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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What is the relationship between the two speakers
A．Employer and employee.
B．Salesman and customer.
C．Advertiser and customer.
D．Colleagues.
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What product are they talking about
A．Kitchen.
B．Deep-freezer.
C．Mobility units.
D．Cake mixer.
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