英语四级考试仔细阅读每日一练(12.14)

　　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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