Most people think of zoos as safe heavens for animals, where problems such as difficulty f

Most people think of zoos as safe heavens for animals, where problems such as difficulty finding food and avoiding predators (食肉动物) don’t exist. Therefore, animals in zoos should live to a ripe old age.
But that may not be true for the largest land animals on earth. Scientists have known that elephants in zoos often suffer from poor health. They develop diseases and they are even unable to have babies.
To learn more about how captivity (圈养) affects elephants, a team of international scientists compared the lifespans (寿命) of the zoo-born elephants with the lifespans of thousands of wild elephants. They also compared some Asian elephants living in zoos with some Asian elephants which work in logging camp (伐木场), over almost the same time period.
The team found that elephants born in zoos lived an average of 16.9 years, but elephants that died of natural causes lived an average of 56 years. Asian elephants followed a similar pattern. In zoos, they lived 18.9 years, while those in the logging camp lived 41.7 years.
Scientists don’t yet know why wild elephants seem to live so much better than their zoo-raised counterparts (同类). Georgia Mason, a biologist at the University of Guelph in Canada, who led the study, thinks stress and obesity (肥胖) may be to blame. Zoo elephants don’t get the same kind of exercise they would in the wild. Elephants’ social lives are also much different in zoos than in the wild, where they live in large family groups.
【小题1】Most people believe that .A．animals in zoos should live a longer lifeB．zoos are not good for animals to live inC．zoos are not suitable for large animalsD．captivity can affect animals in many ways【小题2】The purpose of the international scientists is .A．to compare the lifespans of different animalsB．to find out how captivity affects elephantsC．to learn the lifespans of male and female elephantsD．to compare the lifespans of elephants in different places【小题3】Which elephants live the longest according to the study?A．Elephants born in zoos.B．Elephants that live in the wild.C．Elephants that work in logging camps.D．Female Asian elephants in logging camps.【小题4】We can infer from the passage that .A．elephants in zoos suffer less stress than those in the wildB．elephants in zoos live an easy lifeC．social lives are not important to elephantsD．zoo life can be stressful to elephants【小题5】What are the advantages to elephants in the wild according to the passage?A．They face fewer problems.B．They can find food more easily.C．They live in large social groups.D．They are freer to move. A

(答案→)A 解析：【小题1】细节再现题。从文中第一段的最后一句可以找到答案。【小题2】细节再现题。从文中第三段的第1句中可以找到答案。【小题3】推理判断题。从文中第三段和第四段的信息可知，野外生长的大象寿命最长。【小题4】推理判断题。从文中最后一段可知压力和肥胖是造成大象寿命短的主要原因。【小题5】细节再现题。从文中第五段的最后一句可以找到答案。

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