gwd-7-5

freesimens

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?

1. The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years.
2. Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.
3. 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.
4. The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston.
5. Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago.

answer is C, but i can't figure out the difference between B and C.

pls let me know.

sammen

B说这些孩子不比别的孩子更有可能对别得物质过敏,这个和文章没什么关系.

C说这些孩子不比别得还是更有可能背送去校医那里.取非,那么这些孩子更有可能背送去,我理解为身体更差,那么他们去可能是因为别得病,而不是因为过敏.所以weaken了.C本身得意思么是排除一个可能性,那么就是加强.我是这么理解得,希望有帮助.

apple1

B and C are clearly different.

B is not relevant to the original argument.

C, on the other hand, is an assumption of the original argument. Try

deny C, we get "Children who have allergic reactions to the chemicals

are more likely to be sent to a school nurse now than they were ten

years ago." If so, this could have caused most of the reported

increase by nurses, and the original argument that "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" would fall apart. So, C is an assuptiond the best

answer.