单项选择题

A．A survey.
B．A simple technique.
C．A statement.
D．An example.
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单项选择题
A．They smile to cover embarrassment.B．It is an unusual and even suspicious behavior.C．They smite to show politeness.D．It is an expression of pleasure.
A．They smile to cover embarrassment.
B．It is an unusual and even suspicious behavior.
C．They smite to show politeness.
D．It is an expression of pleasure.
单项选择题
A．Doctor and patient.B．Policeman and car driver.C．Librarian and student.D．Post clerk and customer.
A．Doctor and patient.
B．Policeman and car driver.
C．Librarian and student.
D．Post clerk and customer.
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