单项选择题

Giving the child problems he cant solve will only frustrate him.

A．baffle
B．worry
C．alarm
D．cultivate
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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
单项选择题
One word describes what makes Singapore work: discipline.
A．punishment
B．regulation
C．unemployment
D．salary
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