2019-2020年高一英语下册 Unit16 Scientists at work(备课资料)教案 大纲人教版第一册

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1、2019-2020年高一英语下册Unit16Scientistsatwork(备课资料)教案大纲人教版第一册一、异域风情1.AlexanderBell'sGreatInventionMostpeopleknowthatAlexanderGrahamBellinventedthetelephone.Butnotmanyknowaboutaccothertalkingdeviceheinventedjustfouryearslater,in1880.Hecalledthedevicethephotophone.‘Photoph

2、one’esfromtheGreekwordsfor‘light’and‘sound’.Thephotophonedidnotuseelectricitytocarrysoundoverwiresbetweentwopeople.That'swhatatelephonedoes.Instead,thephotophoneusedabeamofsunlighttravellingthroughtheair.Withhisinvention,Bellcouldactuallytransmithumanspeechonabeam

3、oflight.Todoso,hespokeclosetoathinmirrorthatwasreflectingsunlight.Thevibrationsofhisvoicecausedthemirrortovibrate,andthevibratingmirrorcausedthelighttovibrate.Thevibratinglighthitalight-sensitivecellinareceiverplacedsomedistanceaway.Thecellchangedthelightpatternsi

4、ntoelectricalsignals.Earphoneschangedthesignalsbackintosounds.Bellbelievedthathisideaoftalkingonabeamoflightwouldprovetobeimportant.Heoftencalledthephotophonehisgreatestinvention.Eventhoughthephotophonedependedonasourceofenergythatwasnotconstant—thesun—Bellwasn'ta

5、bitdiscouraged.Hefeltsurethatpeoplewouldonedaytalkusingbeamsoflight.TwomuchmorerecentdevelopmentsmadeBell'sdreametrue.In1960,ascientistbuiltthelaser.Alaserproducesahighlyconcentratedbeamoflight.Shortlyafterward,otherscientistsdevelopedanewkindofopticalfibre.Theopt

6、icalfibreisaglassthread.Thenewfibrecouldcarrylightbeamslongdistances—asfarasseveralmiles.2.WhoInventedMotionPictures?Thepleasureswhichamoviefilmoffterstooureyeshavebeenpaidforwiththelossofsightofamanwhosenameishardlyknownoutsidetheannalsofscience—JosephPlateau,aBe

7、lgianprofessorborninBrusselsin1801.Hestudiedthemechanismofsight,beginningaseriesofmostdangerousexperimentsattheageof28bystaringintothesunfor25secondstoseewhattheeffectonhiseyeswouldbe.Hewasblindfornearlyamonth.Buthewentonexperimenting,increasingthelengthoftimeduri

8、ngwhichhelookedintothesun,knowingthatintheendthiswouldcosthimhissight.Attheageof42hewaspletelyandincurablyblind;thesunhaddestroyedtheretinaofhiseyes.But