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:

本題考察冠詞的用法,因?yàn)閟ky和world原本是獨(dú)一無(wú)二的,但這里前面都有了形容詞修飾,表示會(huì)出現(xiàn)一個(gè)什么樣的sky和world,這里就屬于泛反指了

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