A meager diet may give you health and
long life, but it’s not much fun—and it might not even be necessary. We may be
able to hang on to most of that youthful vigor even if we don’t start to diet
until old age. 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 liver metabolize drugs or get rid of toxins. 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. The A. (A) Eating less than usual might make us live longer. B. (B) If we go on a diet when old, we may keep healthy. C. (C) Dieting might not be needed. ~ D. (D) We have to begin dieting from childhood. [单项选择]A meager diet may give you health and long life, but it’s not much fun—and it might not even be necessary. We may be able to hang on to most of that youthful vigor even if we don’t start to diet until old age.
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 liver metabolize drugs or get rid of toxins. 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. The researchers checked the activity of 11,000 genes from the mouse livers, and found that 46 changed with age in the normally fed mic A. To describe the influence of old age on mice. B. To illustrate the effect of a meager diet on mice. C. To tell us how mice’s liver genes behave. D. To inform us of the process of metabolizing drugs. [单项选择]At some time in your life, you may have a strong desire to do something strange or terrible. However, chances are that you don’t act on your impulse, but let it pass instead. You know that to commit the action is wrong in some way and that other people will not accept your behavior.
Perhaps the most interesting thing about the phenomenon of taboo behavior is how it can change over the years within the same society, how certain behavior and attitude once considered taboo can become perfectly acceptable and natural at another point in time. Topics such as death, for example, were once considered so upsetting and unpleasant that it was a taboo to even talk about them. Now with the publication of important books such as On Death and Dying and Learning to Say Goodbye, people have become more aware of the importance of expressing feelings about death and, as a result, are more willing to tall about this taboo subject. One of the newest taboos in American society is the topic of A. their changed life style B. their eagerness to stay thin and youthful C. their appreciation of the importance of exercise D. the encouragement they have received from their companies 我来回答: 提交
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