Many Americans harbour a grossly distorted and exaggerated view of most of the risks surrounding food. Fergus Clydesdale, head of the department of food science and nutrition at the University of Massachusetts-Amherst, says bluntly that if the dangers from bacterially contaminated chicken were as great as some people believe, “the streets would be littered with people lying here and there.”
    Though the public increasingly demands no-risk food, there is no such thing. Bruce Ames, chairman of the biochemistry department at the University of California, Berkeley, points out that up to 10% of a plant’s weight is made up of natural pesticides (杀虫剂). Says he: “Since plants do not have jaws or teeth to protect themselves, they employ chemical warfare.” And many naturally produced chemicals, though occurring in tiny amounts, prove in laboratory tests to be strong carcinogens-a substance which can cause cancer. Mushrooms (磨菇) might be banned if they were judged by the same standards that apply to food additives (添加剂). Declares Christina Stark, a nutritionist at Cornell University: “We’ve got fat worse natural chemicals in the food supply than anything man-made.”
    Yet the issues are not that simple. While Americans have no reason to be terrified to sit down at the dinner table, they have every reason to demand significant improvements in food and water safety. They unconsciously and unwillingly take in too much of too many dangerous chemicals. If food already contains natural carcinogens, it does not make much sense to add dozens of new man-made ones. Though most people will withstand the small amounts of contaminants generally found in food and water, at least a few individuals will probably get cancer one day be cause of what they eat and drink.
    To make good food and water supplies even better, the Government needs to tighten its regulatory standards, stiffen its inspection program and strengthen its enforcement policies. The food industry should modify some long-accepted practices or turn to less hazardous alternatives. Perhaps most important, consumers will have to do a better job of learning how to handle and cook food properly. The problems that need to be tackled exist all along the food-supply chain, from fields to processing plants to kitchens.

    There are some each phenomena you can count on, but the magnetic field, someday is not of them. It fluctuates in strength, drifts from its axis, and every few 100,000 years undergo, dramatic polarity reversal-a period when North Pole becomes South Pole and South Pole becomes North Pole. But how is the field generated, and why is it so unstable?
    Groundbreaking research by two French geophysicists promises to shed some light on the mystery. Using 80 metres of deep sea sediment (沉淀物) core, they have obtained measurements lots of magnetic-field intensity that span 11 polarity reversals and four million years. The analysis reveals that intensity appears to fluctuate with a clear, well-defined rhythm. Although the strength of the magnetic field varies irregularly during the short term, there seems to be an inevitable long-term decline preceding each polarity reversal. When the poles flip—a process that takes several hundred thousand years-the magnetic field rapidly regains its strength and the cycle is repeated.
    The results have caused a stir among geophysicists. The magnetic field is thought to originate from molten (熔化的) iron in the outer core, 3,000 kilometers beneath the earth’s surface. By studying mineral grains found in material ranging from rocks to clay articles, previous researchers have already been able to identify reversals dating back 170 million years, including the most recent switch 730,000 years ago. How and why they occur, however, has been widely debated. Several theories link polarity flips to external disasters such as meteor (陨星) impacts. But Peter Olson, a geophysicist at the Johns Hopkins University in Baltimore, says this is unlikely if the French researchers are right. In fact, Olson says intensity that predictably declines from one reversal to the next contradicts 90 percent of the models currently under study. If the results prove to be valid geophysicists will have a new theory to guide them in their quest to understand the earth’s inner physics. It certainly points the direction for future research.

    Imagine a world in which there was suddenly no emotion-a world in which human beings could feel no love or happiness, no terror or hate. Try to imagine the consequences of such a transformation. People might not be able to stay alive: knowing neither joy nor pleasure, anxiety nor fear, they would be as likely to repeat acts that hurt them as acts that were beneficial. They could not learn: they could not benefit from experience because this emotionless world would lack rewards and punishments. Society would soon disappear: people would be as likely to harm one another as to provide help and support. Human relationships would not exist: in a world without friends or enemies, there could be no marriage, affection among companions, or bonds among members of groups. Society’s economic underpinnings (支柱) would be destroyed: since earning $10 million would be no more pleasant than earning $10, there would be no incentive to work. In fact, there would be no incentives of any kind. For as we will see, incentives imply a capacity to enjoy them.
    In such a world, the chances that the human species would survive are next to zero, because emotions are the basic instrument of our survival and adaptation. Emotions structure the world for us in important ways. As individuals, we categorize objects on the basis of our emotions. True we consider the length, shape, size, or texture, but an object’s physical aspects are less important than what it has done or can do to us—hurt us, surprise us, anger us or make us joyful. We al so use categorizations colored by emotions in our families, communities, and overall society. Out of our emotional experiences with objects and events comes a social feeling of agreement that certain things and actions are good and others are bad, and we apply these categories to every aspect of our social life—from what foods we eat and what clothes we wear to how we keep promises and which people our group will accept. In fact, society exploits our emotional reactions and attitudes, such as loyalty morality, pride shame, guilt, fear and greed, in order to maintain itself It gives high rewards to individuals who perform important tasks such as surgery, makes heroes out of individuals for unusual or dangerous achievements such as flying fighter planes in a war, and uses the legal penal (刑法的) system to make people afraid to engage in antisocial acts.

    The Carnegie Foundation report says that many colleges have tried to be “all things to all people”. In doing so, they have increasingly catered to a narrow minded careerism while failing to cultivate a global vision among their students. The current crisis, it contends, does not derive from a legitimate desire to put learning to productive ends. The problem is that in too many academic fields, the work has no context; skills, rather than being means, have become ends. Students are offered a variety of options and allowed to pick their way to a degree. In short, driven by careerism, “the nation’s colleges and universities are more successful in providing credentials (文凭) than in providing a quality education for their students. “The report concludes that the special challenge confronting the undergraduate college is one of shaping an integrated core of common learning. Such a core would introduce students to essential knowledge, to connections across the disciplines, and in the end, to application of knowledge to life beyond the campus. “
    Although the key to a good college is a high-quality faculty, the Carnegie study found that most colleges do very little to encourage good teaching. In fact, they do much to undermine it. As one professor observed: “Teaching is important, we are told, and yet faculty know that research and publication matter most.” Not surprisingly, over the last twenty years colleges and universities have failed to graduate half of their four-year degree candidates. Faculty members who dedicated themselves to teaching soon discover that they will not be granted tenure (终身任期), promotion, or substantial salary increases. Yet 70 percent of all faculties say their interests lie more in teaching than in research. Additionally, a frequent complaint among young scholars is that “There is pressure to publish, although there is virtually no interest among administrators or colleagues in the content of the publications.”

    Many parents who welcome the idea of turning off the TV and spending more time with the family are still worried that without TV they would constantly be on call as entertainers for their children. They remember thinking up all sorts of things to do when they were kids. But their own kids seem different, less resourceful, somehow. When there’s nothing to do, these parents observe regretfully, their kids seem unable to come up with any thing to do besides turning on the TV.
    One father, for example, says. “When I was a kid, we were always thinking up things to do, projects and games. We certainly never complained in an annoying way to our parents, ‘I have nothing to do!’ He compares this with his own children today: “They’re simply lazy. If someone doesn’t entertain them, they’ll happily sit there watching TV all day. “
    There is one word for this father’s disappointment: unfair. It is as if he were disappointed in them for not reading Greek though they have never studied the language. He deplores (哀叹) his children’s lack of inventiveness, as if the ability to play were something innate (天生的) that his children are missing. In fact, while the tendency to play is built into the human species, the actual ability to play-to imagine, to invent, to elaborate on reality in a playful way-and the ability to gain fulfillment from it, these are skills that have to learned and developed.
    Such disappointment, however, is not only unjust, it is also destructive. Sensing their parents’ disappointment, children come to believe that they are, indeed, lacking something, and that this makes them less worthy of admiration and respect. Giving children the opportunity to develop new resources, to enlarge their horizons and discover the pleasures of doing things on their own is, on the other hand, a way to help children develop a confident feeling about themselves as capable and interesting people.
Questions: (注意: 答题尽量简短，超过10个词要扣分，每条横线限定一个英语单词，标点符号不占格。)

Don’t Hesitate to Say “No”