单选题Few foods are more alluring than chocolate. "Chocolate is a drug of abuse in its own category," jokes Dr. Louis Aronne. "It's ahnost as if people have chocolate receptors in their brains. " That may not be too far off the mark. In a recent book called "Breaking the Food Seduction," Dr. Neal Barnard contends that certain foods—including chocolate, cheese, red meat and practically anything combining sugar and fat—are just plain addictive. " It's not that you lack willpower. These foods stimulate the release of chemicals in the brain's pleasure center that keep you hooked. " Besides tapping the brain's own "feel good" chemicals, Barnard says, some of these foods contain drug-like molecules (分子) of of their own. Cheese delivers casomorphins, the same compounds in a mother's milk that help an infant bond during nursing, he says, but cheese is even more powerful, because it delivers casomorphins in an undiluted form. The result: "We're bonding to our refrigerators. " Other scientists doubt these drug-like compounds have enough force to make the foods addictive. But no one denies that fat and sugar exert a strong appeal. The brain is designed to reward eating and other behaviors that promote survival. And throughout history, with food relatively hard to come by, what prmnoted survival better than calorie-dense foods packed with fat and sugar? Besides, fat and sugar also calm the brain, lowering levels of stress hormones. "That's why we call them comfort foods," says physiologist Mary Dallman. But comfort is different from addiction. In classic addiction, the brain grows less sensitive to a pleasurable substance, and the addict requires higher and higher doses to derive the same rewards. Can food cause that kind of change? Perhaps. In a new study, Ann Kelley offered rats either plain water or a high-calorie chocolate drink. Over a two-week period, the animals drank more and more chocolate, but produced fewer brain opiates(镇静剂) in response. "You see the same thing in rats on morphine or heroin," she says. Admittedly, some foods can be hard to stop eating. But these foods are less habit-forming than alcohol—and most people can enjoy a drink without becoming alcoholic. The real problem today may be that we're constantly surrounded with food—and can't undo millions of years of evolution.

单选题Woman: You are burning the candle at both ends.Man: But I haven't saved enough for my retirement.Woman: What do you live for? Today or tomorrow?Question: What does the woman imply?

单选题A：Can you take over for me here for a little while? I have a friend coming to see me． B：I'd like to，but______Ask Peter，he's not so occupied at this moment．

单选题In recent years, Israeli consumers have grown more demanding as they've become wealthier and more worldly-wise. Foreign travel is a national passion; this summer alone, one in 10 citizens will go abroad. Exposed to higher standards of service elsewhere, Israelis are returning home expecting the same. American firms have also begun arriving in large numbers. Chains such as KFC, McDonald's and Pizza Hut are setting a new standard of customer service, using strict employee training and constant monitoring to ensure the friendliness of frontline staff. Even the American habit of telling departing customers to "Have a nice day" has caught on all over Israel. "Nobody wakes up in the morning and says, 'Let's be nicer, '" says Itsik Cohen, director of a consulting firm. "Nothing happens without competition. " Privatization, or the threat of it, is a motivation as well. Monopolies (垄断者) that until recently have been free to take their customers for granted now fear what Michael Perry, a marketing professor, calls "the revengeful (报复的) consumer. " When the government opened up competition with Bezaq, the phone company, its international branch lost 40% of its market share, even while offering competitive rates. Says Perry, "People wanted revenge for all the years of bad service. " The electric company, whose monopoly may be short-lived, has suddenly stopped requiring users to wait half a day for a repairman. Now, appointments are scheduled to the half-hour. The graceless ElAl Airlines, which is already at auction (拍卖), has retrained its employees to emphasize service and is boasting about the results in an ad campaign with the slogan, "You can feel the change in the air. " For the first time, praise outnumbers complaints on customer survey sheets.

单选题According to the author, a good driver should ______.

单选题(You'd better) hurry up (if) you want to buy (something) because there's hardly (nothing) left.

单选题Concern with money, and then more money, in order to buy the conveniences and luxuries of modern life, has brought great changes to the lives of most Frenchmen. More people are working than ever before in France. In the cities the traditional leisurely midday meal is disappearing. Offices, shops and factories are discovering the greater efficiency of a short lunch hour in company lunchrooms. In almost all lines of work emphasis now falls on ever-increasing output. Thus the “typical” Frenchman produces more, earns more, and buys more consumer goods than his counterpart of only a generation ago. He gains in creature comforts and ease of life. What he loses to some extent is his sense of personal uniqueness, or individuality. Some say that France has been Americanized. This is because the United States is a world symbol of the technological society and its consumer products. The so-called Americanization of France has its critics. They fear that "assembly-line life" will lead to the disappearance of the pleasures of the more graceful and leisurely old French style. What will happen, they ask, to taste, elegance, and the cultivation of the good things in life—to joy in the smell of a freshly picked apple, a stroll by the river, or just happy hours of conversation in a local cafe? Since the late 1950's life in France has indeed taken on qualities of rush, tension, and the pursuit of material gain. Some of the strongest critics of the new way of life are the young, especially university students. They are concerned with the future, and they fear that France is threatened by the triumph of the competitive, goods-oriented culture. Occasionally, they have reacted against the trend with considerable violence. In spite of the critics, however, countless Frenchmen are committed to keeping France in the forefront of the modern economic world. They find that the present life brings more rewards, conveniences, and pleasures than that of the past. They believe that a modern, industrial France is preferable to the old.

单选题Smoke particles and other air pollutants are often Utrapped/U in the atmosphere, thus forming dirty fog.

单选题Embroidery depicting scenic views became popular in the United States toward the end of the eighteenth century.

单选题I would like to express my ______ to you all for supporting me this summer as a visiting scholar in your department.

单选题{{B}}Passage Three{{/B}} Pictures in the British papers this week of Prince William, Prince Charles's 18-year-old son, cleaning toilets overseas, have led to a surge of altruism (利他主义). Raleigh International, the charity that organized his trip, has seen inquiries about voluntary work abroad rise by 30%. But the image of idealistic youth that William presents no longer reflects the reality of the volunteer force. It's getting older and older. Voluntary Service Overseas (VSO) has about 2,000 volunteers in the field around the world. After a dip in interest in the mid-1990s, applications to work abroad are at record levels. Last year 7, 645 people submitted applications, and 920 successfully negotiated the VSO selection process and were sent abroad. When the organization was founded in 1959, the average volunteer was in his early 20s. Now, the average age is 35, and set to rise further. Partly, that is because there are more older people who want to do VSO. More people take early retirement; more, says the chief executive of VSO, "still feel that they have more to give and are in good health". And the demands of the African and Asian countries where most of the volunteers go are changing, too. Their educational standards have risen over the past couple of decades, so they want people with more qualifications, skills and experience. BESO (British Executive Service Overseas) recruits executives and businessmen with at least 15 years' experience for short-term contract work overseas. It organizes 500 placements (工作安置) a year, and at the moment supply is surpassing demand. A BESO spokesman said that the organization is "limited by funding rather than a lack of volunteers". Enthusiastic but unqualified students do not impress as much as they once did alongside accountants, managers and doctors. The typical volunteer, these days, has been in full-time employment for at least five years and is highly qualified. And the profession which provides the biggest portion of volunteers is education—headmasters and school inspectors as well as classroom teachers.

单选题The Adult Vocational College is an opportunity to gain the right qualifications for various careers, for it offers an ______ range of subjects and courses.

单选题The parents of the bride ______ my presence at the wedding as we had been neighbors for years.

单选题Man: Prof. Johnson sure was acting strangely today. Woman: I noticed that too. He was talking so quietly and then not giving us any homework. Can you believe that? Question: What can be inferred about Prof. Johnson?

单选题In the months and years that followed as I Utransit/U the Northwest Passage, I came to accept such surprises as commonplace.

单选题Senior citizens are advised to {{U}}go in for{{/U}} some creative activities to keep themselves mentally young.