单项选择题

A．With an increase in the amount of blood.
B．With more muscles.
C．With vigorous trial.
D．With routine exercise.
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单项选择题
A．It becomes bigger.B．It becomes more expensive.C．It becomes cheaper.D．It becomes much safer.
A．It becomes bigger.
B．It becomes more expensive.
C．It becomes cheaper.
D．It becomes much safer.
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