单项选择题

According to the passage, walking is a simple way to ______ .

A．lose weight
B．cure blood diseases
C．avoid heart attacks
D．strengthen heart functions
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单项选择题
Which of the following is TRUE about the suggested walking program ______ .
A．effective walking lies in the gradual increase of speed
B．the same pace should be kept throughout the walking
C．one should not stop suddenly while walking fast
D．one should change one's walking pattern every 5 minutes
单项选择题
In the first 5 minutes of walking, you should walk ______ .
A．slowly
B．quickly
C．at top speed
D．at medium pace
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