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
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(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。