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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单项选择题
The underlined word impair at the end of Paragraph 2 can best be replaced by ______.
A．neglect
B．weaken
C．come together with
D．be superior to
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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