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
I think you can take a(n) ______ language course to improve your English.
A．intermediate
B．middle
C．medium
D．mid
单项选择题
At three thousand feet, wide plains begin to appear, and there is never a moment when some distant mountain is not ______.
A．on view
B．at a glance
C．on the scene
D．in sight
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