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孤雁 (唐)杜甫 孤雁不饮啄，飞鸣声念群。 谁怜一片影，相失万重云 望尽似犹见，哀多如更闻。 野鸦无意绪，鸣噪自纷纷。这首诗描写了失群的孤雁叫唤、追赶雁群的形象，其形可悯，其志可嘉。试以第二...
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孤雁杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦无意绪鸣噪自纷纷24.1这首
阅读下面的唐诗然后回答问题孤雁唐杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦
阅读下面的唐诗然后回答问题孤雁唐杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦
阅读下面这首诗然后回答问题6分孤雁杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野
阅读下面的唐诗然后回答问题 孤雁 唐杜甫 孤雁不饮啄飞鸣声念群 谁
孤雁杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦无意绪鸣噪自纷纷【注】此诗是
孤雁唐杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦无意绪鸣噪自纷纷全诗通过孤
阅读下面的唐诗然后回答问题孤雁唐杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦
阅读下面的唐诗然后回答问题孤雁唐杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦
阅读下面的唐诗然后回答问题孤雁唐杜甫孤雁不饮啄飞鸣声念群谁怜一片影相失万重云望尽似犹见哀多如更闻野鸦
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Myparentsliveinasmallvillage.Theyalwayskeepcandlesinthehousethereisapowercut.
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InOctober1961atCrowleyFieldinCincinnatiOhioanolddeafgentlemannamedWilliamE.HoystooduptothrowthefirstballoftheWorldSeries.MostpeopleatCrowleyFieldonthatdayprobablydidnotrememberHoybecausehehadretiredfromprofessionalbaseball58yearsearlierin1903.Howeverhehadbeenanoutstandingplayerandthedeafpeoplestilltalkabouthimandhisyearsinbaseball. WilliamE.HoywasborninHouckstownOhioonMay231862.Hebecamedeafwhenhewastwoyearsold.HeattendedtheColumbusOhioSchoolforthedeaf.Aftergraduationhestartedplayingbaseballwhileworkingasashoemaker. Hoybeganplayingprofessionalbaseballin1886forOshkoshWisconsinoftheNorthwesternLeague.In1888hestartedasanoutfielderwiththeoldWashingtonSenators.Hissmallfigureandspeedmadehimanoutstandingbaserunner.Hewasverygoodatstealingbasesduringhiscareer.Inthe1888majorleagueseasonhestole82bases.HewasalsotheSenators’leadinghitterin1888.Hoywascleverandhethrewright-handedandbattedleft-handed.OnJune191889hethrewoutthreebattersattheplatefromhisoutfieldposition. ThearmsignalsusedbyjudgestodaytoshowballsandstrikesbeganbecauseofHoy.Thejudgeliftedhisrightarmtoshowthatthepitchwasastrikeandhisleftarmtosignalthatitwasaball. FormanyyearspeopletalkedaboutHoy’slastballgamein1903.HewasplayingforLosAngelesofthePacificCoastWinterLeague.ItwasamemorablegamebecauseHoyhitawonderfulballwhichwonthegame.Itwasaveryfoggydayandthereforeveryhardtoseetheball.IntheninthinningwithtwomenoutHoymanagedtocatchaflyballtomakethethirdoutinspiteofthefog.LosAngelesdefeatedtheiroppositionandwonthegame. AfterheretiredHoystayedbusy.HeranadairyfarmnearCincinnatifor20years.Healsobecameapublicspeakerandtraveledgivingspeeches.Untilafewyearsbeforehisdeathhetook4～10milewalksseveralmorningsaweek.OnDecember151961WilliamHoydiedattheageof99. Whatcanbeinferredfromthispassage
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Believeitornotopticalillusioncancuthighwaycrashes. Japanisacaseinpoint.Ithasreducedautomobilecrashesonsomeroadsbynearly75percentusingasimpleopticalillusion.Butstripescalledchevronspaintedontheroadsmakedriversthinkthattheyaredrivingfasterthantheyreallyareandthusdriversslowdown. NowtheAmericanAutomobileAssociationFoundationforTrafficSafetyinWashingtonD.C.isplanningtorepeatJapan’ssuccess.Startingnextyearthefoundationwillpaintchevronsandotherpatternsofstripesonselectedroadsaroundthecountrytotesthowwellthepatternsreducehighwaycrashes. Excessivetoogreatspeedplaysamajorroleinasmuchasonefifthofallfataltrafficaccidentsaccordingtothefoundation.Tohelpreducethoseaccidentsthefoundationwillconductitstestsinareaswherespeed-relatedhazardsdangerarethegreatestcurvesexitslopestrafficcirclesandbridges. Somestudiessuggestthatstraighthorizontalbarspaintedacrossroadscaninitiallycuttheaveragespeedofdriversinhalf.Howevertrafficoftenreturnstofullspeedwithinmonthsasdriversbecomeusedtoseeingthepaintedbars. Chevronsscientistssaynotonlygivedriverstheimpressionthattheyaredrivingfasterthantheyreallyarebutalsomakealaneappeartobenarrower.Theresultisalongerlastingreductioninhighwayspeedandthenumberoftrafficaccidents. TheAmericanAutomobileAssociationFoundationforTrafficSafetyplansto
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Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious. The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood:Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichcouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 14
Somespidershuntonthegroundothersbuildwebstotraptheirfoodbutthegrasswaterspidercatchesitspreybyrunningalongthesurfaceofthewater. Thisspecialwaterspiderlivesonthegrassybanksofstreamswheremosquitoesdamselfliesandotherinsectscometofeedandbreed. AlthoughitisoneofthelargestspidersinNewZealandithasanunusualability.Itdoesn’tdisturbthewaterasitwaitsforitsmealandthereisbarelyaripplewhenitskimsacrossthesurfaceatlightningspeedtocatchitsprey. Grasswaterspidersdealswiftlywithlargerinsectslikedamselfliesbypullingtheirheadsunderthewaterandholdingthemthereuntiltheydrown. Afteramealthegrasswaterspiderspendsuptohalfanhourgroomingitself.Itwipesitseighteyesbrushesitsantennaeandtakesspecialcaretocleanthehairsonitsbody. Itisthehairsthattraptinybubblesofairsothatthespidercanrundownabladeofgrassandstayunderwaterforuptoanhourwhenitisfrightened.Thehairsalsokeepthespiderdryevenunderwater. Itisonlywhenthefemalespideriscaringfortheyoungthatshedoesnothuntonthewater.Aftermatingsheproducesalargeeggsacwhichshecarriesaroundforfiveweeks.Oncetheeggsstarttohatchsheattachesthesactosomebladesofgrassorathistle.Shethentearsthesacopenandreleasesthetinyspidersintothenurseryweb. Thewriterdescribesthespecialspiderasspecialbecause
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AcharacteristicofAmericanculturethathasbecomealmostatraditionistorespecttheself-mademan—themanwhohasrisentothetopthroughhisowneffortsusuallybeginningbyworkingwithhishands.WhiletheleaderinbusinessorindustryorthecollegeprofessoroccupiesahighersocialpositionandcommandsgreaterrespectinthecommunitythanthecommonlaboreroreventheskilledfactoryworkerhemaytakepainstopointoutthathisfatherstartedlifeinAmericaasafarmerorlaborerofsomesort. ThisattitudetowardmanuallaborisnowstillseeninmanyaspectsofAmericanlife.Oneisinvitedtodinneratahomethatisnotonlycomfortablybutevenluxuriouslyfurnishedandinwhichthereiseveryevidenceofthefactthatthefamilyhasbeenabletoaffordforeigntravelexpensivehobbiesandcollegeeducationforthechildren;yetthehostessprobablywillcookthedinnerherselfwillserveitherselfandwillwashdishesafterwardfurthermorethedinnerwillnotconsistmerelyofsomethingquicklyandeasilyassembledfromcontentsofvariouscansandacakeorapieboughtatthenearbybakery.Onthecontrarythehostessusuallytakesprideincarefulpreparationofspecialdishes.Aprofessionalmanmaytalkaboutwashingthecardigginginhisflowerbedspaintingthehouse.Hiswifemayevenhelpwiththesethingsjustasheoftenhelpsherwiththedishwashing.Thesonwhoisawayatcollegemaywaitontableandwashdishesforhislivingorduringthesummerhemayworkwithaconstructiongangonahighwayinordertopayforhiseducation. Fromparagraph1wecanknowthatinAmerica
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Believeitornotopticalillusioncancuthighwaycrashes. Japanisacaseinpoint.Ithasreducedautomobilecrashesonsomeroadsbynearly75percentusingasimpleopticalillusion.Butstripescalledchevronspaintedontheroadsmakedriversthinkthattheyaredrivingfasterthantheyreallyareandthusdriversslowdown. NowtheAmericanAutomobileAssociationFoundationforTrafficSafetyinWashingtonD.C.isplanningtorepeatJapan’ssuccess.Startingnextyearthefoundationwillpaintchevronsandotherpatternsofstripesonselectedroadsaroundthecountrytotesthowwellthepatternsreducehighwaycrashes. Excessivetoogreatspeedplaysamajorroleinasmuchasonefifthofallfataltrafficaccidentsaccordingtothefoundation.Tohelpreducethoseaccidentsthefoundationwillconductitstestsinareaswherespeed-relatedhazardsdangerarethegreatestcurvesexitslopestrafficcirclesandbridges. Somestudiessuggestthatstraighthorizontalbarspaintedacrossroadscaninitiallycuttheaveragespeedofdriversinhalf.Howevertrafficoftenreturnstofullspeedwithinmonthsasdriversbecomeusedtoseeingthepaintedbars. Chevronsscientistssaynotonlygivedriverstheimpressionthattheyaredrivingfasterthantheyreallyarebutalsomakealaneappeartobenarrower.Theresultisalongerlastingreductioninhighwayspeedandthenumberoftrafficaccidents. Onroadspaintedwithchevronsdriverstendtofeelthat
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Theaveragepersonlearnsmostofthe30000～40000wordswhosemeaningsheorsherecognizesbyhearingthemorgettingfamiliarwiththeminthecontextorsimplyabsorbingthemwithoutconsciouseffort.Thebestwaytobuildagoodvocabularythereforeistoreadagreatdealandtoparticipateinalotofgoodtalks.Therearerelativelyfewwordsthatwelearnpermanentlybypurposefullyreferringtodictionariesorkeepingwordlists.Howevereventhoseextrafewareofvalueandnoonewillmakeamistakebyworkingondevelopingalargervocabulary.Herearesomesuggestionsofhowtodoit. Readplentyofgoodbooks.Whenyoucomeacrossanewwordoranewmeaningofanoldwordstopandseeifyoucanunderstanditfromitscontext.Ifyoucan’tandifyoucanmanagewithoutinterruptingthethoughtofthebooktoomuchlookitupinadictionaryorasksomebodyandthenrepeatitsmeaningtoyourselfacoupleoftimes.Ifyouarereallyconscientiouswritethewordanditsmeaninginapersonalvocabularylist—preferablyusingitinasentenceoryoucankeepaspecialvocabularynotebook.Gooverthelistfromtimetotime.Furthertrytouseanewwordinwritingorconversationafewtimesoverthenextseveraldays. Listentogoodtalksandbealerttonewwordsyouhearortonewmeaningsofwordsyoualreadyknow.Thentreatthemjustasyoutreatthenewwordsyouread. Learnandbealerttothepartsofwords:prefixessuffixesandroots.Knowingthemenablesyoutomakeintelligentguessesaboutthemeaningofwords. IfyouarestudyingaforeignlanguagebealerttowordsinthatlanguagewhichrelatetowordsinEnglish.Englishhasinheritedorborrowedmuchofitsvocabularyof500000～600000wordsfromLatinGreekFrenchSpanishandGerman. Whenyoumeetanewwordinreadingwhatshouldyoudo
Wehopetogotothebeachtomorrowbutwewon'tgoit'sraining.
Somespidershuntonthegroundothersbuildwebstotraptheirfoodbutthegrasswaterspidercatchesitspreybyrunningalongthesurfaceofthewater. Thisspecialwaterspiderlivesonthegrassybanksofstreamswheremosquitoesdamselfliesandotherinsectscometofeedandbreed. AlthoughitisoneofthelargestspidersinNewZealandithasanunusualability.Itdoesn’tdisturbthewaterasitwaitsforitsmealandthereisbarelyaripplewhenitskimsacrossthesurfaceatlightningspeedtocatchitsprey. Grasswaterspidersdealswiftlywithlargerinsectslikedamselfliesbypullingtheirheadsunderthewaterandholdingthemthereuntiltheydrown. Afteramealthegrasswaterspiderspendsuptohalfanhourgroomingitself.Itwipesitseighteyesbrushesitsantennaeandtakesspecialcaretocleanthehairsonitsbody. Itisthehairsthattraptinybubblesofairsothatthespidercanrundownabladeofgrassandstayunderwaterforuptoanhourwhenitisfrightened.Thehairsalsokeepthespiderdryevenunderwater. Itisonlywhenthefemalespideriscaringfortheyoungthatshedoesnothuntonthewater.Aftermatingsheproducesalargeeggsacwhichshecarriesaroundforfiveweeks.Oncetheeggsstarttohatchsheattachesthesactosomebladesofgrassorathistle.Shethentearsthesacopenandreleasesthetinyspidersintothenurseryweb. Thepurposeofthepassageisto
Theaveragepersonlearnsmostofthe30000～40000wordswhosemeaningsheorsherecognizesbyhearingthemorgettingfamiliarwiththeminthecontextorsimplyabsorbingthemwithoutconsciouseffort.Thebestwaytobuildagoodvocabularythereforeistoreadagreatdealandtoparticipateinalotofgoodtalks.Therearerelativelyfewwordsthatwelearnpermanentlybypurposefullyreferringtodictionariesorkeepingwordlists.Howevereventhoseextrafewareofvalueandnoonewillmakeamistakebyworkingondevelopingalargervocabulary.Herearesomesuggestionsofhowtodoit. Readplentyofgoodbooks.Whenyoucomeacrossanewwordoranewmeaningofanoldwordstopandseeifyoucanunderstanditfromitscontext.Ifyoucan’tandifyoucanmanagewithoutinterruptingthethoughtofthebooktoomuchlookitupinadictionaryorasksomebodyandthenrepeatitsmeaningtoyourselfacoupleoftimes.Ifyouarereallyconscientiouswritethewordanditsmeaninginapersonalvocabularylist—preferablyusingitinasentenceoryoucankeepaspecialvocabularynotebook.Gooverthelistfromtimetotime.Furthertrytouseanewwordinwritingorconversationafewtimesoverthenextseveraldays. Listentogoodtalksandbealerttonewwordsyouhearortonewmeaningsofwordsyoualreadyknow.Thentreatthemjustasyoutreatthenewwordsyouread. Learnandbealerttothepartsofwords:prefixessuffixesandroots.Knowingthemenablesyoutomakeintelligentguessesaboutthemeaningofwords. IfyouarestudyingaforeignlanguagebealerttowordsinthatlanguagewhichrelatetowordsinEnglish.Englishhasinheritedorborrowedmuchofitsvocabularyof500000～600000wordsfromLatinGreekFrenchSpanishandGerman. Thephrasebealerttointhethirdparagraphmaybestbereplacedby.
AcharacteristicofAmericanculturethathasbecomealmostatraditionistorespecttheself-mademan—themanwhohasrisentothetopthroughhisowneffortsusuallybeginningbyworkingwithhishands.WhiletheleaderinbusinessorindustryorthecollegeprofessoroccupiesahighersocialpositionandcommandsgreaterrespectinthecommunitythanthecommonlaboreroreventheskilledfactoryworkerhemaytakepainstopointoutthathisfatherstartedlifeinAmericaasafarmerorlaborerofsomesort. ThisattitudetowardmanuallaborisnowstillseeninmanyaspectsofAmericanlife.Oneisinvitedtodinneratahomethatisnotonlycomfortablybutevenluxuriouslyfurnishedandinwhichthereiseveryevidenceofthefactthatthefamilyhasbeenabletoaffordforeigntravelexpensivehobbiesandcollegeeducationforthechildren;yetthehostessprobablywillcookthedinnerherselfwillserveitherselfandwillwashdishesafterwardfurthermorethedinnerwillnotconsistmerelyofsomethingquicklyandeasilyassembledfromcontentsofvariouscansandacakeorapieboughtatthenearbybakery.Onthecontrarythehostessusuallytakesprideincarefulpreparationofspecialdishes.Aprofessionalmanmaytalkaboutwashingthecardigginginhisflowerbedspaintingthehouse.Hiswifemayevenhelpwiththesethingsjustasheoftenhelpsherwiththedishwashing.Thesonwhoisawayatcollegemaywaitontableandwashdishesforhislivingorduringthesummerhemayworkwithaconstructiongangonahighwayinordertopayforhiseducation. Theexpressionwaitontableinthesecondparagraphmeans.
Georgecouldn'trememberwhenhefirstmetMr.AndersonbuthewassureitwasSundaybecauseeverybodywasatchurch.
InOctober1961atCrowleyFieldinCincinnatiOhioanolddeafgentlemannamedWilliamE.HoystooduptothrowthefirstballoftheWorldSeries.MostpeopleatCrowleyFieldonthatdayprobablydidnotrememberHoybecausehehadretiredfromprofessionalbaseball58yearsearlierin1903.Howeverhehadbeenanoutstandingplayerandthedeafpeoplestilltalkabouthimandhisyearsinbaseball. WilliamE.HoywasborninHouckstownOhioonMay231862.Hebecamedeafwhenhewastwoyearsold.HeattendedtheColumbusOhioSchoolforthedeaf.Aftergraduationhestartedplayingbaseballwhileworkingasashoemaker. Hoybeganplayingprofessionalbaseballin1886forOshkoshWisconsinoftheNorthwesternLeague.In1888hestartedasanoutfielderwiththeoldWashingtonSenators.Hissmallfigureandspeedmadehimanoutstandingbaserunner.Hewasverygoodatstealingbasesduringhiscareer.Inthe1888majorleagueseasonhestole82bases.HewasalsotheSenators’leadinghitterin1888.Hoywascleverandhethrewright-handedandbattedleft-handed.OnJune191889hethrewoutthreebattersattheplatefromhisoutfieldposition. ThearmsignalsusedbyjudgestodaytoshowballsandstrikesbeganbecauseofHoy.Thejudgeliftedhisrightarmtoshowthatthepitchwasastrikeandhisleftarmtosignalthatitwasaball. FormanyyearspeopletalkedaboutHoy’slastballgamein1903.HewasplayingforLosAngelesofthePacificCoastWinterLeague.ItwasamemorablegamebecauseHoyhitawonderfulballwhichwonthegame.Itwasaveryfoggydayandthereforeveryhardtoseetheball.IntheninthinningwithtwomenoutHoymanagedtocatchaflyballtomakethethirdoutinspiteofthefog.LosAngelesdefeatedtheiroppositionandwonthegame. AfterheretiredHoystayedbusy.HeranadairyfarmnearCincinnatifor20years.Healsobecameapublicspeakerandtraveledgivingspeeches.Untilafewyearsbeforehisdeathhetook4～10milewalksseveralmorningsaweek.OnDecember151961WilliamHoydiedattheageof99. WecaninferfromthelastparagraphthatHoyinhislateyears.
Theseasideheredrawsalotoftouristseverysummer.Warmsunshineandsoftsandsmakeitis.
Iwasasingleparentoffoursmallchildrenworkingatalowpaidjob.Moneywasalwaystightbutwehada1overourheadsfoodonthetableclothesonourbacksandifnotalotalways2.NotknowingwewerepoormykidsjustthoughtIwas3.I’vealwaysbeengladaboutthat. ItwasChristmastimeandalthoughtherewasn’t4foralotofgiftsweplannedtocelebratewithafamilyparty.Butthebig5forthekidswasthefunofChristmas6. Theyplannedweeksaheadoftimeasking7whattheywantedforChristmas.FortunatelyIhadsavedMYM120for8tosharebyallfiveofus. Thebig9arrived.Igaveeachkidatwenty-dollarbilland10themtolookforgiftsofaboutfourdollarseach.Theneveryonescattered.Wehadtwohourstoshop;thenwewould11backatthe"Santa’sWorkshop". DrivinghomeeveryonewasinhighChristmasspirits12myyoungerdaughterGingerwhowasunusually13.Shehadonlyonesmallflatbagwithafewcandies—fiftycentcandies!IwassoangrybutIdidn’tsayanything14wegothome.Icalledherintomybedroomandclosedthedoor15tobeangryagain.Thisiswhatshetoldme. "Iwaslooking16thinkingofwhattobuyandI17toreadthelittlecardsonthe’GivingTrees’.Onewasforalittlegirlfouryearsoldandallshe18forChristmaswasadoll.SoItookthecardoffthetreeand19thedollforher.Wehavesomuchandshedoesn’thaveanything." Ineverfeltso20asIdidthatday. 2
教学目标包括情感目标知识目标和______
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious. The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood:Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichcouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 18
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious. The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood:Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichcouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 16
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious. The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood:Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichcouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 20
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