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．More muscles than average people.B．A strong will.C．Strength, fitness and endurance.D．A strong heart.
A．More muscles than average people.
B．A strong will.
C．Strength, fitness and endurance.
D．A strong heart.
单项选择题
A．Because the fibers of his muscles are very thick.B．Because he has more muscles.C．Because his muscles are made of more stringy fibers.D．Because the number of his muscles was fixed during his childhood.
A．Because the fibers of his muscles are very thick.
B．Because he has more muscles.
C．Because his muscles are made of more stringy fibers.
D．Because the number of his muscles was fixed during his childhood.
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