根据下列材料，回答题EatMore,WeighLess,LiveLongerClevergeneticdetectiveworkmayhavefoun

共享题干题根据下列材料，回答题 Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near starvation diet prolongs the life of many animals. Ronald Kahn at Harvard Medical School in Boston, US, and his colleagues have been able to extend the lifespan (寿命,) of mice by 18 per cent by blocking the rodent's (啮齿动物) increase of fat in specific cells. This suggests that thinness -- and hot necessarily diet--promotes long life in " calorie (热量卡) restricted" animals. "It's very cool work. " says aging researcher Cynthia Kenyon of the University of California, San Francisco. "These mice eat all they want, lose weight and live longer. It's like heaven. " Calorie restriction dramatically extends the lifespan of organisms as different as worms and rodents. Whether this works in humans is still unknown, partly because few people are willing to submit to such a strict diet. But many researchers hope they will be able to trigger the same effect with a drug once they understand how less food leads to a longer life．One theory is that eating less reduces the increase of harmful things that can damage cells. But Kahn's team wondered whether the animals simply benefit by becoming thin.To find out, they used biology tricks to disrupt the insulin (胰岛素) receptor (受体) gene in lab mice--but only in their fat cells. "Since insulin is needed to help fat cells store fat, these animals were protected against becoming fat," explains Kahn. This slight genetic change in a single tissue had dramatic effects. By three months of age, Kahn，those modified mice had up to 70 per cent less body fat than normal control mice，despite the fact that they ate 55 per cent more food per gram of body weight．In addition．Their lifespan increaseD、The average control mouse rived 753 days，while the thin rodents averaged a lifespan of 887 days．After three years，all the control mice had died，but one—quarter of the modified rodents were still alive． “That they get these effects by just manipulating the fat cells is controversial，”says Leonard Guarente of the Massachusetts Institute of Technology，who studies calorie restriction and aging．But Guarente says Kahn has yet to prove that the same effect is responsible for increased lifespan in calorie．restricted animals．“It might be the same effect or there might be two routes to long life，”he points out，“and that would be very interesting．” 1.[不定向选择题]What does the last sentence in the third paragraph imply?A.People like to lose weight，but they do not like to eat le B.People want to go to heaven.but they do not want to di C.Mice will go to heaven if they lose weigh D.Mice enjoy losing weight.? 2.[不定向选择题]What can be inferred from the passage about the route to long life?A.It remains to be studieD、? B.It has already been discovere C.Eating more leads to long lif D.Eating less leads to long lif

1.参考答案：A
参考解析：第三段的最后一句隐含了什么?A、人们喜欢减肥，但不喜欢少吃。B、人们想去天堂，但是不愿意死。C、老鼠如果减肥就可以进天堂。D、老鼠喜欢减肥。?推断题。第三段的最后一个句子是“these mice eat all they want，lose weight and live longer．It’s like heaven”，即“这些老鼠可以敞开吃，不会发胖，还能长寿。这就像进入天堂一样。”这实际上是道出了人的心声，由此答案为A。?
2.参考答案：A
参考解析：从短文关于长寿的方法可以推断出什么?A、仍有待研究。?B、已经被发现。C、多吃会长寿。?D、少吃会长寿。?推断题。从文章的最后两段我们可以感到对Kahn的试验，同行中是有不同意见的，至少到目前为止还不能说已经找到了延长寿命的方法，由此推断答案为A。3.[不定向选择题]Ronald Kahn and his colleagues can make mice live longer by_________．A.offering them less food B.giving them a balanced diet C.disrupting the specific genes in their fat cell D.preventing them growing larger

我明天再问问老师，叫他解释下这个问题