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
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
单项选择题
It rained hard yesterday, _____ prevented me from going to the park.
A．that
B．which
C．as
D．it
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