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  3. The Origin of Refrigerators By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was

The Origin of Refrigerators By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was

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问题                         The Origin of Refrigerators
    By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was still only beginning to affect the diet of ordinary citizens in the United States. The ice trade grew with the growth of cities. Ice was used in hotels, taverns, and hospitals, and by some forward-looking city dealers in fresh meat, fresh fish, and butter. After the Civil War(1861 - 1865), as ice was used to refrigerate freight cars, it also came into household use. Even before 1880, half the ice sold in New York, Philadelphia, and Baltimore, and one-third of that sold in Boston and Chicago, went to families for their own use. This had become possible because a new household convenience, the icebox, a precursor of the modern refrigerator, had been invented.
    Making an efficient icebox was not as easy as we might now suppose. In the early nineteenth century, the knowledge of the physics of heat, which was essential to a science of refrigeration, was rudimentary. The common sense notion that the best icebox was one that prevented the ice from melting was of course mistaken, for it was the melting of the ice that performed the cooling. Nevertheless, early efforts to economize ice included wrapping the ice in blankets, which kept the ice from doing its job. Not until near the end of the nineteenth century did inventors achieve the delicate balance of insulation and circulation needed for an efficient icebox.
    But as early as 1803, an ingenious Maryland farmer, Thomas Moore, had been on the right track. He owned a farm about twenty miles outside the city of Washington, for which the village of Georgetown was the market center. When he used an icebox of his own design to transport his butter to market, he found that customers would pass up the rapidly melting stuff in the tubs of his competitors to pay a premium price for his butter, still fresh and hard in neat, one-pound bricks. One advantage of his icebox, more explained, was that farmers would no longer have to travel to market at night in order to keep their product cool.
It can be inferred from the passage that after 1880______.
选项 A、ice began to be widely used in hospitals and hotels
B、ice began to affect the diet of common citizens in America
C、many American families had the icebox
D、one third of the ice sold in America went to families for their own use
答案C
解析 推理判断题。第一段倒数第二句说，1880年之前，大多数的冰块已经进入家庭消费。倒数第一句说明了原因，即icebox已经被发明出来了。题干问的是1880年之后，而A、B、D选项所述内容为1880年之前，故排除。
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