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
2023-07-01
41
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
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:https://tihaiku.com/zcyy/2798640.html
相关试题推荐
[originaltext]WeddingsintheUnitedStatesvaryasmuchasthepeopledo.
[originaltext]WeddingsintheUnitedStatesvaryasmuchasthepeopledo.
EndangeredPeoplesA)Today,itisnotdistance,butcult
EndangeredPeoplesA)Today,itisnotdistance,butcult
EndangeredPeoplesA)Today,itisnotdistance,butcult
EndangeredPeoplesA)Today,itisnotdistance,butcult
EndangeredPeoplesA)Today,itisnotdistance,butcult
[originaltext]M:Doyouthinkyoungpeoplearegiventoomuchfreedomnowadays,
Chinesepeoplehavetheirownculturewhenitcomestogivinguniquebabygi
Manyyoungpeoplebelievegoodgrades,excellentinternshipswilllandthem
随机试题
Ingeneral,theancientRomanswerepracticalpeople.Theycaredlittleabou
Youcantracktheminrealtime,butalsolookbackonmemorablemomentstogethe
Youarerequiredtowritealetterforapplicationaccordingtothefollowingin
根据《房地产广告发布规定》,房地产经纪机构发布所代理的房地产项目广告应提供的文件
想象:是指人脑对过去形成的表象进行加工改造而产生新形象的心理过程。想象包括无意想
设函数要使f(x)在点x=1处连续,则a的值应是: A.-2B.-1C.0
右心房和胸腔大静脉的血压为 A.收缩压B.舒张压 C.脉压D.中心静脉压
政府对于行业的管理和调控主要是通过产业政策来实现的,产业政策中居于核心地位的是
2011年11月1日,____在酒泉卫星发射中心成功发射,并于11月3日与201
关于实行价格歧视的说法,错误的是()。A.市场上存在收入水平不同的购买者 B
最新回复
(
0
)