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题库 / GMATLA-CR-97
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.
背景： 和动物接触很多的人容易患上动物引起的过敏症状。在一项调查中，主要动物园的员工中有30%患有前文提到的过敏。
结论：在这个数据基础上，专家推断在广大群众中接触动物时间比较多的人中，有过敏症状的人要比30%更多。
问grounds就是问为什么普通人患过敏的人要更多？
A 动物园工作人员患过敏之后，ta会转行。这说明现在动物园调查的数据是偏少的，已经有一部分患病的工作人员变成了general public，如果不转行，这个数据会比30%要大。再类比，得出general public的过敏比例要大于30%。
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