The people who‘re in their mid-70s only 0.45 percent ofcardiomyocytes____________.

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The people who‘re in their mid-70s, only 0.45 percent ofcardiomyocytes____________. 查看材料

A.are still functional

B.are replaced each year

C.are lost each year

D.are damaged each year

请帮忙给出正确答案和分析,谢谢!

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  • 正确答案:正确B
    细节题。题干:70多岁的人群中,只有0.45%的心脏细胞__________。利用题干关键词可以定位到短文的第四段,即一个人20岁时,其每年被更替的心肌细胞为1%。随着年龄的增长,该更替率不断下降,等到75岁时,只有0.45%。