单项选择题

A．The pilot’s concentration.
B．The efficiency of the local mobile phone network.
C．How long it takes passengers to get seated.
D．The navigational equipment of the plane.
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A．Impatient.B．Angry.C．Anxious.D．Unsatisfied.
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A．A school master.B．A computer operator.C．A computer engineer.D．A career advisory officer.
A．A school master.
B．A computer operator.
C．A computer engineer.
D．A career advisory officer.
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