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Revisionfor7AUnit3 7BUnit4 8BUnit5 9BUnit3 4 Topic2Environment sandstormmistgreenhouseeffectglobalwarmingcarbondioxide noisepollution whitepollution airpollution hurtpeople shearing increasetheriskofhighbloodpressure makepeopleeasytogetangryorimpatient influenceoursleepingquality environmentalproblems plasticbags disposalchopsticks boxusesth onceandthrowaway waterpollution water Theimportanceofwater WatercoversabouttwothirdsofEarth butmostofthewaterintheworldisnotdrinkable Peoplecannotlivewithoutwater Ifthere snowater we lldieofthirst ourlifewillbeinamess farmerscan twaterthecropsandthecropswilldie thenwe llhavenofoodtoeat firemencan tputoutfires Moreaboutwater Ifabrokentapcanfillupacoffeecupin10minutes itwillwasteover13 500litresofwaterinayear Ifyouleavethewaterrunningwhile youmight water Howcanwatergettoourhouse Waterfallsfromthecloudsasrain Itrunsintostreamsandrivers Therivercarriesittoareservoirandpeoplecleanitupinawatertreatmentworks Ittravelsinthepipesandgettoourhouse Afterpeopleusethewater itwillgotoasewageplant Itispumpedintotheriverandflowstotheseaagain Itrisesfromtheseatothesky Itfallsasrainagain Howtoprotectourenvironment Plantmoretrees Wheneveryouseelitter suchascans plasticbagsandcigaretteends onthestreet pickitup Donotthrowpaint oilorlitterdownyoursinkortoilet Pickupyourdog swaste Takehouseholdchemicals wasteoilandbatteriestothespecificplacesatofficiallandfillsites Donotthrowanyrubbishontotheground intotheriver Usebothsidesofpaper Stopusingplasticbagsforshopping Stopusingdisposalchopsticks box Walkasmuchaspossible Thegovernmentaswellasweshoulddosomething takemeasures actiontofightvariouspollutions recycle reuse Startoutsmall Theimportanceoftrees Treesarenaturalairconditioners Theycoolourcitiesandcleantheair Theytakeawaydustandchangecarbondioxideintooxygenforustobreathe Treescommunicatewithoneanother butwedon tknowhow Withouttrees soilwouldbewashedawayandtherewouldbenofoodforustoeat Withouttheshadefromtrees Earthwouldgettoohottoliveon Treesprovidealotofthingsforbothhumansandanimals TreesforEarthismakingadifference Electricity Electricityflowsthroughawire It slikewater inaway Wecanchangeelectricityintoenergysothatwecansee hearorfeelit movementenergysoundenergylightenergyheatenergy hairdryerlightbulbmicrowaveovenelectricfancamerafridgeairconditionerbatterycharger充電器vacuum吸塵器mobile cellphonemonitor driver驅(qū)動器flashdisk移動盤laptop手提電腦desktopradioricecookerwashingmachineeclecticironman madesatellite Electricityinourdailylife Electricityissaidtobeoneofthegreatestinventionsinhumanhistory Today almosteveryonearoundtheworlduseselectricityinonewayoranotherlightsourworldheatsourhomescooksourfoodgivesuslotsofhappinesscoolsourfoodinfridgedrivesundergroundtrainsmilkthecowchopthefoodWithoutelectricity ourliveswouldbeverydifficult Whatcanelectricitydoforus Howcanweuseelectricitysafely safe safely safety saveforyoursafety safetyfirst beonthesafesideHowtousericecookers washingmachinesandmicrowavessafely Tellthedifference cross across throughcross v 橫穿 橫過她們乘船過河 Theycrossedtheriverbyboat 2 across prep 橫穿 橫過20年前我橫渡了長江 IswamacrosstheChangjiangRiver20yearsago 3 through prep 貫通 直穿 透過他們緩慢地穿過森林 Theywalkedthroughthewoods inaway inthisway bytheway onthewayinaway 在某種意義上在某種意義上 這是一部好電影 Inaway itisagoodfilm 2 inthisway 用這種方法 方式用這種辦法你可以學(xué)好英語 Inthisway youcanlearnEnglishwell 3 bytheway 順便說一下順便問一下 你看過這部電影嗎 Bytheway haveyouseenthefilm 4 ontheway 在路上 在途中在回家的路上 父親給我講了一個故事 Onthewayhome fathertoldmeastory Groupwork YoucanusethefollowingpatternS1 Pollutionisworseandworseinourworld Whattopicdoyouwanttotalkabout S2 Iwanttotalkabout S1 Whatcause S2 People S1 Whatshouldwedo S2 Inorderto weshould Showtime Givesuggestions First weshould Second wecan Inaddition wehadbetter Atlast wemay maynot Showopinions Ithink Inmyopinion eyes Isuggestthatweshould suggestion 1 大量的雪使得整個地區(qū)都面臨危險(xiǎn) 2 各個家庭只能待在家里靠燒木頭取暖 3 小兔子稱起來只有0 4 2千克那么重 而且在剛出生的時候他們看不到東西 4 一天一只丹頂鶴走丟了 這個女孩子就不停的沒日沒夜的找這只丟失的鳥 5 一只成年大熊貓一天可吃多大30公斤的竹子 6 熊貓?jiān)谝巴獯蠹s可以活到20歲 但是如果在動物園他們可以大概活到35歲 7 大樹可以吸收一些有害的物質(zhì)同時釋放氧氣 8 很多生物失去了自己的家園就是因?yàn)樯值倪^度砍伐 deforestation 9 在我們?nèi)粘Ｉ钪?很多家具都是有木頭制成的