题目

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: sky和world原本是独一无二的,但这里前面都有了形容词修饰,表示会出现一个什么样的sky和world,这里就属于泛反指了.  

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