单项选择题

When he was waken by some strange noise, he found himself, to his astonishment, surrounded by a ______ of wolves.

A．herd
B．school
C．flock
D．pack
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单项选择题
The water in the pool is as ______ as a mirror.
A．smooth
B．flush
C．plane
D．even
单项选择题
He ______ to newsmen that an immediate agreement was nowhere in sight.
A．receded
B．conceded
C．acceded
D．preceded
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