单项选择题


A．with
B．for
C．owing to
D．as
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单项选择题
The deep-sea listening system makes use of ______
A．the sophisticated technology of focusing sounds under water
B．the capability of sound to travel at high speed
C．the unique property of layers of ocean water in transmitting sound
D．low-frequency sounds traveling across different layers of water
单项选择题
A．singleB．singularC．pluralD．compound
A．single
B．singular
C．plural
D．compound
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