高中英语Unit 4 Exploring plants-using languageVIP专享VIP免费

Unit4Exploringplants-usinglanguagePartOne:TeachingDesignPeriod3:AsamplelessonplanforUsingLanguage(FLOWERSANDTHEIRANIMALPOLLINATORS)AimsTohelpstudentsreadthepassageFLOWERSANDTHEIRANIMALPOLLINATORSTohelpstudentstousethelanguagebyreading,listening,speakingandwritingProceduresI.WarminguptakingaquizTakethefollowingsentencesindirectspeechandputthemintoindirect(orreported)speech.Shesaid,"I'veworkedheresinceIleftmylastjob."Shetoldmethatshehadworkedtheresinceshehadleftherlastjob.Yousaid,"Iwillhelpyou!"Yousaidyouwouldhelpme!Sheaskedme,"Whenarewegoingtoleave?"Sheaskedmewhenweweregoingtoleave.Petersaid,"Imaybringsomeonewithmetotheparty."Petersaidhemightbringsomeonewithhimtotheparty.Myfriendsaid,"Iwillhavefinishedmyhomeworkbythetimeyouarrive."MyfriendtoldmehewouldhavefinishedhishomeworkbythetimeIarrived.Markaskedme,"WhydoyouwanttostudyRussian?"MarkaskedmewhyIwantedtostudyRussian.Marciasaid,"Ihavebeenwaitingforyouforoveranhour."Marciasaidshehadbeenwaitingformeforoveranhour.Alisonsaid,"Ihadeatenbeforeyouarrived."AlisontoldmeshehadeatenbeforeIhadarrived.Lennysang,"Iwanttogetaway,Iwanttoflyaway"Lennysanghewantedtogetaway,hewantedtoflyaway.Jasonaskedme,"Areyoucomingwithme?"JasonaskedmeifIwascomingwithhim.II.LookingandtalkingNowgotopage36.Lookatthephotosandlisteningtometalkingtoyouaboutthelivingstonesplant,Refflesiaandpitcherplants.Pitcherplants(orpitfalltraps)arecarnivorousplantswhoseprey-trappingmechanismfeaturesadeepcavityfilledwithliquid.Insectssuchasfliesareattractedtothiscavity,oftenbyvisualluressuchasanthocyaninpigments,andnectarbribes.Thesidespfthepitcherareslipperyandtheyarealsogroovedinsuchawaysoastoensurethattheinsectscannotclimbout.Theliquidcontainedwithinthepitchertraps,drowns,andgraduallydissolvesthebodyoftheinsect.Thismayoccurbybacterialaction,orbeduetoenzymessecretedbytheplantitself.Furthermore,somepitcherplantscontainmutualisticinsectlarvae,whichfeedontrappedprey,andwhoseexcretatheplantabsorbs.Whateverthemechanismofdigestion,thepreyitemsareconvertedintoa'soup'ofamino用心爱心专心116号编辑acids,peptides,phosphate,ammoniumandurea,fromwhichtheplantobtainsitsmineralnutrition(particularlynitrogenandphosphorus).Likeallcarnivorousplants,theyoccurinlocationswherethesoilistoopoorinmineralsand/ortooacidicformostplantstobeabletogrow.Rafflesiaisagenusofparasiticflowers.Itcontains18species(includingfourincompletelyknownspeciesasrecognizedbyMeijer1997),allfoundinSouth-EastAsia,ontheMalayPeninsula,Borneo,SumatraandKalimantan,andthePhilippines.Theflowershavenoleavesandhardlyanystem,justahugespeckledfive-petaledflowerwithadiameteruptoonemetre,andweighingupto10kg.Eventhesmallestspecies,R.manillana,has20cmdiameterflowers.Theflowerssmelllikerottingmeat,henceitslocalnameswhichtranslateto"corpseflower"or"meatflower".Itisparasiticonavine,spreadingitsrootsinsidethevine.Thefruitiseatenbytreeshrews.RafflesiaisaofficialstateflowerofSabahinMalaysia.ThespeciesRafflesiaarnoldiiistheworld'slargestsingleflower.ItwasdiscoveredintheIndonesianrainforestbySirThomasStamfordRafflesandDr.JosephArnoldin1818.Theworld'slargestinflorescenceisbornebytheTalipotpalm(Coryphaumbraculifera).ThelargestunbranchedinflorescenceistheTitanArum(Amorphophallustitanum)fromthefamilyAraceae.NowyouaregoingtolistentoatalkbyMark,GordonandAndreatellingaboutthesethreeunusualplantsandcompletethetwochartsonpage36.III.ReadingforformsReadth...