GWD9-13

happypigfy

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?

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

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

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

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

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

这道题的答案似乎是选E，就没有搞明白，说是超过95%患A病的人都发烧，E的意思本来就不太明白，我的理解是发烧的人里面同时也患A病的比率小于95%，感觉上推不出来这个结论呢，所以我选的B，请各位NN们帮我解答一下，谢谢

longger

QUOTE:

以下是引用dbearwanger在2007-6-20 14:08:00的发言：
偶只是菜鸟，但是偶觉得画一个韦恩图就很明显了。注意：much less common

什么是韦恩图？

flamedream

QUOTE:

以下是引用chongfengxia在2007-6-22 15:27:00的发言：

much less common ailment

这题的重点在这里

can not agree more!

missdandan

前提：哮喘比干草热少见

有哮喘又有干草热的人/哮喘的人数大于等于95%

有干草热又有哮喘的人数/干草热的人数应小于95%

分母增大了嘛

dbearwanger

偶只是菜鸟，但是偶觉得画一个韦恩图就很明显了。注意：much less common