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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单项选择题
Cowries shells were once in widespread use as a token of value.
A．a symbol
B．an amount
C．a thing
D．an investment
单项选择题
Chimpanzees are frequently used as stand-ins for human beings in experiment.
A．partners
B．role-models
C．stand-bys
D．substitute
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