单选题Julia Margaret Cameron was among the pioneers in a new kind of portrait photography—the close-up.

单选题The policeman went into action {{U}}as soon as{{/U}} they heard the alarm.

单选题This is not typical of English, but is a feature of the Chinese language.

单选题The high-speed trains can have a major impact on travel preferences A. force B. total C. small D. similar

单选题That guy is intelligent but a bit dull .

单选题Her mood can be {{U}}gauged{{/U}}, by her reaction to the most trivial of incidents.

单选题Messalina's name has become a {{U}}byword{{/U}} for notorious behavior.

单选题According to the passage, which of the following is most important in saving declining species?

单选题The book provides a concise analysis of the country's history. A. clean B. perfect C. real D. brief

单选题Parents have a legal duty to ensure that their children are provided with efficient education suitable to their age.

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。 Where Did All the Ships Go? The Bermuda Triangle 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 all 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(指南针) 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 Air Flight 19.{{U}} (56) {{/U}} December 5,1945, five bomber(轰炸机) 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(海空联合的) search in history . But they found nothing. Some people blamed the disappearances{{U}} (58) {{/U}}supernatural forces. It is suggested the {{U}}(59) {{/U}}ships and planes were either transported to other times and places, kidnapped(诱拐)by aliens{{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(有磁性的) compass 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.

单选题Mary {{U}}gets up{{/U}} at the same time every morning.

单选题Flying the Hypert Skies A little airplane has given new meaning to the term "going hyper." The Hyper-X recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound. That's about 5,000 miles per hour. At this speed, you'd get around the world -- flying along the equator -- in less than 5 hours. The Hyper-X is an unmanned, experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine known as a scramjet. It may sound like something from a comic book, but engineers have been experimenting with scramjets since the 1960s. For an engine to burn fuel and produce energy, it needs oxygen. A jet engine, like those on passenger airplanes, gets oxygen from the air. A rocket engine typically goes faster but has to carry its own supply of oxygen. A scramjet engine goes as fast as a rocket, but it doesn't have to carry its own oxygen supply. A scramjet's special design allows it to obtain oxygen from the air that flows through the engine. And it does so without letting the fast-moving air put out the combustion flames. However, a scramjet engine works properly only at speeds greater than five times the speed of sound. A booster rocket carried the Hyper-X to an altitude of about 100,000 feet for its test flight. The aircraft's record-beating flight lasted just 11 seconds. Although the little plane's self-powered flight lasted only 11 seconds, that brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes, comments Werner J. A. Dahm of the University of Michigan in Ann Arbor. In the future, engineers predict, airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink of space. Such hypersonic jets could potentially carry passengers anywhere in the world in just a few hours. Out of the three experimental Hyper-X aircrafts built for NASA, only one is now left. The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of the sound.

单选题Soldiers are trained to obey their officer"s orders without question.

单选题The State of Marriage Today Is there something seriously wrong with marriage today? During the past 50 years, the rate of divorce in the United States has exploded; almost 50% of marriages end in divorce now, and the evidence suggests it is going to get worse. If this trend continues, it will lead to the breakup of the family, according to a spokesperson for the National Family Association. Some futurists predict that in 100 years, the average American will marry at least four times, and extramarital affairs will be even more common than they are now. But what are the reasons for this, and is the picture really so gloomy? The answer to the first question is really quite simple: marriage is no longer the necessity it once was. The institution of marriage has been based for years partly on economic need. Women used to be economically dependent on their husbands as they usually didn"t have jobs outside the home. But with the rising number of women in well-paying jobs, this is no longer the case, so they don"t feel that they need to stay in a failing marriage. In answer to the second question, the outlook may not be as pessimistic as it seems. While the rate of divorce has risen, the rate of couples marrying has never actually fallen very much, so marriage is still quite popular. In addition to this, many couples now cohabit and don"t bother to marry. These couples are effectively married, but they do not appear in either the marriage or divorce statistics. In fact, more than 50% of first marriages survive. The statistics are deceptive because there is a higher number of divorces in second and third marriages than in-first marriages. So is marriage really an outdated institution? The fact that most people still get married indicates that it isn"t. And it is also true that married couples have a healthier life than single people: they suffer less from stress and its consequences, such as heart problems, and married men generally consider themselves more contented than their single counterparts. Perhaps the key is to find out what makes a successful marriage and apply it to all of our relationships!

单选题The nursery is bright and cheerful .

单选题You can research the topic by cooperating with others.

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。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案。{{B}}第一篇{{/B}} Medical Journals Medical journals are publications that report medical information to physicians and other health professionals. In the past, these journals were available only in print. With the development of electronic publishing, many medical journals now have Web sites on the Internet, and some journals publish only online. A few medical journals, like the Journal of the American Medical Association, are considered general medical journals because they cover many fields of medicine. Most medical journals are specialty journals that focus on a particular area of medicine. Medical journals publish many types of articles. Research articles report the results of research studies on a range of topics varying from the basic mechanisms of diseases to clinical trials that compare outcomes of different treatments. Review articles summarize and analyze the information available on a specific topic based on a careful search of the medical literature. Because the results of individual research studies can be affected by many factors, combining results from different studies on the same topic can be helpful in reaching conclusions about the scientific evidence for preventing, diagnosing or treating a particular disease. Case conferences and case reports may be published in medical journals to educate physicians about particular illnesses and how to treat at them. Editorials in medical journals are short essays that express the views of the authors, often regarding a research or review article published in the same issue. Editorials provide perspective on how the current article fits with other information on the same topic. Letters to the editor provide a way for readers of the medical journal to express comments, questions or criticisms about articles published in that journal.

单选题There was a simultaneous trial taking place in the next building.

单选题Their sole fault was a failure to recognize all the factors involved. A．maximum B．usual C．initial D．only