Unit6WhenwasitinventedSectionA1a2c课件人教版九年级英语全册

Unit6Whenwasitinvented?SectionA(1a-2c)ScientistsinBritainandtheUnitedSateshavemadeanewkindofenzyme(酵素)thateatsplastics(塑料).Withitshelp,plasticscanbeturnedintosmallerpartsandgoawayquickly.Scientistsbelievethat,inthefuture,itcouldsolvetheproblemofplasticpollution.TheenzymeisabletobreakdownPET,aformofplastic.PETwasfirstmadeinthe1940sandisnowwidelyusedtomakeplasticbottles.Itcanremainintheenvironmentformanyyearsandpollutelargeareasoflandandwater.SoithasalwaysbeenaheadachetodealwiththewastefromPETandotherplastics.Theresearchersmadethediscovery(发现)whileexaminingthestructureofanaturalenzymeinJapan.TheyfoundthatthenaturalenzymewashelpingtobreakdownPETplastics.So,theydecidedtomakesmallchangestotheenzymebyaddingsomeaminoacids(氨基酸).Itmadethenaturalenzyme'splastic-eatingablilitiesworkfasterandbetter.JohnMcGeehan,oneoftheleadresearchers,said,“We'vemadeanimprovedenzyme.It'sbetterthanthenaturalone.Andwearetryingtomakemoreimprovementstoit.”Hewenton,“Theenzymeisnotharmfultohumansoranimals,anditisfriendlytotheenvironment.Soweareconsideringputtingitintowideruse.”TheteamisnowtryingtomaketheenzymebreakdownPETinlargequantities(大量地).“We'llseethattheplasticpollutionmaybestoppedwiththistechnology.However,thereisstillalongwaytogo,”JohnMcGeehanadded.SustainedSilentReadingLeadinWhatarethey?Whataretheymadeof?Whatinventedskylantern?Theyareskylanterns.Theyaremadeofbamboo.ZhugeKongminginventedit.SkylanternwasinventedbyZhugeKongming.Whatwas…invented?Itwasinventedin…Whoinventedit?Itwasinvented….1885Benz1876BellInpairs:…wasinventedbefore/after…Whenweretheyinvented?Whichdoyouthinkwasinventedfirst?WasthetelephoneinventedbeforetheTV?Lookatthethingsbelow.Inwhatorderdoyouthinktheywereinvented?Discussthemwithyourgroup.Thennumberthem[1-4].1a23141b

Listenandmatchtheinventionswiththedates._____1876_____1885_____1927_____1971dacbLookattheseinventions.Doyouknowwhentheywereinvented.合学21cStudentB,coverthedates.StudentA,askStudentBwhenthethingsinthepicturein1bwereinvented.Thenchangerolesandpracticeagain.A:Whenwasthetelephoneinvented?B:Ithinkitwasinventedin1876.Therearemanykindsofmoderninventions.Canyousaysomeout?Whatisitusedfor?Itisusedfor….crossingtheriverpickingcornscatchingthemouse2aListenandnumbertheinventions[1-3]intheorderyouhearthem.Lookatthesecreativeinventions.Whatarethey?Whataretheyusedfor?Let’slisten.InventionWhatisit/aretheyusedfor?shoeswithspecialheels________thestyleoftheshoesshoeswithlightsseeing___________hotice-creamscoop________reallycoldice-cream2bchangingservinginthedarkscoopelectricityusedcoldThelastinventionisshoeswithspecial_____.Peoplecanmovetheheels_____and______.Youcan_____theheelsifyouaregoingtoa______or______themifyouarejustgoingoutfor_________.heelsdownupraisepartylowershopping拓展运用in1885KarlBenztravelA:

WhatisthiscalledinEnglish?A:Whenwasitinvented?A:Whowasitinventedby?A:Whatisitusedfor?B:Itiscalledacar.B:Itwasinventedin1885.B:ItwasinventedbyKarlBenz.B:Itisusedfortraveling.Makeconversationsusingtheinformationin2b.2cPairwork链接新知3.Thinkabouthowoftenit’susedinourdailylives.

thinkabout表示“考虑，想起”

e.g.Heisthinkingabouttravellinginthesummerholiday.他正在考虑暑假旅游的事。

Shewasthinkingaboutherchildhooddays.她正回想她的童年时期。【拓展有关think的短语】thinkof指“考虑,记忆,记起”e.g.Youthinkofeverything!你全都提到了。thinksth.over指“仔细想,审慎思考,作进一步考虑”e.g.PleasethinkoverwhatIsaid.请仔细考虑我说的话。useful

inventionslistening

heatwereinventedby随堂检测二、CompletethedialogueA:Look!Thislookssointeresting!B:Ah,it’sagreatinventionofChina.A:Really?When______it_________?B:Ithinkit_______________inHanDynasty.(汉朝)['daɪnəstɪ]

A:Who____it_________by?B:It_____________byZhangHeng.A:What_____it_______for?B:Guess!A:____it________forholdingwater?B:No.It____________fortestingearthquake.A:Wow!It’sreallyamazing!['ə:θkweik]

wasinventedwasinventedisusedusedIsisusedinventedwasinventedwasSummary

重点词组:1.beusedfor2.thestyleof3.runon