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164.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

Key:E
我的问题是其中pollutants复数，应为可数名词，为什么用less不用fewer呢？

snow_mountain

因为这里less 其实不是修饰pollutants的。 这里的意思其实是 emit less (**) of certain pollutants.