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题库 / GMATLA-CR-92
People who have spent a lot of time in contact with animals often develop animal-induced allergies, some of them quite serious. In a survey of current employees in major zoos, about 30 percent had animal-induced allergies. Based on this sample, experts conclude that among members of the general population who have spent a similarly large amount of time in close contact with animals, the percentage with animal-induced allergies is not 30 percent but substantially more.
Which of the following, if true, provides the strongest grounds for the experts' conclusion?
A zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation.
A zoo employee is more likely than a person in the general population to keep one or more animal pets at home
The percentage of the general population whose level of exposure to animals matches that of a zoo employee is quite small.
Exposure to domestic pets is, on the whole, less likely to cause animal-induced allergy than exposure to many of the animals kept in zoos.
Zoo employees seldom wear protective gear when they handle animals in their care.
可以有两个思路，一是从找动物园员工和普通人之间的不同着手，而是找30%这个比例本身是不是有问题着手。
B：只会导致动物园员工患病比例高于普通人---与结论相反了
C：也是导致普通人患病比例更低。
D：更可能导致普通人的患病比例低
E：动物园员工患病的原因，与题目无关
A：动物园患病员工就会离职---则现在调查到的患病比例是不正确的，是被低估的，（而患病员工进入社会成为普通大众中的一员，进一步增加了普通大众中患病者的基数）所以可能普通大众的患病比例会比30%高。
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