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
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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
单项选择题
The primary objective of Basic Econometrics is to provide an elementary but a comprehensive introduction to the art and science of econometrics.
A．brief
B．precise
C．simplified
D．extensive
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