og16的90题 急求大神解释

峰叔叔的聪聪

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.   
答案是d。题目中的意思因为过敏而来看护士的人增多，但是选项d是说现在过敏的孩子不太可能像过去十年那样因为 过敏而去看护士，这不是反了吗？

峰叔叔的聪聪

steven 发表于 2016-10-16 11:20
高中数学“集合”中的一个概念。有印象了么？

嗷嗷嗷嗷！知道了！谢谢！

steven

峰叔叔的聪聪 发表于 2016-10-14 14:33
什么叫取非？

高中数学“集合”中的一个概念。有印象了么？

峰叔叔的聪聪

什么叫取非？

Fiona09

答案是C，不是D吧？

题干说因为过敏而来看护士的人增多，因此，要么是Renston学校的孩子已经比起10年前学校的孩子被暴露在了更大量的化学物质之中，要么就是他们这些孩子比起十年前的孩子更加对这种化学物质敏感。

问aaumption的话，应该先取非，再看有没有削弱论证。

C项取非后为“对于这种化学物质过敏的孩子比起十年前更加有可能被送到学校护理员那里”，这样一来，也就不能说明学校孩子被暴露在更大量的化学物质当中，也不能说明孩子们比起十年前更加对这种化学物质过敏，也就削弱了论证