求助：GWD 27-28

josefspy

People who have spent a lot of time in contact with animals often develop animal-induced allergies, a significant percentage of which are quite serious.  In a survey of current employees in major zoos, about 30 percent had animal-induced allergies.  However, a zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation.

Which of the following hypotheses receives the strongest support from the information given?

A.The incidence of serious animal-induced allergies among current zoo employees is lower than that among the 
    general population.
B.Zoo employees tend to develop animal-induced allergies that are more serious than those of other people who
   spend equally large amounts of time with animals.
C.Exposure to domestic pets is, on the whole, less likely to cause animal-induced allergy than is exposure to the
   kinds of animals that are kept in zoos.
D.There is no occupation for which the risk of developing an animal-induced allergy is higher than 30 percent.
E.Among members of the general population who have spent as much time with animals as zoo employees typically have, the percentage with animal-induced allergies is significantly more than 30 percent.

这题答案给E，为什麽对呢？我选D，因为既然动物园的人产生allergy就被转到其他occupation去，不就支持了D答案说没有其他职业产生动物过敏的风险高过於30%了吗？？

benja

觉得D太绝对，说不定有更危险的职业，但是饲养员不知道情况嘛

这一道题确实挺绕的。

qincong83

People who have spent a lot of time in contact with animals often develop animal-induced allergies, a significant percentage of which are quite serious.  In a survey of current employees in major zoos, about 30 percent had animal-induced allergies.  However, a zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation.重点在结论：有这种过敏症状的动物园员工会被调换工作。即：从事其他工作的人里面掺杂了这些感染了过敏症的动物园员工。
                

E：Among members of the general population who have spent as much time with animals as zoo employees typically have, the percentage with animal-induced allergies is significantly more than 30 percent.两点内容：1）其他人如果和动物园员工接触动物的时间一样长（这个assumption够严谨，即接触时间一样，要感染谁都感染，管他是动物园员工还是自己家养动物的人啊呵呵）  2）这些人感染过敏的比例大于30%。

 

So，因为动物园感染的员工被调职到其他occupation(工作，职业），在感染几率一样的前提下，由于得病的员工的加入，members of the general population感染比例肯定大于30%啦～～

[此贴子已经被作者于2007-10-8 18:55:27编辑过]