Most scientists seem to agree that certain limit should be set on consumption of cars to ease air pollution．
A. a; the
B. /;the
C. the; /
D. the; the
网友回答
(答案→)A. a; the
B. /;the
C. the; /
D. the; the
解析：考察冠词用法。第一空表示泛指，a certain limit相当于some limit意为某种限制， 第二空是特指，特指车辆的消费，
句意为，大部分科学家似乎都同意应当对汽车的消费设定某种限制，为了减轻空气污染。