What is the topic of the passage? Where was ice used after the Civil War?

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问题 What is the topic of the passage?
Where was ice used after the Civil War?

选项

答案In refrigerating freight cars and households.

解析 题目询问在内战后冰被用在哪些地方。根据题干关键词Civil War可以定位至文章第一段第四句话,由... ice was used to refrigerate freight cars... into household use 可知问题的答案。
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