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LongerLivesforWildElephantsMostpeoplethinkofzoosassafeplacesforanimals,wherestrugglessuchasdifficultyfindingfoodandavoidingpredatorsdon'texist.Withoutsuchproblems,animalsinzoosshouldlivetoaripeoldage.Buttha
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Longer Lives for Wild Elephants

Most people think of zoos as safe places for animals,where struggles such as difficulty finding food and avoiding predators 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.They develop diseases,joint problems and behavior changes.Sometimes,they even become unable to have babies.

To learn more about how captivity(监禁) 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 40years of data on 800African and Asian elephants in zoos across Europe.The scientists compared the life spans of the zoo-born elephants with the life spans of thousands of female wild 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 16.9years.Their wild counterparts who died of natural causes lived an average of 56years--more than three times as long.Female Asian elephants followed a similar pattern.In zoos,they lived 18.9years,while those in the logging camps lived 41.7years.

Scientists don't yet know why wild elephants seem to live 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) may be to blame.Zoo elephants don't 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 g

李传荣回答:
  72.D细节理解题.根据第二段Scientistshaveknownthatelephantsinzoosoftensufferfrompoorhealth.可知科学家们已经发现动物园内的大象面临着很多的健康问题.故选D.   73.B细节理解题.根据第三段Zooskeepdetailedrecordsofalltheanimalsintheircare,可知动物园保留了所有动物的详细记录,而不是科学家.故选B.   74.C推理判断题.根据第六段Scientistsdon'tyetknowwhywildelephantsseemtolivesomuchbetterthantheirzoo-raisedcounterparts.可知科学家们还不知道野生象为什么会比动物园饲养的象活得更好.由此推知,科学家们发现动物园的雌象会比野生象死得更早.故选C.   75.A细节推断题.根据最后一段Thestudyraisessomequestionsaboutacquiringmoreelephantstokeepinzoos.Whilesomethreatenedandendangeredspecieslivinginzoosreproducesuccessfullyandmaintainhealthypopulations,thatdoesn'tappeartobethecasewithelephants.可知该项研究提出了是否应该把更多的大象关在动物园内的问题.虽然一些受威胁和濒危的物种在动物园里生活,成功的繁殖了后代而且很健康,但似乎大象并非如此.由此推知,把大象养在动物园里或许是不明智的.故选A.
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