单项选择题

A．External noise.
B．Physiological noise.
C．The effect of a cold.
D．Psychological effect.
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单项选择题
A．Telling jokes.B．Falling asleep during class.C．Staying late after class.D．Eating in the cafeteria.
A．Telling jokes.
B．Falling asleep during class.
C．Staying late after class.
D．Eating in the cafeteria.
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