请教一道查不到相应题号的题

fuzhouguy

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 emplyee 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.

correct answer: E

How to reach the conclusion E?

Whitney

Premise 1: A ==> B (minor allergies) + C (Serious Allergies)

Premise 2: B+C = 30%

Assumption: a zoo emplyee who
develops a serious animal-induced allergy is very likely to switch to
some other occupation.

                    (The observed C is smaller than actually C)

Q: Which of the following hypotheses receives the strongest support from the information given? (Strengthen assumption)

Answer is : more than 30% peoples affected by allergy. (E)

fuzhouguy

还是不明白。

动物园员工犯病的比例是30%，怎么可以推断出动物园以外的人的犯病比例也是30%呢？没可能动物园以外的人的犯病比例远小于30%吗？

billytang1980

我开始也选错了，我选了B， 我想的是外面的人比动物园的人更能够感染过敏。但是我又仔细看了一下题目a zoo emplyee who develops a serious animal-induced allergy is very likely to switch to some other occupation.动物园的工作者更有可能把过敏感染给其他人，那么这句话就证明了外面的人比动物园工作人员更可能感染过敏。

选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动物园工作者更能够感染，是削弱

选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

 members of the general population 是指普通人群，它是大于30%的

不知道你懂了没有

fuzhouguy

我笨哪，还是没懂。

我翻译一下题目，看看有没有理解错。

题目说：和动物长时间接触的人会得过敏，其中很大一部分人症状严重。在一次对动物园员工的调查中，30%的人得过敏。然而，得了严重过敏的人非常可能会转行。（这跟容不容易感染过敏没有关系啊，更没提及传染啊）

我认为只有在：动物园员工之外的和动物接触的人得过敏的几率也是30% 这一前提条件下，E才有可能成立。可是我就是无法从原文得出这一前提条件。

所以困惑啊

dibert8

Consider the zoo as an unlimited source of people who had allergies. These people constantly left the zoo by changing jobs. Eventually, for the pool of people outside the zoo who have spent similar time with animals, the precentage of them to have allergies must be much higher than 30% because the zoo keep supplying to the pool people who have allergies.