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
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 travelling across different layers of water
单项选择题
Which of the following is NOT a suggestion made in the passage
A．People should be encouraged to donate their organs after death.
B．Organ removal should be permitted in the course of compulsory postmortem exam.
C．Organ removal for transplantation should be advocated because it benefits the hu- man society.
D．Organ removal for transplantation could be considered legal unless the dead person stated otherwise in his lifetime.
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