首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was still only beginning to affect t
By the mid-nineteenth century, the term "icebox" had entered the American language, but ice was still only beginning to affect t
admin
2010-09-25
52
问题
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(酒馆), 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 of 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 fridge, 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(未发展的). The commonsense 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 up 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, and 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, 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 topic of the passage?
选项
答案
Icebox.
解析
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。
转载请注明原文地址:https://kaotiyun.com/show/Cyz7777K
0
大学英语六级
相关试题推荐
ThepeopleoftheUSAhavebeenopposedtoacentralizedgovernmentsincelongbeforetheRevolutionof1776.Whenthe13coloni
ThepeopleoftheUSAhavebeenopposedtoacentralizedgovernmentsincelongbeforetheRevolutionof1776.Whenthe13coloni
Itwasnotuntiltheendofthe20thcenturythat__________________(我们才重视环境问题).
Emotionsaredefinedasstrong,relativelyuncontrolledfeelingsthataffectourbehavior.Everyoneexperiencesawiderangeof
Emotionsaredefinedasstrong,relativelyuncontrolledfeelingsthataffectourbehavior.Everyoneexperiencesawiderangeof
Whenyoustarttalkingaboutgoodandhadmannersyouimmediatelystartmeetingdifficulties.Manypeoplejustcannotagreewhat
Theorderfromthecommanderwasthatthetroops______.(立即开拔去前线).
Federaltroopswere-usedto______acrowdthattriedtostormthejail.
随机试题
李某原是某国有企业员工,因身体不好,下岗后在家养病没有工作。李某妻子近期也失业了,其女儿小丽今年中专毕业,也没有找到合适的工作。根据《就业促进法》,下列就业援助措施中,属于应对李某一家实行的是()。
下列《先妣事略》的句子中表现其母亲品德的有()
推动当代中国先进生产力发展的基本要素是()
十二指肠溃疡的典型症状是()
患者,男性,脑中风右侧肢体瘫痪,预防压疮最好的护理方法是
如图4-70所示,常数为k的弹簧下挂一质量为m的物体,若物体从静平衡位置(设静伸长为δ)下降△距离,则弹性力所做的功为()。
以下属于引起商标资产评估的经济事项的有()。
案例:王老师在讲解“在因特网上获取信息”这章内容“第三节搜索信息”的教学过程中,先是叙述了一遍搜索信息的分类,然后讲解了搜索信息的途径。在讲解过程中,许多同学对他的讲解很不感兴趣,有的在玩游戏,有的在聊天,但王老师仍在认真的讲解这节课的理论。问题:
根据我国
在西方,足球曾经是卑贱、粗野的代名词。那时的足球活动没有什么规则,更谈不上什么礼仪,和打群架没什么区别,弄出人命是常有的事。但这种游戏特别血腥,特别刺激,特别有吸引力,虽屡屡遭禁,却每每“春风吹又生”。为了使得这个人们又爱又恨的游戏益于身心,也为了改变“下
最新回复
(
0
)