单项选择题

A．post-graduate students
B．senior university students
C．professionals
D．teachers of history
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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
单项选择题
A．in FebruaryB．in MarchC．in AprilD．in May
A．in February
B．in March
C．in April
D．in May
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