高中英语Unit 21 Lesson 1 Chewing Gum 2课件北师大版选修7.ppt

Unit21HumanBiologyLesson1ChewingGumWarm-upExercise1ReadtheKeyWordsandthenlabelthepartsofthebodyinthediagramankle,brain,eye,heart,kidneys,bone,knee,liver,lungs,muscle,ribs,skin,Spine,stomach,wrist,fingersAnswers:1.brain2.lungs3.heart4.liver5.stomach6.kidneysExercise2ListenandguesswhichpartofthebodyareBeingdescribed.Answers:1.brain2.heart3.lungs4.eye5.liverExercise3workinpairsandtestyourbody“machine”Memory.Hearing.Heart.Writedownfivetelephonenumbersandgivethemtoyourpartnertolookatfor30seconds.Howmanycanhe/sheremember?Everybodyintheclasssitsinsilencefor30seconds.Writedowneverysoundyoucanhear.Compareyourlistwithyourpartner.Findthepulseonyourpartner’swrist.Howmanytimesdoeshis/herheartbeatinoneminute?Ishe/shemoreorlessrelaxedthanyou?exercise4:givestudentsafewminutestodothequestionnaireinpairs.Thenchecktheirscoresonpage103.1.Howmanyhoursdoyousleeppernight?a)under6hoursb)about7or8hoursc)morethan9hours2.Howoftendoyoucleanyourteech?a)onceadayb)twiceadayc)aftereverymeal3.Howoftendoyoudophysicalexercise,enoughtomakeyououtofbreath?a)neverb)onceaweekc)twoorthreetimesaweek4.Howoftendoyoueatsweetsorchocolate?a)neverb)sometimesc)everyday5)Howmanypiecesoffreshfruitdoyoueatperday?a)oneortwob)morethantwoc)noneLesson1ChewingGumExercise1discussinpairsandanswerthefollowingquestions1.Whatdoyouthinkofchewinggum?isitgoodorbadforyou?2.Doyouoryourfriends/familybuyit?why?3.Whatdoyoudoafterchewingit?Exercise2lookatthetitleofthemagazineartricleandpredictwhichissuesmaybecoveredinthearticle.Thenreadthearticlequicklyandseeifanyofyourguessesareright.Exercise3completethetable:advantagesdisadvantagesFightingbadbreath,MakingdigestionlesseffectiveHelpingpreventtoothdecay,Strainingthestomachandleadingtostomachirritationsorulcershelpingpeopleloseweight,MakingpeopleneglectbrushingtheirteethhelpingsmokersgiveupsmokingExercise4answerthequestions1.Howseriousistheproblemofbadbreath?2.Whatisaddedtosugar-freechewinggumwhichmayhelppreventtoothproblems?3.Accordingtooneresearchproject,whatisonewayofburning70kilocalories?4.Whatwouldbetheeffectonthestomachofconstantchewing?5.Whatotheractivitiesarestatedthatarebetterthanchewinggum?Itisaproblemfor50%oftheworld’spopulation.ChlorophyllChewing100timesperminutefor12minutes.Thestomachmaybecomestrainedandeventuallythiscouldleadtostomachirritationsorulcers.Brushteethregularly,eathealthyfoodsavoidingsugar,neverstartsmoking,andchewamintleaf.Languagepoints1)Dietspecialistsregularlyinformusthatitisimportanttochewourfoodproperly.营养学家们经常告诫我们一定要正确咀嚼食物。句型:Itis+adj.+todosth.It是形式主语,动词不定式是真正的主语.2)itwillhelpourbodiesdigestitbetter.这样才能有助于身体更好地消化食物.helpsb.dosth.3)doeschewinggumhaveanyeffectonthisprocess?咀嚼口香糖对这一过程有什么影响呢?Haveanyeffecton…4)oneobviousbenefitofchewinggumisthatitfightsbadbreath.一个显而易见的好处是嚼口香糖能清除口腔异味.that引导的是表语从句.badbreath口腔异味5)ifithasgreenplantsmaterialsaddedtoit.havesthdone.addto6)toothdecay蛀牙7)washaway清除8)loseweight减肥9)carryout进行,执行,开展10)upto一直到,等于11)bynow到如今12)today,therearegumproductsthathelpsmokersgiveuptheirbadhabit.that引导的定语从句修饰gumproducts,在从句中作主语.giveup放弃13)thenegativesideof14)theproductionofstomachacidanddigestivejuices15)ithasalsobeenproventhatchewinggumforlongperiodsoftimemeansthatthebodydoesnothavetimetorest.第一个that引导的宾语从句，作proven的宾语第二个that引导也是宾语从句，作means的宾语16)leadto17)some…others….18)sendoutv.发送,派遣,放出19)insteadof代替20)brushone’steeth刷牙21)thenumberof…的数目；数量22)onbalanceadv.总而言之grammarconditionalsrevisionExercise6matchtheconditionalsentencesinitalicsinthetextwiththefollowingtypes:Zeroconditional1stconditional2ndconditional3rdconditionalWhichofthesentencesinitalicstalkaboutthepast,thepresentandthefuture?1.Theysuggestthatifwechewourfooduntilitissoftinourmouthsandthenswallowit,itwillhelppurbodiesdigestitbetter.2.Accordingtosomedoctors,ifthesepeopleweretochewsugar-freegum,itwouldhelpfightthisembarrassingcondition.3.Recently,somedentistshavealsoclaimedthatsugar-freegum,ifithasgreenplantsmaterialsaddedtoit,helpstostoptoothdecay.4.therefore,theysay,ifpeopleweretochewsugar-freegumafterameal,itwouldhelppreventtoothtrouble.5.Furtherresearchhasbeencarriedout,whichshowsthat,ifyouhadchewedsugar-freegumregularlyforthelastyear,itispossiblethatyouwouldhavelostupto5kilosbynow.1stconditional,future2stconditional,futurezeroconditional,present2stconditional,future3stconditional,past6.Theyfoundifpeoplechewed100timesperminutefor12minutes,70kilocalorieswereburned.7.Oneformersmokerhasappearedinanad.Saying,”ifIhadusedthischewinggumwhenIwasgivingupsmokingtenyearsago,Iwouldhavebeenmoresuccessfulatquittingquicklyandmuchhealthiertoday.”8.Ifwechewgum,itwillcauseourbodiestobelievewearedigestingfoodandourstomachswillproducedigestivejuicesunnecessarily.9.Ifthisisthecase,thestomachmaybecometense.10.Theyarguedthatifdentistsencourageditsuse,thewrongmessagewouldbesentoutandchildrenmightchewguminsteadofbrushingtheirteeth.11.Unlesswearecareful,thenumberofyoungpeoplewithbadteethwillriseandthiswillbecomeaseriousproblem.2stconditional,present1stconditional,future3stconditional,pastzeroconditional,present2stconditional,future1stconditional,futureExerc