The Sarch for the Anti-·aging Pill单词分析.docVIP

READING PASSAGE 3 You should spend about 20 minutes on Questions 28—40, which are based on Reading Passage 3 The Search for the Anti-·aging Pill In government laboratories and elsewhere, scientists are seeking a drug able to prolong life and youthful vigor．Studies of caloric restriction are showing the way. As researchers on aging noted recently, no treatment on the market today has been proved to slow human aging—the build-up of molecular1 and cellular2 damage that increases vulnerability3 to infirmity as we grow older．But one intervention4，consumption5 of a low-calorie*yet nutritionally 6balanced diet．works incredibly well in a broad range of animals，increasing longevity7 and prolonging good health．Those findings suggest that caloric restriction8 could delay aging and increase longevity in humans, too． Unfortunately, for maximum benefit，people would probably have to reduce their caloric intake by roughly thirty per cent，equivalent9 to dropping from 2,500 calories a day to l,750．Few mortals10 could stick to that harsh a regimen11，especially for years on end．But what if someone could create a pill that mimicked12 the physiological effects of eating less without actually forcing people to eat less? Could such a‘ caloric-restriction mimetic13’，as we call it，enable people to stay healthy longer, postponing14 age-related disorders(such as diabetes15，arteriosclerosis16，heart disease and cancer)until very late in life? Scientists first posed this question in the mid-1 990s．after researchers came upon a chemical agent that in rodents17 １adj. [化学] 分子的；由分子组成的　2 n. 移动电话；单元adj. 细胞的；多孔的；由细胞组成的 3 n. 易损性；弱点 4 n. 介入；调停；妨碍 5 n. 消费；消耗；肺痨 6 adv. 滋养地 7 n. 长寿，长命；寿命 8 n. 限制；约束；束缚 9 n. 等价物，相等物 adj. 等价的，相等的；同意义的 10 adj. 凡人的；致死的；终有一死的；不共戴天的n. 人类，凡人 11 n. [医] 养生法；生活规则；政体；支配 12 v. 模仿（活象） 13 adj. 模仿的；拟态的；类似的 14 n. 推迟 15 n. 糖尿病；多尿症 16动脉硬化 17 n. 啮齿动物 seemed to reproduce many of caloric restrictions benefits．No compound that would safely achieve the same feat in people has been found yet，b