单项选择题

At what age should people be introduced to jogging as an exercise

A．At puberty.
B．During childhood.
C．During adulthood.
D．During old age.
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单项选择题
How many adult Americans jog for exercise according to The National Adult Physical Fitness Survey
A．5.5 million.
B．6.5 million.
C．7.5 million.
D．8.5 million.
单项选择题
What is the best way to land on your feet at each step
A．On the heel of the foot.
B．On the toes.
C．Flat footed.
D．It is not indicated.
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