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  3. By the mid-nineteenth century, the term "ice-box" had entered the American language, but ice was still only beginning to affect

By the mid-nineteenth century, the term "ice-box" had entered the American language, but ice was still only beginning to affect

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问题   By the mid-nineteenth century, the term "ice-box" 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 ice-box, a precursor of the modern refrigerator, had been invented.      Making an efficient ice-box was not as easy as we might now suppose.  In the early nineteenth century, the knowledge of heat, which was essential to a science of refrigeration, was rudimentary. The commonsense notion that the best ice-box was one that prevented the ice from melting was of course mistaken, for it was the melting of 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 ice-box.  
   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 ice-box 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 ice-box, Moore explained, was that farmers would no longer have to travel to market at night in order to keep their produce cool.
What is the main idea of this passage?
选项 A、The influence of ice on the diet.
B、The transportation of goods to market.
C、The development of refrigeration.
D、Sources of the term "ice-box".
答案C
解析 主旨题。(Lines 7-8，Para．1)This had become possible because a new household convenience，the ice-box，a precursor of the modem refrigerator，had been invented．第一段提到“ice-box”一词于19世纪中叶进入美国语言，在美国内战后，冰块开始服务于家用目的。冰的广泛使用是因为当时冰箱的前身“ice-box”已经被发明出来。(Line1，Para．2)Making an efficient ice-box was not as easy as we might now suppose．第二段叙述高效冰箱的研制情况，直到19世纪末高效冰箱才得以问世。第三段介绍了19世纪初农民Thomas Moore用自制冰箱冷藏黄油，深受顾客欢迎。   
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