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We can never expect bluer sky unless we ...

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】 试题分析:考查冠词。不定冠词a用于单数可数名词前,表示泛指,具有“一个”的意思。定冠词the用于各类名词前,表示特指,具有“这,那”的意思。第一空sky是指表示独一无二的事物的名词,由形容词修饰时可用不定冠词,a bluer sky一个更蓝的天空;第二空是不定冠词a用于单数可数名词前,表示(非特指的)一个。句意是我们永远不要盼望看到一个更蓝的天空,除非我们能创造一个较少污染的世界。故选A。 考点:考查冠词。
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