单项选择题

A．Business executives.
B．White-collar workers.
C．Fashionable young people.
D．Government officials.
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单项选择题
As people become more proficient in a language, their nonverbal errors are not considered serious.
A．Y
B．N
C．NG
单项选择题
A．A weak heart.B．A skin disease.C．Bronchitis.D．Kidney trouble.
A．A weak heart.
B．A skin disease.
C．Bronchitis.
D．Kidney trouble.
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