OG13 新增题的106题 求解答 好心人来相助吧！

ljwqlcl881703

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.
答案C
将答案C取非  意思 不是这个学校的过敏的孩子愿意去校医院接受护理  也就是说外来数量使得这个比例增大 所以就不能说exposed to greater quantities of the chemicals 是这个原因  如果是这么理解的话  第一种情况能明白 但是第二种孩子对这个chemicals更为过敏 没法理解  
路过的牛牛帮帮忙 想不明白  求详细分析下正确选项C   
谢谢谢谢谢谢谢！！！！！！！！！！！！！！！！！！！！！！

ljwqlcl881703

补充下外加入的过敏孩子的原因导致了比例增大 就是说C即使取非了 也可以认为是孩子（学校的和学校外的孩子）对chemicals更为过敏的原因

ljwqlcl881703

发现被顶没了  我来顶下  另询问逻辑 那么长怎么在1分半内做完  看明白英文想通逻辑完全感觉不够啊！

ljwqlcl881703

来人求拯救爱！

拧发条喵

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.
现在和十年前比，过敏的送医率保持一致
取非：现在和十年前比，过敏的送医率提高/下降
就是保持外部条件一致啊……不懂你的问题@@

ljwqlcl881703

拧发条喵 发表于 2013-8-15 13:29
C. Children who have allergic reactions to the chemicals are not more likely to be sent to a school  ...

我理解的是这个比例的增加  是因为非此学校的过敏孩子跑到学校去看病了 并非学校内大量的chemicals导致过敏反应的孩子多了  基于这么理解  那也可以说 增加的的这个数是孩子们对chemicals更为敏感  

拧发条喵

ljwqlcl881703 发表于 2013-8-15 13:36
我理解的是这个比例的增加  是因为非此学校的过敏孩子跑到学校去看病了 并非学校内大量的chemicals导致过 ...

送医率是指发生过敏，然后被送到医院 与 全部发生过敏人数 的比率呀
更为敏感的话，是发病率发生变化

ljwqlcl881703

拧发条喵 发表于 2013-8-15 13:40
送医率是指发生过敏，然后被送到医院 与 全部发生过敏人数 的比率呀
更为敏感的话，是发病率发生变化 ...

晕了 那您能帮忙解释下 如果不排除C这个选项会出现什么情况 削弱了这个结论 = =！！！

拧发条喵

ljwqlcl881703 发表于 2013-8-15 13:49
晕了 那您能帮忙解释下 如果不排除C这个选项会出现什么情况 削弱了这个结论 = =！！！ ...

如果没有C条件，就可能是： 原来小孩生病大家都不愿意往医院送
现在在医院治过敏的小孩变多了，不一定是过敏的小孩增多了，而是原来不去医院的现在都上医院看病了
所以就不能怪什么化学物质太多……

ljwqlcl881703

拧发条喵 发表于 2013-8-15 13:51
如果没有C条件，就可能是： 原来小孩生病大家都不愿意往医院送
现在在医院治过敏的小孩变多了，不一定是 ...

原来是这么个意思................. 完全没想到这个点上去  谢谢！太感谢！！！