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
在家就能做的十种健身运动学起来
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Excerpts from Lei Feng’s Diary《雷锋日记》节选十二
肯德基新推出人造素食炸鸡,大受好评
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The Book I Like 我喜欢的书
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法国“奥斯卡”最佳动画片:活生生的欧洲名人启示录
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