求问GWD18-15

Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages

Fact:Over 95 percent of people who have asthma also suffer from hay fever.

If the information given as facts above is true, which of the following must also be true?

A.Hay fever is a prerequisite for the development of asthma.

B.Asthma is a prerequisite for the development of hay fever.

C.
            Those who have neither hay fever nor asthma comprise less than 5 percent of the total population.

D.
            The number of people who have both of these ailments is greater than the number of people who have only one of them.

E.The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.

我觉得应该选A，为什么会是E？请NN解释一下，如果画图，范围怎么看呢？

这道题以前的讨论我看了，竟然讨论到12题了，15题根本没说！晕！

A.Hay fever is a prerequisite for the development of asthma.

A is not correct because only 95% of the people who suffer asthma also have hay fever. If the number is 100%, then hay fever is a preequisite.

E is correct, please pay attention to the key words:

is much less common ailment than hay fever

就是当MATH来进行画图

有A，其中单独有a的占95%，，有f的〉有a的，但是BOTH a and F的人数是一样的

(A&F)/A=95%

因为F>A,所以（A&F)/F<95%

十分到位的逻辑，呵呵

这种数学题总是做不好,顶一个