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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单项选择题
When jogging, what should one not do with one' s eyes
A．Look ahead.
B．Look at one' s feet.
C．Blink.
D．Look to the side.
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