How man first learnt to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that

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问题 How man first learnt to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that man, unlike animals, somehow invented certain sounds to express thoughts and feelings, actions and things, so that they cou

选项 A、clearly explained in this passage
B、a matter that can not be or has not been explained or understood
C、a question that was difficult to answer
D、a problem already solved

答案B

解析细节推理题。文章开头就说文字是怎么发明的还是一个谜，即是没办法解释和理解的。

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本试题收录于：大学英语三级B级题库大学英语三级分类

大学英语三级B级

大学英语三级

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How man first learnt to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that

大学英语三级B级

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