单项选择题

A．They liked to have music in the operating room.
B．They solved problems better while listening to music they liked.
C．They preferred classical music to pop music.
D．They performed better when they used headphones.
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单项选择题
A．Less than ten minutes.B．About twenty minutes.C．Forty-five minutes.D．Over an hour.
A．Less than ten minutes.
B．About twenty minutes.
C．Forty-five minutes.
D．Over an hour.
单项选择题
A．Its texture.B．Its size.C．Its preservation.D．Its shape.
A．Its texture.
B．Its size.
C．Its preservation.
D．Its shape.
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