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
The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge(51)the Peruvians that whe
The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge(51)the Peruvians that whe
admin
2009-06-15
37
问题
The Development of Rubber
Here is the story of rubber. From the earliest time it was common knowledge(51)the Peruvians that when a cut was made in the outside skin of a rubber tree, a white liquid(52)milk came out, and that(53)this a sticky (粘的) mass of rubber might be made. This rubber is soft when. warm, so that it is possible to give it any(54). The Peruvians made the(55)that it was very good for keeping out the wet. Then in the early 1800’s, the Americans made use of it for the first time. First they made overshoes to(56)their feet dry. Then came a certain Mr. Mackintosh, who made coats of cloth covered with natural rubber. From that day to this we have been coating cloth with rubber as Mr. Mackintosh(57), and our raincoats are still named after him.
But these first rubber overshoes and raincoats were all soft and sticky in summer, and(58)and inelastic (无弹性的) in the winter when it was cold. But the rubber we have today is soft and elastic (有弹性的),(59)very strong—even in the warmest summer and the coldest winter. This was made(60)by a man called Goodyear. After many(61), he found that nitric acid (硝酸) made the rubber much better, but it is not hard and strong enough. Then a strange thing took(62). A friend of his, Nicholas Hayward, had the idea in his sleep that rubber might be made hard and strong if mixed with sulphur (硫磺) and put in the sun. Goodyear put this idea(63)the test, and saw that it did have more or less the desired effect—though somewhat less than more. The only effect it had was on the outside of the rubber. It is common knowledge now that the(64)to make rubber hard and strong is by heating it with sulphur. It took Goodyear four more years to find this method. When at last he did it, he had(65)at all. Everything of the smallest value had been used to get money, even his sons’ school-books.
选项
A、or
B、however
C、though
D、even
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/Yahd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Theconstructionoftherailwayissaidtohavebeenterminated.
FreezingtoDeathforBeautyPeopleinBeijingwearalotofclothingduringwintertofend(抵御)offthecold.IntheUnited
Hypnosis(催眠)1IncreasingnumbersofAmericandoctorsareusingatechniqueknownashypnosis.Theysayhypnosisoftencanhelp
ChangesofWomen’sRoleTheroleofwomeninBritainhaschangedalotinthiscentury,(51)inthelasttwentyyears.Them
ChangesofWomen’sRoleTheroleofwomeninBritainhaschangedalotinthiscentury,(51)inthelasttwentyyears.Them
SprainedAnkleOneofthemostcommoninjuriesteenagersandadultsexperienceisasprainedankle.Asprainoccurswhenthe
Accordingtothepassage,physical,mental,andemotionalhealthareInShelton’seyes,tryingtoconvinceintelligentpeoplet
I’mworkingwithaguyfromLondon.
IntheUS,aperson’scompanybuyshimorherhealthinsurance.In2004,mostoftheunemployedintheUSwerewomen.
LifetimeemploymentintheJapanesecompanymeansthattheemployeeThepassagemainlydiscusses
随机试题
多器官功能障碍综合征(MODS)特点有
谈论美味佳肴时引起唾液分泌是
关于局部神经元回路,不正确的论述是
肝硬化患者机体多种功能受到影响,出现低血糖的主要原因是
关于高桩码头工程岸坡抛填施工时的说法,正确的是()。
“运输工具名称及号码”:SUNSEA/407E。()
定置管理的开展程序是()。
在人人都有发言权的微博时代,一个不经意的转发和评论,既可能为真相增添力量,也可能不小心成为谣言的帮闲,甚至可能成为他人的灾难。该如何更好地行使自己的话语权,这是一个值得认真对待的问题。近日《中国青年报》有篇文章谈到,一旦被主观偏见、愤怒情绪、不假思索的责骂
我国科研人员经过对动物和临床的多次试验,发现中药山茱萸具有抗移植免疫排斥反应和治疗自身免疫疾病的作用,是新的高效低毒免疫抑制剂。某医学杂志首次发表了关于这一成果的论文。多少有些遗憾的是,从杂志收到该论文到它的发表,间隔了6周。如果这一论文能尽早发表的话,这
It’spartofthenewyearritual—anannualattempttostartafreshandturnoveranewleaf.Butmakingresolutionsisanearpo
最新回复
(
0
)