1. 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.

答案选d  a为什么错了  fails to demonstrate that 逻辑上的概念是说什么啊？是说作者的错误在于以下一个选项还是说如果以下的一个选项作好了就没错误了？

我觉得是不是that 表示的就是下面的选项！

A 里面好像多了New stories!

粗糙的翻译出来就是 90%的人认为自己清楚了解健康医疗知识，但只有20%的人足够了解DNA,所以得出结论：80%的人不够了解医疗知识去做个人医疗决定或是做公共医疗决定。

题目问得是结论有问题，是因为没有清楚解释哪一条？

在这里也就是问前提和结论之间差了哪座桥。即由“20%的人足够了解DNA”到“80%的人不够了解医疗知识去做个人医疗决定或是做公共医疗决定”的桥。这座桥应该就是不了解DNA的人（占了80%，因为足够了解的占了20%）就代表这些人不能做个人医疗决定或是做公共医疗决定，从而得出是D选项：是否了解DNA对于能否做个人医疗决定或是做公共医疗决定很关键。

翻译的很粗糙，你能理解么？

A is not enough

In the conclusion, there are to infinitive sturcture"to make well-informed personal medical choices or to make good public policy decisions about health care"

D is better which has invloved both factors