单项选择题

The primary objective of Basic Econometrics is to provide an elementary but comprehensive introduction to the art and science of econometrics.

A．brief
B．precise
C．simplified
D．extensive
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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
A number of animals in Aesop's fables are portrayed as being crafty.
A．vain
B．virtuous
C．artistic
D．cunning
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