单项选择题

A．underwater explosions
B．oil and gas exploration
C．whistling of ships
D．sonar navigation
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单项选择题
The Vietnam War started in ______ and ended in______.
A．1961, 1973
B．1961, 1974
C．1962, 1973
D．1963, 1976
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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