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
For thousands of years, people thought of glass as something beautiful to look at. Only recently have they come to think of it a
For thousands of years, people thought of glass as something beautiful to look at. Only recently have they come to think of it a
admin
2016-09-21
49
问题
For thousands of years, people thought of glass as something beautiful to look at. Only recently have they come to think of it as something to look through. Stores display their goods in large glass windows. Glass bottles and jars that hold food and drink allow us to see the contents. Glass is used to make eyeglasses, microscopes, telescopes, and many other extremely useful and necessary objects.
Until the Second World War, most of the glass used for optical instruments was imported from Europe. However, during the war Americans could not get European glass, and they were forced to make their own. As a result, new kinds of glasses were developed that had been previously unknown. These new effects were achieved by mixing other chemical elements with the sand. Some of these new glasses are very strong and can resist many kinds of shocks. Legend has it that a very hard glass was invented by a Roman who showed his discovery to the Emperor. When the Emperor saw the glass he feared that it would become more valuable than gold and silver, making his treasure worthless. Therefore, he had the glassmaker killed, and the secret was not discovered again for hundreds of years.
In the present century, safety glass was invented for use in modern cars and planes. Safety glass is made by placing a layer of plastic between two layers of plate glass. When the outside layer of glass is broken, the pieces do not scatter and injure people. Some glass of this type is strong enough to resist bullets.
Although in recent years plastics have replaced glass under conditions where glass might be easily broken, there are new uses being developed, for the greatest advantage of glass is that its component parts are inexpensive and can be found all over the world.
New uses of glass are being developed on the ground that _____.
选项
A、glass is not as safe as plastics
B、glass is not as strong and durable as plastics
C、glass is easily obtainable and inexpensive
D、glass is more and more widely used
答案
C
解析
本题解题的关键在于注意最后一段中的“there are new uses being developed,for…”,这里表明了一对因果关系,for后面引出不断研发玻璃新用途的原因,由此可见,本题正确选项应为C。选项A和B中提到的玻璃的缺点虽在现实中也是有可能的,但文中并无字句说明因为这些缺点而要不断研发玻璃的新用途。
转载请注明原文地址:https://jikaoti.com/ti/JtpFFFFM
0
大学英语四级
相关试题推荐
Doyoufindgettingupinthemorningsodifficultthatit’spainful?Thismightbecalledlaziness,butDr.Kleitmanhasanew
TraditionalChinesepaintingsconstituteauniqueschooloffineart,aschoolthat,instyleandtechniquesisvastlydifferent
A、Shewillposttheletterfortheman.B、Shehasnotimetogotothepostofficetoday.C、ShewillsendthelettertoMary.D、
Inacompetitiveeconomy,theconsumerusuallyhasthechoiceofseveraldifferentbrandsofthesameproduct.Yetunderneathth
A、BoswellwilldefeatothersintheSchoolBoardelection.B、NoonevotedforBoswellintheSchoolBoardelection.C、Boswellis
A、Sam’skneeshouldbebetterbynow.B、Thisisn’tagoodtimeforSamtoquit.C、Samisnotwisetoquitschoolrightnow.D、Sa
Stuntpeople(替身演员)arenotmoviestars,buttheyarethehiddenheroesofmanymovies.Theywerearoundlongbeforefilms.E
Americansbelievethatindividualsmustlearnto【B1】_______themselvesorrisklosingfreedom.Thismeansachievingbothfinanci
A、Heisconfidenthewillgetthejob.B、Hischanceofgettingthejobisslim.C、Itisn’teasytofindaqualifiedsalesmanage
TheRedistributionofHopeA)"HOPE"isoneofthemostoverusedwordsinpubliclife,uptherewith"change".Yetitmatterseno
随机试题
以下关于普通侵占的特征,说法正确的有()
患者,男性,17岁,接触油漆后喘息1天。伴少量白痰,有过敏性鼻炎史2年,查体:双肺广泛哮鸣音,诊为支气管哮喘急性发作,经治疗后缓解出院,护士为其进行健康教育时应指出其可能的激发因素是
患者咳嗽。查体:气管向左偏移,右侧胸廓较左侧饱满,叩诊出现鼓音。应首先考虑的是
A、急性肾小球肾炎B、慢性肾小球肾炎C、肾病综合症D、急性肾盂肾炎E、慢性肾孟肾炎何病可见较多白细胞管型,粗颗粒管型
交通部门拟修建一条公路,预计建设期为一年,建设期初投资为100万元,建成后即投入使用,预计使用寿命为10年,每年将产生的效益为20万元,每年需投入保养费8000元。若社会折现率为10%,则该项目的效益费用比为()。[2011年真题]
出口口岸()运费()
根据以下资料,回答106-110题。据初步统计,2008年我国全年水资源总量25567亿立方米,比上年减少8.9%,比常年减少7.7%;人均水资源量1945立方米,比上年减少9.3%;全年平均降水量615.5毫米,较上年减少4.5%,比常年减少4.
行政监察是指我国政府机构内部的监察机构对于行政机关及其公务员的行政行为所实施的检查与督导。从行政监督分类的角度看,行政监察是:
调制解调器(Modem)的作用是
A、Hethinksflieswilltakeovertheearth.B、Hethinkshumanwilldieoffquitesoon,C、Hethinksmassdiseasecouldbethenex
最新回复
(
0
)