people used to think that wetlands were wasted land. 阅读理解答案

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1、Peopleusedtothinkthatwetlandswerewastedland.阅读理解答案　　阅读理解Peopleusedtothinkthatwetlandswerewastedland.Developerswoulddrainthemwithditches（水沟），filltheminwithtonsofsoil，andbuildhouses，schools，andparkingareasonthem.Thenscientistsbegantorealizetheimportantrolewetlands

2、playedintheenvironment.　　Wetlandsactlikegiantsponges（海绵）duringstorms.Theysoakupextrastormwaterandafterwardreleaseitslowlybackintothewatercycle.Thishelpspreventflooding.Townswherepeoplehavedrainedwetlandshavefoundthatinabigstorm，theirstreetsandhomesareoftenfloode

3、dbecausetherearenowetlandstosoakuptheexcesswater.　　Wetlandsalsoactasgiantfilterswherepollutantsareabsorbedanddissolvedovertime.Thoughwetlandscanbecomepollutedfromdumping，wastewater，andfertilizerrun-offfromfarmfields，theyareabletoprocesssomepollutantsovertimebeca

4、useofallthemicroorganismsandplantslivingthere.　　Wetlandsareespeciallyimportantforprovidinghomesandbreedingg　　　　roundstomillionsofbirds，fish，andamphibiansworldwide.Manywetlandshavebecomenationalwildliferefuges（避难所），whereyoucangototakepicturesandlookatbirdsandanim

5、als.　　TheEvergladesareahugewetlandthatoncecoveredmorethanfourmillionacresofsouthernFlorida.Sometimescalledthe“riverofgrass”，theEvergladesareashallowsheetofwaterthatslowlyflowedacrossagrassyplain.Inthelate1800speoplebegandrainingpartsoftheEvergladesfordevelopment

6、.Roadswerebuiltandtownssprangup.TheEvergladesshranktohalfitsoriginalsize.CitieslikeMiamigrewupwhereoncetherewasathrivingwetland.Sewageandwastefromthecitieswerepumpedintotheremainingwetlands.OvertimescientistsbegantoseetheimportanceoftheEverglades.Evenwithitssmal

7、lersize，theEvergladesfilteredthepollutantscomingfromthecities，absorbingtheworstofitlikeasewagetreatmentplant.DuringstormstheEvergladesprotectedthecitiesfromstormsurge　　　　flooding.Theyalsoarejustagreatplacetovisitandseewildlife.　　32.Thefirstparagraphisintendedtot

8、ellus________.　　A.wastedlandusedtobewetlands　　B.peopledidn’tknowtheimportanceofwetlandsbefore　　C.wetlandsusedtobeleftundisturbed　　D.wetlandscanbeusedforbuilding　　33.W