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  3. A proposed ordinance requires the installation in new homes of sprinklers automatically triggered by the presence of a fire. How

A proposed ordinance requires the installation in new homes of sprinklers automatically triggered by the presence of a fire. How

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问题 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?
选项 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、The largest proportion of property damage that results from residential fires is caused by fires that start when no household member is present.
答案E
解析 该住宅建筑商从关于绝大部分居室火灾的证据得出关于喷水装置在防止财产损失方面的有效性的结论，但这个论证是错误的，因为存在一种可能性，即大部分财产损失是由住宅建筑商的证据中排除的少量火灾引起的。如果(E)是正确的，这种可能性就会实现。因此，(E)是正确答案；因为建筑商的论述既与安装喷水装置的成本无关，也与消防部门的表现与其他地方的比较无关，选项(C)和(D)是无关选项；住宅建筑商引述的证据指出为了灭火正规训练[选项(A)]不是必需的；选项(B)支持建筑商的安装喷水装置只有有限效果的观点。
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