题目内容

The old lady walked away, still _____________ ( smile ) and waving back to me.

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He refused to take back the ______________( crumple ) up bills that he gave to the boy a moment ago.

Match the words inblueto their definitions:shareculturetypical1_______ (adj) usual or common; something you expect2_ (v) to use or experience with others3_______ (n) the ideas or behavior of a people or society

信息产品的特点不包括( )。

A. 知识产品的研发成本很高
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C. 知识产品的产量无限界
D. 产品的价值取决于生产的成本

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