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    精英家教网 > 高中英语 > 题目详情
    The air in mountain areas is ____ that in big cities.
    A．as fresh asB．fresher thanC．as dirty asD．dirtier than
    B
    此题考察形容词的比较级或原级。fresher than... 通常乡村的空气要比城市中的空气新鲜, 所以排除A,C, D选项, 虽然A选项本身结构是正确的。
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