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

A. The; the B. /; the

C. A; the D. a; a

 

D

【解析】

試題分析：考查冠詞。句意：除非我們創(chuàng)造一個少一些污染的世界，否則我們永遠(yuǎn)不能期望得到一個更蔚藍(lán)的天空 。用不定冠詞表示泛指，a bluer sky一個更藍(lán)的天空，a less polluted world.一個少一點污染的世界，因此兩個空都用不定冠詞,故D正確。

考點：考查冠詞

 

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