单项选择题

A．800 years.
B．400 years.
C．550 years.
D．2,000 years.
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单项选择题
A．There are 200 vehicles for every kilometer of roadway.B．It has dense population.C．There are many museums and palaces.D．It has many towering buildings.
A．There are 200 vehicles for every kilometer of roadway.
B．It has dense population.
C．There are many museums and palaces.
D．It has many towering buildings.
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