单项选择题

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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.D. They performed better when they used headphones.
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.
D. They performed better when they used headphones.
单项选择题
A. Precious metals. B. Population pressures.C. Government policies. D. Agricultural practices.
A. Precious metals.
B. Population pressures.
C. Government policies.
D. Agricultural practices.
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