单项选择题

Which of the following is true about the U.S. Navy underwater listening network

A．It is now partly accessible to civilian scientists.
B．It has been replaced by a more advanced system.
C．It became useless to the military after the cold war.
D．It is indispensable in protecting endangered species.
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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
单项选择题
According to the author, which of the following is NOT true
A．Most countries do not have an effective law on organ transplantation.
B．The traditional way of asking for permission of relatives for organ removal does not prove to be always feasible.
C．It is hard to understand why people should remain silent on compulsory postmortem exam after unexpected death.
D．In some countries there are laws providing that the permission of organ removal is taken for granted unless it has been refused by the person in his lifetime.
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