单项选择题

Where are the speakers

A．At a hotel.
B．At a bank.
C．At a department store.
D．At a drug store.
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单项选择题
It can be inferred from the passage that ______.
A．new radio devices should be developed for tracking the endangered blue whales
B．blue whales are no longer endangered with the use of the new listening system
C．opinions differ as to whether civilian scientists should be allowed to use military technology
D．military technology has great potential in civilian use
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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