1. 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）

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

答案是e

我看过注解了，版主不要让我看链接阿！

我想问是像网友曾说的 ：这里的比较是certain pollutants释放程度的多少，而不是pollutants种类的多少，所以用less

没有其他解释必须用fewer 不用less？谢谢！

没有其他解释必须用fewer 不用less？谢谢！

I think it is less relavent to consider fewer vs less for this particular problem. E is the ONLY optin that correctly compares VEHICLES with VEHICLES. All other 4 options either compare vehicles to fuels or doesn't make sense logically.

fewer修饰人

less修饰物

less>fewer