单项选择题

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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填空题
The underlined word pronounced in paragraph I is closest in meaning to ______.
单项选择题
A．A survey.B．A Simple technique.C．A statement.D．An exampl
A．A survey.
B．A Simple technique.
C．A statement.
D．An exampl
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