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单项选择题
A．Crowded air traffic.B．The large size of airplanes.C．Mistakes by air traffic controllers.D．Bad weather.
A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.
单项选择题
A．The newcomer.B．The officer.C．The bus driver.D．The people in line.
A．The newcomer.
B．The officer.
C．The bus driver.
D．The people in line.
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