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
A．Spring and fall.B．Summer and spring.C．Winter and summer.D．Fall and winter.
A．Spring and fall.
B．Summer and spring.
C．Winter and summer.
D．Fall and winter.
单项选择题
A．To demonstrate the latest use of computer graphics.B．To raise funds for public television programming.C．To explain the workings of the brain.D．To increase membership in professional medical societies.
A．To demonstrate the latest use of computer graphics.
B．To raise funds for public television programming.
C．To explain the workings of the brain.
D．To increase membership in professional medical societies.
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