单项选择题

What is the topic of the talk

A．Energy conservation.
B．Transportation of the future.
C．Strip cities:
D．Advantages of air transportation over railroads.
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单项选择题
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.
单项选择题
What problem faces commuters to travel between strip cities
A．A lack of available flights.
B．Long delays at the airport.
C．Boredom on long flights.
D．Long trips to and from airport.
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