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
2017-05-27
88
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什么?”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/yGrd777K
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
Itwasthedistrictsportsmeet.Myfootstillhadn’thealed(痊愈)froma(n)【36】injury.Ihad【37】whetherornotIshouldattendthe
Whatisthewomangoingtodothisafternoon?
Inperiodofthesummerholidaystherewillbearevisedschedule(修改过的时刻表)ofservicesforthestudents.Changesfordining-room
ItwasClark’sfirstvisittoLondon:UndergroundRailway.Against【36】adviceofhisfriends,hedecidedtogothereafter5o’c
TodayIvisitedtheSmiths--myfirsttimevisit【76】______toaAmericanfamily.Theyliveinasmall
TodayIvisitedtheSmiths--myfirsttimevisit【76】______toaAmericanfamily.Theyliveinasmall
OneafternoonIwassittingatmyfavoritetableinarestaurant,waitingforthefoodIhadordered.SuddenlyI【36】thatamansit
Ifitrains,weshouldnotgoout,butthesky______perfectlyclear.
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Laterheusedsharpbonesorhorns,metalknivesandmo
Thousandsofyearsagomanusedhandyrocksforhissurgicaloperations.Laterheusedsharpbonesorhorns,metalknivesandmo
随机试题
下列激素中哪一种不是腺垂体分泌的()
下列属于正常细胞性贫血的是
患者,女性,24岁。在春季旅游中途觉胸闷、呼吸困难,全身大汗。查体:唇稍发绀,呼吸急促,双肺满布干啰音,心率90次/分,律齐。过去曾有类似发作。休息后自行缓解。下列诊断哪一项可能性最大()
建设项目环境影响经济损益分析的内容和步骤有()
【2014.江西】教育的发展依赖于经济的发展,所以应优先发展经济,后发展教育。()
树根:根雕:工艺品
Howisitpossiblethatsuchwidespreaddeceptionhascometotakeplacerightunderournoses?
《埃维昂协议》
无产阶级领袖在革命和建设中发挥了重大作用,但无产阶级领袖是人而不是神,必然受到一定历史条件的限制,有时也会有这样或那样的失误。评价无产阶级领袖人物,必须()
A、Drinkingwine.B、Drinkingsoda.C、Drinkingbeer.D、Voting.D题目问德国不允许18岁以下的孩子做什么。对话中男士说德国规定18岁才拥有投票权。也就是说,18岁以下不参与投票。故选D。
最新回复
(
0
)