【題目】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】兩個(gè)空都是不可數(shù)名詞表示泛指，所以都用不定冠詞。句意：如果我們不創(chuàng)造一個(gè)環(huán)境污染更少的世界，我們就永遠(yuǎn)不能期望擁有一片更藍(lán)的天空。

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