Proper exercise is good for your health._____, too much is bad for it.
A．ThereforeB．ButC．HoweverD．while
C
考查副詞的用法。由空格后的逗號(hào)看出，此處需要一個(gè)副詞，依據(jù)句意表轉(zhuǎn)折，故選C；but和while都是連詞。
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