Many experts seem to agree that certain limit should be set on consumption of cars to ea

问题补充：

Many experts 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; a

答案：

(答案→)A. a; the

B. /; the

C. the; /

D. the; a

解析：考查冠词。一定的限制a certain limit，consumption 后有定语修饰，是特指所以前加the。故选A。