GWD-9-Q13请教NN

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?

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.

题中说既患 hay fever又患Asthma的人占Asthma人数的超过95%，求的是既患 hay fever又患Asthma的人占hay fever人数，由于题干已经告诉患Asthma的人远远少于患 hay fever的人，所以同样的分子，除于更大的分母，当然是少于95%