【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】句意:如果我們不創(chuàng)造一個環(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。兩個空都是不可數(shù)名詞表示泛指,所以都用不定冠詞,故選A。

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