根据材料，回答问题。EatMore,WeighLess,LiveLongerClevergeneticdetectiveworkmayhavefoun

共享题干题根据材料，回答问题。 Eat More, Weigh Less, Live Longer Clever genetic detective work may have found out the reason why a near starvation dietprolongs the life of many animals．Ronald Kahn at Harvard Medical School in Boston, US, and his colleagues have been ableto 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 not necessarily diet --promotes long life in "calorie (卡路里) 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 restrition 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, thoses 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 lived 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]The average modified mouse lived____A.3 year B.753 day C.More than 3 year D.887 day 2.[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 die C.Mice will go to heaven if they lose weigh D.Mice enjoy losing weigh

1.参考答案：D
参考解析：题干：那些基因改进过的老鼠活了____。?细节题。利用题目关键词s疵够和manufacturing company等可以定位到倒数第二段The average control mouse lived 753 days，while the thin rodents averaged a lifespan of887 days”，即“平均控制的老鼠活了753天，而那些瘦的则平均寿命达到887天”，所以正确答案为D。?
2.参考答案：A
参考解析：题干：第三段的最后一句隐含了什么??推断题。第三段的最后一句句子是“these mice eat all they want，lose weightand 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。?3.[不定向选择题]According to the passage, we do not know whether humans will benefit from takingin fewer calories partly because____A.humans, worms and rodents are different B.most people are not willing to be put on a strict diet C.the effect is not known D.genetic changes in tissues can not be performed on human

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