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
专升本
A very interesting and important development in science is a device called laser. A laser is a machine which produces a light be
A very interesting and important development in science is a device called laser. A laser is a machine which produces a light be
admin
2019-03-28
33
问题
A very interesting and important development in science is a device called laser. A laser is a machine which produces a light beam. The light produced by a laser is a very special kind of light. The light, called a laser beam, is powerful and can be made to do many things. The laser was first developed in 1960, about more than half a century ago.
There are many different uses for lasers and several different types have been developed. Some use gases to produce the light beam. The gases are heated and cooled, and these processes cause the gases to produce energy in the form of light. One special point of lasers is that the light beam can be stored. If the stored light is then suddenly let go, it is extremely powerful. The light from a laser beam can be used either by storing it and letting it go suddenly, or by using it in a continuous stream.
There are three important areas where the control of the laser beam has been put into use by scientists. These areas are industry, communications, and medicine. In each area, the scientists have been able to use the laser to do things that they could not do in another way. The laser has been very helpful.
In industry, the laser beam has been used for measurement and drilling. When something large is being built—for example, a large bridge—it is important to have very accurate measurements. By accurate measurement, lasers are also helpful in laying down pipelines over long distances. As lasers become more common in industry, there will be more and more uses for them.
The best title for the passage is______.
选项
A、The Light
B、The Laser
C、A Laser Beam
D、The Use of Laser
答案
C
解析
通读全文可知,全文通篇在讲laser beam,并介绍了它的来源和用途。由此可知,选项C正确。
转载请注明原文地址:https://kaotiyun.com/show/VBJC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
People’sattitudes【C1】______gift-givingmay【C2】______fromcountrytocountry,【C3】______thedesiretoconveyafeelingoffrie
Globalwarmingiscausingmorethan300,000deathsandabout$125billionineconomiclosseseachyear,accordingtoareportb
A.Withalltheinformationfedtooursenseseveryday,thedataisalwaysaresultofthepast,andwhatliesinthefutureis
A.Whatwasnotrealizedinthoseearlyyearswasthatbirdshavemusclesverymuchstronger,inproportiontotheirsize,than
Dr.RichardStevens,aSeniorLecturerinPsychologyattheOpenUniversity,giveshisopiniononcloning:"Cloningisaver
PriscillaOuchida’s"energy-efficient"houseturnedouttobeahorribledream.
HardlyhadIgothome______thetelephonerang.
Afriendofminemetwithanaccidentdrivingindarkness.Hislegsweresohurtthathecouldn’tmove.Whatwasthe【C1】______w
Ifyouhaveneverplantedanything,youwon’tbeabletoknowthepleasureofwatchingthethingyouhaveplanted______.
Mary______allfoolishcommentsandkeptonworking.
随机试题
古时候甲、乙、丙、丁四个强盗抢劫后分赃,已知甲、乙分得的赃物之和占总数的,甲、丙分得的赃物之和占总数的,甲、丁分得的赃物之和占总数的,则甲分得的赃物占总数的:
蜜炙时,若蜜黏稠不易与药物拌匀可以
某除尘器结构简单、投资低、占地面积少、除尘效率高,能同时进行有害气体的净化,但回收物料处理较困难。此种除尘器为()。
建筑物的地下室、半地下室,应采用防火墙分隔成面积不超过多少平方米的防火分区?()
某商场在开业前要选择经营商业的种类,现有甲、乙、丙、丁四类商品可供选择。由于对未来市场需求无法做到比较精确的预测,只能大致估计为:需求量较高、需求量中等、需求量较低三种情况。这三种情况的预计损益值如下表所示:根据以上资料,回答下列问题:财务
材料:2020年春季,为将新型冠状肺炎疫情对教学工作的影响降到最低,全国掀起了“停课不停学”的在线教学浪潮。郭老师也是其中的一员。作为班主任,她参与学校组织的线上教学培训,根据班级学生特点,积极探索线上授课的技巧和方法。课前,她认真钻研
近年来,我国沿海地区经常出现大面积的赤潮。受赤潮影响,这些海域中的鱼虾、贝类大量死亡,经济损失十分惨重。下列关于赤潮的说法,不正确的是( )。
中国近代政府最早颁布的全国性学制系统是()
日本では、11月15日に七五三のお祝いをします。7歳と3歳の女の子、そして、5歳の男の子は和服や洋服の正装をして、神社へ参ります。この行事は昔の誕生お祝いの仕方から伝わりました。満年齢で1歳、3歳、5歳、7歳は大切な年です。1歳は赤ちゃんが2本の
NoticeOverthepastmonththePersonnelOfficehasreceivednumerouscallsabouttheapprovalprocessforusingthenew"fl
最新回复
(
0
)