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
33
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
WhydidChinasuspendtheimportsofsomeproducts?[br][originaltext]Chinasa
Peopleneed【C1】______:childrenassumetheirparents’placeashome;boarder
风险偏好属于保守型的客户往往会选择( )等产品。?A.债券型基金 B.存款
案例: 下面是一位初三学生的作文.认真阅读完成题。 走夜路的滋味 ①从前,
基金的自律组织主要有() ①中国证监会 ②基金行业自律组织 ③中国银保监
A.毛细管作用B.改善了颗粒的润滑性C.酶解作用D.膨胀作用E.产气作用干燥淀粉
既能解郁安神,又能活血消肿的药是A.合欢皮 B.柏子仁 C.远志 D
班级授课制具有哪些主要的优缺点?
(2020年真题)关于投标文件修改的说法,正确的是()。A.投标人在招标文件
女性,60岁,发现主动脉瓣狭窄10年,快走时心前区憋闷3年。心电图示左心室肥
最新回复
(
0
)