单项选择题

A．Young people need more exercise than other people.
B．One can live longer than others if one has more exercise when one is young.
C．Adults need more exercise than children.
D．People can prolong their life span if they keep exercising.
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单项选择题
A．require a lot of strengthB．are more interestingC．can reduce one’s weightD．bring one’s heartbeat to at least 120 a minute
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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