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Part IV Reading Comprehension ( Reading in Depth)
Section A
47. Icebox.
文章从头到尾都在讲icebox是如何产生的、其工作原理和优点，可见icebox是这篇文章的中心。
48. In refrigerating freight cars and households.
题目询问在内战后冰被用在哪些地方。根据题干关键词Civil War可以定位至文章第一段第四句话，由…ice was used to refrigerate freight cars…into household use可知问题的答案。
49. Knowledge of the physics of heat.
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。
50. the melting of ice performed cooling
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。
51. they wanted to keep their produce cool
由题干关键词farmers had to go to the market at night定位至原文最后一句话…was that farmers would no longer have to travel to market at night in order to keep their produce cool，大意是有了冰盒，他们不用再为了保证产品新鲜而半夜赶路去市场了。可见目的是to keep their produce cool。
