单项选择题

Medical equipment sold to doctors is an instance of ______.

A．consumer product
B．industrial product
C．raw material
D．direct exchanged product
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单项选择题
Recent studies have identified four major global environmental risks; acid rain, ozone depletion, deforestation and the greenhouse effect.
A．recognized
B．proved
C．got rid of
D．multiplied
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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