______ men invented certain sounds to express thoughts and actions. Which is true about words?

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问题 ______ men invented certain sounds to express thoughts and actions.
Which is true about words?

选项 A、They are used to express thoughts only.
B、They can be spoken, but can not be written down.
C、They are simply sounds.
D、They are not completely known to the world.

答案D

解析 文章第一段的第一句"How men first learnt to invent words is unknown;in other words,the origin of language is a mystery."与[D]选项说法一致,为正确答案。
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