求教GWD-9-13(好像没有讨论过)

monabluestone · 发表于 2006-6-4 18:50:00

GWD-9-Q13:

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?

Hay fever is a prerequisite for the development of asthma
Asthma is a prerequisite for the development of hay fever
Those who have neither hay fever nor asthma comprise less than 5 percent of the total population
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.

答案为E,我选B. 不明白，请那位高人指点一下。谢谢！！！

wycg · 发表于 2006-6-4 22:35:00

这道题前人有过讨论.楼主在GWD讨论连接里搜一下.(注意:GWD13套里有重题,可能给的连接号不是这套题里的.你可以先在GWD13套里搜到题号,再去讨论连接里搜)

[此贴子已经被作者于2006-6-4 22:35:54编辑过]

monabluestone · 发表于 2006-6-6 17:59:00

wycg版主,我用的是xy无重复版,里面的题号有误不是GWD-9-13而是GWD-19-13同GWD-18-15,可以收到.希望加到讨论连接里,一遍大家好找.

sunjie38 · 发表于 2006-6-6 19:16:00

画个韦氏图就知道了

两者相交处假设为95, 有A无H的有5, 而题目说A<H,所以有H无A的大于5,假设为6,

所以

95/(95+6)<95%

monabluestone · 发表于 2006-6-6 21:57:00

很形象，现在明白了，谢谢sunjie38！

sunjie38 · 发表于 2006-6-7 08:49:00

阿土莎莎 · 发表于 2007-11-22 14:27:00

kongkong57 · 发表于 2009-7-17 11:03:00

TONGWEN