首页
登录
职称英语
A very interesting and important development in science is a device called l
A very interesting and important development in science is a device called l
游客
2024-02-06
62
管理
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 laser beam, is powerful and can be made to do many things. The laser was first developed in 1960, about 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. [br] 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
主旨题。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://tihaiku.com/zcyy/3426158.html
相关试题推荐
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceed
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceed
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceed
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceed
ThecountriesthathavelefttheUnitedStatesbehindinmathandscienceed
[originaltext]Peanutsareanimportantcropinmanydevelopingcountries.B
[originaltext]Peanutsareanimportantcropinmanydevelopingcountries.B
[originaltext]Recentlysomeresearchersconductedaninterestingcasestudy
[originaltext]Asweknow,itisveryimportantthatafirmshouldpayatten
[originaltext]Asweknow,itisveryimportantthatafirmshouldpayatten
随机试题
[originaltext]Thankyousomuchforyourtime.[/originaltext]A、It’smypleasure
Yournewproductwouldnothavesoldsowellbutforalotofadvertisementswe
[originaltext]Itwasnotyeteleveno’clockwhenaboatcrossedtheriverw
一青年农夫,32岁,吸烟史8年,天天10支左釉冬否认慢性咳嗽、咳痰史
保密的重要性不包括A.不引起医患矛盾 B.不危害他人及社会 C.不引起患者家
常见的建设工程施工索赔有( )。A.因合同文件引起的索赔 B.有关工
以下各药属于不易泛油的中药是A.枸杞子 B.麝香 C.天冬 D.党
材料:德国人米斯特今年某日持所购京剧票去北京H剧院观看京剧“空城计”,不料该剧几
正常心理中,心理不健康包括()。(2008-05)A:严重心理问题 B:各种神
在病例对照研究中,估计某因素与疾病的联系程度,应计算 A.RR B.RR
最新回复
(
0
)