单项选择题

A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.
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单项选择题
A．Her unique experience.B．Her future prospects.C．Her favourite job.D．Her lonely life.
A．Her unique experience.
B．Her future prospects.
C．Her favourite job.
D．Her lonely life.
单项选择题
A．With a knife.B．On the edge of some metal.C．On some glass.D．On a piece of paper.
A．With a knife.
B．On the edge of some metal.
C．On some glass.
D．On a piece of paper.
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