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
2010-04-12
23
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, and hospitals, and by some forward-looking city dealers in fresh meat, fresh fish, and butter. After the Civil War (1860--1865), as ice was used to refrigerate fish in freight cars, it also came into household use. Even before 1880, half the ice sold in New York, Philadelphia, and Baltimore went to families for their own use. This had become possible because a new household convenience, the icebox, a precursor (先驱) of the modem 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 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 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, Moore explained, was that farmers would no longer have to travel to market at night in order to keep their produce cool.
According to the passage, which of the following was an obstacle to the development of the icebox?
选项
A、Competition among the owners of refrigerated freight cars.
B、The lack of a network for the distribution of ice.
C、The use of insufficient insulation.
D、Inadequate understanding of physics.
答案
D
解析
首先根据题目中的“obstacle to the development”确定答案线索应在第二段。只有D符合该段第二句的内容,即当时人们对热物理学的认识水平很低。因此,正确答案是 D项。
转载请注明原文地址:https://kaotiyun.com/show/Rqj7777K
0
大学英语四级
相关试题推荐
Beforethe20thcenturythehorseprovideddaytodaytransportationintheUnitedStates.Trainswereusedonlyforlong-distan
Beforethe20thcenturythehorseprovideddaytodaytransportationintheUnitedStates.Trainswereusedonlyforlong-distan
Readinginvolveslookingatgraphicsymbolsandformulatingmentallythesoundsandideastheyrepresent.Conceptsofreadingha
Japanisanunusualmixtureoftraditionalandultra-modern.Thiscanbeconfusingforthevisitorbecause,althoughitlooksqu
A、Gasstation,B、Policestation.C、LostandFounddepartment.D、Bar.A信息明示题,男士说:“就在这儿停吧,当我加油的时候你(女士)去问路并给我买瓶软饮料”解答本题的关键是理解男士说的fi
A、Atarestaurant.B、Inashoppingmall.C、Inalibrary.D、Inaclassroom.C根据对话中男士所说的“Accordingtothesyllabus,thebookisin
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(ANWR)tohelpsecure,America’senergyfuture?PresidentBush【B
A、Heisnervousabouttheexam.B、Heislookingforajob.C、Hedoesn’tdaretotelllies.D、Hedoesn’tknowhowtoanswertheq
A、Awholeday.B、Threeorfourfullhours.C、Sixoreightfullhours.D、Threeorfourdays.C
A、She’sinameeting.B、She’soutoftheoffice.C、She’stalkingwithanothercustomer.D、She’sspendingherholiday.B
随机试题
Theinjectionthatthegirlhadbeengivenwasbeginningtowork.Herhead【C1】______heavy,andshewasverysleepy.Oncesheope
DNA中核苷酸之间的连接方式是
某病人血红蛋白量40g/L,白细胞计数2.5×109/L,血小板计数20×109/L。该病人最可能的疾病是
某电子企业发生爆炸事故,并诱发了环境污染。根据《中华人民共和国环境保护法》,该企业必须立即采取措施处理,及时通报可能受到污染危害的单位和居民,并向()和有关部门报告,接受调查处理。
应急照明控制器应有主、备用电源的工作状态指示,并能实现主、备用电源的自动转换,且备用电源应能保证应急照明控制器正常工作()。
根据行政复议法律制度的规定,下列各项中,不属于行政复议参加人的是()。
设f(x)在[a,b]上二阶可导,f(a)=f(b)=0。试证明至少存在一点ξ∈(a,b),使
有下列程序:#include<stdio.h>main(){charv[4][10]={t.efg”,”abcd”,”mnopq”,”hijkl”},。p[4],t;inti,j;
Ifyou’refindingittoughtolandajob,followahuntingplanwiththefollowingtactics:Setyour【C1】______Whileyoushou
Theonlysurvivorofashipwreckwaswasheduponasmall,uninhabitedisland.Heprayed【1】forGodtorescuehim,andeveryday
最新回复
(
0
)