狒狒30

zowenny · 发表于 2010-1-20 11:40:22

30. Combustion of gasoline in automobile engines produces benzene, a known carcinogen. Environmentalists propose replacing gasoline with methanol, which does not produce significant quantities of benzene when burned. However, combustion of methanol produces formaldehyde, also a know carcinogen. Therefore the environmentalists’ proposal has little merit.

Which one of the following, if true, most supports the environmentalist’ proposal?

(A) The engines of some automobiles now on the road burn diesel fuel rather than gasoline.

(B) Several large research efforts are under way to formulate cleaner-burning types of gasoline.

(C) In some regions, the local economy is largely dependent on industries devoted to the production and distribution of automobile fuel.

(D) formaldehyde is a less potent carcinogen than benzene.

(E) Since methanol is water soluble, methanol spills are more damaging to the environment than gasoline spills.

答案选D 但感觉D反而是削弱了亚迷惑。。。

Christabel7 · 发表于 2010-1-20 20:59:53

咳,我觉得,这个意思是首先carcinogen是不好的,E提出用M换G,因为M放出B(一种carcinogen)较少.反对E的意见说但M还放出F(另一种carcinogen),所以这个的焦点就是F和B,选项D指出F比B的危害小,所以是加强
还可以排除来看,ABC都偏题,E削弱

zowenny · 发表于 2010-1-21 12:03:29

恩理解了。。。3Q！！

狒狒30

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