单项选择题

The underwater listening system was originally designed ______.

A．to trace and locate enemy vessels
B．to monitor deep-sea volcanic eruptions
C．to study the movement of ocean currents
D．to replace the global radio communications network

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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

What happened to Joy Warren's Buick

A．It had four inches of water in it.
B．One of its windows couldn't be opened.
C．It was pulled out of the water and set on the shore.
D．It sank to the bottom of the river.