单项选择题

A．On the walls of caves.
B．On a heavy clay tablet.
C．On woods.
D．On cloth.
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单项选择题
A．It made a lot of noise.B．It caused fires frequently.C．The fire from the furnaces polluted the air.D．The city authorities didn’t want to develop the glassmaking industry.
A．It made a lot of noise.
B．It caused fires frequently.
C．The fire from the furnaces polluted the air.
D．The city authorities didn’t want to develop the glassmaking industry.
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