问题补充:
Most scientists seem to agree that certain limit should be set on consumption(消费) of cars to ease air pollution.
A. a; the
B. /; the
C. the; /
D. the; the
答案:
(答案→)A. a; the
B. /; the
C. the; /
D. the; the
解析:A 考察冠词。第一空a certain=some;第二空加定冠词表示特指。句义:许多科学家倾向于同意为了减轻空气污染,应该对汽车消费设定一些限制。