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    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

    句意：如果我们不能创建一个污染越来越少的世界, 就永远不要期待有一片更蓝的天空。世界上独一无二的名词和一些抽象名词之前如果有形容词修饰, 可加不定冠词。如：a red sun一轮红日; a great success一次巨大的成功。

     

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