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
Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bone or horn, metal knives and more
Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bone or horn, metal knives and more
admin
2015-04-14
26
问题
Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bone or horn, metal knives and more recently, rubber and plastic and that was where we stuck, in surgical instrument terms, for many years. In the 1960s a new tool was developed, one which was, first of all, to be of great practical use to the armed forces and industry, but which was also, in time, to change greatly the art and science of surgery.
The tool is the laser(激光)and it is being used by more and more surgeons all over the world. As we all know, light is hot, any source of light—from the sun itself down to a simple match burning—will give warmth. But light is usually spread out over a wide area. The light in a laser beam(激光束), however, is concentrated(密集). This means that a light with no more power than that produced by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized(针尖大小的)beam.
Experiments with these pinpoint beams showed researchers that different energy sources produce beams that have a particular effect on certain living cells. It is now possible for eye surgeons to operate on the back of human eye without harming the front of the eye, simply by passing a laser beam right through the eye-ball. No knives, no stitches(缝针), no unwanted damage—a true surgical wonder. Operations which once made patients tired and in need of long period of recovery time now leave them feeling calm and comfortable. So much more difficult operations can now be tried.
The rapid development of laser techniques in the past ten years has made it clear that the future is likely to be very exciting. Perhaps some cancers will be treated with laser in a way that makes surgery not only safer but also more effective. Altogether, tomorrow may see more and more information coming to light on the diseases which can be treated medically.
By applying the laser beam, surgeons can perform operations which______.
选项
A、may make their patients suffer with negative effects
B、may take their patients a long time to recover
C、do little harm to their patients
D、can only treat eye diseases
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/44UC777K
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
Rumoristhemost【56】wayofspreadingstories—bypassingthemonfrommouth【57】mouth.Butcivilizedcountriesinnormaltimesha
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
Whatshouldyouthinkaboutwhentryingtofindyourcareer?Youareprobablybetteratsomeschoolsubjectsthanothers.These
Thepurposeofanapplicationletteristohelpyouto"sell"yourself.Youshould【31】thejobyouwantclearly,andshouldtell
Doparentsowetheirchildrenanything?Yes,theyowethemagreatdeal.(69)Oneoftheirchiefdutiesistogivetheirch
(非英语专业学生做)WomenintheUnitedStatesandmanyothercountries【61】inagrowingnumberofsportsandgames.ManyAmericanwom
Althoughonlyof______intelligence,hespeaksfourlanguagesfluently.
______youfeeltootiredtogoout.Iwouldrathernotstayathometonight.
(2003)Itwouldbe_____togetasecondopinionbeforetakinganyfurtheraction.
Mostyoungpeopleenjoyphysicalactivities,walking,cycling,football,ormountaineering.Thesewhohaveapassion【C1】____
随机试题
在Excel2003中,若计算单元格.A2、B1、B2的和并填在C2单元格中,则在C2中输入下列______一定正确。
下列关于胰液分泌的调节的叙述,错误的是
胫骨中1/3骨折易导致
X钡餐检查显示皮革胃,多见于
天然大理石饰面板材不宜用于室内()。
下列表述中,不能体现环境对人身心发展的影响的是()。
价值规律的内容和要求是()。
在党的十一届三中全会召开前夕,邓小平同志在中央工作会议上所作的奠定改革开放基础的讲话是()。
Largepartsoftheworldhavenotenjoyedtheremarkableglobalprogressinhealthconditionsthathavetakenplaceoverthepas
Allofthefollowingwerereasonsfortheproposaloftheamendmenttotheconstitution,theVolsteadAct,EXCEPTthat______.
最新回复
(
0
)