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 bones or horns, metal knives and mo
Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bones or horns, metal knives and mo
admin
2016-07-17
34
问题
Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bones or horns, metal knives and more recently, rubber and plastic. 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 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. As we all know, light is hot, and any source of light 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. Operations which once left patients exhausted and in need of long period of recovery time now leave them feeling relaxed and comfortable.
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.
Which of the following would be appropriate to describe the instruments of surgical operations up until 1960s?
选项
A、Traditional
B、Complicated.
C、Remarkable.
D、Revolutionary.
答案
A
解析
事实细节题。题干的意思是“以下哪个单词能够确切描述20世纪60年代以前的手术工具?”A选项的意为“传统的”;B选项意为“复杂的”;C选项意为“非凡的”;D选项意为“革命的”。原文第一段提到几千年前人们用石头、牛角等做手术,由此可以推断出选项A是正确的。
转载请注明原文地址:https://kaotiyun.com/show/diud777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Thefurnituredepartmentwasrunby______.Theauthorwasluckybecause______.
Where,doestheconversationmostprobablytakeplace?
Whydidtheyouthcrywhengraspedbytheoldlady?Becausehe______.Whatdoyouthinkoftheyouthwhomthepoliceorderedto
Onesummerdaymyfathersentmetobuywireforourfarm.At16,Iliked【C1】______betterthandrivingourtrack,【C2】______this
______bythebeautyofnature,thegirlfromLondondecidedtospendanothertwodaysonthefarm.
WhyisHarryunhappy?
Whenistheirflight?
Whenistheirflight?
Wheredidthewomansaysheputherglasses?
随机试题
全身麻醉药分为_________和_________两类。
女,38岁,平素体健,,5大前淋雨,3天前突然高热40℃,寒战、咳铁锈色痰伴呼吸困难,胸片示:右下肺近心缘处大片密度均匀的实变影,查休:口周存在疱疹。最可能的诊断是
A.单室单剂量血管外给药c—t关系式B.单室单剂量静脉滴注给药c—t关系式C.单室单剂量静脉注射给药c—t关系式D.单室多剂量静脉注射给药c-t关系式E.多剂量函数
银行要关注借款人()对其经营管理的影响。
根据《合同法》的规定,下列情况属于合同的变更的有()。
咸菜烧豆腐:有言在先
当判断远近不同的山时,能够很容易根据颜色浓淡来进行区分,这是()。
Theneighborsbecamesuspiciouswhentheynoticedthathiscarwas______fortwoweeks.
在实际的计算机网络组建过程中,一般首先应该做什么?()。
【B1】【B20】
最新回复
(
0
)