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标题: GWD7-Q5 [打印本页]

作者: laurawang2234    时间: 2010-10-20 06:54     标题: GWD7-Q5

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。
作者: 卮言浅夏    时间: 2010-10-20 21:35

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.
作者: fankser    时间: 2010-10-21 06:39

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

作者: zhangluE    时间: 2010-10-21 21:22

why answer is C?
I am confused...
作者: liexodus    时间: 2010-10-22 06:39

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...
作者: brunhildS    时间: 2010-10-22 20:47

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.
作者: weixuan    时间: 2010-10-23 06:40

ls的C选项说法理解错了,不是说十年前不会去医院就诊,而是说就诊的情况是一样的。
下面我从别的地方找到的解释
一些化学试剂在小学校里被当成清洁剂或者杀虫剂使用造成了一些孩子的过敏反应。在R的小学的护士说孩子过敏之后被送去治疗的比例在过去十年上升了。因此,要不就是因为孩子被暴露在更大数量的化学试剂下,要不就是因为现在的孩子比之前的孩子敏感。----C答案:对化学试剂过敏的孩子现在不会比之前的孩子更可能送去校医院治疗。即排除了一种导致护士说的结果的另外一种可能性:过去的孩子实际过敏人数和现在没差多少,但是他们中有不少人没有去就医。




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