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【单选题】

The author mentions that the maximum THR for older adult participants in sports should be less than ______ beats per minute.

A.60
B.120
C.180
D.240
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根据网考网移动考试中心的统计,该试题:

6%的考友选择了A选项

50%的考友选择了B选项

28%的考友选择了C选项

16%的考友选择了D选项

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