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．Both are having a cold.B．Both are on holidays.C．The woman feels sorry for the man.D．The woman hopes to see the man in the school.
A．Both are having a cold.
B．Both are on holidays.
C．The woman feels sorry for the man.
D．The woman hopes to see the man in the school.
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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