单选题Most doctors______on a diet which contains a lot of fat.

单选题The decline in moral standards—which has long concerned social analysts—has at last captured the attention of average Americans. And Jean Bethke Elshtain, for one, is glad. The fact that the ordinary citizens are now starting to think seriously about the nation's moral climate, says this ethics professor at the University of Chicago, is reason to hope that new ideas will come forward to improve it. But the challenge is not to be underestimated. Materialism and individualism in American society are the biggest obstacles. "The thought that 'I'm in it for me' has become deeply-rooted in the national consciousness, " Ms. Elshtain says. Some of this can be attributed to the disintegration of traditional communities, in which neighbors looked out for one another, she says. With today's greater mobility and with so many couples working, those bonds have been weakened replaced by a greater emphasis on self. In a 1996 poll of Americans, loss of morality topped the list of the biggest problems facing the U. S. And Elshtain says the public is correct to sense that: Data show that Americans are struggling with problems unheard of in the 1950s, such as classroom violence and a high rate of births to unmarried mothers. The desire for a higher moral standard is not a lament for some nonexistent "golden age, " Elshtain says, nor is it a wishful longing for a time that denied opportunities to women and minorities. Most people, in fact, favor the lessening of prejudice. Moral decline will not be reversed until people find ways to counter the materialism in society, she says. "Slowly, you recognize that the things that matter are those that can't be bought. /

单选题No very satisfactory account of the mechanism that caused the formation of the ocean basins has yet been given. The traditional view supposes that the upper mantle of the earth behaves as a liquid when it is subjected to small forces for long periods and that differences in temperature under oceans and continents are sufficient to produce convection in the mantle of the earth with rising convection currents under the mid-ocean ridges and sinking currents under the continents. Theoretically, this convection would carry the continental plates along as though they were on a conveyor belt and would provide the forces needed to produce the split that occurs along the ridge. This view may be correct: it has the advantage that the currents are driven by temperature differences that themselves depend on the position of the continents. Such a back-coupling, in which the position of the moving plate has an impact on the forces that move it, could produce complicated and varying motions. On the other hand, the theory is implausible because convection does not normally occur along lines, and it certainly does not occur along lines broken by frequent offsets or changes in direction, as the ridge is. Also it is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean. This plate is growing on both sides, and since there is no intermediate trench, the two ridges must be moving apart. It would be odd if the rising convection currents kept exact pace with them. An alternative theory is that the sinking part of the plate, which is denser than the hotter surrounding mantle, pulls the rest of the plate after it. Again it is difficult to see how this applies to the ridge in the South Atlantic, where neither the African nor the American plate has a sinking part. Another possibility is that the sinking plate cools the neighboring mantle and produces convection currents that move the plates. This last theory is attractive because it gives some hope of explaining the enclosed seas, such as the Sea of Japan. These seas have a typical oceanic floor, except that the floor is overlaid by several kilometers of sediment. Their floors have probably been sinking for long periods. It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins. The enclosed seas are an important feature of the earth"s surface, and seriously require explanation in because, addition to the enclosed seas that are developing at present behind island arcs, there are a number of older ones of possibly similar origin, such as the Gulf of Mexico, the Black Sea, and perhaps the North Sea.

单选题One of the responsibilities of the Coast Guard is to make sure that all ships ______ follow traffic rules in busy harbors.

单选题What does it feel like to be a______ after 20 years in the army?

单选题Notwithstanding its great diversity of styles, forms, themes, and functions, the theatre of today has its roots in a basic need to give meaning to the workings of the universe.

单选题His talent for music remained latent until his wife bought him guitar.

单选题______, the guest speaker was ushered into the auditorium hall to give the lecture.(北京大学2005年试题)

单选题A good sense of rhythm is one of his natural ______ as a poet. A. endowments B. interest C. weaknesses D. accomplishments

单选题There are still some outdated prejudices lurking in the minds of individuals.

单选题Fast food, a mainstay of American eating for decades, may have reached a plateau in the United States as the maturing baby-boom generation looks for a more varied menu. Fast food still represents a $ 102 billion a year industry, but growth has turned sluggish recently amid tough competition from retail food stores and a more affluent population willing to try new things and spend more, analysts say. Signs of trouble in fast food include price-cutting by industry leaders, including efforts by McDonald's to attract customers with a 55 cent hamburger, and major players pulling out or selling. O'Pepsico, for example, is selling its fast-food restaurant division that includes Taco Bell, Pizza Hut and KFC. "It's becoming harder and harder for these firms to grow," said Jim Brown, a professor of marketing at Virginia Tech University. "I think in the United States fast food has reached a saturation(饱和)point because of the number of competitors and the number of outlets. " Fast-food restaurant revenues grew 2. 5 percent in 1996, according to industry figures, the slowest since the recession of 1991. That is for cry from(大不相同于)the levels of the 1970s and 1980s. According to the Food Marketing Institute, consumers are using supermarkets for 21 percent of take-home food, nearly double the level of a year ago. While fast-food restaurants still lead, their share slipped significantly, from 48 percent in 1996 to 41 percent in 1997. " Consumers have never been more demanding than they are today," said Michael Sansolo, senior vice president of the Supermarket Trade Group. "They are pressed for time. Money is still an issue... but their tastes are increasingly diverse—whether it's gourmet foods, ethnic foods or organic offerings. " Meanwhile, the aging of the baby-boom population—and the growth in the number of so-called "empty nesters" with grown children—has meant a surge in the number of people willing to spend more for upscale items. This generation "will have the luxury of being more discriminating" as their children leave home, notes Harry Baker, vice president of the Chicago-based NPD consulting group. Balzer said some 18 million baby boomers will become empty-nesters in the next 10 years, leaving them with more disposable income to spend on dining out. " Fast and cheap will still be driving factors. . , but our definitions of fast and cheap may be changing. " Various reports suggest industry leader McDonald's is struggling, losing market share, with lower same-store sales while cutting back the number of new outlets in the United States, partly due to pressure from franchisers who don't want to be squeezed. The company replaced the head of its 12, 000 US restaurant chain last October amid a slump in US market share.

单选题Awareness of their identity means______.

单选题The concept of personal choice in relation to health behaviors is an important one. An estimated 90 percent of all illnesses may be preventable if individuals would make sound personal health choice based upon current medical knowledge. We all enjoy our freedom of choice and do not like to see it restricted when it is within the legal and moral boundaries of society. The structure of American society allows us to make almost all our own personal decisions that may concern our health. If we so desire, we can smoke, drink excessively, refuse to wear seat belts, eat whatever foods we want, and live a completely sedentary life-style without any exercise. The freedom to make much personal decision is a fundamental aspect of our society, although the wisdom of these decisions can be questioned. Personal choices relative to health often cause a difficulty. As one example, a teenager may know the facts relative to smoking cigarettes and health but may be pressured by friends into believing it is the socially accepted thing to do. A multitude of factors, both inherited and environmental, influence the development of health-related behaviors, and it is beyond the scope of this text to discuss all these factors as they may affect any given individual. However, the decision to adopt a particular health-related behavior is usually one of personal choice. There are healthy choices and there are unhealthy choices. In discussing the morals of personal choice, Fries and Crapo drew a comparison. They suggest that to knowingly give oneself over to a behavior that has a statistical probability of shortening life is similar to attempting suicide. Thus, for those individuals who are interested in preserving both the quality and quantity of life, personal health choices should reflect those behaviors that are associated with a statistical probability of increased vitality and longevity.

单选题There have been five extinction waves in the planet's history—including the Permian extinction 250 million years ago, (21) an estimated 70% of all land animals and 96% of all marine creatures vanished. The sample polling of animal populations so far suggests that we may have entered (22) will be the planet's sixth great extinction wave. Forests razed can grow back, polluted air and water can be cleaned—but (23) is forever. And we're not talking about losing just a few species. In fact, conservationists quietly (24) that we've entered an age of triage (治疗类选法), when we might have to decide which species can truly be (25) . The worst-case scenarios of habitat (26) and climate change—and that's the pathway we seem to be (27) —show the planet losing hundreds of thousands to millions of species, (28) of which we haven't even discovered yet. So (29) you care about tigers and elephants, rhinos and orangutans, then you should be scared. But (30) shouldn't leave us paralyzed. In hot spots like Madagascar and Brazil, conservationists are working with locals on the ground, (31) that the protection of endangered species is tied to the welfare of the people who live closest to them. A strategy known as avoided deforestation goes (32) , encouraging environmental protection (33) putting a price on the carbon locked in rain forests and allowing countries to trade credits in an international market, (34) that the carbon stays in the forest and is not cut or burned. It's (35) that any of this will stop the sixth extinction wave, let alone preserve the biodiversity we still enjoy, but we have no choice but to try.

单选题The technology supplied by Motorola is based on ______.

单选题D. H. Lawrence was the fourth child of Arthur Lawrence and Lydia Beards all, and their first to have been born in Eastwood. Ever since their marriage in 1875, the couple had been on the move: Arthur's job as a miner had taken them where the best-paid work had been during the boom years of the 1870s, and they had lived in a succession of small and recently built grimy colliery villages all over Nottinghamshire. But when they moved to Eastwood in 1883, it was to a place where they would remain for the rest of their lives; the move seems to have marked a watershed in their early history. For one thing, they were settling down: Arthur Lawrence would work at Brinsley colliery until he retired in 1909. For another, they now had three small children and Lydia may have wanted to give them the kind of continuity in schooling they had never previously had. It was also the case that, when they came to Eastwood, they took a house with a shop window, and Lydia ran a small clothes shop: presumably to supplement their income, but also perhaps because she felt she could do it in addition to raising their children. It seems possible that, getting on badly with her husband as she did, she imagined that further children were out of the question. Taking on the shop may have marked her own bid for independence. Arthur's parents lived less than a mile away, down in Brinsley, while his youngest brother Walter lived only 100 yards away from them in another company house, in Princes Street. When the family moved to Eastwood, Arthur Lawrence was coming back to his own family's center: one of the reasons, for sure, why they stayed there. Lydia Lawrence probably felt, on the other hand, more as if she were digging in for a siege. Eastwood may have been home to Arthur Lawrence, but to Lydia it was just another grimy colliery village which she never liked very much and where she never felt either much at home or properly accepted. Her Kent accent doubtless made Midlands people feel that she put on airs.

单选题It's easier to dismiss reports of low employee morale than face the facts and act______.