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
38
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、capable
B、probable
C、practical
D、possible
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/eahd777K
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
FreezingtoDeathforBeautyPeopleinBeijingwearalotofclothingduringwintertofend(抵御)offthecold.IntheUnited
ChangesofWomen’sRoleTheroleofwomeninBritainhaschangedalotinthiscentury,(51)inthelasttwentyyears.Them
BeforegettingParkinson’sdisease,WaynelovedDeepBrainStimulationismosteffectivefor
Medicinedependsonotherfieldsforbasicinformation,particularlysomeoftheirspecializedbranches.
Themostcrucialproblemanyeconomicsystemfacesishowtouseitsscarceresources.
IntheUS,aperson’scompanybuyshimorherhealthinsurance.ThehealthcaresystemintheUStakescareofeveryoneinthe
IntheUS,aperson’scompanybuyshimorherhealthinsurance.In2004,mostoftheunemployedintheUSwerewomen.
Whydidmanywomenfeelthatknittingwasoutofdate?Theword"quit"inParagraph2isclosestinmeaningto
随机试题
据《周礼》记载,周朝专设司民之职,这反映出古代很早就有【】
管理的二重性是指( )
在PC机中实现硬盘与主存之间数据传输的主要控制部件是中断控制器。()
患者男性,49岁。因全身乏力、头晕,手指有麻木感前来就诊。体检:面色苍白,巩膜轻度黄染,舌质绛红色,舌乳头萎缩,心率101次/分。实验室检查:红细胞2.3×1012/L,血红蛋白78g/L,白细胞4.9×109/L。Coombs试验阴性。患者确诊还需做
以阴阳失调来阐释真寒假热或真热假寒,其病机是
A.普萘洛尔B.苯妥英钠C.奎尼丁D.利多卡因E.胺碘酮可诱发或加重支气管哮喘急性发作的药物是()。
所谓违法分包的行为,是指()
除法定情形外,外国人在我国就业实行()。
试述西欧中世纪早期教育的基本特点及其产生的原因。
A、Gotowork.B、Tellthenewstootherpeople.C、Buyanumbrella.D、Gohometoclosethewindows.D行动计划题。男士说新闻报道说未来两天会刮风下雨;女士忽然想
最新回复
(
0
)