单项选择题

A．Life-style of different people is the same.
B．Different people may have completely different life-styles.
C．It’s doubtful whether life-styles are changing.
D．The changes of life-styles have’ no influence on business.
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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.
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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.
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