题目内容

More often, the air in Hangzhou is dirty because of _____.
A．cornB．pollutionC．medicineD．temperature
B

试题分析：句意：因为污染，杭州的空气质量更经常地变差。because of因为，后跟名词，动名词，A.corn玉米 B.pollution 污染 C.medicine 药 D.temperature气温，空气因为污染变脏，故选B。
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