单项选择题

The United States Food and Drug Administration has shown itself to be particularly wary with regard to alleged "miracle" drugs in recent times.

A．bellicose
B．exhausted
C．cautious
D．strange
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单项选择题
Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.
A．insane
B．infectious
C．foreign
D．poisonous
单项选择题
The primary objective of Basic Econometrics is to provide an elementary but an comprehensive introduction to the art and science of econometrics.
A．brief
B．precise
C．simplified
D．extensive
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