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标题: 不会做，求赐教啊 [打印本页]

作者: mengyuyang 时间: 2015-1-19 17:46
标题: 不会做，求赐教啊

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.

作者: francoisyang 时间: 2015-3-1 22:33
事实1：哮喘比花粉热少见；
事实2：超过95%有哮喘的人也有花粉热；
a,b都是定性描述，不分析了；
c没有哮喘也没有花粉热的人占总人口不到5%，显然错误，原文没提到过总人口；
d同时有两种病的人数大于只换一种的，错误，假设哮喘的100人，那同时患2种病的超过95人，但是患花粉热的可以是1000人；
e患花粉热的人里面同时患哮喘的低于患花粉热的95%，正确，假设哮喘100人，2种的95人，那根据事实1患花粉热的至少101人，95/101<95%

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