单项选择题

How can we reduce the risk of cancer

A．cut in
B．cut down
C．cut off
D．cut out
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单项选择题
It's prudent to take a thick coat in cold weather when you go out.
A．controversial
B．reasonable
C．sensible
D．sensitive
单项选择题
Are you positive that there's been no mistake
A．rational
B．reasonable
C．certain
D．bound
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