全国职称英语考试综合类AB级课堂笔记34(3)
文章出处： 发布时间：2006-07-09
该句揭示文章标题的含义是“为了活下去而吃饭”
2． 直接解题：
1.According to the passage，which of the following is NOT true?
A)Eating less than usual might make us live longer．
B)If we go on a diet when old，we may keep healthy．
C)Dieting might not be needed．
D)We have to begin dieting from childhood．
1． D。分析：被题干不能给我们提供什么线索，借助文章的中心“为了活下去而吃饭”和刚才读到的句子判断D是答案。也可以参考被选项中出现的核心结构作为答案线索，这样找到答案相关句，判断D是答案。
A meager（不足的） diet may give you health and long 1ife（与A一致），but it’s not much fun—and it might not even be necessary（与C一致）．We may be able to hang on to most of that youthful vigor even if we don，t start to diet until old age．（与B一致）
2.Why does the author mention an elderly mouse in paragraph 2?
A)To describe the influence of old age on mice．
B)To illustrate the effect of meager food on mice．
C)To tell us how mice’s liver genes behave．
D)To inform us of the process of metabolizing (新陈代谢的)drugs．
2． B。分析：可以直接借助文章的主题“饮食和生命的关系”推测答案很可能是B。也可以借助文章中相关句子的语意判断答案。
Stephen Spindler and his colleagues from the University of California at Riverside have found that some of an elderly mouse’s liver genes can be made to behave as they did when the mouse was young simply by limiting its food for four weeks．The genetic rejuvenation won’t reverse other damage caused by time for the mouse，but could help its 1iver metabolize drugs or get rid of toxins（毒素）．
3.What can be inferred about completely normally fed mice mentioned in the passage?
A) They will not experience free radical production．
B) They will experience more genetic rejuvenation （恢复活力）in their lifetime．
C)They have more old liver genes to behave like young genes．
D)They are more likely to suffer from inflammation（炎症）．
3．D． 分析：借助题干中核心结构completely normally fed mice作为答案线索，并参考被选项中出现的核心结构，这样找到答案相关句：
Spindler’s team fed three mice a normal diet for their whole lives，and fed another three on half-rations。Three more mice were switched from the normal diet to half-feed for a month when they were 34 months old——equivalent to about 70 human years．
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