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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.
P: 花一定时间接触动物的动物园现职员中过敏比例为30%
C: 大众群体里花同样时间与动物接触的人的过敏比例远大于30%
A选项提供了能支持专家推论的两个群体的差异
B选项在”接触动物时间一样“的前提上做文章，属于无关选项
C和D都是无关选项
E选项是削弱项
动物园员工的过敏占比30%
总人口中的过敏总数超过30% ➡️ 给出此现象的成因（即 总人口 vs 动物园员工的不同）
A.employee的30%是是得了过敏症的人已经流出后的结果，可以认为是比自然感染率低了，所以general会更高
动物园工作人员深度患病者转换工作→动物园样本中不包含那些人
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。
B 削弱
C 无关，因为结论已经限定了总体
D 削弱
E 无关或微量削弱