阅读理解Mostpeoplethinkofzoosassafeh

阅读理解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 pared the lifespans (寿命) of the zoo-born elephants with the lifespans of thousands of wild elephants. They also pared 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.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 ways2.The purpose of the international scientists is_________.A.to pare the lifespans of different animalsB.to find out how captivity affects elephantsC.to learn the lifespans of male and female elephantsD.to pare the lifespans of elephants in different places3.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.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 elephants5.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.