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

A. a, a B. a, the C.the, a D. the, the

A

【解析】

試題分析：考查冠詞用法。句意：除非我們創(chuàng)造一個很少被污染的世界，否則我們決不要期望一個更藍的天空了。此句中sky與world前都有形容詞bluer，polluted修飾，由此可知，屬于泛指表示一個……，且unless 前后的句子，表達意思屬一致，故選A。

考點：考查冠詞用法。

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