We can never expect ________ bluer sky unless we create ________ less polluted world.(2009·安徽)
A．a(chǎn)；aB．a(chǎn)；theC．the；aD．the；the
A
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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