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Unit2SavingtheEarthTopic3Whatcanwedoathometoprotecttheenvironment?SectionDGrammarCompoundSentenceRecyclingcanprotecttheenvironment,_______

itcansavemoney,too.Somethingswehavedonearegoodfortheearth_________somearebad.Weshoulddoeverythingtoprotectit,________w

e’llbepunishedandloseourhome.…peopleproducepowerfromcoal,_______itisverydirtyandcausesacidrain.andwhileorbut()1.Helpotherswhene

veryoucan_____you’llmaketheworldanicerplacetolivein.A.orB.andC.butD.while()2.Crosstheroadcarefully,________you’

llkeepyourselfsafe.A.soB.orC.butD.and()3.Hurryup,________you’llbelatefortheconcert.A.orB.soC.butD.and()4.---Tell

ussomethingaboutCanada,OK?---I’msorry.________Jack_______Ihaveeverbeenthere.A.Either,orB.Notonly,butalsoC.Both,andD.Neither,nor()5.Ialwa

ysenjoyvisitingLondon,______Iwouldn’tliketolivethere.A.becauseB.soC.butD.andChoosethebestanswer.BDADCFunctionsWoul

dyouliketobea__________person?First,yououghtto_________theelectricitywhenyouleavearoom.__________saidthandone.Actionspeak_________thanwords.Thetrain

can_________atopspeedof431kmperhour.greenershutoffEasierlouderreach1.WhatarethethreeR’s?2.Whichmeans“makesomethinglessorsmaller”?3.Whats

houldwereduce?4.Whichmeans“useitagain”?5.Whatshouldwereuse?6.Whatshouldwedoaboutrecycling?Reduce,reuseandrecycle.Red

uce.Weshouldreducethethingswhichpeoplecanuseonlyonce.Reuse.Weshouldreuseplasticbags.Weshouldcollectwastepaperorsoftdrinkcans,andsortthemsothattheyca

nberecycled.Canyouanswerthem?•Throwtherubbishhereandthere.•Don’tspitinapublicplace.•Drawabeautifulpictur

eonthepublicwalls.•Don’tthrowthingsawayiftheycanbereused.•Gotoschoolbybikeinsteadofbybus.•Collecttherubbishandtrytosortit.•Pourdirt

ywaterintoriversdirectly.•Turnoffthelightswhenyougoout.Whichoneisright?Howimportantistheforest?Forests

arethelungsoftheearth.RemovecarbondioxidefromtheairMakeoxygenCutdownBuildhousesPlanttreesHowdoyouunderstand“Forestsarethelungsoftheea

rth”?Forestscanremovecarbondioxidefromtheairandmakeoxygen.RetellitWhatdifficultiesdotreeplantersfacewhentheyplanttrees?(1)Theweat

hermaybeveryhotanddryoritmaybeverycoldandwet.(2)Thereareoftenmanyinsectsthatbitetheseplantersontheirlegs,arms,andf

aceswhiletheywork.(3)Theycarryheavybagsofsmalltrees,andworkinginthemountainscanbedangerous.adj.干燥的，雨少的

，干性的v.使……干，弄干，擦干Whydotheyplantdifferentkindsoftrees?Theyplantdifferenttypesoftreessothatbirdsandanimalscanliveinthef

orests.•Whatwillhappenifwedonotplantnewforests?Theforestswillbecomelessandless.Wecannotbreathewithoutthem.•Wouldyouliketobeatreeplanterwhenyouareol

der?Whyorwhynot?…Haveatry1.Answerthefollowingquestionstoseehowgreenyouare.FindingtheGreenestPerson=2=1=00—

4Youhavenotstartedturninggreenyet!5—9Youarepalegreen.10—13Youaremediumgreen.Tryharder.14—18Youarebrightgreen,butdonotstoptrying.Score:=31、Doyo

uusuallyrecyclenewspaperorcans?Often.Seldom.Never.2.Whatdoyouusuallytake?Abath.Ashower.3.Whenyouhaveashortjourney,howdoyouus

uallygothere?Walkorrideabike.Gobycar.Gobybus.4.Whatdoyouusuallydowhenyouseeotherslittering?Stopthem.Pickthelitterup.Don

othing.5.Howoftendoyouusepapertowels?Often.Seldom.Never.6.Howoftendoyoueatfastfood?Often.Seldom.Never.7.W

hattypeofbagsdoyouuseforshopping?Basketsorclothbags.Reusedplasticbags.Newplasticbags.8.Howoftendoyouturnoffthelightswhenyou

leavearoom?Nearlyalways.Seldom.Never.Welearn:1.Somewords:dry2.Somephrases:providesth.todosth.;facedifficulties;event

hough3.Somesentences:(1)Withoutthem,itcannotbreathe.(2)Theyplantdifferenttypesoftreessothatbirdsandanimalscanliveinthef

orests.Wecan:1.Usethecompoundsentencecorrectly.2.Realizetheimportanceoftheforest.Summary•Read1a.•Memorizetheusefulexpressionsandkeysentenceswh

ichwelearninthistopic.•FinishSectionDinyourworkbook.•Reviewwhatwelearninthisunit.