单项选择题

Questionsll-14 are based on the following passage. How does a Maglev operate

A．It uses nuclear energy.
B．It rests on a cushion of pressurized 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
When will the world’s population hit 10 billion
A．2010.
B．2002.
C．2036.
D．2054.
单项选择题
When are airplanes not fuel efficient
A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitudes.
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