Proper exercise is good for your health._____, too much is bad for it. A. Therefore   

Proper exercise is good for your health._____, too much is bad for it.

A. Therefore      B. But         C.However       D. while

答案

C


解析:

考查副词的用法。由空格后的逗号看出,此处需要一个副词,依据句意表转折,故选C;but和while都是连词。

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