7, Because natual gas is composed mostly of metrane,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 gasoline or diesel fuel.
E: less of certain pollutants than those burning gasoline or diesel fuel.
答案E
我解题如下:
主句如果不用比较级:vehicles powered by natural gas emit certain pollutants
vehicles powered by the burning of gasoline or diesel fuel emit certain pollutants 。
用比较级,根据白勇讲解,两句主语谓语相同可省略,保留做状语的介词短语或状语从句,所以认为选A呀,另外如果选Ethose指代的是谁呀???如果象我这样还愿回两个独立句子,第二句是什么呢?
vehicles是比较对象,those就是指vehicles。
比较可以省主语、谓语,但是如果补出,绝不能补错
还是不明白,如果those指代vehicles than后面句子也不通呀.
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