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Exposure to certain chemicals commonly used in elementary schools as cleaners or pesticides causes allergic reactions in some children.  Elementary school nurses in Renston report that the proportion of schoolchildren sent to them for treatment of allergic reactions to those chemicals has increased significantly over the past ten years.  Therefore, either Renston’s schoolchildren have been exposed to greater quantities of the chemicals, or they are more sensitive to them than schoolchildren were ten years ago.

Which of the following is an assumption on which the argument depends?

 

A.      The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years.

B.       Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.

C.      Children who have allergic reactions to the chemicals are not more likely to be sent to a school nurse now than they were ten years ago.

D.      The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston.

E.       Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago.

请教一下这个题目为什么要选B,没想明白。

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这种题目要保证前提一致,就是说本来这种小孩子由于过敏送到医院的概率就是和现在一样的,你可以用取非的方法来考证.

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答案是C吧

B.Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.  无关选项

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C. ..... not more likely....  保持过去和现在在同一条件下... 有问题就送到护士.. 好像是这样...

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学校中的化学品会导致学生过敏, 护士报告和十年前相比,到校医室就诊的学生当中,患过敏症的比例提高了.得出结论-化学品增多了,或者是学生更敏感了.
A.护士人数, 无关
B.无关
C.正确.比例增加有可能是因为十年前学生过敏并不会到校医室就诊,是另一个可以解释现象的原因.
D.和学生无关.
E. 入学比例和就诊比例无关.

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