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
Attitudes on the two sides in the Revolutionary War precluded the possibility of a peaceful solution.
A．presaged
B．prejudiced
C．anticipated
D．prevented
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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