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【题目】No one knows who salt, but it's very helpful to our life.

A. invented B. discovered C. created D. found out

【答案】B

【解析】句意:没有人知道谁发现了盐,但是它对我们的生活非常有用。invent发明,原来不存在,后来创造的;discover发现,原来就存在;create创造,原来不存在;found out找到,查明,经过一番努力获得了结果。结合句意,盐原来就存在,因此表示发现,故选B。

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