单项选择题


A．the others
B．all others
C．these
D．those
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单项选择题
A．withB．forC．owing toD．as
A．with
B．for
C．owing to
D．as
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
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