Aslongaswehavebeenonearth,wehaveusedtheseaaroundus.Wetakefromtheocean,andwegivetoit.
Wetakefishesfromtheocean--millionsofkilogramsoffish,everyyear,tofeedmillionsofpeople.Weevenusetheirbonesforfertilizer.Wetakemineralsfromtheocean.Onewaytogetsaltistoplaceseawaterinashallowbasinandleaveituntilitevaporates.Alongwithsalt,othermineralsareleftafterevaporation.Muchgoldandsilverdriftdissolvedinthewatersofthesea,too1.Buttheseadoesnotgivethemupbysimpleevaporation.Othergiftsfromtheseaarepearls,spongesandseaweed.Pearlsbecomejewelry.Naturalspongesbecomecleaningaids.Seaweedbecomesfoodofmanykinds一evencandy,andicecream—aswellasmedicine.Believeitornot,freshwaterisanothergiftfromthesea.Wecannotdrinkoceanwater.Someofitscontentsmaycauseillness.Butoceanwaterbecomesfreshwaterwhenthesaltsareremoved.Inthefuture，wewillfindourselvesdependingmoreandmoreonfreshwaterfromthesea.
http://www.123zcyy.com/Theseagivesusfood,fertilizer,minerals,water,andothergifts.Whatdowegivethesea?Garbage.Wepollutetheoceanwhenweuseitasagarbagedump.Hugeasitis,theoceancannotholdallthewaterthatwepourintoit.Dumpinggarbageintotheoceaniskillingoffsealife.Yetastheworldpopulationgrows,wemayneedtheseaanditsgiftsmorethanever.
Wearefinallylearningthatifwedestroyourseas,wemightalsodestroyourselves.Hopefully,itisnottoolate.
51AfeedBattractCsaveDaffect
52AbuyBtreatChaveDuse
53AflowBplaceCpourDthrow
54AbeforeBuntilCafterDfor
55AupBinCawayDover
56ASuchBAllCAnotherDOther
http://www.123zcyy.com/57AchangeBbecomeCmakeDturn
58AmaterialBitemCproductDfood
59AsourceBgiftCthingDmatter
60AcureBcauseCexperienceDcatch
62AcostingBworkingCpayingDdepending
63AgivesBgetsCteachesDpbtains
64AifBwhenCalthoughDbecause
65AReducingBCollectingCRemovingDCasting
因篇幅问题不能全部显示，请点此查看更多更全内容