单项选择题

During the past years, most working women took vacation ______ .

A．by car
B．by bike
C．by air
D．on foot
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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
Compared with running the same distance, walking in the recommended way burns ______ .
A．fewer calories
B．more calories
C．a fixed number of calories
D．the same number of calories
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