单项选择题

The earliest people in Sri Lanka may be ______.

A．Sinhalese
B．Tamils
C．British
D．Veddas
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单项选择题
According to the passage, cloning technology is ______.
A．promising
B．impracticable
C．pleasant
D．controversial
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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