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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
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
填空题
The underlined word pronounced in paragraph I is closest in meaning to ______.
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