单选题：根据下面的内容，回答题.We can tell from the results of the poll that

题目分类：专四
题目类型：单选题
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题目内容：

根据下面的内容，回答题.

We can tell from the results of the poll that A．people are unconcerned about politeness nowadays.
B．"thank you" remains the best expression of gratitude.
C．there is a variety of expressions of appreciation.
D．there are more formal expressions than informal ones.

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分类：专四题型：单选题