tt-gwd 2-40(以前没讨论过)

       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.

请问一下e是怎么推出来的谢谢

you can draw a diagram;

A small circle is representing the group of Asthma, and a much larger for the group of hey fever[according to fact 1: Asthma is much less common than hey fever]. the overlapped in between them represents those who suffer both.Then yoou can tell  the answer from reading the diagram.

For example, Asthma is 100, while hey fever is 1000. Then since over 95% of Asthma is suffering both, which is 95, the percentage of people suffering hey fever and asthma will be 95/1000. Isn't it true that it is less than 95%, which is stated in E?

Think about it, and you can make it.

I've got it!

thx so much