单项选择题

A．It fuels with nuclear energy.
B．It rests on a cushion of pressurized air.
C．It flies above magnetically activated tracks.
D．It uses a device similar to a jet engin
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单项选择题
A．The sale of the old houses.B．The pulling down of the gas company.C．The proposal of the council.D．The building of the office blocks.
A．The sale of the old houses.
B．The pulling down of the gas company.
C．The proposal of the council.
D．The building of the office blocks.
单项选择题
A．On short trips.B．On long trips.C．When flying over cities.D．When flying at high altitudes.
A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitudes.
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