单项选择题

A．Technology site.
B．Medical care site.
C．Financial site.
D．Ethnic problents site.
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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．They completed all their assignments.B．They studied hard for his tests.C．They competed for the best seats.D．They read all his books.
A．They completed all their assignments.
B．They studied hard for his tests.
C．They competed for the best seats.
D．They read all his books.
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