单项选择题

A．To speak English.
B．To read technical books in English.
C．To listen to English programs on radio.
D．To read English literature.
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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.
A．To make coins lighter.
B．To conserve silver.
C．To use up surplus copper.
D．To make coins last longer.
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
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