单选题：TheauthormentionsallthefollowingwaysofdiseasepreventionEXCEP

题目内容：

TheauthormentionsallthefollowingwaysofdiseasepreventionEXCEPT__________. A．betterdiet
B．increasedexercise
C．lesssmoking
D．morefrequenthandwashing

参考答案：

答案解析：

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