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
In the first 5 minutes of walking, you should walk ______.
A．slowly
B．quickly
C．at top speed
D．at medium pace
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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