首页
登录
职称英语
Thousands of years ago man used handy rocks for his surgical operations. Lat
Thousands of years ago man used handy rocks for his surgical operations. Lat
游客
2023-07-04
73
管理
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. [br] Which of the following is NOT a tool used for surgical operations before the 1960s?
选项
A、Bone.
B、Metal knives.
C、Scissors.
D、Rubber and plastic.
答案
C
解析
细节题。第一段前两句提到,数千年前,轻便的石头被用于外科手术中。之后,人类还使用了锋利的骨头或角、金属制的刀和塑胶。文中没有提到剪刀。故答案为C。
转载请注明原文地址:https://tihaiku.com/zcyy/2806808.html
相关试题推荐
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstoflo
Thethousandsofpeopleforcedtoabandontheirhomesinrecentweekstoflo
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Lat
There’snothingliketheinstinctiveroarofthecrowdwhenthousandsofpeo
There’snothingliketheinstinctiveroarofthecrowdwhenthousandsofpeo
There’snothingliketheinstinctiveroarofthecrowdwhenthousandsofpeo
There’snothingliketheinstinctiveroarofthecrowdwhenthousandsofpeo
There’snothingliketheinstinctiveroarofthecrowdwhenthousandsofpeo
随机试题
Everysecond,【C1】______hectareoftheworld’srainforestisdestroyed.That’
[originaltext]W:Hello,wehaven’tmetforalongtime.Areyoubusy?M:Actual
芝加哥期货交易所小麦期货合约的交割等级有()。A、2号软红麦B、2号硬红冬麦C、2号黑硬北春麦D、2号北秋麦平价A,B,CD项应为2号北春麦平
社会舆论是医德评价的重要方式之一,下列除哪一项之外,都是可取的()A.医
甲卷烟厂为增值税一般纳税人,2019年10月受托加工一批烟丝,委托方提供的烟
行政办公及生活服务设施用地面积不得超过工业项目总用地面积的()。A.5%
某城镇污水处理厂因接纳上游企业改变工艺后的排水而造成该厂排放口出水超标。根据《中
高层建筑中母线槽供电的替代产品,具有供电可靠、安装方便、占建筑面积小、故障率低、
根据《建筑工程施工质量验收统一标准》GB50300,下列工程中属于分项工程的是
(2016年真题)某项目建设期为2年,第一年贷款3000万元,第二年贷款2000
最新回复
(
0
)