单项选择题

Water is a good ______ for transmitting sound.

A．medium
B．media
C．median
D．mediate
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单项选择题
The sergeant's orders were perfectly ______.
A．executed
B．exercised
C．developed
D．applied
单项选择题
International ______ will be reduced when this agreement is signed.
A．trend
B．twist
C．trail
D．tension
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