16. 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,用了less,那么是说pollutants是不可数名词,但是
676 Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system’s ability to deal with all other pollutants. 中,pollutant是可数名词
在朗文上查到说pollutant也是可数名词
请问16题中的pollutant是怎么回事呢? |