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
64
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.
What do we find after the development of the laser in the 1960s?
选项
A、Industrial revolution brought surgery changed greatly.
B、Medical help became available for industrial workers.
C、The study of art went through a complete revolution.
D、Human being’ s methods in surgery changed greatly.
答案
D
解析
事实细节题。题干的意思是“20世纪60年代激光取得发展后我们可以发现?”根据原文第一段最后一句可知“激光为外科手术带来革命性的变化”,故选D。
转载请注明原文地址:https://kaotiyun.com/show/piud777K
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
Idon’tknowwhatillnesshesufferedfrom,butIdorememberhementioned______inhospitallastyear.
Theword"convenient"inthepassagemeans______.Ifyoucutanothercaroff,itsdrivermaybe______.
Morethanoneteacher______toldhimitisimportantthathelearnEnglishwellifhe______abroad.
Mancannotpreventtheworldfrombeingpollutedbecause______.Accordingtothepassage,whatdoesmancaremostamongthefo
-Sorry,butImustgoandcatchtheplanenow.-Canwe______atimeforanotherdiscussion?
Readingisnottheonlywaytogainknowledgeoftheworkinthepast.Thereisanotherlargereservoir(知识库)whichmaybecall
Wheredidtheconversationtakeplace?
假设你的英文名为Jack,是英国诺丁汉大学的中国留学生。你负责为在该校就读的32名中国学生筹划圣诞节期间的苏格兰之行,为期7天,请你给诺丁汉的STA(StudentsTravelAgency)经理Phil发一封电子邮件,联系有关事宜。要点:
Whenistheirflight?
Susan:I’msogladtoseeyou,David.【K1】______hasbeensuchalongtime.Howareyou?David:I’mfine,andyou?Susan:I’mju
随机试题
1996年2月19日,A企业就其生产的家用电器注册了“青凌”商标。后来B企业使用该商标生产冰箱,并在2006年4月开始销售“青凌”牌冰箱。下列说法正确的是()。
成本逼近法的基本公式为:土地价格=土地取得费+土地开发费+利息+利润十土地增值收益。()
《证券公司监督管理条例》规定,因故意犯罪被判处刑罚,刑罚执行完毕未逾()年的个人,不得成为持有证券公司5%以上股权的股东、实际控制人。
下列各项说法中不正确的是()。
阿芳出生在一个贫困家庭,父亲在她6岁时被捕入狱后死在狱中,剩下姐姐和她与母亲相相依为命。1999年姐姐结婚出嫁,为筹办姐姐的婚事,母亲到处筹款借钱,给生活拮据的家庭添加了债务。2000年阿芳从职校毕业,找了一个宾馆服务员的工作,为还债,她经常替小姐妹们加班
EncounterEnvironmentalToursofferstripstosomeofthemostbeautifulandisolatedwildernessesintheworld______allthecom
近代中国遭遇了巨大民族危机,列强人侵,军阀割据。近代中国社会的性质属于()。
有一类攻击可以确定通信的位置和通信主机的身份,还可以观察交换信息的频度和长度。这类攻击称为______。
有如下类定义:classMyClass{intvalue;public:MyClass(intn):value(n){}intgetValue()eonst{returnvalue;}
LawrenceSterne’s______wasconsideredasthepioneerworksofthestream-of-consciousnessnovel.
最新回复
(
0
)