单项选择题

A．Telling jokes.
B．Falling asleep during class.
C．Staying late after class.
D．Eating in the cafeteria.
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单项选择题
A．External noise.B．Physiological noise.C．The effect of a cold.D．Psychological effect.
A．External noise.
B．Physiological noise.
C．The effect of a cold.
D．Psychological effect.
单项选择题
A．She hasn’t learned French.B．She can speak several foreign languages including French.C．She can speak both German and French.D．She speaks neither French nor German.
A．She hasn’t learned French.
B．She can speak several foreign languages including French.
C．She can speak both German and French.
D．She speaks neither French nor German.
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