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
专升本
The railroad industry could not have grown as large as it did without steel. The first rails were made of iron. But iron rails w
The railroad industry could not have grown as large as it did without steel. The first rails were made of iron. But iron rails w
admin
2011-04-26
28
问题
The railroad industry could not have grown as large as it did without steel. The first rails were made of iron. But iron rails were not strong enough to support heavy trains running at high speeds. Railroad executives wanted to replace them with steel rails because steel was ten or fifteen times stronger and lasted twenty times longer. Before the 1870’s, however, steel was too expensive to be widely used. It was made by a slow and expensive process of heating, stirring and reheating iron ore.
Then the inventor Henry Bessemer discovered that directing a blast of air at melted iron in a furnace would burn out the impurities that made the iron brittle. As the air shot through the furnace, the bubbling metal would erupt in showers of sparks. When the fire cooled, the metal had been changed, or converted to steel. The Bessemer converter made possible the mass production of steel. Now three to five tons of iron could be changed into steel in a matter of minutes.
Just when the demand for more and more steel developed, prospectors discovered huge new deposits of iron ore in the Mesabi Range, a 120 long region in Minnesota near Lake Superior. The Mesabi deposits were so near the surface that they could be mined with steam shovels.
Barges and steamers carried the iron ore through Lake Superior to depots on the southern shores of Lake Michigan and Lake Erie. With dizzying speed Gary, Indiana, and Toledo, Youngstown, and Cleveland, Ohio, became major steel manufacturing centers. Pittsburgh was the greatest steel city of ail.
Steel was the basic building material of the industrial age. Production skyrocketed from seventy seven thousand tons in 1870 to over eleven million tons in 1900.
The words "Barges and steamers" could best be replaced by which of the following?
选项
A、Trains.
B、Planes.
C、Boats.
D、Trucks.
答案
C
解析
barge意为“驳船”,steamer意为“轮船”,因为boat是船的总称,所以两者均可称为boat,所以正确答案为C。
转载请注明原文地址:https://kaotiyun.com/show/axqC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Somepeoplethinkthemoreexpensiveaproductis,thebetteritwillbe.(但事实并非如此).
Accordingtothepassage,thecomingofonlinejobsearchingbrings______.TheInternetismakingthehiringprocesslongerfo
Insomecountries,______iscalled"equality"doesnotreallymeanequalrightsforallpeople.
(LittledidIexpectthatUncleSamwoulddiesosoon).IfoundhimingoodhealthwhenIcalledonhimonlyacoupleofweeksa
Theyaregoingtohavetheserviceman______anelectricfanintheofficetomorrow.
Hedoenotcareabouttheprice,(solongasthequalityishigh).
Teachhimgently,World,butdon’tspoilhim,becauseonlythetestoffiremakesfinesteel.
Manya______wouldhaveasalewithoutprofitratherthantohavenosaleatall.
Duringthesummervacationtherewillbearevisedscheduleofservicesfortheuniversitycommunity.Specificchangesforinter
Shewasgladthatthewickedmanhaddecided______
随机试题
CO2与血红蛋白的氨基结合生成氨基甲酰血红蛋白,调节这一反应的主要因素是
下列哪一支血管不是右冠状动脉的分支
进行性排尿困难是以下哪种疾病最重要的临床表现
作为控制性规划设计,监理工程师质量控制要点有( )。
甲房地产公司根据与乙建筑公司建设工程合同中的仲裁条款,向仲裁委员会申请仲裁。在仲裁过程中,根据《仲裁法》的规定,在下列()情况下,当事人提出仲裁员的回避申请,应当得到准许。
1990年底,上海证券交易所和深圳证券交易所先后成立,标志着我国()市场正式形成。
以公开间接方式发行股票的特点包括()。
阅读下面材料,回答相关问题:Ⅰ.中学课本中介绍了如下实验:把一端弯成螺旋状的铜丝放在酒精灯外焰加热,待铜丝表面变黑后立即把它插入盛有约2mL乙醇的试管里,反复操作几次。Ⅱ.某课外活动小组利用图4装置进行乙醇的催化氧化实验并制取乙醛,图5中铁架台等装置
设随机变量X,Y相互独立,X在区间[0,5]上服从均匀分布,Y服从参数为1的指数分布,令Z=max{X,Y}.(1)求随机变量Z=max(X,Y)的概率密度;(2)计算P(X+Y>1).
Oldagehasalwaysbeenthoughtofastheworstagetobe;butitisnot(11)fortheoldtobeunhappy.Witholdageshouldc
最新回复
(
0
)