单项选择题

A．They like to have music in the operating room.
B．They solved problems better while listening to music they liked.
C．They preferred classical music.
D．They performed better when they used headphones.
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单项选择题
A．With an increase in the amount of blood.B．With more muscles.C．With vigorous trial.D．With routine exercise.
A．With an increase in the amount of blood.
B．With more muscles.
C．With vigorous trial.
D．With routine exercise.
单项选择题
A．It becomes bigger.B．It becomes more expensive.C．It becomes cheaper.D．It becomes much safer.
A．It becomes bigger.
B．It becomes more expensive.
C．It becomes cheaper.
D．It becomes much safer.
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