[求助]OG 18

18. A proposed ordinance requires the installation in new
homes of sprinklers automatically triggered by the presence of a fire. However,
a home builder argued that because more than ninety percent of residential
fires are extinguished by a household member, residential sprinklers would only
marginally decrease property damage caused by residential fires.

Which of the following, if true, would most seriously
weaken the home builder’s argument?

A. most individuals have no formal training in how to
extinguish fires.

B. Since new homes are only a tiny percentage of
available housing in the city, the new ordinance would be
        extremely narrow in scope.

C. The installation of smoke detectors in new residences
costs significantly less than the installation of sprinklers.

D. In the city where the ordinance was proposed, the
average time required by the fire department to respond to a fire was less than
the national average.
            E

因为90%的火灾都被household member扑灭，所以residential sprinklers只能很小程度的降低火灾带来的财产损失。

E、很大程度的财产损失都是由于火灾发生在没人在家的时侯引发的。10%那部分没有被household member扑灭（不在家）的火灾足以造成很大程度的损失，“只能很小程度的降低火灾”不成立。

读题时尽量判断哪些信息是key，就可以用相关无关排出。如这题就是说：火灾怎么怎么样，所以财产怎么怎么样。答案的特征一定是包含火灾和财产的关系。