单项选择题

A．It is more comfortable than a conventional train.
B．It doesn’t require much track maintenance.
C．It doesn’t remain in any station very long.
D．It carries more passengers than a conventional train.
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单项选择题
A．It uses nuclear energy.B．It rests on a cushion of professional air.C．It flies over magnetically activated tracks.D．It uses a device similar to a jet engine.
A．It uses nuclear energy.
B．It rests on a cushion of professional air.
C．It flies over magnetically activated tracks.
D．It uses a device similar to a jet engine.
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