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Unit2SavingtheEarthTopic2Alltheseproblemsareveryserious.SectionApollutionmanytreescutdownforestsgonewashtheearthaway冲走changeintodesert转换成，

变成沙漠e.g.Alotofrichlandhaschangedintodesertbecausepeoplehavecutdowntoomanytrees.sandstormscomeintobeingn.沙尘暴Theboyandgirlsaretalkingabout—————.A.dif

ferenttypesofsandstormsB.thereasonsforsandstormsC.sandstormsindifferentcities1bListento1aandchoosethebestanswer.Focusonthemainideaoftheconv

ersationwhenyoulistenforthefirsttime.√Listenandanswerthequestions1.What’stheweatherliketoday?It’sbad.Thewi

ndissostrong.Andthesandreallyhurtsface.2.Whatcausesthesesandstorms?Peoplehavecutdowntoomanytrees.Asaresult,alo

tofrichlandhaschangedintodesert.3.Dowestillneedtodosomethingtoprotecttheenvironment?Yes,wedo.Althoughweha

vebuilt“TheGreenGreatWall”,westillneedtodosomethingtoprotecttheenvironment.conj.虽然，尽管，即使n.沙somebody,someone,something,somewhereanybody,a

nyone,anything,anywherenone,nobody,nothing,nowhereeverybody,everyone,everything,everywhere一般情况下用于肯定句一般情况下用于否定

句和疑问句表否定含义可用于各种句式theindefinitepronounandadverb1.Ihave____totellyou.A.importantsomethingB.somethingimportantB形容词修饰不定代词和不定副词时，要放在不定代词/不定副词之后

Doyouknow?2.Everybody___readyforthematch.A.isB.areA不定代词作主语时，谓语动词要用单数。1cRead1aandcompletetrees’functions.A.Treescanstopthewindfromblo

wingtheearthaway.B.Alotofwatercanbesavedbyforests.C.Theycanalsostopthewaterfromwashingtheearthaway.Tree’sfunctionsK:wind;sand;anyt

hingM:sandstormsJ:cutdown;asaresult;changeintoM:affectJ:stop…from…;blow…awayK:canbesavedJ:wash…awayK:isharmfult

o;although;dosomethingActoutthedialoginpairs2Completethesentenceswiththecorrectformsofthegivenphrasesinthebox.asaresu

lt,changeinto,dosomething,stop…from,blow…away1.Peoplehavecutdownsuchalargenumberoftreesthattheland_____________________desert.2.Therearefewertreeslef

t,sothewindalways_______theearth________.3.Airpollutionhasbecomeaseriousproblem,sowemust______________toreduceit.4.we

shouldtryourbestto_________people________cuttingdownthetrees.5.Inthefuture,humanbeingscanprotectthetreeswell._____________,anima

lswillliveahappylifeintheforest.haschangedintoblowsawaydosomethingstopfromAsaresult3Doyouknowhowsandstormscomeintobeing?Nu

mberthepicturesandtalkaboutthesandstormingroups.()()()()()()415362washtheearthawaymanytreeschangeintodesertfor

estsgonesandstormscomeintobeingcutdowntrees4A.Listentothepassageandcirclethephrasesyouhear.•becomeweaker•destroytheenvironment•dis

appearrapidly•ontheearth•enoughbambootoeat4B.Listenagainandfillintheblanks.1.Nowsomekindsofanimalsarebecoming___________________.2.Some

animalsare_______________dyingoutcompletely.3.Inthepast,pandaslivedaquietlifeandhad______________food.4.Humanshave_____________

_______theimportanceofprotectinganimals.5.Weshould________________toprotectthem.doourbestindangerofplent

yofcometounderstandfewerandfewer1.Lily,wouldyoulike___________todrink?2.Cindyisverybusynow.Sheneeds___

____tohelpher.3.Isthere_________wrongwithyourcomputer?4.Jimlookedforhispencil-box____________,buthedidn’tfindit.5.Istayedatho

melastweek.Ididn’tgo__________.Usesomeone,something,anything,somewhere,anywheretofillintheblanks.somethingsomeoneanythingsomewhere

anywhereWelearn:1.Somewords:sand,although2.Somephrases:changeinto,humanbeing3.Somesentences:(1)Asaresult,alotofrichlandhasc

hangedintodesert.(2)Treescanstopthewindfromblowingtheearthaway.Wecan:1.Usetheindefinitepronounandadverb.2.Talkaboutthesandstormanditsharm.S

ummary1.Read1a.2.Memorizetheusefulexpressionsandkeysentenceswhichwelearntoday.3.FinishSectionAinyourworkbook.4.Pre

viewSectionB.