单项选择题

A．To make coins lighter.
B．To conserve silver.
C．To use up surplus copper.
D．To make coins last longer.
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单项选择题
Human violence shows evidence of being a learned behavior in that __________.
A．it threatens the existing social systems
B．it is influenced by society
C．it has roots in religious conflicts
D．it is directed against institutions of law
单项选择题
If your potential clients are all local, you still must develop and maintain a Website.
A．Y
B．N
C．NG
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