SectionA第三课时(3a-4c)Unit13We’retryingtosavetheearth.sharkn.鲨鱼finn.（鱼）鳍crueladj.残酷的；残忍的harmfuladj.有害的3a3aReadthepassageaboutsharksandcompletethefactsheetbelow.WheresharkfinsoupispopularNumberofsharkscaughtandtradedeveryyearHowmuchthenumbersofsomekindsofsharkshavefalleninthelast20to30yearsTwoenvironmentalgroupsagainst“finning”soalthoughifbutwhen1.Manypeopledonotrealizetheyarekillingawholeshark___________theyenjoyabowlofsharkfinsoup.2.Sharksareatthetopofthefoodchain,_______theirnumbersdrop,theocean’secosystemwillbeindanger.whenso3b3bReadthepassageagainandfillintheblankswiththewordsinthebox.3.Manythinkthatsharksaretoostrongtobeendangered,____________theyarewrong.4.__________therearenoscientificstudiestosupportthis,alotofpeoplebelievethatsharkfinsaregoodforhealth.5.Sharksmaydisappearoneday__________wedonotdosomethingtostopthesaleofsharkfins.butAlthoughifGrammarFocusWe’retryingtosavetheearth.PresentprogressiveTheriverusedtobesoclean.UsedtoTheairisbadlypolluted.PassivevoiceNoscientificstudieshaveshownthatsharkfinsaregoodforhealth.PresentperfectWeshouldhelpsavethesharks.ModalverbsJoe:__________youever__________(take)partinanenvironmentalproject?Ken:Yes,Ihave.I_____(help)withaClean-UpDaylastyear.Itwas______________(consider)thebiggestclean-upprojectthiscity______ever______(have).Joe:Howmanypeople__________(take)part?Havetakenhelpconsideredtobehadhadhavetaken4a4aFillintheblankswiththecorrectformsoftheverbsinbrackets.Ken:I__________(think)morethan1000people_________(come)tohelpout.Joe:That’sfantastic!Iguesseveryoneinthiscityis___________(try)toimprovetheenvironment.Ken:Yes,wecan’taffordto___________(wait)anylongertotakeaction!thinkhavecometryingwaitingcanmay/mightcouldhavetoshouldmustwould4b4bFillintheblankswiththeappropriatemodalverbsfromthebox.People__________thinkthatbigthings__________bedonetosavetheearth.Manyforgetthatsavingtheearthbeginswithsmallthings.Forexample,you__________saveelectricitybyturningoffthelightswhenyouleavearoom.You________al...
