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Because natural gas is composed mostly of methane, a simple hydrocarbon, vehicles powered by natural gas emit less of certain pollutants than the burning of gasoline or diesel fuel.

(A) less of certain pollutants than the burning of gasoline or diesel fuel

(B) fewer of certain pollutants than burning gasoline or diesel fuel do

(C) less of certain pollutants than gasoline or diesel fuel

(D) fewer of certain pollutants than does burning gasoline or diesel fuel            

(E) less of certain pollutants than those burning gasoline or diesel fuel

答案E。 可是我觉得E有问题。一是LESS THAN修饰可数名词， 二是没有DO接在

TAHN的后面。 我觉得答案没有一个对。

各位大侠的意见如何？

Less 可修饰可数/不可数

A emit less than B 可以不补

就象 I have more books than you .

其实比较最关键的是什么和什么比

上题 的比较是 vehicles powered by natural 和 those(vehicles ) burning gasoline or diesel fuel, 不是和burning 这个动作比较， 根据这一原则， 只有E 对。

你觉得呢？