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
2017-03-21
50
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(搅拌) and reheating iron ore.
Then the inventor Henry Bessemer discovered that directing a blast of air at melted iron in a furnace (火炉) would burn out the impurities (杂志) that made the iron brittle (脆弱的) . 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. 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 all.
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.
It can be inferred from the passage that the mass production of steel caused______.
选项
A、a decline in the railroad industry
B、a revolution in the industrial world
C、an increase in the price of steel
D、a feeling of discontent among steel workers
答案
B
解析
推理判断题。文章最后指出,钢是工业时代的基本建筑材料,据此可以推断,钢的大量生产将会带来一场工业革命,故选B项。
转载请注明原文地址:https://kaotiyun.com/show/zDXC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Itisn’toftenthatanentireindustryissymbolizedinthefigureofasinglehumanbeing,andsuchisthecasewithCanadiana
Itisn’toftenthatanentireindustryissymbolizedinthefigureofasinglehumanbeing,andsuchisthecasewithCanadiana
Inrecentyears,moreandmoreforeignersareinvolvedintheteachingprogramsoftheUnitedStates.Boththeadvantagesandth
______inthestreet,hecouldfeelthehappinessofChristmas.
Astudyofarthistorymightbeagoodwaytolearnmoreaboutaculturethanispossibletolearningeneralhistoryclasses.M
Accordingtopsychologists(心理学家),allemotionisarousedwhenamanoranimalviewssomethingaseitherbadorgood.Whenapers
每一个人都希望这个乏味的讨论马上结束。
Wedeveloptradewiththatcompanyforourshared().
A、She’llgotothetheatre.B、She’llgotoEngland.C、She’lldrivetoseehersister.D、She’lldrivehermothertotheairport.
我们常常发现运用一个规律比懂得它要难得多。
随机试题
下列选项中,不属于测算股权资本成本的常用方法的是()。
患者,60岁,男性。急性心肌梗死后6个月,出现严重心绞痛,血压20.0/12.7kPa(150/95mmHg),V3~V5ST段持续性抬高;X线可见心脏有反常搏动。诊断为
A.医用纱布B.医用棉花C.医用橡皮膏D.一次性使用无菌注射器E.医用绷带
对沉板桩过程中出现的异常情况,可采取的有效措施有()。
个体工商户在计算其个人所得税时,不可以在税前扣除的是()。
企业效益提高。对全体员工给予等比例奖励的工资调整方法是()。
下列各句中,没有语病的一项是()。
中南铁合金厂的全部职工人数为()人。
TheU.S.SecretService,whichstudies"targetedviolence",providesinsightontheurgencyoftheneedinits2002"SafeSchool
seeingtime
最新回复
(
0
)