該句揭示文章標(biāo)題的含義是“為了活下去而吃飯”
2． 直接解題：
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：被題干不能給我們提供什么線索，借助文章的中心“為了活下去而吃飯”和剛才讀到的句子判斷D是答案。也可以參考被選項(xiàng)中出現(xiàn)的核心結(jié)構(gòu)作為答案線索，這樣找到答案相關(guān)句，判斷D是答案。
A meager（不足的） diet may give you health and long 1ife（與A一致），but it’s not much fun—and it might not even be necessary（與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．（與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 (新陳代謝的)drugs．
2． B。分析：可以直接借助文章的主題“飲食和生命的關(guān)系”推測(cè)答案很可能是B。也可以借助文章中相關(guān)句子的語(yǔ)意判斷答案。
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 （恢復(fù)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（炎癥）．
3．D． 分析：借助題干中核心結(jié)構(gòu)completely normally fed mice作為答案線索，并參考被選項(xiàng)中出現(xiàn)的核心結(jié)構(gòu)，這樣找到答案相關(guān)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．
2． 直接解題：
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：被題干不能給我們提供什么線索，借助文章的中心“為了活下去而吃飯”和剛才讀到的句子判斷D是答案。也可以參考被選項(xiàng)中出現(xiàn)的核心結(jié)構(gòu)作為答案線索，這樣找到答案相關(guān)句，判斷D是答案。
A meager（不足的） diet may give you health and long 1ife（與A一致），but it’s not much fun—and it might not even be necessary（與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．（與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 (新陳代謝的)drugs．
2． B。分析：可以直接借助文章的主題“飲食和生命的關(guān)系”推測(cè)答案很可能是B。也可以借助文章中相關(guān)句子的語(yǔ)意判斷答案。
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 （恢復(fù)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（炎癥）．
3．D． 分析：借助題干中核心結(jié)構(gòu)completely normally fed mice作為答案線索，并參考被選項(xiàng)中出現(xiàn)的核心結(jié)構(gòu)，這樣找到答案相關(guān)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．