单项选择题

A．320,000
B．400,000
C．500,000
D．450,000
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单项选择题
A．The workers on the underground platforms were replaced by machines.B．It became the first completely automatic railway in the world.C．A completely automatic line was added to its network.D．Its trains became computer controlled.
A．The workers on the underground platforms were replaced by machines.
B．It became the first completely automatic railway in the world.
C．A completely automatic line was added to its network.
D．Its trains became computer controlled.
单项选择题
A．on bicycles.B．on motorcycles. C．by car. D．by bus.
A．on bicycles.
B．on motorcycles.
C．by car.
D．by bus.
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