单项选择题

Cloning has been criticized for all the reasons EXCEPT ______.

A．usefulness in genetics
B．premature aging
C．its effects on the experimental animals
D．safety reasons
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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D．Because its form, style and tempo are outdated.
单项选择题
Jazz should owe its existence to ______.
A．American blacks
B．all the people
C．African Negroes
D．American people
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