单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Turn down the volume of the music.
B．Turn the music off.
C．Play a different style of music.
D．Listen to music in a different room.
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单项选择题
A．By filtering sea water.B．By treating sea water with chemicals.C．By taking salt out of sea water.D．By drying up sea water.
A．By filtering sea water.
B．By treating sea water with chemicals.
C．By taking salt out of sea water.
D．By drying up sea water.
填空题
When millions of rods in our eyes are at work in darkness, we can see ______.
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