单项选择题

A．A lack of available flights.
B．Long delays at the airport.
C．When flying over cities.
D．When flying at high altitudes.
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单项选择题
A．The German.B．The Italian.C．The Japanese.D．The Hindus.
A．The German.
B．The Italian.
C．The Japanese.
D．The Hindus.
单项选择题
B
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