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.
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单项选择题
A．People’s health.B．People’s lives and futures.C．The end of the world.D．The Great Depression of 1929.
A．People’s health.
B．People’s lives and futures.
C．The end of the world.
D．The Great Depression of 1929.
填空题
independently
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