单项选择题

A．8. 5 hours.
B．7. 5 hours.
C．8 hours.
D．9 hours.
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单项选择题
The Indonesian province of Aceh and the eastern coast of Sri Lanka were poor and war-torn before the tsunami struck.
A．Y
B．N
C．NG
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.
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