单项选择题

Bicycling and jogging are good exercise to train one’’s heart because they________.

A．require a lot of strength
B．are more interesting
C．can reduce one’’s weight
D．bring one’’s heartbeat to at least 120 a minute

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Bicycling and jogging are good exercise to train one’’s heart because they________. 您的浏览器不支持 audio 元素。