单项选择题

Conversation Two

A．How should we care for precious metal.
B．A standard unit for measuring weight.
C．How to judge the value of precious metals.
D．An introduction of the metric system.
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单项选择题
A．The need to exercise the memory.B．How the brain differs from other body tissues.C．The unconscious learning of a physical activity.D．How nerves control body movement.
A．The need to exercise the memory.
B．How the brain differs from other body tissues.
C．The unconscious learning of a physical activity.
D．How nerves control body movement.
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A．Growing vegetables.B．Raising children.C．Talking with the soldiers.D．Listening to the radio.
A．Growing vegetables.
B．Raising children.
C．Talking with the soldiers.
D．Listening to the radio.
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