单项选择题

A．As much as 93%.
B．As much as 80%.
C．As much as 75%.
D．As much as 60%.
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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.
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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