We can never expect bluer sky unless we create less polluted world.A. a; aB. a; theC. the

问题补充：

We can never expect bluer sky unless we create less polluted world.

A. a; a

B. a; the

C. the; a

D. the; the

答案：

(答案→)A. a; a

B. a; the

C. the; a

D. the; the

解析：考查冠词辨析。你永远别指望一个更加蓝的天空除非我们创造一个更少污染的世界。两个均为泛指。

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