求解一道GWD逻辑，拜谢！

tracy331677

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.A zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation.

B.A zoo employee is more likely than a person in the general population to keep one or more animal pets at home

C.The percentage of the general population whose level of exposure to animals matches that of a zoo employee is quite small.

D.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.

E.Zoo employees seldom wear protective gear when they handle animals in their care.
答案A。

tracy331677

基本上能理解了，可能当时我把general population里长时间与动物接触的人理解成所有人口了，所以觉得怎么可能超过30%。。。多谢楼上！

shencangbulu

结论是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.

我是这样想的,专家以现任动物园工作人员为样本,是30%过敏,而结论是更广泛的人群中,过敏的百分比是要大大超过30%的.那什么情况会导致这个呢.如果现任转行,这个portion就去了general population里面,然后动物园再招新人,再过敏,再转行出去,这样循环下去,那大范围的这个population过敏的比例就越来越高.

楼主你看下能理解么

tracy331677

好吧，谢谢！~

Leliolevine

是说很有可能转行。。有一部分可能转行。。当然不是全部都转行。。

tracy331677

确定是这么解释的吗？这样的话那动物园里的工作人员一旦过敏了就转行，岂不是动物园里过敏的工作人员比例会越来越小吗？。。。

Leliolevine

意思就是说，zoo里面的工作人员有一些患上过敏之后就转职业了，这样zoo的工作人员的患过敏的比例就减少了，所以比那些常年跟动物接触的普通人中患过敏的比例小阿。。