单项选择题

A．Doctor and patient.
B．Policeman and car driver.
C．Librarian and student.
D．Post clerk and customer.
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单项选择题
A．Between the two windows.B．In the corner.C．Between the two doors.D．Opposite the fireplac
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B．In the corner.
C．Between the two doors.
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A．They smile to cover embarrassment.B．It is an unusual and even suspicious behavior.C．They smile to show politeness.D．It is an expression of pleasur
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B．It is an unusual and even suspicious behavior.
C．They smile to show politeness.
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