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 dont yet know why wild elephants seem to fare 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 dont get the same kind of exercise they would in the wild, and most are very fat. Elephant social lives 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 doesnt appear to be the case with elephants.

　　41 Unlike other animals in zoos, zoo-raised elephants

　　A live a long life

　　B give birth to many babies

　　C develop poor health

　　D have difficulty getting food

　　42 Which of the following about the international scientists study is NOT true?

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