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1997年3月上海市高級口譯筆試真題

時間:2005-10-4 0:05:59  作者:alex 鍙彲鑻辮-騫磋交浜虹殑鑻辮鍚璁粌騫沖彴
    The hormone, which the Arizona researchers have dubbed Melano-Tan, is a chemical variation (or analog) of the melanocyte-stimulating hormone (MSH) that some animals, such as frogs or chameleons, secrete from their pituitary glands, causing them to change color. It was discovered as part of a U.S. government-sponsored study of ways of reverse or cure vitiligo. "In the process of these studies," says Mac Hadley, an endocrinologist at the University of Arizona, "we discovered that if this molecule was delivered across the skin of a certain strain of mice, the skin would turn dark brown. And not just where we placed the chemical, but all over." What's more, says Hadley, another research center has just demonstrated that the hormone will cause in vitro human skin to tan as well, "which is pretty close to saying this product will work."
    If Melano-Tan becomes commercially available--and a large American pharmaceutical company is now funding studies toward that end--it could be taken orally or applied topically. After application. it would enter the bloodstream and systematically tan the entire body. Depending on the concentration, initial tanning would begin in two or three days and a dark, uniform tan could be achieved within two weeks. When the hormone is no longer applied, the tanned skin could be peeled off. There are already tanning pills on the market, such as French Bronze Tablets (with carotene), but Hadley dismisses them as "gimmicks" that merely dye the skin unevenly, like Easter eggs.
    According to Hadley, Melano-Tan could lower the incidence of skin cancer by allowing fair-skinned people to tan before going out in the sun. It could also help those who suffer from vitiligo or hyperpigmentation, and those who are allergic to sun screens.
4. What are the disadvantages of tanning in the sun or in a tanning salon?
5. In what other ways can the synthetic peptide hormone be useful to people apart from acquiring a tan?
6. How will the hormone work when taken orally or applied topically?

Questions 7~10
    IF VITAMIN C is good for you, does more mean better? Millions of people think so but scientists have been divided on the issue. Despite a huge research effort, there is little evidence that megadoses of vitamin C, up to 100 times the recommended daily amounts, have beneficial effects.
    Now an American scientist has come up with an explanation of the lack of effect--and a simple remedy. Millions of Americans take supplements of the vitamin in the belief that its anti-oxidant properties help prevent heart disease, cancer and the ageing process. Most of it, however, goes straight down the pan: the body cannot deal with excess vitamin C, which is rapidly excreted. Even large doses are eliminated in 12 hours and slow-release ones in 16.
    The way to keep blood levels of the vitamin continuously high, according to Roc

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