The air in mountain areas is ____ that in big cities.
A．a(chǎn)s fresh asB．fresher thanC．a(chǎn)s dirty asD．dirtier than
B
此題考察形容詞的比較級或原級。fresher than... 通常鄉(xiāng)村的空氣要比城市中的空氣新鮮, 所以排除A,C, D選項(xiàng), 雖然A選項(xiàng)本身結(jié)構(gòu)是正確的。
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