单项选择题

A．Giving a lecture.
B．Discussing political science.
C．Working on a science problem.
D．Reading twentieth-century literature.
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单项选择题
A．Three types of noise that can make communication difficult.B．The meaning of external noise.C．The effect of cigarette smoke.D．The reason why you can become speechless.
A．Three types of noise that can make communication difficult.
B．The meaning of external noise.
C．The effect of cigarette smoke.
D．The reason why you can become speechless.
单项选择题
A．School senator.B．School treasurer.C．School secretary.D．School president.
A．School senator.
B．School treasurer.
C．School secretary.
D．School president.
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