单项选择题


A．A ) volume
B．B ) noise
C．C ) voice
D．pitch
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单项选择题
A．A ) normallyB．B ) regularlyC．usuallyD．D ) often
A．A ) normally
B．B ) regularly
C．usually
D．D ) often
单项选择题
A．A ) manyB．B ) amountC．C ) numberD．D ) supply
A．A ) many
B．B ) amount
C．C ) number
D．D ) supply
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