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
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.
单项选择题
What product are they talking about
A．Kitchen.
B．Deep-freezer.
C．Mobility units.
D．Cake mixer.
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