英语北师大版选修7 Unit21 Lesson 1 Chewing Gum PPT2.ppt

unit21humanbiology lesson1chewinggum warm up exercise1readthekeywordsandthenlabelthepartsofthebodyinthediagram ankle brain eye heart kidneys bone knee liver lungs muscle ribs skin spine stomach wrist fingers answers 1 brain2 lungs3 heart4 liver5 stomach6 kidneys exercise2listenandguesswhichpartofthebodyarebeingdescribed answers 1 brain2 heart3 lungs4 eye5 liver exercise3workinpairsandtestyourbody 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 none lesson1chewinggum exercise1discussinpairsandanswerthefollowingquestions 1 whatdoyouthinkofchewinggum isitgoodorbadforyou 2 doyouoryourfriends familybuyit why 3 whatdoyoudoafterchewingit exercise2lookatthetitleofthemagazineartricleandpredictwhichissuesmaybecoveredinthearticle thenreadthearticlequicklyandseeifanyofyourguessesareright exercise3completethetable exercise4answerthequestions 1 howseriousistheproblemofbadbreath 2 whatisaddedtosugar freechewinggumwhichmayhelppreventtoothproblems 3 accordingtooneresearchproject whatisonewayofburning70kilocalories 4 whatwouldbetheeffectonthestomachofconstantchewing 5 whatotheractivitiesarestatedthatarebetterthanchewinggum itisaproblemfor50 oftheworld spopulation chlorophyll chewing100timesperminutefor12minutes thestomachmaybecomestrainedandeventuallythiscouldleadtostomachirritationsorulcers brushteethregularly eathealthyfoodsavoidingsugar neverstartsmoking andchewamintleaf languagepoints 1 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 grammar conditionalsrevision exercise6matchtheconditionalsentencesinitalicsinthetextwiththefollowingtypes 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 future 2stconditional future zeroconditional present 2stconditional future 3stconditional past 6 theyfoundifpeoplechewed100timesperminutefor12minutes 70kilocalorieswereburned 7 oneformersmokerhasappearedinanad saying ifihadusedthischewinggumwheniwasgivingupsmokingtenyearsago iwouldhavebeenmoresuccessfulatquittingquicklyandmuchhealthiertoday 8 ifwechewgum itwillcauseourbodiestobelievewearedigestingfoodandourstomachswillproducedigestivejuicesunnecessarily 9 ifthisisthecase thestomachmaybecometense 10 theyarguedthatifdentistsencourageditsuse thewrongmessagewouldbesentoutandchildrenmightchewguminsteadofbrushingtheirteeth 11 unlesswearecareful thenumberofyoungpeoplewithbadteethwillriseandthiswillbecomeaseriousproblem 2stconditional present 1stconditional future 3stconditional past zeroconditional present 2stconditional future 1stconditional future exercise7readthesentences dotheydescribesituationsthatare a trueorcouldpossiblyhappen b imaginary unrealorcontrarytofacts 1 ifihadusedthischewinggumwheniwasgivingupsmokingtenyearsago iwouldhavebeenmoresuccessfulatquittingquicklyandmuchhealthiertoday 2 ifpeopleweretochewsugar freegumafterameal itwouldhe