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We can never expect________bluer sky unless we create________less polluted world.
A.a; a   B.a; theC.the; aD.the; the
A

试题分析:考查冠词。第一空a泛指一个更为湛蓝的天空,第二空也是表示泛指,指一个更受污染的世界。故A正确。
点评:冠词的考查集中在定冠词the表示特指,不定冠词a/an表示泛指;以及冠词的一些特殊用法和固定词组,还有一些不使用冠词的情况,如抽象名词,物质名词前面就不要冠词。
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