首页
登录
职称英语
For thousands of years, people thought of glass as something beautiful to lo
For thousands of years, people thought of glass as something beautiful to lo
游客
2023-07-16
60
管理
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. [br] All of the following concerning the safety glass are discussed in the text EXCEPT______.
选项
A、its uses
B、its strength
C、its structure
D、its limitations
答案
D
解析
推理判断题。本题考查列举处,用排除法可以找出答案。第3段中除选项D外,选项A可从第1句推断,选项B可从最后一句推断,选项C可从第2句推断。
转载请注明原文地址:http://tihaiku.com/zcyy/2843364.html
相关试题推荐
Theword"sport"firstmeantsomethingthatpeopledidintheirfreetime.L
Theword"sport"firstmeantsomethingthatpeopledidintheirfreetime.L
Theword"sport"firstmeantsomethingthatpeopledidintheirfreetime.L
Theword"sport"firstmeantsomethingthatpeopledidintheirfreetime.L
Theword"sport"firstmeantsomethingthatpeopledidintheirfreetime.L
[originaltext]Sincethebeginningofhistory,peopleontheearthhavealwa
TheWeatherBureauhasrepeatedlyadvisedthepeopletotakeevery______agains
Manyoftheinventionsthatmadepeople______andhavedeterminedthedirection
Peopletendtohavecontradictoryattitudesaboutloudnoise.Ontheonehan
Peopletendtohavecontradictoryattitudesaboutloudnoise.Ontheonehan
随机试题
[img]2016m1x/ct_etoeiclm_etoeiclzp_0001_20161026[/img][br][originaltext](A)Th
Justover10yearsago,IngmarBergmanannouncedthatthewidelyacclaimed
[originaltext]Today,airtravelismuchsatyrthandrivingacaronabusy
设f(x)是可导函数,Δx是自变量在点x处的增量,则( )。A.2f′(x)f
( )是风险分析和管理中的一项基础性工作。A、风险评估 B、风险识别
阅读下面材料,根据要求作文。 有三个这样的孩子:一个孩子4岁才会说话,7岁才
新古典经济学以市场为导向的主张在西方环境政策的形成中起到了重要作用,但其研究方法
配电柜应装设的配备器具有()。A.电源隔离开关 B.静电保护器 C.电
主要通过性接触传播的传染病是 A.甲型病毒性肝炎 B.艾滋病 C.流行性乙
应付账款和预付账款一样都是负债类科目。()
最新回复
(
0
)