单项选择题

A．Nurse.
B．Visitor.
C．Patient
D．Cleaner.
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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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