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  3. What is the topic of the passage? What was essential to a science of refrigeration ac. cording to the passage?

What is the topic of the passage? What was essential to a science of refrigeration ac. cording to the passage?

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问题 What is the topic of the passage?
What was essential to a science of refrigeration ac. cording to the passage?
选项
答案Knowledge of the physics of heat.
解析 由题干关键词a science of refrigeration定位到原文第二段第二句话，...the knowledge of the physics of heat， which was essential to a science of refrigeration直接给出了问题的答案。
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