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
105
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.
From the text we learn that the laser can______.
选项
A、cut a structure from a right position
B、design parts of a complex structure
C、measure the distance between planets
D、predict the movement of earth’s plates
答案
C
解析
推断题。从原文第三段第三句话“The laser beam has also been used to measure re- mote distances,for example,the precise distance from the Earth to the Moon.”可知,利用激光还可以测量更远的距离,比如说地球和月亮之间的精确距离。通过语义转换,激光可以用作测量星球之间距离的工具,故正确的答案为C。
转载请注明原文地址:https://kaotiyun.com/show/Iz3d777K
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
Ihavenoticedthatchildrenarenotevenbeingschoolinsocialgraces.AtaSundaybrunch,aclownwasmakingballoonanimals
Parentsnowhaveapopularbeliefthatschoolsarenolongerinterestedinspelling.NoschoolIhavetaughtinhaseverignored
Parentsnowhaveapopularbeliefthatschoolsarenolongerinterestedinspelling.NoschoolIhavetaughtinhaseverignored
Recentresearchhadclaimedthatanexcessofpositiveions(离子)intheaircanhaveanill-effectonpeople’sphysicalorpsych
PoliceinthepopularresortcityVirginiaBeachrecentlybeganoperatingvideosurveillancecameraswithcontroversialfacerec
MarkTwain’sletterabouttheStatueofLiberty______.
WhichofthefollowingiscoveredinBCDInternationalprograms?______
Almostallourmajorproblemsinvolvehumanbehavior,andtheycannotbesolvedbyphysicalandbiologicaltechnologyalone.Wha
Almostallourmajorproblemsinvolvehumanbehavior,andtheycannotbesolvedbyphysicalandbiologicaltechnologyalone.Wha
随机试题
在期初在产品与期末在产品的数量基本平衡的情况下,对生产成本进行分配时,应该考虑期初和期末在产品负担的生产成本。()
执行自动筛选的数据清单,必须
朱门沉沉按歌舞。
A.静脉穿刺针B.气管镜C.导尿管D.听诊器E.输液器材属于中度危险物品的是
患者,男性,23岁。大便后滴血4天,排便时有肿块脱出,大便后可自行缩回肛门,无疼痛。提示:查体肛门未见异常,直肠指诊未扪及包块。较为合理的治疗包括
药物不良反应包括()。
会计资料的真实性和完整性,是会计资料最基本的质量要求,是会计工作的生命。()
《中华人民共和国商业银行法》规定了办理储蓄应当遵守的原则有()。
2013年3月,某省会城市人民政府拟出台《关于全面推进民营经济健康发展的若干办法》(以下简称《办法》)的规章。该《办法》规定:“凡上一年度本市前100名纳税民营企业的企业主,其子女参加高中入学考试,总成绩可加20分。”该《办法》在征求社会各界意见的过程中引
A、neverdreamedofbecominganactressB、alwaysdreamedofbecominganactressC、wasnotgoodatspeakingD、alwaysthoughtshec
最新回复
(
0
)