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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.
情景：调查显示动物园雇员有30%概率被动物传染某种病。但这个例子中专家认为在和动物密切接触人中患病的概率要高于30%，问grounds。
答案预估：给的sample是30%，专家说要高于30%，那么依据应该是例子中的比例有所低估，找出能给出比例低估的选项即可。
A：得这种病的动物园雇员很可能换工作了。所以现在sample中其实少了一些得了重病换工作的人，所以这个比例是低估的。Correct。
B：动物园雇员比一般人更可能养一两只宠物，没有办法佐证。错误。
C：普通人中和动物接触程度类似动物园雇员的非常少，题目比较对象是接触程度=雇员的，质疑了题干的条件，错误。
D：和宠物接触与和动物园动物接触相比更不可能患病，那普通人患病比例应该低于30%，错误。
E：动物园雇员很少穿防护服，和比例被低估无关。错误。
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