单选题By referring______his notes, the speaker was able to give the exact details required.

单选题We don't need heating system, ______.

单选题There was to be more use, where necessary and if carefully monitored, of ______ capital re- sources drawn from international institutions such as the World Bank. A. complementary B. compulsory C. supplementary D. compensatory

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 choices 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 such personal decisions 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 draw 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In theory, Ecuador could be a major exporter of shrimp. In actuality, it is not. The explanation is that 80 percent of the country's rich estuaries are owned by the government. This hurts Ecuador's shrimp production, because the government does not have the flexibility necessary for efficient shrimp farming that private industry possesses. The answer to which of the following questions would be most relevant to evaluating the adequacy of the explanation given above? A. Who owns the 20 percent of estuaries that are not owned by the government? B. What percentage of Ecuador's production of shrimp is consumed domestically? C. Has the government stated any plans to sell any of its estuaries to private industry, provided that the price is sufficient? D. Is Peru, Ecuador's neighbor to the south, actually better suited for commercial shrimp farming than Ecuador, which is a substantially smaller country? E. How does Ecuador's shrimp production on government-owned estuaries compare to that on comparable land owned by private industry?

单选题Ice can be used to keep food from Uspoiling/U.

单选题(2007)Training is provided, so no______experience is required for the job.

单选题Our main concern is to ______ the living standard of the people. A. raise B. rise C. arise D. arouse

单选题Excuse me for ( ) you with such a small matter

单选题Their evidence was convincing but not______.

单选题It is suggested that smoking______in public places.

单选题The box is ______ heavy for the girl ______ carry. A. too, to B. to, too C. so, that D. no, to

单选题Gordon Shaw the physicist, 66, and colleagues have discovered what"s known as the "Mozart effect", the ability of a Mozart sonata, under the fight circumstances, to improve the listener"s mathematical and reasoning abilities. But the findings are controversial and have launched all kinds of crank notions about using music to make kids smarter. The hype, he warns, has gotten out of hand. But first, the essence: is there something abut the brain cells work to explain the effect? In 1978 the neuroscientist Vernon Mountacastle devised a model of the neural structure of the brain"s gray matter. Looking like a thick band of colorful bead work, it represents the firing patterns of groups of neurons. Building on Mountcastle, Shaw and his team constructed a model of their own. On a lark, Xiaodan Leng, who was Shaw"s colleague at the time, used a synthesizer to translate these patterns into music. What came out of the speakers wasn"t exactly toe-tapping, but it was music. Shaw and Leng inferred that music and brain-wave activity are built on the same sort of pattern. "Gordon is a contrarian in his thinking," says his longtime friend, Nobel Prize-Winning Standford Physicist Martin Perl. "That"s important. In new areas of science, such as brain research, nobody knows how to do it." What do neuroscientists and psychologists think of Shaw"s findings? They haven"t condemned it, but neither have they confirmed it. Maybe you have to take them with a grain of salt, but the experiments by Shaw and his colleagues are intriguing. In March a team led by Shaw announced that young children who had listened to the Mozart sonata and studied the piano over a period of months improved their scores by 27% on a test of ratios and proportions. The control group against which they were measured received compatible enrichment course—minus the music. The Mozart-trained kids are now doing math three grade levels ahead of their peers, Shaw claims. Proof of all this, of course, is necessarily elusive because it can be difficult to do a double blind experiment of educational techniques. In a double blind trial of an arthritis drug, neither the study subjects nor the experts evaluating them know which ones got the best treatment and which a dummy pill. How do you keep the participants from knowing it"s Mozart on the CD?

单选题Great ______ the difficulties are, we must do our best to succeed. A. while B. as C. although D. however

单选题 There are few more sobering online activities than entering data into college-tuition calculators and gasping as the Web spits back a six-figure sum, But economists say families about to go into debt to fund four years of partying, as well as studying, can console themselves with the knowledge that college is an investment that, unlike many bank stocks, should yield huge dividends. A 2008 study by two Harvard economists notes that the "labor-market premium to skilr " —or the amount college graduates earned that's greater than what high-school graduates earned—decreased for much of the 20th century, but has come back with a vengeance since the 1980s. In 2005, the typical full-time year-round U.S. worker with a four-year college degree earned $ 50,900, 62% more than the $ 31,500 earned by a worker with only a high-school diploma. There's no question that going to college is a smart economic choice. But a look at the strange variations in tuition reveals that the choice about which college to attend doesn't come down merely to dollars and cents. Does going to Columbia University (tuition, room and board $ 49,260 in 2007-2008) yield a 40% greater return than attending the University of Colorado at Boulder as an out-of-state student( $ 35,542)? Probably not. Does being an out-of-state student at the University of Colorado at Boulder yield twice the amount of income as being an in-state students( $17,380) there? Not likely. No, in this consumerist age, most buyers aren't evaluating college as an investment, but rather as a consumer product—like a car or clothes or a house. And with such purchases, price is only one of many crucial factors to consider. As with automobiles, consumers in today's college marketplace have vast choices, and people search for the one that gives them the most comfort and satisfaction in line with their budgets. This accounts for the willingness of people to pay more for different types of experiences(such as attending a private liberal-arts college or going to an out-of-state public school that has a great marine-biology program). And just as two auto purchasers might spend an equal amount of money on very different cars, college students(or, more accurately, their parents)often show a willingness to pay essentially the same price for vastly different products. So which is it?

单选题She______in the feet on her way home from work. A. was hurting B. is hurt C. hurts D. got hurt

单选题Many a writer of newspaper articles ______ to writing novels. A. has turned B. have turned C. have been turned D. has been turned