【下面是一篇杂志文章，请将标有A—F的段落插入文章中标号为1—5的合适位置，使这篇文章意义完整，结构连贯；其中有一个段落是多余的。Everyyearmoreandmoreplantsandanimalsdisappearneverto】

　　下面是一篇杂志文章，请将标有A—F的段落插入文章中标号为1—5的合适位置，使这篇文章意义完整，结构连贯；其中有一个段落是多余的。

　　Everyyearmoreandmoreplantsandanimalsdisappearnevertobeseenagain.

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　　Everydaythousandsofspeciesofanimalsdrawclosertoextinction.Therearecountlessnumbersofspecieswhichmaybecomeextinctbeforetheyareevendiscovered.

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　　Theproblemisacidrain.Acidrain.Acidrainisakindofairpollution.

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　　Theraininmanyplacesisn’tnaturalandcleananymore.It’sfullofacidchemicals.    4   

　　Butdeadfishmaybejustthebeginningoftheproblem.Scientistsarefindingothereffectsofacidrain.

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　　Nowscientistsarealsobeginningtostudytheeffectsofacidrainonlargeranimals.ForexampletheybelievethatsomedeerinPolandarelesshealthybecauseofacidrain.Ifdeerarehurtbytherainwhataboutpeople?Thisisthequestionmanypeoplearebeginningtoask.Nooneknowstheansweryet.Butitisanimportantquestionforusall.

　　A．Seldomdoesitrainandthereislittlefreshwaterhereforthefish.Aseriesofdevelopmentprojectshasdestroyedthenaturalenvironment.Wasteofdifferentkindscanbeseenhereandthere.Thishascausedseriousproblemforfishandotheranimalslivingaround.

　　B．Insomelargeareastreesaredying.Notjustonetreehereandtherebutwholeforests.Atfirstscientistscoundn’tunderstandwhy.Therewerenobugs（虫）ordiseasesinthesetrees.Theweatherwasnotdry.Butnowtheythinkthattherainwasthecause.Acidrainismakingtheearthmoreacidicintheseareas.Somekindsoftreescannotliveinthesoilthatisveryacidic.

　　C．Whenitfallsinlakesitchangesthemtoo.Thelakesbecomemoreacidic.Acidwaterislikevinegarorlemonjuice.Ithurtswhenitgetsinyoureyes.Italsokillstheplantsandanimalsthatusuallyliveinlakewater.Thatiswhythefisharedyinginlakes.

　　D．Itiscausedbyfactoriesthatburncoaloroilorgas.Thesefactoriessendsmokehighintotheair.Thewindoftencarriesthesmokefarfromthefactories. Someoftheharmfulsubstancesinthesmokemaycomedownwiththerainhundredsofmilesaway.

　　E．Strangelyitisthemostintelligentbutmostthoughtlessanimalthatiscausingmos