flaw题目。。。各种看不懂。。好心人来讲解~~~拜托啦~~

宝爱一

Certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs' airways to contract.This partially seals off the lungs.An asthma attack occurs when the messenger molecules are activated unnecessarily, in response to harmless things like pollen or household dust.

Which of the following, if true, points to the most serious flaw of a plan to develop a medication that would prevent asthma attacks by blocking receipt of any messages sent by the messenger molecules referred to above?

(A) Researchers do not yet know how the body produces the messenger molecules that trigger asthma attacks.

(B) Researchers do not yet know what makes one person's messenger molecules more easily activated than another's.
(C) Such a medication would not become available for several years, because of long lead times in both development and manufacture.

(D) Such a medication would be unable to distinguish between messages triggered by pollen and household dust and messages triggered by noxious air.

(E) Such a medication would be a preventative only and would be unable to alleviate an asthma attack once it had started.

这题真心没看懂。。求好心人讲解啊。。。

sdcar2010

Easy. D) is the answer.

The messenger molecules can be triggered by two mechnisms
1) noxious air (normal function)
2) harmless things such as pollen or dust (abnormal function)

If the new medication simply blocks the messenger all together, then when noxious air enters the airway of a person (which is harmful), there would not be any defence available in the lung.

Basically, you cannot throw away the baby with the bathwater.

宝爱一