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(二) Want a glance of the future of health care Take a look at the way the various networks ...
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Exchangeaglancewithsomeoneandthenlookaway.Doyourea
Icanjustaglanceattherest.
get
look
have
see
________himandthentrytocopywhathedoes.
Mind
Glance at
Stare at
Watch
Exchangeaglancewithsomeoneandthenlookaway.Doyourea
Icaughta______ofthecarbeforeitdisappearedveryrapid
sight
glare
glimpse
glance
Hegaveheran_________admireglancE.
Atfirst______thefamouspaintingdoesn'timpresstheaud
glance
gaze
stare
view
Exchangeaglancewithsomeoneandthenlookaway.Doyourea
Exchangeaglancewithsomeonethenlookaway.Doyourealiz
_____himandthentrytocopywhathedoes.
Mind
Glance at
Stare at
Watch
_____himandthentrytocopywhathedoes.
Mind
Glance at
Stare at
Watch
Itdoesn’tmakeanysenseforusto_______foreignersonpub
stare at; glare at
look at; glance at
observe; glance at
glare at; watch
Agreatcheerwentupfromthecrowdastheycaughtofthehero
vision
view
sight
glance
Exchangeaglancewithsomeoneandthenlookaway.Doyourea
Exchangeaglancewithsomeoneandthenlookaway.Doyourea
Icouldrecognizetheoldcarataglance.
square
feature
flame
glimpse
_______atthegraphandyoucanseeclearlythatthereisagr
One glance
Taking one glance
To take one glance
Taken
Icouldrecognizetheoldcarata{{U}}glance{{/U}}.
square
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get
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At the best
At first glance
At all events
At any rate
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四 Theaveragepersonlearnsmostofthe30000～40000wordswhosemeaningsheorsherecognizesbyhearingthemorgettingfamiliarwiththeminthecontextorsimplyabsorbingthemwithoutconsciouseffort.Thebestwaytobuildagoodvocabularythereforeistoreadagreatdealandtoparticipateinalotofgoodtalks.Therearerelativelyfewwordsthatwelearnpermanentlybypurposefullyreferringtodictionariesorkeepingwordlists.Howevereventhoseextrafewareofvalueandnoonewillmakeamistakebyworkingondevelopingalargervocabulary.Herearesomesuggestionsofhowtodoit. Readplentyofgoodbooks.Whenyoucomeacrossanewwordoranewmeaningofanoldwordstopandseeifyoucanunderstanditfromitscontext.Ifyoucan’tandifyoucanmanagewithoutinterruptingthethoughtofthebooktoomuchlookitupinadictionaryorasksomebodyandthenrepeatitsmeaningtoyourselfacoupleoftimesIfyouarereallyconscientiouswritethewordanditsmeaninginapersonalvocabularylist—preferablyusingitinasentenceoryoucankeepaspecialvocabularynotebook.Gooverthelistfromtimetotime.Furthertrytouseanewwordinwritingorconversationafewtimesoverthenextseveraldays. Listentogoodtalksandbealerttonewwordsyouhearortonewmeaningsofwordsyoualreadyknow.Thentreatthemjustasyoutreatthenewwordsyouread. Learnandbealerttothepartsofwords:prefixessuffixesandroots.Knowingthemenablesyoutomakeintelligentguessesaboutthemeaningofwords. IfyouarestudyingaforeignlanguagebealerttowordsinthatlanguagewhichrelatetowordsinEnglish.Englishhasinheritedorborrowedmuchofitsvocabularyof500000～600000wordsfromLatinGreekFrenchSpanishandGerman. Whenyoumeetanewwordinreadingwhatshouldyoudo
Wehopetogotothebeachtomorrowbutwewon'tgo______it'sraining.
三 Believeitornotopticalillusioncancuthighwaycrashes. Japanisacaseinpoint.Ithasreducedautomobilecrashesonsomeroadsbynearly75percentusingasimpleopticalillusion.Butstripescalledchevronspaintedontheroadsmakedriversthinkthattheyaredrivingfasterthan:theyreallyareandthusdriversslowdown. NowtheAmericanAutomobileAssociationFoundationforTrafficSafetyinWashingtonD.C.isplanningtorepeatJapan’ssuccess.Startingnextyearthefoundationwillpaintchevronsandotherpatternsofstripesonselectedroadsaroundthecountrytotesthowwellthepatternsreducehighwaycrashes. Excessivetoogreatspeedplaysamajorroleinasmuchasonefifthofallfataltrafficaccidentsaccordingtothefoundation.Tohelpreducethoseaccidentsthefoundationwillconductitstestsinareaswherespeed-relatedhazardsdangerarethegreatestcurvesexitslopestrafficcirclesandbridges. Somestudiessuggestthatstraighthorizontalbarspaintedacrossroadscaninitiallycuttheaveragespeedofdriversinhalf.Howevertrafficoftenreturnstofullspeedwithinmonthsasdriversbecomeusedtoseeingthepaintedbars. Chevronsscientistssaynotonlygivedriverstheimpressionthattheyaredrivingfasterthantheyreallyarebutalsomakealaneappeartobenarrower.Theresultisalongerlastingreductioninhighwayspeedandthenumberoftrafficaccidents. Onroadspaintedwithchevronsdriverstendtofeelthat.
一 InOctober1961atCrowleyFieldinCincinnatiOhioanolddeafgentlemannamedWilliamE.HoystooduptothrowthefirsthalloftheWorldSeries.MostpeopleatCrowleyFieldonthatdayprobablydidnotrememberHoybecausehehadretiredfromprofessionalbaseball58yearsearlierin1903.Howeverhehadbeenanoutstandingplayerandthedeafpeoplestilltalkabouthimandhisyearsinbaseball. WilliamE.HoywasborninHouckstownOhioonMay231862.Hebecamedeafwhenhewastwoyearsold.HeattendedtheColumbusOhioSchoolforthedealAftergraduationhestartedplayingbaseballwhileworkingasashoemaker. 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.
Myparentsliveinasmallvillage.Theyalwayskeepcandlesinthehouse______.thereisapowercut.
人具有自我意识发展到一定阶段的人具有规划自己的未来和为未来的发展创造条件的能力由此表明人的身心发展具有
义务教育法规定凡年满周岁儿童不分性别民族种族均为适龄义务教育学生条件不具备的地区儿童的入学年龄可推迟到周岁我国义务教育的年限为年
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious.The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood.Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichCouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 第12空应选择
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious.The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood.Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichCouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 第14空应选择
一 InOctober1961atCrowleyFieldinCincinnatiOhioanolddeafgentlemannamedWilliamE.HoystooduptothrowthefirsthalloftheWorldSeries.MostpeopleatCrowleyFieldonthatdayprobablydidnotrememberHoybecausehehadretiredfromprofessionalbaseball58yearsearlierin1903.Howeverhehadbeenanoutstandingplayerandthedeafpeoplestilltalkabouthimandhisyearsinbaseball. WilliamE.HoywasborninHouckstownOhioonMay231862.Hebecamedeafwhenhewastwoyearsold.HeattendedtheColumbusOhioSchoolforthedealAftergraduationhestartedplayingbaseballwhileworkingasashoemaker. 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
五 AcharacteristicofAmericanculturethathasbecomealmostatraditionistorespecttheself-mademan—themanwhohasrisentothetopthroughhisowneffortsusuallybeginningbyworkingwithhishands.WhiletheleaderinbusinessorindustryorthecollegeprofessoroccupiesahighersocialpositionandcommandsgreaterrespectinthecommunitythanthecommonlaboreroreventheskilledfactoryworkerhemaytakepainstopointoutthathisfatherstartedlifeinAmericaasafarmerorlaborerofsomesort. ThisattitudetowardmanuallaborisnowstillseeninmanyaspectsofAmericanlife.Oneisinvitedtodinneratahomethatisnotonlycomfortablybutevenluxuriouslyfurnishedandinwhichthereiseveryevidenceofthefactthatthefamilyhasbeenabletoaffordforeigntravelexpensivehobbiesandcollegeeducationforthechildren;yetthehostessprobablywillcookthedinnerherselfwillserveitherselfandwillwashdishesafterwardfurthermorethedinnerwillnotconsistmerelyofsomethingquicklyandeasilyassembledfromcontentsofvariouscansandacakeorapieboughtatthenearbybakery.Onthecontrarythehostessusuallytakesprideincarefulpreparationofspecialdishes.Aprofessionalmanmaytalkaboutwashingthecardigginginhisflowerbedspaintingthehouse.Hiswifemayevenhelpwiththesethingsjustasheoftenhelpsherwiththedishwashing.Thesonwhoisawayatcollegemaywaitontableandwashdishesforhislivingorduringthesummerhemayworkwithaconstructiongangonahighwayinordertopayforhiseducation. Fromparagraph1wecanknowthatinAmerica.
二 Somespidershuntonthegroundothersbuildwebstotraptheirfoodbutthegrasswaterspidercatchesitspreybyrunningalongthesurfaceofthewater. Thisspecialwaterspiderlivesonthegrassybanksofstreamswheremosquitoesdamselfliesandotherinsectscometofeedandbreed. AlthoughitisoneofthelargestspidersinNewZealandithasanunusualability.Itdoesn’tdisturbthewaterasitwaitsforitsmealandthere~isbarelyaripplewhenitskimsacrossthesurfaceatlightningspeedtocatchitsprey. Grasswaterspidersdealswiftlywithlargerinsectslikedamselfliesbypullingtheirheadsunderthewaterandholdingthemthereuntiltheydrown. Afteramealthegrasswaterspiderspendsuptohalfanhourgroomingitself.Itwipesitseighteyesbrushesitsantennaeandtakesspecialcaretocleanthehairsonitsbody. Itisthehairsthattraptinybubblesofairsothatthespidercanrundownabladeofgrassandstayunderwaterforuptoanhourwhenitisfrightened.Thehairsalsokeepthespiderdryevenunderwater. Itisonlywhenthefemalespideriscaringfortheyoungthatshedoesnothuntonthewater.Aftermatingsheproducesalargeeggsacwhichshecarriesaroundforfiveweeks.Oncetheeggsstarttohatchsheattachesthesactosomebladesofgrassorathistle.Shethentearsthesacopenandreleasesthetinyspidersintothenurseryweb. Thewriterdescribesthespecialspiderasspecialbecause.
Thosesuccessfuldeafdancersthinkthatdancingisanactivity______sightmattersmorethanhearing.
稍等一会儿我会帮助你的
性善论和性恶论所反映的观点是
三 Believeitornotopticalillusioncancuthighwaycrashes. Japanisacaseinpoint.Ithasreducedautomobilecrashesonsomeroadsbynearly75percentusingasimpleopticalillusion.Butstripescalledchevronspaintedontheroadsmakedriversthinkthattheyaredrivingfasterthan:theyreallyareandthusdriversslowdown. NowtheAmericanAutomobileAssociationFoundationforTrafficSafetyinWashingtonD.C.isplanningtorepeatJapan’ssuccess.Startingnextyearthefoundationwillpaintchevronsandotherpatternsofstripesonselectedroadsaroundthecountrytotesthowwellthepatternsreducehighwaycrashes. Excessivetoogreatspeedplaysamajorroleinasmuchasonefifthofallfataltrafficaccidentsaccordingtothefoundation.Tohelpreducethoseaccidentsthefoundationwillconductitstestsinareaswherespeed-relatedhazardsdangerarethegreatestcurvesexitslopestrafficcirclesandbridges. Somestudiessuggestthatstraighthorizontalbarspaintedacrossroadscaninitiallycuttheaveragespeedofdriversinhalf.Howevertrafficoftenreturnstofullspeedwithinmonthsasdriversbecomeusedtoseeingthepaintedbars. Chevronsscientistssaynotonlygivedriverstheimpressionthattheyaredrivingfasterthantheyreallyarebutalsomakealaneappeartobenarrower.Theresultisalongerlastingreductioninhighwayspeedandthenumberoftrafficaccidents. TheAmericanAutomobileAssociationFoundationforTrafficSafetyplansto.
五 AcharacteristicofAmericanculturethathasbecomealmostatraditionistorespecttheself-mademan—themanwhohasrisentothetopthroughhisowneffortsusuallybeginningbyworkingwithhishands.WhiletheleaderinbusinessorindustryorthecollegeprofessoroccupiesahighersocialpositionandcommandsgreaterrespectinthecommunitythanthecommonlaboreroreventheskilledfactoryworkerhemaytakepainstopointoutthathisfatherstartedlifeinAmericaasafarmerorlaborerofsomesort. ThisattitudetowardmanuallaborisnowstillseeninmanyaspectsofAmericanlife.Oneisinvitedtodinneratahomethatisnotonlycomfortablybutevenluxuriouslyfurnishedandinwhichthereiseveryevidenceofthefactthatthefamilyhasbeenabletoaffordforeigntravelexpensivehobbiesandcollegeeducationforthechildren;yetthehostessprobablywillcookthedinnerherselfwillserveitherselfandwillwashdishesafterwardfurthermorethedinnerwillnotconsistmerelyofsomethingquicklyandeasilyassembledfromcontentsofvariouscansandacakeorapieboughtatthenearbybakery.Onthecontrarythehostessusuallytakesprideincarefulpreparationofspecialdishes.Aprofessionalmanmaytalkaboutwashingthecardigginginhisflowerbedspaintingthehouse.Hiswifemayevenhelpwiththesethingsjustasheoftenhelpsherwiththedishwashing.Thesonwhoisawayatcollegemaywaitontableandwashdishesforhislivingorduringthesummerhemayworkwithaconstructiongangonahighwayinordertopayforhiseducation. Theexpressionwaitontableinthesecondparagraphmeans.
不仅我而且汤姆和玛丽都喜欢游泳
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious.The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood.Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichCouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 第16空应选择
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious.The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood.Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichCouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 第20空应选择
四 Theaveragepersonlearnsmostofthe30000～40000wordswhosemeaningsheorsherecognizesbyhearingthemorgettingfamiliarwiththeminthecontextorsimplyabsorbingthemwithoutconsciouseffort.Thebestwaytobuildagoodvocabularythereforeistoreadagreatdealandtoparticipateinalotofgoodtalks.Therearerelativelyfewwordsthatwelearnpermanentlybypurposefullyreferringtodictionariesorkeepingwordlists.Howevereventhoseextrafewareofvalueandnoonewillmakeamistakebyworkingondevelopingalargervocabulary.Herearesomesuggestionsofhowtodoit. Readplentyofgoodbooks.Whenyoucomeacrossanewwordoranewmeaningofanoldwordstopandseeifyoucanunderstanditfromitscontext.Ifyoucan’tandifyoucanmanagewithoutinterruptingthethoughtofthebooktoomuchlookitupinadictionaryorasksomebodyandthenrepeatitsmeaningtoyourselfacoupleoftimesIfyouarereallyconscientiouswritethewordanditsmeaninginapersonalvocabularylist—preferablyusingitinasentenceoryoucankeepaspecialvocabularynotebook.Gooverthelistfromtimetotime.Furthertrytouseanewwordinwritingorconversationafewtimesoverthenextseveraldays. Listentogoodtalksandbealerttonewwordsyouhearortonewmeaningsofwordsyoualreadyknow.Thentreatthemjustasyoutreatthenewwordsyouread. Learnandbealerttothepartsofwords:prefixessuffixesandroots.Knowingthemenablesyoutomakeintelligentguessesaboutthemeaningofwords. IfyouarestudyingaforeignlanguagebealerttowordsinthatlanguagewhichrelatetowordsinEnglish.Englishhasinheritedorborrowedmuchofitsvocabularyof500000～600000wordsfromLatinGreekFrenchSpanishandGerman. Thephrasebealerttointhethirdparagraphmaybestbereplacedby.
Heisonlytooreadytohelpothersseldom______refusingthemwhentheyturntohim.
—Theweatheristoocold______Marchthisyear.—Itwasstill______whenIcamehereyearsago.
Thechildrenwenthomefromthegrammarschooltheirlessons______fortheday.
关于人的身心发展有哪些典型观点其代表人物是谁基本观点是什么
Itisclearthatsomechemicalscandamagethehealthofanimalsandhumans.1thisisnottheonlyproblemthat2becausedbythecarelessuseofchemicals.Chemicalscanalso3theecologicalbalanceoftheenvironment.Iftheecologicalbalanceisdisturbedtheresultscanbe4serious.The5ofDDTillustratestheproblem.DDTachemicalwhichkillsinsectsatfirstseemedtobeaperfectanswer6manyproblems.Itwouldcontrolinsectsthatcauseddangerousdiseases7insectsthatcausedbillionsofdollarsofdamagetocropseveryyear.Governmentspermittedandeven8theuseofDDT.Farmersinmanycountries9tosprayitontheircrops.The10resultsweregood.Damagetocrops11downandprofitswentup.Howeverthechemicalhadeffectswhichthescientistsdidn’tseein12.Firstitalsokilledinsectswhichwerethe13enemiesoftheharmfulinsectsandwhichwerethereforebeneficialtofarmers.SecondandperhapsworseDDTdidnotkill14harmfulinsect.Afewinsectshadnaturalresistancetothechemical.They15andreproducedinlargenumbers.Inafewyearstherewerelargenumbersofinsectswhichwerenot16byDDTandtherewere17insectswhichCouldactasnatural18onthesenew"super-insects".FinallyitbecameclearthatDDTwasnotsolvingtheinsectproblem.Infactitwasmakingtheproblemworse.It19becamenecessarytofindasecond20fortheeffectsofthefirst. 第18空应选择
决定教育领导权的是
请脱下你的旧上衣穿上这件新的
Takethismedicine______youwillbegettingworse.
二 Somespidershuntonthegroundothersbuildwebstotraptheirfoodbutthegrasswaterspidercatchesitspreybyrunningalongthesurfaceofthewater. Thisspecialwaterspiderlivesonthegrassybanksofstreamswheremosquitoesdamselfliesandotherinsectscometofeedandbreed. AlthoughitisoneofthelargestspidersinNewZealandithasanunusualability.Itdoesn’tdisturbthewaterasitwaitsforitsmealandthere~isbarelyaripplewhenitskimsacrossthesurfaceatlightningspeedtocatchitsprey. Grasswaterspidersdealswiftlywithlargerinsectslikedamselfliesbypullingtheirheadsunderthewaterandholdingthemthereuntiltheydrown. Afteramealthegrasswaterspiderspendsuptohalfanhourgroomingitself.Itwipesitseighteyesbrushesitsantennaeandtakesspecialcaretocleanthehairsonitsbody. Itisthehairsthattraptinybubblesofairsothatthespidercanrundownabladeofgrassandstayunderwaterforuptoanhourwhenitisfrightened.Thehairsalsokeepthespiderdryevenunderwater. Itisonlywhenthefemalespideriscaringfortheyoungthatshedoesnothuntonthewater.Aftermatingsheproducesalargeeggsacwhichshecarriesaroundforfiveweeks.Oncetheeggsstarttohatchsheattachesthesactosomebladesofgrassorathistle.Shethentearsthesacopenandreleasesthetinyspidersintothenurseryweb. Thepurposeofthepassageisto.
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