ReferenceforTeaching一、异域风情1.AlexanderBell'sGreatInventionMostpeopleknowthatAlexanderGrahamBellinventedthetelephone.Butnotmanyknowaboutaccothertalkingdeviceheinventedjustfouryearslater,in1880.Hecalledthedevicethephotophone.‘Photophone’comesfromtheGreekwordsfor‘light’and‘sound’.Thephotophonedidnotuseelectricitytocarrysoundoverwiresbetweentwopeople.That'swhatatelephonedoes.Instead,thephotophoneusedabeamofsunlighttravellingthroughtheair.Withhisinvention,Bellcouldactuallytransmithumanspeechonabeamoflight.Todoso,hespokeclosetoathinmirrorthatwasreflectingsunlight.Thevibrationsofhisvoicecausedthemirrortovibrate,andthevibratingmirrorcausedthelighttovibrate.Thevibratinglighthitalight-sensitivecellinareceiverplacedsomedistanceaway.Thecellchangedthelightpatternsintoelectricalsignals.Earphoneschangedthesignalsbackintosounds.Bellbelievedthathisideaoftalkingonabeamoflightwouldprovetobeimportant.Heoftencalledthephotophonehisgreatestinvention.Eventhoughthephotophonedependedonasourceofenergythatwasnotconstant—thesun—Bellwasn'tabitdiscouraged.Hefeltsurethatpeoplewouldonedaytalkusingbeamsoflight.TwomuchmorerecentdevelopmentsmadeBell'sdreamcometrue.In1960,ascientistbuiltthelaser.Alaserproducesahighlyconcentratedbeamoflight.Shortlyafterward,otherscientistsdevelopedanewkindofopticalfibre.Theopticalfibreisaglassthread.Thenewfibrecouldcarrylightbeamslongdistances—asfarasseveralmiles.2.WhoInventedMotionPictures?Thepleasureswhichamoviefilmoffterstooureyeshavebeenpaidforwiththelossofsightofamanwhosenameishardlyknownoutsidetheannalsofscience—JosephPlateau,aBelgianprofessorborninBrusselsin1801.Hestudiedthemechanismofsight,beginningaseriesofmostdangerousexperimentsattheageof28bystaringintothesunfor25secondstoseewhattheeffectonhiseyeswouldbe.Hewasblindfornearlyamonth.Buthewentonexperimenting,increasingthelengthoftimeduringwhichhelookedintothesun,knowingthatintheendthiswouldcosthimhissight.Attheageof42hewascompletelyandincurablyblind;thesunhaddestroyedtheretinaofhiseyes.Buthecontinuedtoworkaswellashecoulduntilhediedattheageof82.Scienceprofitedenormouslyfromhisresearch.Hestudiedthesocalledinertiaoftheeye,whichmakesapictureremainontheretinaforaboutone-sixthofasecondafterithasdisappearedfromourvision.Thismeansthat,ifweseeasuccessionofindividualpictureseachofwhichappearsonlyforafractionofasecond,they“overlap”oneanotherinourbrain;andiftheyshowconsecutivephasesofmovement,thatmovementwillappeartouscontinuous.二、知识归纳(一)prove的用法1.用作及物动词，表示“证实，证明”(giveproofto,showtobetrue)后接名词、代词、复合宾语、宾语从句等，可用于被动语态。Whocanproveit?谁能证实这一点？Thesoldiershaveprovedtheircourageinbattle.用心爱心专心在战斗中，士兵们证实了他们的勇气。CanyouprovewhereyouwereonMayDay?你能证明五一那天你在什么地方吗？Lookatthesedocuments.Theywillprovethatwearetellingthetruth.看看这些文件，它们可以证明我们讲的都是事实。Weprovedhim(tobe)wrong.我们证明他错了。Thebookwasprovedtobeveryuseful.这本书被证实是有用的。2.作连系动词，意思是“(后来)被证明是或表明是”(befoundtobe,turnouttobe)接形容词、名词、不定式tobe以及of短语。Thetheoryprovedcorrect.这个理论被证明是对的。Theplanprovedagreatsuccess.这个计划结果非常成功。Theexperimentprovedtobeafailure.实验最终失败了。Thebookwillproveoflittleusetoyou.这本书会证明对你没有什么用。(二)doubt的用法归纳1.用作动词(1)怀疑；不相信a.跟名词或代词Idoubtthetru...
