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The advantage of this method was that the dried corn could be stored for long periods of time without ______.

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spoiling

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Most of the corn was dried and then ______.

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The main subject of the talk last time was ______ of early agriculture-based society.

The advantage of this method was that the dried corn could be stored for long periods of time without ______. 您的浏览器不支持 audio 元素。