[讨论]GWD2-40

linyqiong

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.

答案很明显只能选E，

可是这边E选项是不是没有说清楚是people suffering from hay fever who also have asthma 在哪个群体中的比例？该怎么理解呢？

[此贴子已经被作者于2009-2-19 23:49:53编辑过]

NOmoreTears

多读几遍就知道了 E只是原文换一种表述 但是跟原文相反 原文超过95% E项说低于95%

祝好运！

linyqiong

先谢谢了，我可能没有问清楚。

Over 95 percent of people who have asthma also suffer from hay fever这句话我理解：子集是患asthma和患hay fever的人，全集是asthma的人，子集在全集中占95%以上

可是这句话The percentage of people suffering from hay fever who also have asthma is lower than 95 percent.子集是患asthma和患hay fever的人，全集是什么貌似没有表达出来，是不吗？

[此贴子已经被作者于2009-2-19 23:58:09编辑过]

NOmoreTears

你想的太多了 也高估了美国人的数学水平   

“Over 95 percent of people who have asthma also suffer from hay fever这句话我理解：子集是患asthma和患hay fever的人，全集是asthma的人，子集在全集中占95%以上”

事实上两种病是平行关系 不是从属关系 也就是说 两种病都是全集 它们的交集是95%+

hansomecd

asthma&hay fever                                                                    asthma&hay fever

________________  > 95%    +  anthma<<hey fever  =>      ________________  < 95%

 asthma only                                                                                      hey fever

[此贴子已经被作者于2009-2-21 23:26:25编辑过]

linyqiong

谢谢