full of equations (等式) or working with fizzing (嘶嘶响) test tubes. These stereotypes are really damaging to society. Very good school children are put off studying science because they don't see people like themselves on television or in magazines doing science. They simply don't relate to the media's image of the mad scientist. This is one reason why fewer young people are choosing to do science at university. If we want to encourage more young people to study science subjects, we need to change this image of the scientist and make science careers more attractive. But we must also develop children's interest in science. In an attempt to change this negative image, an increasing number of science festivals are being organized. Thousands of people from secondary schools are also encouraged to take part in nationwide science competitions of which the most popular are the national science Olympiads. Winning national teams then get the opportunity to take part in the International Science Olympiads which are held in a different country every year. These events are all interesting for the young people who take part but they only involve a small proportion of students who are already interested in science. It seems that there is a long way to go before science becomes attractive as subjects like computer studies or fashion and design.

单选题Even in a highly Modernized country, {{U}}manual{{/U}} work is still needed. A. physical B. mental C. natural D. hard

单选题At 90, many individuals still remain healthy and Uenergetic/U.

单选题He is accustomed to living in the countryside.A. usedB. devotedC. determinedD. fond

单选题She is noted for her {{U}}generous{{/U}} contribution for the relief of the poor.

单选题The people who speak Esperanto(世界语) hope that the language someday will become the Uinternational/U language for trade, science, and diplomacy.

单选题"Liquefaction" Key to Much of Japanese Earthquake Damage The massive subduction zone earthquake in Japan caused a significant level of soil "liquefaction" that has surprised researchers with its widespread severity, a new analysis 1 "We"ve seen localized examples of soil liquefaction as extreme as this before, but the distance and 2 of damage in Japan were 3 severe," said Scott Ashford, a professor of geotechnical engineering at Oregon State University. "Entire structures were tilted and sinking into the sediments," Ashford said. "The shifts in soil destroyed water, drain and gas pipelines, crippling the utilities and infrastructure these communities need to function. We saw some places that sank as 4 as four feet." Some degree of soil liquefaction is common in almost any major earthquake. It"s a phenomenon in which soils soaked with water, 5 recent sediments or sand, can lose much of their 6 and flow during an earthquake. This can allow structures to shift or sink or collapse. But most earthquakes are much shorter than the recent event in Japan, Ashford said. The length of the Japanese earthquake, as much as five minutes, may force researchers to 7 the extent of liquefaction damage possibly occurring in situations such as this. "With such a long-lasting earthquake, we saw 8 structures that might have been okay after 30 seconds just continued to sink and tilt as the shaking continued for several more minutes," he said. "And it was clear that younger sediments, and especially areas built on recently filled ground, are much more 9 " The data provided by analyzing the Japanese earthquake, researchers said, should make it possible to improve the understanding of this soil phenomenon and better prepare 10 it in the future. Ashford said it was critical for the team to collect the information 1 , before damage was removed in the recovery efforts. "There"s no doubt that we"ll learn things from what happened in Japan that will help us to reduce risks in other similar 12 ," Ashford said. "Future construction in some places may make more use of techniques known to reduce liquefaction, such as better compaction to make soils dense, or use of reinforcing stone columns." Ashford pointed out that northern California have younger soils vulnerable to liquefaction—on the coast, near river deposits or in areas with filled ground. The "young" sediments, in geologic terms, may be those 13 with in the past 10,000 years or more. In Oregon, for instance, that describes much of downtown Portland, the Portland International Airport and other cities. Anything near a river and old flood plains is a suspect, and the Oregon Department of Transportation has already concluded that 1, 100 bridges in the state are at risk from an earthquake. Fewer than 15 percent of them have been reinforced to 14 collapse. Japan has 15 tremendous losses in the March 11 earthquake, but Japanese construction standards helped prevent many buildings from collapse—even as they tilted and sank into the grourd.

单选题Her heart was filled with compassion for the motherless children.

单选题They have the capability to destroy the enemy in a few days.

单选题After an exchange of gunfire, the terrorist group surrendered at last.A. gave offB. gave upC. gave inD. gave away

单选题What is said about cell phone use in paragraph 4?

单选题阅读下面的短文，文中有15处空白，每处空白给-出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。 At the bottom of the world lies a mighty continent still wrapped in the Ice Age and, until recent times, unknown to man. It is a great land mass crisscrossed by mountain{{U}} (51) {{/U}}whose extent and elevation are still uncertain. Much of the{{U}} (52) {{/U}}is a complete blank on our maps. A 1,000-mile stretch of the coastline has never been{{U}} (53) {{/U}}by any ship. Man has{{U}} (54) {{/U}}, on foot, less than one per cent of its ares. Antarctica differs fundamentally from the Arctic regions. The Arctic is an ocean,{{U}} (55) {{/U}}with drifting packed ice and surrounded by the land masses of Europe, Asia, and North America. The Antarctic is a continent nearly as{{U}} (56) {{/U}}as Europe and Au stralia combined, centered roughly{{U}} (57) {{/U}}the South Pole and{{U}} (58) {{/U}}by the most unobstructed water areas of the world—the Atlantic, Pacific, and Indian Oceans. The continental ice{{U}} (59) {{/U}}is more than two miles high at its center; thus, the air over the Antarctic is far more refrigerated than it is over the Arctic regions. This{{U}} (60) {{/U}}air cascades off the land with such{{U}} (61) {{/U}}that it makes the nearby seas the stormiest in the world and renders{{U}} (62) {{/U}}those regions whose counterparts at the opposite end of the{{U}} (63) {{/U}}are inhabited. Thus, more than a million persons live within 2,000 miles of the North Pole in an area that{{U}} (64) {{/U}}most of Alaska, Siberia, and Scandenavia—a region{{U}} (65) {{/U}}in forest and mining industries. Except for a handful of weather stations, within the same distance of the South Pole there is not a single tree, industry, or settlement.

单选题We have never seen such gorgeous hills.

单选题The restaurant has a good reputation .

单选题Outside-the-classroom Learning Putting a group of college students in charge of a $300,000 Dance Marathon, fundraiser surely sounds a bit risky. When you consider the fact that the money is supposed to be given to children in need of medical care, you might call the idea crazy. Most student leaders don"t want to spend a large amount of time on something they care little about, said 22-year-old University of Florida student Darren Heitner. He was the Dance Marathon"s operations officer for two years. Yvonne Fangmeyer, director of the student organization office at the University of Wisconsin, conducted a survey in February of students involved in campus organizations. She said the desire for friendship was the most frequently cited reason for joining. At large universities like Fangmeyer"s, which has more than 40,000 students, the students first of all want to find a way to "belong in their own corner of campus". Katie Rowley, a Wisconsin senior, confirms the survey"s findings. "I wanted to make the campus feel smaller by joining an organization where I could not only get involved on campus but also find a group of friends." All of this talk of friendship, however, does not mean that students aren"t thinking about their résumés. "I think that a lot of people do join to " fatten up their résumés"," said Heitner. "At the beginning of my college career, I joined a few of these organizations, hoping to get a start in my leadership roles." But without passion student leaders can have a difficult time trying to weather the storms (经受风雨) that will come. For example, in April, several student organizations at Wisconsin teamed up for an event designed to educate students about homelessness and poverty. Student leaders had to face the problem of solving disagreements, moving the event because of rainy weather, and dealing with the university"s complicated bureaucracy (官僚机构). "Outside-the-classroom learning really makes a big difference," Fangmeyer said.

单选题The weather was Ucrisp/U and clear and you could see the mountains fiftymiles away.