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.
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.
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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