安徽省滁州市第二中学高中英语 Unit22 Environmental Protection The Eleventh Period Check your progress教案 北师大版选修8VIP免费

安徽省滁州市第二中学高中英语Unit22EnvironmentalProtectionTheEleventhPeriodCheckyourprogress教案北师大版选修8Teachinggoals教学目标1.TargetLanguage目标语言重点词汇和短语overpopulation,flood,earthquake,typhoon,poverty,carryon,takeup,putaside,cutdown,setup,comeupwith2.Abilitygoals能力目标Learnwhyrainforestsareimportant.3.Learningabilitygoals学能目标ByreadingthearticlestudentswilllearnthatrainforestsplayaninvaluableroleinsustaininglifeonEarth.StepIRevisionGooverthepassive.1.AskstudentstoreadthetextinEx6onPage94.2.AskstudentstostatethereasonsforusingthepassivevoiceinEnglish.StepIIAbriefintroductionofrainforestsFirstmakeabriefintroductionofrainforests.Thenstudentsaregivensevenminutestoreadthearticletogetamainideaofthearticle.T:Inthisclasswearegoingtolearnsomethingaboutrainforests.Beforereadingthetext,lookatthebriefintroduction.(ShowthefollowingonthePowerPoint.)Teacherasksthequestions,studentsreadthematerialstogether.WhatisaRainforest?Rainforestsareverydense,warm,wetforests.Theyarehavens(安身之处)formillionsofplantsandanimals.RainforestsareextremelyimportantintheecologyoftheEarth.TheplantsoftherainforestgeneratemuchoftheEarth'soxygen.Theseplantsarealsoveryimportanttopeopleinotherways;manyareusedinnewdrugsthatfightdiseaseandillness.StrataoftheRainforestDifferentanimalsandplantsliveindifferentpartsoftherainforest.Scientistsdividetherainforestintostrata(zones)basedonthelivingenvironment.Startingatthetop,thestrataare:EMERGENTS:Gianttreesthataremuchhigherthantheaveragecanopyheight.Ithousesmanybirdsandinsects.CANOPY:Theupperpartsofthetrees.Thisleafyenvironmentisfulloflifeinatropicalrainforestandincludes:insects,birds,reptiles,mammals,andmore.UNDERSTORY:Adark,coolenvironmentundertheleavesbutovertheground.FORESTFLOOR:Teemingwithanimallife,especiallyinsects.Thelargestanimalsintherainforestgenerallylivehere.AnimalsoftheRainforestsAnincrediblenumberofanimalsliveinrainforests.Millionsofinsects,reptiles,amphibians,birds,andmammalscallthemhome.Insectsarethemostnumerousanimalsinrainforests.Tropicalrainforestshaveagreaterdiversityofplantsandanimalsthantemperaterainforestsoranyotherbiome.Intemperaterainforests,mostoftheanimalsaregrounddwellersandtherearefeweranimalslivingintheforestcanopy.WhereareRainforests?TropicalrainforestsarefoundinabeltaroundtheequatoroftheEarth.TherearetropicalrainforestsacrossSouthAmerica,CentralAmerica,Africa,SoutheastAsiaandAustralia(andnearbyislands).TemperaterainforestsarefoundalongthePacificcoastoftheUSAandCanada(fromnorthernCaliforniatoAlaska),inNewZealand,Tasmania,Chile,Ireland,ScotlandandNorway.Theyarelessabundantthantropicalrainforests.RainfallItisalmostalwaysraininginarainforest.Rainforestsgetover80inches(2m)ofraineachyear.Thisisabout11/2inches(3.8cm)ofraineachweek.Therainismoreevenlydistributedthroughouttheyearinatropicalrainforest(eventhoughthereisalittleseasonality).Inatemperaterainforest,therearewetanddryseasons.Duringthe"dry"season,coastalfogsuppliesabundantmoisturetotheforest.TemperatureThetemperatureinarainforestneverfreezesandnevergetsveryhot.Therangeoftemperatureinatropicalrainforestisusuallybetween75°Fand80°F(24-27°C).Temperaterainforestsrarelyfreezeorgetover80°F(27°C).TheSoilinaRainforestThesoilofatropicalrainforestisonlyabout3-4inches(7.8-10cm)thickandisancient.Thickclayliesunderneaththesoil.Oncedamaged,thesoilofatropicalrainforesttakesmanyyea...