单项选择题

We had to walk with ______ on that dangerous, icy slope.

A．caution
B．precaution
C．suspension
D．suspicion
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单项选择题
A ______ is a very infectious disease that spreads quickly and kills large numbers of people.
A．plague
B．outbreak
C．pledge
D．nightmare
单项选择题
I broke Mary' s pen by accident, and in ______ she tore up my school work.
A．retreat
B．reverse
C．revenue
D．revenge
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