(三)LongerLivesforWildElephants根据以下材料，回答问题。Mostpeoplethinkofzoosassafeplaces

共享题干题 (三)Longer Lives for Wild Elephants根据以下材料，回答问题。 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 (成熟的) 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 doesn't appear to be the case with elephants.1.[不定向选择题]One of the possible reasons for the zoo-raised elephants' problems is that __________ .A.they do not get proper food B.they do too much exercise C.they live in large herds D.they do not live in family groups. 2.[不定向选择题]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.

1.参考答案：D
参考解析：题干：对在动物园里生长的象出现的问题，下列哪项可能是原因之一?第五段主要讲述母性野象和动物园里生长的母象寿命差别的原因，可能是动物园里的母象运动量过少，因此D为正确选项。
2.参考答案：C
参考解析：题干：不同于动物园里的其他动物，大象__________。由文章第二段“科学家们发现在动物园里生长的大象身体状况不好”可知C为正确选项。3.[不定向选择题]Which of the following about the scientists' study is NOT true?A.They compared zoo-born elephants with wild elephants. B.They analyzed the records of 800 elephants kept in zoos. C.The zoo-bom elephants they studied were kept in European zoos. D.They kept detailed records of all the elephants in their care.

这个问题我还想问问老师呢