单项选择题

Why has Jazz changed many times since its formation

A．Because it wants to add something new.
B．Because it is too energetic.
C．Because it wants to keep up with the time.
D．Because its form, style and tempo are outdate
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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
单项选择题
The first paragraph mainly suggests ______.
A．some authorities don't like Dolly's cloning in many aspects
B．cloning technology has aroused great anxiety among people
C．President Clinton stopped giving money to researchers on human cloning
D．40-nation Council of Europe had passed a ban on human cloning
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