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.
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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.
单项选择题
Which of the following does jogging not do
A．Strengthen the breathing muscles.
B．Condition the heart.
C．Build strong shoulder muscles.
D．Promote a "training effect".
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