单项选择题

The United States Food and Drug Administration has shown itself to be particularly wary with regard to alleged "miracle" drugs in recent times.

A．bellicose
B．exhausted
C．cautious
D．strange
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单项选择题
Chimpanzees are frequently used as stand-ins for human beings in experiments.
A．partners
B．role-models
C．stand-bys
D．substitute
单项选择题
One of the most interesting inhabitants of our world is the bee, an insect which is indigenous to all parts of the globe except the Polar Regions.
A．residents
B．pets
C．intimates
D．creatures
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