单项选择题

A．Four.
B．Five.
C．Six.
D．Seven.
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单项选择题
A．Because they are cheaper.B．Because they are adaptable to industrial use.C．Because they are not easily burned and can last longer.D．Because marble adds artistic value to ancient buildings.
A．Because they are cheaper.
B．Because they are adaptable to industrial use.
C．Because they are not easily burned and can last longer.
D．Because marble adds artistic value to ancient buildings.
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