单项选择题

A．Booking a flight to Spain.
B．Giving Spanish tests to students.
C．Paying for private lessons.
D．Studying continually.
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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.
填空题
G
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