请教大家一道逻辑题，谢谢~~

mayautumn86

Q40:

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.

Answer: E

为什么我觉得哪个都不对阿…… 画韦恩图表示是不确定的（我指得hay fever 在asthma患者中的比例）……请NN指点下！谢谢！

waterteller

应该是E：

原因如下：（逻辑图）

题干：两者都有的/得A的=95%，并且得H的多于得A的。

则两者都有的/得H的<95%(也就是答案E)

两者的分子一样，分母不同而已。

另注：画韦恩图的时候，记得把H的那个圈圈画的大一些（也是题干的意思），就一目了然了。

mayautumn86

阿拉，是这样！我忽略了得A的比得H的少这个条件！谢谢NN！