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
63
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、on
B、to
C、in
D、with
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/vahd777K
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
IcebergsIcebergsareamongnature’smostspectacular(壮观的)creations,andyetmostpeoplehaveneverseenone.Avagueairo
FreezingtoDeathforBeautyPeopleinBeijingwearalotofclothingduringwintertofend(抵御)offthecold.IntheUnited
HappyMarriage,HappyHeartHappilymarriedpeoplehavelowerbloodpressure(51)unhappilymarriedpeopleorsingles,aBri
HappyMarriage,HappyHeartHappilymarriedpeoplehavelowerbloodpressure(51)unhappilymarriedpeopleorsingles,aBri
SincetheGreatDepression,theUnitedStatesgovernmenthasprotectedfarmersfromdamagingdropsingrainprices.
Untilthelatenineteenthcentury,therewasnouniformsystemoftime-keepingintheUnitedStates.
Thehigh-speedtrainscanhaveamajorimpactontravelpreferences.
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smorec
Thetiesymbolizesallofthefollowingexcept______.WhichofthefollowingisNOTasocialoccasion?
随机试题
用高速钢切断刀切断直径为100mm的棒料,试计算该切断刀的刀头宽度和刀头长度,如果切削速度选为35m/min,求机床转速。
举例说明词义的理性意义和非理性意义。
在CT定位时,正确的床位高度是
消化性溃疡致瘢痕性幽门梗阻最典型的临床表现是
下列选项属于干式电除尘法优点的是()。
大额可转让定期存单属于()。
关于航空公司对乘机旅客计件免费行李的规定(不包括中美、中加航线),下面说法正确的是()
市场上的商品质量参差不齐,消费者多掌握一些商品质量标志知识尤为重要。下列关于商品标志的说法不正确的是()。
论述遗传素质在人身心发展中的作用。
Thisisthehour______Thailandisalwaysfullofpoliticalviolence.
最新回复
(
0
)