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 first two stages in the development of civilized man were probably the invention of weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the ______.
A．latter
B．latest
C．later
D．last
单项选择题
It will take us twenty minutes to get to the railway station, ______ traffic delays.
A．acknowledge
B．affording
C．allowing for
D．accounting for
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