单选题 The Case of the Disappearing Fingerprints One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints (指纹). Losing them could become troublesome. A case {{U}} {{U}} 1 {{/U}} {{/U}}online in a letter by Annals of Oncology (肿瘤学) indicates how big a {{U}} {{U}} 2 {{/U}} {{/U}}of losing fingerprints is. Eng-Huat Tan, a Singapore-based medical doctor describes a 62-year old man who has used capecitabine to {{U}} {{U}} 3 {{/U}} {{/U}}his nasopharyngeal cancer(鼻咽癌). After three years on the {{U}} {{U}} 4 {{/U}} {{/U}}, the patient decided to visit U. S. relatives last December. But he was stopped by U. S. customs officials {{U}} {{U}} 5 {{/U}} {{/U}}4 hours after entering the country when those officials couldn't get fingerprints from the man. There were no {{U}} {{U}} 6 {{/U}} {{/U}}swirly marks appearing from his index finger. U. S. customs has been fingerprinting incoming foreign visitors for years, Tan says. Unfortunately, for the Singaporean traveler, one potential {{U}} {{U}} 7 {{/U}} {{/U}}effect of his drug treatment is a smoothing of the tissue on the finger pads. {{U}} {{U}} 8 {{/U}} {{/U}},no fingerprints. "It is uncertain when fingerprint {{U}} {{U}} 9 {{/U}} {{/U}}will begin to take place in patients who are taking capecitabine," Tan points out. So he {{U}} {{U}} 10 {{/U}} {{/U}}any physicians who prescribe the drag to provide their patients with a doctor's {{U}} {{U}} 11 {{/U}} {{/U}}pointing out that their medicine may cause fingerprints to disappear. Eventually, the Singapore traveler made it into the United States. I guess the name on his passport didn't raise any red flags. But he's also now got the explanatory doctor's note—and won't leave home {{U}} {{U}} 12 {{/U}} {{/U}}it. By the way, maybe the Food and Drug Administration (美国食品药物管理局), {{U}} {{U}} 13 {{/U}} {{/U}}approved use of the drug 11 years ago, should consider updating its list of side effects {{U}} {{U}} 14 {{/U}} {{/U}}with this medicine. The current list does note that patients may experience vomiting (呕吐), stomach pain and some other side effects. But no where {{U}} {{U}} 15 {{/U}} {{/U}}it mention the potential for loss of fingerprints.

单选题A seed planted in the sensitive lining of an oyster begins a perpetual coating process that forms a pearl. A. total B. annual C. continual D. habitual

单选题What are my chances of promotion if I stay here?

单选题Since ancient times people have found various ways to preserve meat.A. carveB. cookC. freezeD. keep

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}}One Good Reason to Let Smallpox Live{{/B}} It's now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the glorious achievement of 1980, when smallpox was eradicated in the wild, by destroying the killer virus in the last two labs that are supposed to have it -- one in the US and one in Russia. If smallpox had truly gone from the planet, what point was there in keeping these reserves? {{U}} (51) {{/U}}reality, of course, it was naive to{{U}} (52) {{/U}}that everyone would let{{U}} (53) {{/U}}of such a potent potential weapon. Undoubtedly several nations still have{{U}} (54) {{/U}}vials.{{U}} (55) {{/U}}the last "official" stocks of live virus bred mistrust of the US and Russia,{{U}} (56) {{/U}}no obvious gain. Now American researchers have{{U}} (57) {{/U}}an animal model of the human disease, opening the{{U}} (58) {{/U}}for tests on new treatments and vaccines. So once again there's a good reason to{{U}} (59) {{/U}}the virus -- just in{{U}} (60) {{/U}}the disease puts in a reappearance. How do we{{U}} (61) {{/U}}with the mistrust of the US and Russia?{{U}} (62) {{/U}}. Keep the virus{{U}} (63) {{/U}}international auspices in a well-guarded UN laboratory that's open to all countries. The US will object, of course, just as it rejects a multilateral approach to just about everything. But it doesn't{{U}} (64) {{/U}}the idea is wrong, ff the virus{{U}} (65) {{/U}}useful, then let's make it the servant of all humanity -- not just a part of it.

单选题Please Uput up/U your hands if you have any questions.

单选题These old buildings are gorgeous .

单选题Dinner Order As any homemaker who has tried to keep order at the dinner table knows, there is far more to a family meal than food. Sociologist Michael Lewis has been studying 50 families to find out just how much more. Lewis and his co-workers carried out their study by videotaping the families while they ate ordinary meals in their own homes. They found that parents with small families talk actively with each other and their children. But as the number of children gets larger, conversation gives way to the parents" efforts to control the loud noise they make. That can have an important effect on the children. "In general the more question-asking the parents do, the higher the children"s IQ scores," Lewis says. "And the more children there are, the less question-asking there is." The study also provides an explanation for why middle children often seem to have a harder time in life than their siblings. Lewis found that in families with three or four children, dinner conversation is likely to center on the oldest child, who has the most to talk about, and the youngest, who needs the most attention. "Middle children are invisible," says Lewis. "When you see someone get up from the table and walk around during dinner, chances are that it"s the middle child." There is, however, one thing that stops all conversation and prevents anyone from having attention. "When the TV is on," Lewis says, "dinner is a non-event."

单选题I asked Lily whether she wanted to go swimming with me and she {{U}}nodded{{/U}}.

单选题By the time the war {{U}}broke out{{/U}}, most of the people had already left.

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。 {{B}} Earthquake{{/B}}{{B}}How does an earthquake start?{{/B}}What makes an earthquake happen? The rock of the earth's crust (地壳) may have a 'fault', a kind of break in the surface. The blocks which make up the earth move, and sometimes this may cause the sides of the fault to move up and down or lengthways (纵向地) against each other. When one piece of rock starts to rub on another with great force, a lot of energy is used. This energy is changed into vibrations (振动) and it is these vibrations that we feel as an earthquake. The vibrations can travel thousands of kilometers and so an earthquake in Turkey may be felt in Greece.{{B}}What to do during an earthquake?At school{{/B}}As soon as the earthquake starts, students should get under the desks immediately and wait until the teacher tells them it is safe to come out. The teacher should, at the same time, go immediately to the teacher's desk, get underneath (在......下面) it and stay there till the danger is over. Students must not argue with the teacher or question instructions. As soon as the tremors (震动) stop, all students should walk towards the exit and go straight to the school playground or any open space such as a square or a park. They must wait there until the teacher tells them it is safe to go.{{B}}At home{{/B}}If you are at home when the earthquake occurs, get immediately under the table in the living room or kitchen. Choose the biggest and strongest table you can find. You must not go anywhere near the window and don't go out onto the balcony (阳台). Once the tremors have stopped, you can come out from under the table but you must leave the building straight away. You should walk down the stairs and should not use the lift - there may be a power cut as a result of the earthquake and you could find yourself trapped inside the lift for hours.{{B}}In the street{{/B}}If you are in. the street when the earthquake takes place, do not stand near buildings, fences or walls - move away as quickly as possible and try to find a large open space to wait in. Standing under trees could also be dangerous.

单选题It can beinferred from the last paragraph that brown dwarfs.

单选题Electronic Mail During the past few years, scientists all over the world have suddenly found themselves productively engaged in task they once spent their lives avoiding—writing, any kind of writing, but particularly letter writing. Encouraged by electronic mail"s surprisingly high speed, convenience and economy, people who never before touched the stuff are regularly, skillfully, even cheerfully tapping out a great deal of correspondence. Electronic networks, woven into the fabric of scientific communication these days, are the route to colleagues in distant countries, shared data, bulletin boards and electronic journals. Anyone with a personal computer, a modern and the software to link computers over telephone lines can sign on. An estimated five million scientists have done so with more joining every day, most of them communicating through a bundle of interconnected domestic and foreign routes known collectively as the Internet, or net. E-mail is starting to edge out the fax, the telephone, overnight mail, and of course, land mail. It shrinks time and distance between scientific collaborators, in part because it is conveniently asynchronous (异步的) (Writer can type while their colleagues across time zones sleep; their message will be waiting.). If it is not yet speeding discoveries, it is certainly accelerating communication. Jeremy Bernstein, the physicist and science writer, once called E-mail the physicist"s umbilical cord (脐带). Later other people, too, have been discovering its connective virtues. Physicists are using it; college students are using it; everybody is using it; and as a sign that it has come of age, the New Yorker has celebrated its liberating presence with a cartoon—an appreciative dog seated at a keyboard, saying happily, "On the Internet, nobody knows you"re a dog."

单选题Unless Uchecked/U, rabbits can generate rapidly when conditions are in their favor.

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 1 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 2 the major forces and substances that shaped our world. Astronomers now know that luminous matter-stars, planets and hot gas— 3 only about 0.4 percent of the universe. Non-luminous components, such as black holes and intergalactic gas, 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 4 . Only recently have researchers come to understand the pivotal role it 5 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 6 in the journal Science. Steinhardt said it is believed that following the Big Bang, the theoretical 7 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 8 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 9 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 10 of the stars and galaxies." Without dark matter, "there 11 be virtually no structures in the universe." The nature of dark matter is 12 . It cannot be seen or detected 13 . Astronomers know it is there because of its effect on celestial objects than can be seen and measured. But the most dominating force of 14 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 15 dark matter and dark energy engaged in a gravitational tug of war that, eventually, dark energy won.

单选题The dolphin leapt up into the air because Sagan was too near the water.

单选题These factors interact intimately and cannot be separated. A. tensely B. nearly C. carefully D. closely

单选题It doesn't {{U}}stand to reason{{/U}} that he would lie. A. seem logical B. look pleasant C. appear obvious D. sound important

单选题I recognized him {{U}}right away{{/U}} even though Richard disguised well.

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：如果该句提的是正确信息，请选择A：如果该句提的是错误信息，请选择B：如果该句的信息文中没有提及，请选择C。 Irradiating Food Irradiating fruits, vegetables, pork and chicken to kill insects and bacteria has been approved by the Food and Drug Administration over the past decade. Irradiation of other meats, such as beef and lamb, is being reviewed. Federal approval does not require that industry adopt the process, and few food processors presently offer irradiated products. Market studies have shown that many consumers are afraid that eating irradiated foods may cause cancer, despite scientific studies that prove the safety of treated foods. Some people argue that more severe government inspection, higher food-safety standard and more careful-preparation practices by consumers are all that is needed to ensure that food is safe. Consequently, companies currently see no need to spend millions of dollars outfitting processing plants with the equipment necessary for a process that very few shoppers are in favor of. All supermarkets that sell irradiated food must label the food either directly on the packaging, or, in the case of bulk items like fruits and vegetables, by placing a sign nearby. There is no requirement for the labeling of irradiated food served by chain restaurants or hospitals that buy directly from distributors, nor any regulations for products that contain irradiated ingredients. Presently, the FDA allows food to be treated with three types of radiation -- gamma rays (伽马射线), high-energy electrons, and X rays -- and sets limits on doses, depending on the type of food. The principle is that the dose to be used for a certain type of food should not exceed the amount that is sufficient to kill most harmful insects and bacteria present in it. Different types of food, because of their molecular compositions, may require different doses of radiation.