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
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
单项选择题
She took an umbrella with her this morning ______ she should be caught in the rain.
A．so that
B．in order that
C．in case
D．now that
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