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
In recent years scientists have found that the laser has a wide variety of applications, making it one of the most important inv
In recent years scientists have found that the laser has a wide variety of applications, making it one of the most important inv
admin
2009-05-04
73
问题
In recent years scientists have found that the laser has a wide variety of applications, making it one of the most important inventions for improving our quality of life.
One important field in which the laser has many applications is communications. Scientists have found that the laser beam can transmit human voices; as a result, telephone companies are now using laser light signals to transmit telephone calls through extremely small cables that are capable of carrying many more transmissions than the standard telephone cables. An additional advantage is that these systems using the laser light signals are also able to transmit video telephone conversations.
Another, perhaps less-known, field in which lasers are helping improve the quality of life is metrology—the science of measurement. The extremely straight, narrow laser beam can be used to put the parts of a structure being built into the correct position to each other. The laser beam has also been used to measure remote distances, for example, the precise distance from the Earth to the Moon. And finally, the laser can be used to measure the drifts of the Earth’s plates. This measurement, along with other data, can help in the pre-diction of the earthquakes.
Probably the most vital application of the laser is in the field of medicine. Scientists have developed a laser kniffe that surgeons can use for operations. These knives are now used widely because they cut sharply and because the beam seals off the blood vessels that it cuts, thus reducing blood loss considerably.
When Dr. Theodore got the first laser to work in July 1960, what uses it would have were unknown; in fact he called it a multimillion-dollar "solution in search of a problem". As we have seen, the uses of the laser are numerous. It is being used in the fields of medicine, communications, and metrology. There are many, many more applications, such as in the areas of defense and space travel. What should be apparent by now is that there are many problems the laser is helping to solve, and that the laser, if used wisely, can be a life-saving device.
The best title of the text might be______.
选项
A、The Laser: A Scientific and Technological Wonder
B、The Laser: A Powerful Tool for Communications
C、The Laser: A Solution to Life-Saving Problems
D、The Laser: A Multimillion Dollar Invention
答案
A
解析
主旨题。从文章的整体意思来看,作者在这篇文章里面描述了激光作为科技发展的产物在通讯、医药等领域起到巨大作用。可以说激光是现代科技的一个奇迹。其他概括不够全面,或有失偏颇。故正确的答案为A。
转载请注明原文地址:https://kaotiyun.com/show/oz3d777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Sincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoolstocopewithworkthatisdangerous,boring,burd
Howeverimportantwemayregardschoollifetobe,thereisnodenyingthefactthatchildrenspendmoretimeathomethaninth
Recentresearchhadclaimedthatanexcessofpositiveions(离子)intheaircanhaveanill-effectonpeople’sphysicalorpsych
Recentresearchhadclaimedthatanexcessofpositiveions(离子)intheaircanhaveanill-effectonpeople’sphysicalorpsych
PoliceinthepopularresortcityVirginiaBeachrecentlybeganoperatingvideosurveillancecameraswithcontroversialfacerec
PoliceinthepopularresortcityVirginiaBeachrecentlybeganoperatingvideosurveillancecameraswithcontroversialfacerec
Wehaveallhadtheexperienceofvisitingbookstoresandbuyingbooks.Howdoyoufeelaboutit?Yourclassisplanningaw
U.S.healthofficialsareincreasingsurveillancemeasuresatdoctors’officesandinternationalborderstoguardagainstthes
Whatkindofproofdidthemanprobablyhavewhenheboughttheradio?
随机试题
高失业与高通货膨胀并存的局面一般称为()。
A.不经肝脏代谢B.慢性失血性贫血95%的代谢产物在胆汁中排出C.易出现乳酸酸中毒D.作用时间超过24小时E.有调节凝血机制的作用降糖灵(苯乙双胍)
男性,35岁,右腹股沟肿块10年,站立时明显,平卧后消失,有时可降入阴囊,可还纳。查体:右腹股沟肿块,拳头大小,可还纳腹腔,外环容3指,压迫内环后肿块不再出现。该患者最佳手术方式为
隧道监控量测以()为施工监测必测项目。
按现行会计制度及有关规定,下列选项中不属于企业无形资产的是( )。
运动场上,发令员使用的发令枪打响时,会产生一股白烟,其主要成分是()。
用经典心理物理学方法测定感觉阈限容易产生序列效应,为了控制这种效应,通常采用的方法是()。(2018年)
某公司分配给人事部的IP地址块为59.67.159.224/27,分配给培训部的IP地址块为59.67.159.208/28,分配给销售部的IP地址块为59.67.159.192/28,那么这三个地址块经过聚合后的地址为()。
在WindowsServer2003系统中,能够获得如下图运行结果的命令是()。活动连接协议本地地址外部地址状态TCP0.0.0.0:135JSZX-PC:0LISTENINGTCP0.0.0.0:445JSZX-PC:0LISTENIN
在考生文件夹下,打开文档Word.docx,按照要求完成下列操作并以该文件名Word.docx保存文档。将文中最后9行文字转换成一个9行2列的表格,表格居中,列宽3厘米,表格中的文字设置为五号宋体、第一行文字对齐方式为中部居中,其它各行内容对齐方式为中
最新回复
(
0
)