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
______ is the main object of study of phonology.
A．Phoneme
B．Speech sounds
C．Syllables
D．Stress
单项选择题
In ______, President Nixon met Mao Zedong and the two countries issued the Shanghai Communiqu.
A．1972
B．1973
C．1974
D．1975
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