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
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
2015-06-23
27
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 revolutionize the art and science of surgery.
The tool is the laser and it is being used by more and more surgeons all over the world, for a very large number of different complaints. The word "laser" means: light amplification by stimulated emission of radiation. As we all know, light is hot, any source of light — from the sun itself down to a humble match burning — will give warmth. But light is usually spread out over a wide area. The light in a laser beam, however, is concentrated. 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 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, no unwanted damage — a true surgical wonder. Operations which once left patients exhausted and in need of long period of recovery time now leave them feeling relaxed 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.
The appearance of the laser in the 1960s results in______.
选项
A、a complete revolution in the science of surgical techniques
B、an end to pain brought by all diseases
C、medical help accessible to more common people
D、complete changes in man’s approach to surgery
答案
A
解析
细节题。第一段最后一句提到,这种新的手术工具为外科医学带来了革命性的影响。故答案为A。
转载请注明原文地址:https://kaotiyun.com/show/kRl7777K
0
大学英语四级
相关试题推荐
Americanuniversitiesarerushingtowardsawirelessfuture.Theyareinstallingnetworksthatletstudentsandteacherssurfth
Americanuniversitiesarerushingtowardsawirelessfuture.Theyareinstallingnetworksthatletstudentsandteacherssurfth
ANewYorkTimes-CBSNewspollfoundthatalmost90percentofAmericansthinkthathomeownershipisanimportantpartoftheAm
ANewYorkTimes-CBSNewspollfoundthatalmost90percentofAmericansthinkthathomeownershipisanimportantpartoftheAm
ANewYorkTimes-CBSNewspollfoundthatalmost90percentofAmericansthinkthathomeownershipisanimportantpartoftheAm
Ifyouareayoungcollegestudent,mostofyourconcernsaboutyourhealthandhappinessinlifeareprobably【B1】______onthe
Ifyouareayoungcollegestudent,mostofyourconcernsaboutyourhealthandhappinessinlifeareprobably【B1】______onthe
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Laterheusedsharpboneorhorn,metalknivesandmore
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Laterheusedsharpboneorhorn,metalknivesandmore
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstofloodwatersarevictimsnotjustofnaturebutofhuman
随机试题
女性21岁。排球运动员,近半年体力下降,活动后心悸气短,心前区不适。查体:身体细高,四肢细长,心脏较大,主动脉瓣区舒张期叹息样杂音,点头征(+),周围血管征(+),BP110/40mmHg,超声:主动脉扩张。最可能的诊断是
再植牙成功的标准中不恰当的是
塑性指数IP是指土颗粒保持结合水的数量,说明可塑性的大小,用于确定()的名称和确定单桩极限承载力。
注册会议召开前,办公室应至少提前( )个工作日,将经过初审的企业注册文件和初审意见送达参会委员。
评价人员与评价对象相互沟通,并收集资料、评分和汇总整理发生在评价实施过程中的()。
下列应当实行数罪并罚的是()。
1,4,12,30,(),146
输入掩码字符“&”的含义是()。
Salesman:Goodmorning,Iwonderifyoucouldspareafewminutesofyourtime.Mrs.Davis:______.Areyousellingsomething?
Newspapersarenotnearlyaspopulartodayastheywereinthepast.Therearenotverymanypeoplewhoseriouslyreadanewspap
最新回复
(
0
)