单项选择题

A．How to care for precious metals.
B．A standard unit for measuring weight.
C．The value of precious metals.
D．Using the metric system.
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单项选择题
A．Twelve lunar months.B．The home of the moon goddess.C．A mentally ill person affected by the moon.D．A guard against the moon.
A．Twelve lunar months.
B．The home of the moon goddess.
C．A mentally ill person affected by the moon.
D．A guard against the moon.
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