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
A、How fax machines got a license. B、Who invented fax machines. C、How fax machines developed and worked. D、Where to buy the first
A、How fax machines got a license. B、Who invented fax machines. C、How fax machines developed and worked. D、Where to buy the first
admin
2012-07-05
70
问题
Most people might think that the fax machine, found in many offices and homes, is a relatively new piece of technology. In fact, a license for the fax machine was issued in 1843, 33 years before the telephone! A Scottish clockmaker, Alexander Bain, invented this device in the same year that the first telegraph message was being sent across America.
Although Bain worked out the method, he never actually sent a fax transmission. It was not until 1865 that the first working fax machines and transmission service were setup. (34) An Italian man named Giovanni Casel-li developed the "pan-telegraph" which was used to send pictures and writing between French cities.
The way that a fax machine works is quite straightforward. A machine scans horizontally across the sheet one line at a time—like your eyes when you’re reading a book. If the machine sees a white patch it records a 0, and if it sees a dark patch it records a 1. In this way the whole page is "digitized" into a string of 0s and Is. (35) A modem turns this into a series of high or low pitched sounds that are sent down the phone line to a remote receiver. At the other end, the sounds are turned back into 0s and 1s. These are printed onto a piece of paper as light or dark dots, and so the original picture is reproduced hundreds of miles away.
33. What is the main topic of the passage?
34. What was the "pan-telegraph" first used for?
35. What do we learn about the modem?
选项
A、How fax machines got a license.
B、Who invented fax machines.
C、How fax machines developed and worked.
D、Where to buy the first-class fax machines.
答案
C
解析
题干询问文章的主题是什么。短文中提到了传真机的发展史以及它工作的原理,故答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/Wm57777K
0
大学英语四级
相关试题推荐
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopicHuntingforaJobonInternet.Youshouldwrit
Exchangeaglancewithsomeone,thenlookaway.Soyourealizethatyouhavemadeastatement?Holdtheglanceforasecondlong
Manyayoungpersontellsmehewantstobeawriter.Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff
Today’slectureisonthesubjectofPronunciationAchievementFactors.Asanintroductionweshouldaskourselvesthreeque
Thereseemsnevertohavebeenacivilizationwithouttoys,butwhenandhowtheydevelopedisunknown.Theyprobablycameabout
Thereseemsnevertohavebeenacivilizationwithouttoys,butwhenandhowtheydevelopedisunknown.Theyprobablycameabout
Holidaysarecelebratedforallsortsofreasons.Somehonorheroes,otherscommemoratereligiousevents,butApril1ststandso
Itiseasiertonegotiateinitialsalaryrequirementbecauseonceyouareinside,theorganizationalconstraints(约束)influencewa
A、Signyouupforfamilystudenthousing.B、Recommedyouanew-graduatestudentapartment.C、Giveyoualistofrentals.D、Find
A、It’snotashardasexpected.B、It’stootoughforsomestudents.C、It’smuchmoredifficultthanpeoplethink.D、It’sbelieve
随机试题
A.镇静催眠药B.利尿药C.磺胺类D.青霉素类E.解热镇痛药可致新生儿黄疸的药物是
Hawaii,theyoungeststateoftheUnitedStates,isdifferentinmanywaysfromthemainlandstates.TheHawaiianpeopleaream
王某,男性,22岁,战士,在军事训练时不慎被战友踢及下腹部,即刻发生腹痛、排尿困难,尿道口少量滴血,由战友陪同来院急诊。根据病史该患者最可能损伤的器官是
患者,女,35岁。患子宫肌瘤2年,精神抑郁,经前乳房胀痛,胸胁胀闷,心烦易怒,小腹胀痛,时有刺痛,舌边有瘀点,苔白,脉细弦。治疗首选
患者,女性,32岁,“胃切除术”3年。近1年患者头晕、心悸、气短,疲乏无力。诊断为缺铁性贫血。指导患者口服铁剂的要点应除外
黏土看上去似乎是一种肥沃度差、由多种矿物质组成的混合物,但却可能是地球生命的起源地。在模拟古代的海水中,黏土会形成水凝胶——由大量可吸收液体的微小空间构成(像海绵一样)。过去几十亿年里,被禁锢在这些空间里的化学物可能发生了复杂的反应,从而形成了蛋白质、脱氧
从网络设计者角度看,Internet是一种______。
Inthispartofthesection,youwillhear1conversationand2lectures.Youmustanswereachquestion.Afteryouanswer,c
A、Itwillgoup.B、Itwillcomedown.C、Itwillgoupanddown.D、Itwillstaythesame.A①由选项可知,本题问It在未来的发展趋势。It在此处指代的是thepric
A、Attheendoftheonlinecatalogue.B、AttheReferenceDesk.C、IntheNewYorkTimes.D、IntheReader’sGuidetoPeriodicalLi
最新回复
(
0
)