单项选择题

When we were in the mountains, we often found ourselves entirely enveloped by the fog.

A．confined
B．surrounded
C．darkened
D．blocked
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单项选择题
Cowries shells were once in widespread use as a token of value.
A．a symbol
B．an amount
C．a thing
D．an investment
单项选择题
Attitudes on the two sides in the Revolutionary War precluded the possibility of a peaceful solution.
A．presaged
B．prejudiced
C．anticipated
D．prevented
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