单项选择题

The underlined word "impair" at the end of Paragraph 2 can be best replaced by ______.

A．neglect
B．weaken
C．come together with
D．be superior
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单项选择题
It is believed that efforts at resuscitation are useless when ______.
A．artificial respiration and massage of the heart have yielded no obvious result
B．a person's heart beat and breath has totally stopped
C．standard methods of resuscitation have failed
D．the brain is certainly dead
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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