单选题The teacher threatened to______their X-box if they kept playing in classroom.

单选题On the other hand, ______ very deep pockets, the administration would not be concerned in the least about the cost of their lawyers. If fully ______, the corporate lawyers could file enough motions, take enough depositions, and pursue every possible appeal, to the point that you, quite literally, could litigate yourself into bankruptcy.

单选题A controversy erupted in the scientific community in early 1998 over the use of DNA (deoxyribonucleic acid) fingerprinting in criminal investigations. DNA fingerprinting was introduced in 1987 as a method to identify individuals based on a pattern seen in their DNA, the molecule of which genes are made. DNA is present in every cell of the body except red blood cells. DNA fingerprinting has been used successfully in various ways, such as to determine paternity where it is not clear who the father of a particular child is. However, it is in the area of criminal investigations that DNA fingerprinting has potentially powerful and controversial uses. DNA fingerprinting and other DNA analysis techniques have revolutionized criminal investigations by giving investigators powerful new tools in the attempt to prove guilt, not just establish innocence. When used in criminal investigations, a DNA fingerprint pattern from a suspect is compared with a DNA fingerprint pattern obtained from such material as hairs or blood found at the scene of a crime. A match between the two DNA samples can be used as evidence to convict a suspect. The controversy in 1998 stemmed from a report published in December 1991 by population geneticists Richard C. Lewontin of Harvard University in Cambridge, Mass., and Daniel L. Hartl called into question the methods to calculate how likely it is that a match between two DNA fingerprints might occur by chance alone. In particular, they argued that the current method cannot properly determine the likelihood that two DNA samples will match because they came from the same individual rather than simply from two different individuals who are members of the same ethnic group. Lewontin and Hartl called for better surveys of DNA patterns methods are adequate. In response to their criticisms, population geneticists Ranajit Chakraborty of the University of Texas in Dallas and Kenneth K. Kidd of Yale University in New Haven, Conn., argued that enough data are already available to show that the methods currently being used are adequate. In January 1998, however, the Federal Bureau of Investigation and laboratories that conduct DNA tests announced that they would collect additional DNA samples from various ethnic groups in an attempt to resolve some of these questions. And, in April, a National Academy of Sciences called for strict standards and system of accreditation for DNA testing laboratories.

单选题It is well-known that the retired workers in our country are ______ free medical care.

单选题 And researchers say that like those literary romantics Romeo and Juliet, they may be blind to the consequences of their quests for an idealized mate who serves their every physical and emotional need. Nearly 19 in 20 never-married respondents to a national survey agree that "when you marry you want your spouse to be your soul mate, first and foremost", according to the State of Our Unions: 2001 study released Wednesday by Rutgers University. David Popenoe, a Rutgers sociologist and one of the study's authors, said that view might spell doom for marriages. "It really provides a very unrealistic view of what marriage really is," Popenoe said. "The standard becomes so high, it's not easy to bail out if you didn't find a soul mate." The survey points to a fundamental dilemma in which younger people want more from the institution of marriage while they seemingly are unwilling to make the necessary commitments. The survey also suggests that some respondents expect too much from a spouse, including the kind of emotional support rendered by same-sex friends. The authors of the study also suggest that the generation that was polled may more quickly leave a margin because of infidelity than past generations. Popenoe said the poll, conducted by the Gallup organization, is the first of its kind to concentrate on people in their 20s. A total of 1,003 married and single young adults nationwide were interviewed by telephone between January and March. The margin of error was plus or minus four percentage points. Respondents said they eventually want to get married, realize it's a lot of work and think there are too many divorces. They believe there is one right person for them out there somewhere and think their own marriages won't end in divorce. Since the poll is the first of its kind, researchers say it is impossible to say if expectations about marriage are changing or static. But scholars say the search for soul mates has increased over the last generation--and the last century--as marriage has become an institution centering on romance rather than utility. "one hundred years ago, people married for financial reasons, for tying families together, they married for political reasons," said John DeLamater, a sociologist at the University of Wisconsin. "And most people had children." Those conditions are no longer the case for young adults like David Asher, a 24-year-old waiter in a Trenton cafe who has been in a relationship for about two years. He wants to wait to make sure he's ready to exchange vows. "I know a lot of it has to do with financial reasons," he said. "Maybe if you're going to have children, marriage is the best bet." But the main reason for matrimony: "If you're in love with someone, it's sort of like promising to them you are in love." "That's all well and good," said Heather Helms-Erikson, an assistant professor of human development and family studies at the University of North Carolina at Greensboro. "But passion--partly in endorphin- caused physiological phenomenon--has been known to diminish in time."

单选题At first she thought he was joking. It took Jason twenty minutes to convince her that he was______.

单选题His arm was______from the shark's mouth and reattached, but the boy, who nearly died, remained in a delicate condition. (2014年厦门大学考博试题)

单选题Research shows heavy coffee drinking is ______ a small increase in blood pressure, but not enough to increase the risk for high blood pressure.

单选题If the profits in one year are not sufficient to pay the dividend, the ______ will be paid from the profits of later year. A. arrear B. debt C. difference D. margin

单选题A 50-ft.wave travels at speeds ______ 20 m.p.h., and anyone who's too slow at the approach risks being smashed.

单选题A tourist is prevented from entering a country if he does not have ______ passport.

单选题 Passage 4 Most critical plot points in Harry Potter and the Sorcerer's Stone came from J.K. Rowling's imagination, but Flamel and his powerful pebble were legendary long before Harry went to Hogwarts. The 14th century alchemist created the philosopher's stone (called "sorcerer's" in U.S. editions of Potter), with which he turned mercury to gold and gained eternal life. But Flamel's tale - like his stone and his science - was no more real than a magic. The philosopher's stone was the key to alchemy, the medieval predecessor to chemistry that aimed to cure all illnesses, make the elixir of life, and transmute base metals into gold. The last made perfect sense at the time. The Aristotelian theory of elements stated that all things consisted of fire, air, water, and earth. So a little shift in one metal's composition could create gold. Hamel was renowned as an alchemical success. In 1382, after 25 years of studying an ancient book by "Abraham the Jew," he is said to have produced the philosopher's stone. His texts, notably a deconstruction of the "Abraham" work, were standard reading for aspiring scientists like Isaac Newtori. Many alchemists believed Flamel faked his 1418 death and that of his wife. Rumored sightings in the 18th century placed them at the Paris Opera. As late as 1816, there were reports of people searching Flamel's former house for secrets of the stone. Contemporary historians say a Nicolas Flamel did live in Paris in the 1300s and endowed many churches and hospitals with his wealth. But he was no alchemist. "He got his money in pedestr/an ways - his wife's earlier marriages, real-estate speculation," says Lawrence Principe, author of The Aspiring Adept. Anachronisms, style of language, and the lack of earlier copies indicate that none of "his" writings originated prior to the 1500s. "This sort of thing happens in alchemy," says Bill Newman, author of alchemical history Gehennical Fire. When an alchemist couldn't back up his ideas, he might publish them in the guise of a "lost" work. Flamel's wealth made a good candidate for alchemical identity theft. Flamel writings and sightings faded with alchemy's prestige. And the closest anyone's come to the philosopher's stone is Rowling. In her hands, it has yielded not just gold but eternal (shelf) life as well.

单选题The house is nearly finished but the windows haven' t been ______ yet.

单选题It is very plain that such a life as this is far more______to health than that of the man who can afford little leisure for necessary rest in the course of the day.

单选题The Silicon Valley employers promote the E-health program for the purpose of ______.

单选题When I found the light switch, the unshaded bulb only illuminated two small cats, sitting on the table ______ round the inside of the empty ham tin. A. swallowing B. gorging C. licking D. digesting

单选题Why are some of us good at math, or writing, while others______at art or basketball?

单选题He is a(n)______ and well-behaved child, but his parents worry about him for he talks too little.(2005年春季电子科技大学考博试题)

单选题To qualify for such a position, the native would first have to receive specialized training, and this is ______.

单选题The conference ______ a full week by the time it ends.