What is the topic of the passage? It can be inferred from the passage that the theoretical foundation of ice box should be that

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问题 What is the topic of the passage?
It can be inferred from the passage that the theoretical foundation of ice box should be that ______.

选项

答案the melting of ice performed cooling

解析题目询问冰盒的理论原理是什么。可以定位到文章第二段的第三句话，...for it was the melting of the ice that performed the cooling，此句大意说当时人们以为阻碍冰融化才能有效制冷，但实际上这是错误的观点，因为只有在冰的融化过程中才能有效制冷。可见冰盒的理论原理就是the melting of ice performed cooling。

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大学英语六级

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What is the topic of the passage? It can be inferred from the passage that the theoretical foundation of ice box should be that

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