囧哥做语法67

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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

考察fewer和less的区别，以及比较
这里是pollutants排放量的比较，所以用less 不用fewer。所以BD错
A 比较对象不对，pollutants和burning比较
C 是pollutants和gasoline的比较
E those指代前面的vehicles，是不同车排放量的比较
技巧：关于fewer和less的区别，一个是修饰具体的，一个是修饰抽象的，而单纯的按照可数和不可数，在很多时候不好区分的。