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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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
单项选择题
Thank you for your invitation. I am looking forward to ______ your hometown.
A．visiting
B．being visited
C．visit
D．visiting at
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