单项选择题

A smile is typically an expression of () in American culture.

A. embarrassment
B. politeness
C. sadness
D. pleasure

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Where will the tourists enjoy the magnificent Terracotta Warriors In the ancient city （）
单项选择题
Sellers in the group buying benefit by ()

A. paying less
B. selling many produdcts at once
C. bargaining with each buyer
D. selling goods at a higher price
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