2. 职称考试
  3. Longer Lives for Wild Elephants Most people think of zoos as safe places ...

Longer Lives for Wild Elephants Most people think of zoos as safe places ...

admin2020-12-24  7
问题 Longer Lives for Wild Elephants  
Most people think of zoos as safe places for animals， where struggles such as having difficulty finding food and avoiding predators （猛兽） don’t exist. Without such problems, 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. Sometimes, they even become unable to have babies.
To learn more about how captivity （圈养）affects elephants，a team of international scientists compared the life spans of female elephants born in zoos with female elephants living outdoors in their native lands. Zoos keep detailed records of all the animals in their
care, documenting factors such as birth dates, illnesses, weight and death.. These records made it possible for the researchers to analyze 40 years of data on 800 African and Asian elephants in zoos across Europe. The scientists compared the life spans of the zoo-born female elephants with the life spans of thousands of wild female elephants in Africa and Asian elephants that work in logging camps （伐木场） ，over approximately the same time period.
The team found that female African elephants born in zoos lived an average of 16. 9 years. Their wild counterparts who died of natural causes lived an average of 56 years — more than three times as long. Female Asian elephants followed a similar pattern. In zoos, they lived 18. 9 years, while those in the logging camps lived 41. 7 years.
Scientists don’t know yet why wild elephants seem to get on so much better than their zoo-raised counterparts. Georgia Mason, a biologist at the University of Guelph in Canada who led the study, thinks stress and obesity （肥胖症） may be to blame. Zoo elephants
don’t get the same kind of exercise they would in the wild，and most are very fat. Social lives of elephants are also much different in zoos than in the wild, where they live in large herds and family groups.
The study raises some questions about acquiring more elephants to keep in zoos. While some threatened and endangered species living in zoos reproduce （生殖） successfully and maintain healthy populations, that doesnl appear to be the case with elephants.



It can be inferred from the last paragraph that
选项 A zoo-born elephants should be looked after more carefully.
B zoos should keep more animals except elephants.
C it may not be wise to keep elephants in zoos.
D elephants are no longer an endangered species.
答案C
解析文章最后一段主要讲述大象不适合动物园的生活，尤其是最后一句话that doesn’t appear to be the case with elephants.说明“那不适合大象的情况”。答案为C。
转载请注明原文地址:https://ti.zuoweng.com/ti/thlQKKKQ
相关试题推荐
随机试题