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.
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