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 tha
The Development of Rubber Here is the story of rubber. From the earliest time it was common knowledge (51) the Peruvians tha
admin
2012-09-10
44
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 col D. But the rubber we have today is soft and elastic (有弹性的), (59) very strong m 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 sulfur (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 sulfur. It took Goodyear four more years to find this metho D. 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、for
B、to
C、about
D、with
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/NmQd777K
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
Malnutrition"Muchofthesicknessanddeathattributedtothemajorcommunicablediseasesisinfactcausedbymalnutritio
AcandidatesforclinicaltrialsBduringthetrialCmedicalknowledgeDinhumansEbeforeparticipationFforsomepatients
TryingtoFindaPartnerOneofthemoststrikingfindingsofarecentpollintheUKisthatofthepeopleinterviewed,one
AcandidatesforclinicaltrialsBduringthetrialCmedicalknowledgeDinhumansEbeforeparticipationFforsomepatients
AcandidatesforclinicaltrialsBduringthetrialCmedicalknowledgeDinhumansEbeforeparticipationFforsomepatients
RiseinNumberofCancerSurvivorsCanceristhesecondleadingcauseofdeathintheUnitedStates,afterheartdisease.I
ASpecialClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclock(5
TeachingandLearningMedicineAwardTwoscientistswhohavewonpraiseforresearchintothegrowthofcancercellscouldb
TeachingandLearningMedicineAwardTwoscientistswhohavewonpraiseforresearchintothegrowthofcancercellscouldb
AInsectsandSurfaceTensionBExpansionandContractionCTemperatureofBoilingPointofLiquidsDPrincipalsinphysics
随机试题
下列审计程序中,不属于关联方审计中风险评估程序的是()。
销毁病案之前应作好规划和测算,其中不包括
不能引起特异性感染的是
口服剂型胃肠道中吸收最快的一般认为是()。
(2015年)2015年4月,最高法院发布了《关于人民法院推行立案登记制改革的意见》。关于立案登记制,下列理解正确的是:()
国际公认的债务依存度警戒线在()之间。
【2015工商银行】Shecouldnotformulateherideasinafewwords.
导游这一职业列入《中国职业分类大典》是在20世纪90年代。()
针对本区域环境污染的现状,张老师带领本组老师编写了有关环境保护的学生读本,这突出体现了张老师是()。
(),是指党的领导、政府领导都要加强,而不是只加强某一种领导。党委领导和政府领导都要不断适应新形势的需要,通过改革和完善,加强各自的领导职能,形成领导关系的全面强化。
最新回复
(
0
)