单选题：In people in their mid-70s, only 0.45 percent of cardiomyocy

题目分类：卫生类
题目类型：单选题
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题目内容：

In people in their mid-70s, only 0.45 percent of cardiomyocytes A．are still functiona
B．are reduced each yea
C．are replaced each yea
D．are damaged each yea

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