单项选择题

We used to swim in this lake, but now it is seriously ______.

A．contemplated
B．contrived
C．corrupted
D．contaminated
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单项选择题
It was a lovely day so we decided to ______ in the park for an hour.
A．stroll
B．stray
C．stagger
D．stumble
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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