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early September
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单项选择题
A．post-graduate studentsB．senior university studentsC．professionalsD．teachers of history
A．post-graduate students
B．senior university students
C．professionals
D．teachers of history
单项选择题
A．underwater explosionsB．oil and gas explorationC．whistling of shipsD．sonar navigation
A．underwater explosions
B．oil and gas exploration
C．whistling of ships
D．sonar navigation
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