A．Those who have more leisure time.
B．Those who have heart attacks.
C．Those who have dangerous jobs.
D．Those who have inactive jobs.

A.Those
B.
B．Those
C.
C．Those
D.
D．Those

【参考答案】

D
解析：实细节题。文章最后一段第三句指出“In fact，many doctors encourage the......

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