78unit 4 topic 1 section d

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1、Unit4AmazingScienceTopic1Whenwasitinvented?SectionDWhat’situsedfor?It’susedforlisteningtomusic.What’sitmadeof?It’smadeofplastic.Wherewasitinvented?ItwasinventedinKorea.Whenwasitinvented?Itwasinventedin1998.What’situsedfor?It’susedforcommunicatingeasily.W

2、hat’sitmadeof?It’smadeofplasticandmetal.Wherewasitinvented?ItwasinventedinAmerica.Whenwasitinvented?Itwasinventedin1973.Whatmethoddidyouusetofindyourlostcellphone?GPSislikeaman-madestar.Wecanuseitatanytime,inanyplaceandinanyweathertofindoutourposition.Thee

3、arlyexplorersusedthestarsaslandmarkstoknowwheretheywereandinwhichdirectiontheyweregoing.Thismethodworkedwellatnightaslongastheweatherwasgood.Butitdidn’tworksowellduringtherestofthetime.Let’susetheGPS.n.探险者，勘探者1.Howdidtheearlyexplorersknowwheretheywere?They

4、foundoutwheretheywerebyusingstars.2.What’sthedisadvantageofusingthestarsasguidingmarks?Itsdisadvantageisthatitdidn’tworkwellwhentheweatherwasbadandthestarscouldnotbeseen.3.WhatisaGPS?Isitusefultouse?Itislikeaman-madestar.Wecanuseitatanytime,inanyplaceandin

5、anyweathertofindoutourposition.Itisveryuseful.4.WhatdoyouthinktheGPSwillbeusedforinthefuture?…ReadthepassageanddiscussthequestionsonPage88.Keywordsexploreexplorer,markfindout,in…directionworkwell,aslongastherestofthetimesolve,like,use,theshapeofgreatinvent

6、ionn.标示，记号，符号v.做记号，做标记Retellit!根据首字母提示，完成短文。ThankstoGPS,wecanexactlyknoww_____wearenow.GPSislikeaman-made“star”.Itcanbeu____inanyplaceandanyweatherconditiontofindoutourp________.Inthepast,theearlyexplorershadtousestarsinthes____totellthemwheretheywere,howe

7、ver,thismethoddidn’tworkwellwhentheweatherwasbad.SoGPSisagreatinventionthatcanhelphumanstobettere________ourplanets.hereositionsedkyxploreExerciseGrammarPassiveVoice(Ⅱ)TheradiowasinventedbyGuglielmoMarconiin1895.Whenwasthedigitalcameradeveloped?Wherewasitd

8、eveloped?Whatisarocketusedfor?Itwasdevelopedinthe1970s.ItwasdevelopedinJapan.Itisusedforsendingsatellitesorspaceshipsintospace.FunctionsIwishIcouldgointospacesomeday.Ihopeyourdreamwillcometrue.It’ssaidthathei