费费上的一道题~

何小媛159753 · 发表于 2011-8-4 13:09:50

Although 90 percent of the population believes itself to be well inFORMed about health care, only 20 percent knows enough about DNA. So apparently at least 80 percent of the population does not know enough about medical concepts to make well-inFORMed personal medical choices or to make good public policy decisions about health care.
The argument’s reasoning is questionable because the argument fails to demonstrate that
(A) those people who can understand news stories about DNA are able to make well-inFORMed personal medical choices
(B) more than 20 percent of the population needs to be well inFORMed about health care for good public policy decisions about health care to be made
(C) one’s being able to make well-inFORMed personal medical choices ensures that one makes good public policy decisions about health care
(D) an understanding of DNA is essential to making well-inFORMed personal medical choices or to making good public policy decisions about health care
(E) since 90 percent of the population believes itself to be well inFORMed about health care, at least 70 percent of the population is mistaken in that belief.

答案是D，A和D 意思不是很相近吗~

izhuimeng · 发表于 2011-8-4 16:34:13

A 和 D 的意思不同。

题干要成立，必须有：those people who do not know enough about DNA definitely do not know enough about medical concepts to ...

D 选项实质上是其逆否命题，与之等价，正确。而 A 选项是其否命题，不一定正确。

另外，A 选项还有个小问题：understand news stories about DNA != know enough about DNA

费费上的一道题~

所属分类: GMAT考试

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