单项选择题

A．June 1st.
B．July 1st.
C．August 1st.
D．December 1st.
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单项选择题
A．Courses in British history.B．Language courses.C．Courses in sports.D．Teacher training courses.
A．Courses in British history.
B．Language courses.
C．Courses in sports.
D．Teacher training courses.
单项选择题
A．Crowded air traffic.B．The large size of airplanes.C．Mistakes made by air traffic controllers.D．Bad weather.
A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes made by air traffic controllers.
D．Bad weather.
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