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
32
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
Itisuniversallyacknowledgedthatnothingismorepreciousthantime,______(但又
White-collarcrime—crimecommittedbypersonsofaffluence,ofteninthecou
腰椎间盘突出症最常受累的神经根是()A. B. C. D.
政府投资主要应该投向()。A.国有企业 B.有盈利的部门 C.社会基础设施
关于平屋面的工程做法,下列哪项是正确的?()A.在两层三元乙丙丁基橡胶防水层
股权投资基金的全程为私人股权投资基金(PrivateEquityForid)
已知某工作的持续时间为4天,最早开始时间为7天,总时差2天,则该工作的最迟完成时
以下各项中,应列入无形资产的是( )。A.专利权 B.股权 C.著作权
施工方案应当由()组织编制,并经()审批签字后提交项目监理机构。A.施工单位
某居民从市场购得新鲜野生蘑菇,食后全家人发生毒蕈中毒,表现为恶心、呕吐、腹泻、腹
最新回复
(
0
)