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．Their business hours are limited.B．Their safety measures are inadequate.C．Their banking procedures are complicated.D．They don’’t have enough service windows.
A．Their business hours are limited.
B．Their safety measures are inadequate.
C．Their banking procedures are complicated.
D．They don’’t have enough service windows.
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