题目内容
The danger of heart disease increases 20% for one hour a day spent watching televsion.
A. for B.to C.in D.by
D
考查介词的用法及含义。此处increase by意为:增加了……

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题目内容
The danger of heart disease increases 20% for one hour a day spent watching televsion.
A. for B.to C.in D.by
D
考查介词的用法及含义。此处increase by意为:增加了……