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Most people regard zoos as safe places for animals, where struggles such as difficulty finding food and avoiding predators（捕食性動物） 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 develop diseases, joint problems and behavior changes. Sometimes, they even become unable to have babies.
To learn more about how captivity(監(jiān)禁) affects elephants, a team of international scientists led by Mason, a biologist, compared the life spans of female elephants born in zoos with female elephants living outdoors in the wild. 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 elephants in zoos.
The team found that female elephants born in zoos lived an average of 16.9 years. Their wild counterparts（同類事物） who died of natural causes lived an average of 56 years——more than three times as long.
Scientists don't yet know for sure why wild elephants seem to live so much better than their zoo-raised counterparts. Mason thinks stress and obesity(肥胖) may be to blame. Zoo elephants don't get the same kind of exercise as they do 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 groups.
Another finding from the study showed that elephants born in zoos were more likely to die earlier than elephants captured in the wild and brought to zoos. Mason suggests stress in the mothers in zoos might cause them to have babies that are less likely to survive.
The study raises some questions about acquiring more elephants to keep in zoos. While some threatened and endangered species living in zoos reproduce successfully and keep healthy populations, that doesn't appear to be the case with elephants.
小題1:The text tells us that zoo elephants are different from other zoo animals because they________
A．develop health problems.
B．1ive to a ripe old age.
C．are not afraid of predators.
D．have difficulty eating food.
小題2:What do the scientists find in their research?
A．Female elephants live longer than male elephants.
B．Female zoo elephants die earlier than their wild counterparts.
C．Female zoo elephants live longer than their wild counterparts.
D．Both elephants in zoos and those in the wild live in large herds.
小題3:Which of the following does the author suggest in the last paragraph?
A．Zoo-born elephants should be attended more carefully
B．Elephants are no longer an endangered species.
C．It may not be a wise policy to keep elephants in the zoo.
D．Zoos should keep more animals except elephants.
小題4:Which of the following can be the best title?
A．Comparison between two species of elephants
B．Longer lives for wild elephants
C．Female elephants suffer from poor health.
D．Longer lives for zoo animals.

小題1:A
小題2:B
小題3:C
小題4:B
文章通過討論動物園飼養(yǎng)的大象年齡比生活在野外的大象年齡要小得多。
小題1:A 細節(jié)題。根據(jù)第一段最后三行Scientists have known that elephants in zoos often develop diseases, joint problems and behavior changes. Sometimes, they even become unable to have babies. 可知在動物園里長大的大象會有很多健康方面的問題，故A正確。
小題2:B 根據(jù)文章第三段可知在野外生活的雌性大象要比在動物園里生活的雌性大象活的更久，甚至年齡要多了三倍，故B正確。
小題3:C 段落大意題。根據(jù)本段的主題句The study raises some questions about acquiring more elephants to keep in zoos.可知對于把大象養(yǎng)在動物園里的這種做法，作者持懷疑的態(tài)度，也許這不是一個很明智的做法，故C正確。
小題4:D 主旨大意題。文章通過討論動物園飼養(yǎng)的大象年齡比生活在野外的大象年齡要小得多。故D正確。
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C．The house prices in London has not fallen down.
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A．we can get enough resources without rainforests
B．there is great medicine potential in rainforests
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D．the level of annual rainfall affects wind patterns
小題5:What might be the best title for the text?
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