1. What is the topic of the passage?
2. Where was ice used after the Civil War?
3. What was essential to a science of refrigeration according to the passage?
4. It can be inferred from the passage that the theoretical foundation of ice box should be that
5. Without an ice box, farmers had to go to the market at night because 第2页:答案
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The 15th National Book Fair declared open in Tianjin in March 18th, 2016.
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I feel very excited at the thought that in another week 阅读理解答案
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Mark Twain was a great writer. He was from the USA. 阅读理解答案
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