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
72
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
Ihavenoticedthatchildrenarenotevenbeingschoolinsocialgraces.AtaSundaybrunch,aclownwasmakingballoonanimals
Recentresearchhadclaimedthatanexcessofpositiveions(离子)intheaircanhaveanill-effectonpeople’sphysicalorpsych
Recentresearchhadclaimedthatanexcessofpositiveions(离子)intheaircanhaveanill-effectonpeople’sphysicalorpsych
PoliceinthepopularresortcityVirginiaBeachrecentlybeganoperatingvideosurveillancecameraswithcontroversialfacerec
Aftermillenniaofgrowthwhichwassoslowthateachgenerationhardlynoticedit,thecitiesaresuddenlyracingoffinevery
Recently,theWorldHealthOrganizationcarriesoutastudyover70,000teensin34nations.Thestudyisamongschoolchildren
WhichofthefollowingiscoveredinBCDInternationalprograms?______
Almostallourmajorproblemsinvolvehumanbehavior,andtheycannotbesolvedbyphysicalandbiologicaltechnologyalone.Wha
Whatkindofproofdidthemanprobablyhavewhenheboughttheradio?
随机试题
开放性气胸首要处理原则是()
血中激素浓度极低,但生理作用却非常明显,这是因为
道路桥洞通行界限:行人和自行车高度界限为()m,汽车高度界限为()m。
根据《中华人民共和国城乡规划法》的规定,在规定区域内的乡、村庄规划,由乡、镇人民政府组织编制,报()审批。
你的客户投资某共同基金,你为他搜集并整理了下列信息:购买日:2005年7月1日购买数量:10000份买入价:1.15元/份卖出日:2006年7月1日卖出数量:10000份卖出价:1.20元/份红利支付日:2006年6月30日投资收益红利:5元/10
费用具体包括()。
关于国家教育经费投入体制构成,正确的是()。
把下列的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是:
Inorderto"changelivesforthebetter"andreduce"dependency",GeorgeOsborne,ChancelloroftheExchequer,introducedthe"
造成计算机中存储数据丢失的原因主要是()。
最新回复
(
0
)