单项选择题

Questions 16 to 18 are based on the passage you have just heard.

A. Precious metals.
B. Population pressures.
C. Government policies.
D. Agricultural practices.

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单项选择题

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.

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