单项选择题

Human cloning is unlikely to happen because ______.

A．people feel cloned children may not live longer than those naturally born
B．cloning technology is not so advanced that people feel doubts about it
C．it is so expensive that ordinary people have no access to it
D．it is not only costly and inefficient, but unacceptable as well
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单项选择题
Which of the following statements about cloning technology is true
A．Because of the criticism, it has been stopped
B．Because of the opposition, it will be illegal for five years
C．Although it is criticized, it has made great progress
D．Although it is criticized, it is a perfect technology
单项选择题
We can reasonably conclude from the passage that ______.
A．if African blacks had not been taken to American, there would be no jazz music
B．when a black died his friends and relatives would play happy music for him
C．the blacks had possessed a rich musical tradition before they were made slaves
D．black people, in general, live a miserable and unhappy life in America
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