单项选择题

A．1 500 years ago.
B．2 000 years ago.
C．2 500 years ago.
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单项选择题
A．More than four.B．Three.C．Five.
A．More than four.
B．Three.
C．Five.
单项选择题
A．Expensive.B．Cheap.C．Reasonable.
A．Expensive.
B．Cheap.
C．Reasonable.
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