Q22

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.

我明白了，补充一下心得。

A. 原来所有的人（包括动物园人员）相同接触度引起过敏的比例都应该是一样的，当动物园里已经过敏的人跑到外边来之后，general population里会过敏的人比率就提高了，所以起支持作用。