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.
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单项选择题
A．Giving a lecture.B．Discussing political science.C．Working on a science problem.D．Reading twentieth-century literature.
A．Giving a lecture.
B．Discussing political science.
C．Working on a science problem.
D．Reading twentieth-century literature.
单项选择题
A．To keep active at work.B．To prevent from seeing the doctor.C．To contract infectious diseases more easily.D．To enjoy the pleasures of life.
A．To keep active at work.
B．To prevent from seeing the doctor.
C．To contract infectious diseases more easily.
D．To enjoy the pleasures of life.
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