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
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单项选择题
A number of animals in Aesop's fables are portrayed as being crafty.
A．vain
B．virtuous
C．artistic
D．cunning
单项选择题
When we were in the mountains, we often found ourselves entirely enveloped by the fog.
A．confined
B．surrounded
C．darkened
D．blocked
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