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】

A

【解析】考查冠詞辨析。你永遠別指望一個更加藍的天空除非我們創(chuàng)造一個更少污染的世界。兩個均為泛指。

 

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