单选题The girl is gazing at herself in the mirror. A. staring B. laughing C. shouting D. smiling

单选题The procedures were perceived as complex and less {{U}}transparent{{/U}}. A. clear B. necessary C. special D. correct

单选题They agreed to settle the dispute by peaceful means.A. completeB. determineC. uniteD. solve

单选题I regret ______ those insulting words at the conference.A. sayingB. to sayC. saysD. said

单选题The reason for their unusual behavior remains a puzzle.

单选题A new system of quality control was brought in to overcome the defects in the firm's products.A. investedB. introducedC. installedD. insisted

单选题Jack was dismissed .

单选题At last John Smith chose to step down as the company"s chief executive and return to hisroots in software research.

单选题Rising College Selectivity Rising college selectivity doesn"t mean that students are smarter and more serious than in the past, although a few clearly are. It"s a function of excess demand for higher education occurring at a time of increased financial privatization of the industry. The recession has only increased demand. The vast majority of students aren"t going to college because of a thirst for knowledge, or even for the cultural and social adventure they hope to have. They"re there because they need a job, and they need to get the credentials—and, one hopes the knowledge and skills behind the credentials—that will get them into the labor market. As higher education has become a seller"s market, the institutions in a position to do so are doing what comes naturally: raising their tuitions and their admissions requirements, but at the expense of contributing to the national goal to increase college attainment. The result is that the United States is losing ground in the international race for educational talent, because although we have some of the best institutions in the world, the whole is less than the sum of its parts. The increasing stratification of higher education is happening on the spending side, as well. As the selective institutions have become more expensive and less attainable, the rest have had to struggle with the responsibility to enroll more students without being paid to do so. Gaps between rich and poor have grown even more dramatically than gaps in entering test scores. While spending is a poor measure of educational quality, we can"t seriously expect to increase educational attainment if we"re not prepared to do something to address these growing inequities in funding. That said, the educational policy problem in our country is not that the elite restitutions are becoming more selective. They are what they are, and they"re getting more like themselves all the time. The problem is on the public policy side. The president and many governors have set a goal to return America to a position of international leadership in educational attainment. It"s the right goal, we just need a financing strategy to get there. That doesn"t mean just more money, although some more money will be needed. It also means better attention to effectiveness and to efficiency, and to making sure that spending goes to the places that will make a difference in educational attainment. We know how to do it, if we want to.

单选题Grounded whales often struggle fruitlessly to reenter deep water.A. violentlyB. probablyC. in vainD. at length

单选题The river widens considerably as it begins to turn west.

单选题Many residents of apartment complexes object to noisy neighbors.

单选题The stain on his shirt is sure not to vanish.A. disappearB. appearC. mixD. blend

单选题A Debate on the English Language A measure declaring English the national language is under intense debate in the United States. The US Senate passed two declarations last week. One calls English the nation"s official language and the other says it is the "common and unifying (统一的)" tongue. But Americans found themselves divided on the issue. Since people worldwide know that most Americans speak only English, many can"t understand why the issue is so controversial (有争议的). "The discussion is related to fears of immigration issues," says Dick Tucker, a social scientist at Pittsburgh"s Carnegie Mellon University. "It"s related to a worry about the changing demography (人口统计) of the US. It"s a worry about who will continue to have political and economic influence." In fact, the notion of protecting the language has been kicked around almost since the nation"s founding. John Adams lobbied (游说) in 1780 for the creation of a national academy to correct and improve the English language. But his proposal died, since lawmakers saw it as a royalist (保皇主义者) attempt to define personal behavior. Since then, the country hasn"t had a national language, but the idea of recognizing the special status of English lived on. The emotions surrounding language resurface (再次浮现) not because people feel comfortable with English. It is more about the discomfort many Americans feel with the new languages, says Walt Wolfram, a professor at North Carolina State University. "Language is never about language," he says. According to the 2000 US Census Bureau report, of 209 million Americans over 18 years old, 172 million speak only English at home. About 37 million speak languages other than English. Among them, 6.5 million speak poor English and 3.1 million don"t speak English at all.

单选题Current hiring policies in the United States seek to provide equal employment opportunities for women and minority groups.A. furnishB. demandC. confirmD. continue

单选题 Alpha Particle From decaying radon (氡) atoms can destroy the living cells they strike and increase the likelihood that those cells will later become cancerous. Researchers have now directly demonstrated that neighboring cells not suffering direct hits can be harmed, too. They've also taken a step toward showing how this type of radiation, called alpha particles, indirectly hurts those bystanders. Radon derives from the decay of uranium (铀) and seeps naturally into the air from the ground. It's the primary environmental source of alpha particles, which contribute to cancer risk by causing aberrations (失常) in DNA. Alpha particles from inhaled radon are second only to smoking as a cause of lung cancer. Because a person's exposure to alpha particles typically is low, researchers have had to estimate public health threats from radon by guess from the effects of higher doses of alpha radiation. Such data comes primarily from studies of survivors of the atomic bombs that destroyed Hiroshima and Nagasaki in Japan. The customary extrapolation (推测) assumes that cancer risk is proportional to the dose of radiation even at low doses. Radiation's effects in cell cultures don't necessarily reflect what happens in "a whole organism, with its full range of defense repair mechanisms," says Duport. Processes such as DNA repair and cell death triggered by radiation damage could cancel the effect on by stander cells observed in the lab, he suggests. Furthermore, while a bystander effect can contribute to cancer, other cell-to-cell interactions in living tissue "may relieve increased risk." says Barry Michael, a radiation biophysicist at the Gray Cancer Institute in Northwood, England. One of these interactions halts cell division and hence cancer. "The jury is still out on whether cell-to-cell effects lead to a greater or lower risk. " Michael says.

单选题He decided to Uovercome/U his shortcomings.

单选题Are you {{U}}positive{{/U}} that there's no mistake?

单选题Smoking Since 1939, numerous studies have been conducted to determine whether smoking is a health hazard. The trend of the evidence has been consistent and indicates that there is a serious health risk. Research teams have conducted studies that show beyond all reasonable doubt that tobacco smoking is associated with a shortened life expectancy. Cigarette smoking is believed by most research workers in this field to be an important actor in the development of cancer of the lungs and cancer of the throat and is believed to be related to cancer of some other organs of the body. Male cigarette smokers have a higher death rate from heart disease than non-smoking males. Female smokers are thought to be less affected because they do not breathe in the smoke so deeply. Apart from statistics, it might be helpful to look at what tobacco does to the human body. Smoke is a mixture of gases, vaporized chemicals, minute particles of ash and other solids. There is also nicotine, which is powerful poison, and black tar. As smoke is breathed in, all those components form deposits on the membranes of the lungs. One point of concentration is where the air tube and bronchus divides. Most lung cancer begins at this point. Filters and low tar tobaccos are claimed to make smoking to some extent safer, but they can only slightly reduce, not eliminate the hazards.

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}} Where Did All the Ships Go?{{/B}} The Bermuda Triangle (本角区) is one{{U}} (51) {{/U}}the greatest mysteries of the sea. In this triangular area between Florida, Puerto Rico and Bermuda in Atlantic, ships and airplanes{{U}} (52) {{/U}}to disappear more often than in{{U}} (53) {{/U}}parts of the ocean. And they do so{{U}} (54) {{/U}}leaving any sign of an accident or any dead bodies. It is{{U}} (55) {{/U}}that Christopher Columbus was the first person to record strange happenings in the area. His compass stopped working, a flame came down from the sky, and a wave 100 to 200-feet-high carried his ship about a mile away. The most famous disappearance in the Bermuda Triangle was the US Naval (海军的) Air Flight 19,{{U}} (56) {{/U}}December 5, 1945, five bomber planes carrying 14 men{{U}} (57) {{/U}}on a training mission from the Florida coast. Later that day, all communications with Flight 19 were lost. They just disappeared without a trace. The next morning, 242 planes and 19 ships took part in the largest air-sea search in history. But they found nothing. Some people blame the disappearances{{U}} (58) {{/U}}supernatural (超自然的) forces, It is suggested the{{U}} (59) {{/U}}ships and planes were either transported to other times and places, kidnapped (绑架0) by aliens (外星人){{U}} (60) {{/U}}attacked by sea creatures. There are{{U}} (61) {{/U}}natural explanations, though. The US Navy says that the Bermuda Triangle is one of two places on earth{{U}} (62) {{/U}}a magnetic compass (指南针) points towards true north{{U}} (63) {{/U}}magnetic north.{{U}} (64) {{/U}}, planes and ships can lose their way if they don't make adjustments. The area also has changing weather and is known{{U}} (65) {{/U}}its high waves. Storms can turn up suddenly and destroy a plane or ship. Fast currents could then sweep away any trace of an accident.