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．Differences between peoples will gradually disappear.B．The tourism industry will become flourishing.C．The world will become more and more interesting..D．People in different countries will still keep their own customs.
A．Differences between peoples will gradually disappear.
B．The tourism industry will become flourishing.
C．The world will become more and more interesting..
D．People in different countries will still keep their own customs.
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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