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
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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.
单项选择题
Which of the following can best sum up the passage
A．Legal and ethical problems of organ transplantation.
B．Some underlying principles on organ transplantation.
C．The diagnosis of death before organ transplantation.
D．The difference between compulsory postmortem exam and organ transplantation.
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