11. Wood smoke contains dangerous toxins that cause changes in human cells. Because wood smoke presents such a high health risk, legislation is needed to regulate the use of open-air fires and wood-burning stoves.
Which of the following, if true, provides the most support for the argument above?
(B) Within the jurisdiction covered by the proposed legislation, most heating and cooking is done with oil or natural gas.（为什么错了？）
(E) In valleys where wood is used as the primary heating fuel, the concentration of smoke results in poor air quality.（正确，为什么呢？）
谢谢~作者: mba2013 时间: 2012-5-14 21:48
(B) Within the jurisdiction covered by the proposed legislation, most
heating and cooking is done with oil or natural gas.
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既然大多数取暖是油汀或者天然气，那么焚木取暖的比例就小，那么即使不立法，
烧木头的情况也在少数，所以是weaken了argument。
(E) In valleys where wood is used as the primary heating fuel, the
concentration of smoke results in poor air quality.
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（题目已知）烧木头产生的烟有害，（E补充）焚木取暖是主要手段，会产生大量
