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
2024-02-02
18
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] Why did Americans make their own glass during the Second World War?
选项
A、The war blocked the way of glass import.
B、They refused to use the European glass.
C、The glass made in Europe was out of date.
D、They were able to make a new kind of glass.
答案
A
解析
从第2段的第1、2句可以看出,二战前美国从欧洲进口玻璃,而战时却不能从欧洲进口玻璃,也就是说,进口玻璃的渠道应是被战争中断了,因此答案应为选项A。选项D是不能进口玻璃的结果,而不是原因。其余两项都没有原文依据。
转载请注明原文地址:https://tihaiku.com/zcyy/3414904.html
相关试题推荐
[originaltext]WeddingsintheUnitedStatesvaryasmuchasthepeopledo.
[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
随机试题
Hasyourneighbourhoodchangedmuchsinceyourfamilyfirstmovedin? No,note
女,55岁,为慢性阻塞性肺疾病(COPD)气肿型患者。近年来轻微活动即感气急,咳
A.实现既定管理目标 B.提高行政效果 C.使管理活动有序进行 D.提高社
油浸电压互感器电压比不合格()属于一般缺陷。(A)试验数据严重超标,无法继续
2020年1—6月,限额以上单位商品零售额同比约增长:A.6.53% B.
空间分辨率是指()A.影像能够显示地面上最大地物的尺寸,在卫星影像上一般指单
目前,披露上市交易公告书的基金品种主要有()A:LOFB:封闭式基金C:货币
甲、乙、丙、丁计划设立一家从事技术开发的天际有限责任公司,按照公司设立协议,甲以
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
最新回复
(
0
)