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.
单项选择题
A．4,000 years ago.B．3,000 years ago.C．2,000 years ago.D．1,000 years ago.
A．4,000 years ago.
B．3,000 years ago.
C．2,000 years ago.
D．1,000 years ago.
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