单项选择题

Who is not qualified to use the library

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
______ is the main object of study of phonology.
A．Phoneme
B．Speech sounds
C．Syllables
D．Stress
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