首页
登录
职称英语
By the mid-nineteenth century, the term "icebox" had entered the American la
By the mid-nineteenth century, the term "icebox" had entered the American la
游客
2023-09-09
36
管理
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. [br] 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://tihaiku.com/zcyy/2998386.html
相关试题推荐
Jazzbeganintheearly20thcenturyasakindofmusicofblackAmericans.
Jazzbeganintheearly20thcenturyasakindofmusicofblackAmericans.
Jazzbeganintheearly20thcenturyasakindofmusicofblackAmericans.
Jazzbeganintheearly20thcenturyasakindofmusicofblackAmericans.
Jazzbeganintheearly20thcenturyasakindofmusicofblackAmericans.
Jazzbeganintheearly20thcenturyasakindofmusicofblackAmericans.
Jazzbeganintheearly20thcenturyasakindofmusicofblackAmericans.
[originaltext]Ingeneral,Americanfoodismildtasting;mostAmericansdo
[originaltext]AmericanvisitorstoEasternAsiaareoftensurprisedandpuz
Americanculturehasnotbeenimmunetoculturalinfluencesfromoutside.Th
随机试题
Toreadanewbook,yousimplyneedgoodlight,timeandtherightframeof
Whenamatadorisinhiscostume,theysayhe’sdressedin"lights"—onaccoun
WriteacompositionentitledShouldaCollegeGraduateRentorPurchaseaHouse.
()职业病()劳务合同[br]()全日制工作()劳务市场
在诊断上内镜应用最广的是()A.呼吸系统 B.循环系统 C.消化系统 D.
患儿,女,2岁。腹泻2天,泄泻清稀,挟有泡沫,臭气不甚,恶心呕吐,发热,鼻塞流涕
“津血同源”的理论依据是( )。A.同为营气化生 B.同为元气化生 C.同
根据材料,如果2010年该企业税负增长率维持在2009年的水平上,2010年的税
主要用于疟疾病因性预防的药物是A.乙胺嘧啶 B.奎宁 C.氯喹 D.青蒿素
阀门与管道连接时,要求阀门在开启状态下安装的是( )方式连接。 A.法兰
最新回复
(
0
)