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函数f（x）=2cos2x+sin2x的最小值是（）.
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函数fx=2cos2x+sin2x的最小值是．
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已知函数fx=sinx+cosx2+cos2x.1求函数fx的最小正周期2求函数fx在区间上的最大值
已知函数fx=x•cos2x则fx的导函数f′x=
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cos2x﹣xsin2x
cos2x+2xsin2x
cos2x+xsin2x
函数fx＝2cos2x＋sin2x的最小值是________.
设函数fx=2sinxcos2+cosxsinφ-sinx0
下列函数中为偶函数且有最小值的是
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已知函数fx＝sinx＋cosx2＋2cos2x－2.1求fx的单调递增区间2当x∈时求函数fx的最
已知函数fx＝sinx＋cosx2＋cos2x.1求fx的最小正周期2求fx在区间上的最大值和最小值
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—Wouldyouliketeaorcoffee—______isOK.Ireallydon'tmind.
WhenDavewaseighteenheboughtasecondhandcarfor200sothathecouldtraveltoandfromworkmore1thanbybus.Itworkedquitewellforafewyearsbutthenitgotsooldanditwascostinghim2muchinrepairsthathedecidedthathehadbetter3it. Heaskedamonghisfriendstoseeifanyonewasparticularly4tobuyacheapcarbuttheyallknewthatitwasfallingtopiecesso5ofthemhadanydesiretobuyit.Dave’sfriendSamsawthathewas6whentheymetoneeveningandsaid"What’s7Dave" DavetoldhimandSamanswered"WellwhataboutadvertisingitinthepaperYoumay8moreforitthatwaythanthecostoftheadvertisement!"ThinkingthatSam’s9wassensibleheputanadvertisementinaneveningpaperwhichread"Forsale:smallcar10verylittlepetrolonlytwoowners.Bargainat50."Fortwodaysaftertheadvertisementfirstappearedtherewasno11.ButthenonSaturdayeveninghehadanenquiry.Amanrangupandsaidhewouldliketo12himaboutthecar."Allright"Davesaidfeelinghappy.Heaskedthemanwhetherteno’clockthenextmorningwouldbe13ornot."Fine"themansaid"andI’ll14mywife.Weintendtogoforarideinitto15it." ThenextmorningataquartertotenDaveparkedthecarinthesquareoutsidehisfrontdoor16towaitthereforthepeoplewhohad17hisadvertisement.EvenDavehadto18thatthecarreallylookedlikeawreck.Thensoonafterhehadgotthecarasclean19itcouldbeapolicecarstoppedjustbehindhimandapolicemangotout.HelookedatDave’scarandthensaid"Haveyoureportedthis20tousyetsir/ 10.
It’snoteasytobeanastronaut’sson.Everybodyexpectsyoutobespecialorperfect.Ioftenwonderhowmyfathereverhadasonlikeme.Imeanhe’ssospecialandsogoodateverythinghedoes.Eveninmiddleschoolhewasclasspresidentandcaptainofthefootballteam.WelltobehonestIoftendreamaboutbeingsomekindofheroordoingsomethingspecial-likesavingachildfromaburningbuildingordiscoveringanewstar.IwasdaydreamingatschoolonemorningwhenmyteachersaidtherewouldbeaFather’sDaywritingcompetitionforthewholeschool.Ihopewehaveawinnerrighthereinmyclass.WhenIgothomeIstartedtothinkaboutwhattowrite.Myfatherisanastronaut.NoIwouldn’tstartlikethat.Thatwasthewayotherssawhim.HowdidIseemyfatherHmm.IsawhimsittingwithmeinthedarkwhenIhadaterribledream.IrememberedhowhehuggedmeforhourswhenmydogSpottywaskilledbyacar.YesthesewerethethingsIwasgoingtowrite.Tomehewasn’tjustaworld-famousastronaut.Hewasmydad.MyparentsandIwenttoschoolThursdaynight.Thereweresomanypeopleinthebighall!MydadlookedatmeandIshrugged耸肩.Thethirdprizewasannouncedanditwasnotme.Iwasrelieved释然anddisappointedatthesametime.Thesecondprizewasannounced.Itwasme.IwentuptothestageandreadwhatIhadwrittenMyFather’sSon.WhenIfinishedthepeoplestoodupandcheered.Isawmyfatherblowinghisnose.Tearswererunningdownmymother’sface.Dadclearedhisthroatandputhishandonmyshoulder.Sonthisistheproudestmomentofmylife.Itwastheproudestmomentofmylifetoo.MaybeI’llneverbeagreatheroorwinaNobelPrizebutitwasenoughjusttobemyfather’sson.Whatisthebesttitleofthepassage______
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IndustrialpollutionisnotonlyaproblemforthecountriesofEuropeandNorthAmericabutalsoanextremelyseriousprobleminsomedevelopingcountries.Forthesecountrieseconomicgrowthisaveryimportantaim.Theywanttointroduceindustriesandsotheyputfewcontrolsontheindustrieswhichcausepollution.Cubataoanindustrialtownof85000peopleinBrazilisanexampleoftheconnectionbetweenindustrialdevelopmentandpollution.In1954Cubataohadnoindustry.Todayithasmorethantwentylargefactorieswhichproducemanypollutants.Thepeopleofthetownaresufferingfromthepoisonousmatterintheirenvironmentandthebadeffectscanbeclearlyseen.Birthshortcomingsareextremelycommon.AmongchildrenandadultslungproblemsaresometimestwelvetimesmorecommoninCubataothaninotherplaces.ItistruethatBrazillikemanyothercountrieshaslawsagainstpollutionbuttheselawsarenotenforcedstrictlyenough.Itischeaperforcompaniestotakenonoticeofthelawsandpaythefinesthantobuytheexpensiveequipmentthatwillreducethepollution.Itisclearthereforethateconomicgrowthismoreimportanttothegovernmentthantothehealthoftheworkers.HowevertheresponsibilitydoesnotcompletelyliewiththeBraziliangovernment.TheexampleofCubataoshowsthatinternationalcompaniesarenotactinginaresponsiblewayeither.AnumberofthefactoriesinthetownareownedbylargecompaniesfromFranceItalyandtheUS.TheyaredoingthingsinBrazilthattheywouldnotbeabletodoathome.Iftheycausedthesameamountofpollutionathometheywouldbeseverelypunishedorevenputoutofbusiness.HowisthehealthofthepopulationofCubatao
Somepeopleholdthatthemoreconservativetheworldbecomes______haveoldfurnitureoldhousesandoldpaintings.
IndustrialpollutionisnotonlyaproblemforthecountriesofEuropeandNorthAmericabutalsoanextremelyseriousprobleminsomedevelopingcountries.Forthesecountrieseconomicgrowthisaveryimportantaim.Theywanttointroduceindustriesandsotheyputfewcontrolsontheindustrieswhichcausepollution.Cubataoanindustrialtownof85000peopleinBrazilisanexampleoftheconnectionbetweenindustrialdevelopmentandpollution.In1954Cubataohadnoindustry.Todayithasmorethantwentylargefactorieswhichproducemanypollutants.Thepeopleofthetownaresufferingfromthepoisonousmatterintheirenvironmentandthebadeffectscanbeclearlyseen.Birthshortcomingsareextremelycommon.AmongchildrenandadultslungproblemsaresometimestwelvetimesmorecommoninCubataothaninotherplaces.ItistruethatBrazillikemanyothercountrieshaslawsagainstpollutionbuttheselawsarenotenforcedstrictlyenough.Itischeaperforcompaniestotakenonoticeofthelawsandpaythefinesthantobuytheexpensiveequipmentthatwillreducethepollution.Itisclearthereforethateconomicgrowthismoreimportanttothegovernmentthantothehealthoftheworkers.HowevertheresponsibilitydoesnotcompletelyliewiththeBraziliangovernment.TheexampleofCubataoshowsthatinternationalcompaniesarenotactinginaresponsiblewayeither.AnumberofthefactoriesinthetownareownedbylargecompaniesfromFranceItalyandtheUS.TheyaredoingthingsinBrazilthattheywouldnotbeabletodoathome.Iftheycausedthesameamountofpollutionathometheywouldbeseverelypunishedorevenputoutofbusiness.Whydon’tdevelopingcountrieshavestrictpollutioncontrols
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WhenDavewaseighteenheboughtasecondhandcarfor200sothathecouldtraveltoandfromworkmore1thanbybus.Itworkedquitewellforafewyearsbutthenitgotsooldanditwascostinghim2muchinrepairsthathedecidedthathehadbetter3it. Heaskedamonghisfriendstoseeifanyonewasparticularly4tobuyacheapcarbuttheyallknewthatitwasfallingtopiecesso5ofthemhadanydesiretobuyit.Dave’sfriendSamsawthathewas6whentheymetoneeveningandsaid"What’s7Dave" DavetoldhimandSamanswered"WellwhataboutadvertisingitinthepaperYoumay8moreforitthatwaythanthecostoftheadvertisement!"ThinkingthatSam’s9wassensibleheputanadvertisementinaneveningpaperwhichread"Forsale:smallcar10verylittlepetrolonlytwoowners.Bargainat50."Fortwodaysaftertheadvertisementfirstappearedtherewasno11.ButthenonSaturdayeveninghehadanenquiry.Amanrangupandsaidhewouldliketo12himaboutthecar."Allright"Davesaidfeelinghappy.Heaskedthemanwhetherteno’clockthenextmorningwouldbe13ornot."Fine"themansaid"andI’ll14mywife.Weintendtogoforarideinitto15it." ThenextmorningataquartertotenDaveparkedthecarinthesquareoutsidehisfrontdoor16towaitthereforthepeoplewhohad17hisadvertisement.EvenDavehadto18thatthecarreallylookedlikeawreck.Thensoonafterhehadgotthecarasclean19itcouldbeapolicecarstoppedjustbehindhimandapolicemangotout.HelookedatDave’scarandthensaid"Haveyoureportedthis20tousyetsir/ 6.
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Solongasteachersfailtodistinguishdifferbetweenteachingandlearningtheywillcontinuetoundertaketodoforchildrenthatwhichonlychildrencandoforthemselves.Teachingchildrentoreadisnotpassingreadingontothem.Itiscertainlynotendlesshoursspentinactivitiesaboutreading.Douglasinsiststhat"readingcannotbetaughtdirectlyandschoolsshouldstoptryingtodotheimpossible". Teachingandlearningaretwoentirelydifferentprocesses.Theydifferinkindandfunction.Thefunctionofteachingistocreatetheconditionsandtheclimatethatwillmakeitpossibleforchildrentoplancleverlythemostefficientsystemforteachingthemselvestoread.Teachingisalsoapublicactivity.Itcanbeseenandobserved. Learningtoreadinvolvesallthateachindividualdoestounderstandtheworldofprintedlanguage.Almostallofitisprivateforlearningisanoccupationofthemindandthatprocessisnotopentopublicscrutiny. IfteacherandlearnerrolesarenotinterchangeablewhatthencanbedonethroughteachingthatwillaidthechildinthelongsearchforknowledgeSmithhasoneprincipleruleforallteachinginstructions."Makelearningtoreadeasywhichmeansmakingreadingameaningfulenjoyableandfrequentexperienceforchildren." Whentherolesofteacherandlearnerareseenforwhattheyareandwhenbothteacherandlearnerfulfillthemproperlythenmuchofthepressureandfeelingoffailureforbothisgotridof.Learningtoreadismadeeasierwhenteacherscreateanenvironmentwherechildrenaregiventhechancetosolvetheproblemoflearningtoreadbylearning. Theproblemwiththereadingcourseasmentionedinthefirstparagraphisthat.
WhenDavewaseighteenheboughtasecondhandcarfor200sothathecouldtraveltoandfromworkmore1thanbybus.Itworkedquitewellforafewyearsbutthenitgotsooldanditwascostinghim2muchinrepairsthathedecidedthathehadbetter3it. Heaskedamonghisfriendstoseeifanyonewasparticularly4tobuyacheapcarbuttheyallknewthatitwasfallingtopiecesso5ofthemhadanydesiretobuyit.Dave’sfriendSamsawthathewas6whentheymetoneeveningandsaid"What’s7Dave" DavetoldhimandSamanswered"WellwhataboutadvertisingitinthepaperYoumay8moreforitthatwaythanthecostoftheadvertisement!"ThinkingthatSam’s9wassensibleheputanadvertisementinaneveningpaperwhichread"Forsale:smallcar10verylittlepetrolonlytwoowners.Bargainat50."Fortwodaysaftertheadvertisementfirstappearedtherewasno11.ButthenonSaturdayeveninghehadanenquiry.Amanrangupandsaidhewouldliketo12himaboutthecar."Allright"Davesaidfeelinghappy.Heaskedthemanwhetherteno’clockthenextmorningwouldbe13ornot."Fine"themansaid"andI’ll14mywife.Weintendtogoforarideinitto15it." ThenextmorningataquartertotenDaveparkedthecarinthesquareoutsidehisfrontdoor16towaitthereforthepeoplewhohad17hisadvertisement.EvenDavehadto18thatthecarreallylookedlikeawreck.Thensoonafterhehadgotthecarasclean19itcouldbeapolicecarstoppedjustbehindhimandapolicemangotout.HelookedatDave’scarandthensaid"Haveyoureportedthis20tousyetsir/ 12.
素质教育对学生的要求是______
WhenDavewaseighteenheboughtasecondhandcarfor200sothathecouldtraveltoandfromworkmore1thanbybus.Itworkedquitewellforafewyearsbutthenitgotsooldanditwascostinghim2muchinrepairsthathedecidedthathehadbetter3it. Heaskedamonghisfriendstoseeifanyonewasparticularly4tobuyacheapcarbuttheyallknewthatitwasfallingtopiecesso5ofthemhadanydesiretobuyit.Dave’sfriendSamsawthathewas6whentheymetoneeveningandsaid"What’s7Dave" DavetoldhimandSamanswered"WellwhataboutadvertisingitinthepaperYoumay8moreforitthatwaythanthecostoftheadvertisement!"ThinkingthatSam’s9wassensibleheputanadvertisementinaneveningpaperwhichread"Forsale:smallcar10verylittlepetrolonlytwoowners.Bargainat50."Fortwodaysaftertheadvertisementfirstappearedtherewasno11.ButthenonSaturdayeveninghehadanenquiry.Amanrangupandsaidhewouldliketo12himaboutthecar."Allright"Davesaidfeelinghappy.Heaskedthemanwhetherteno’clockthenextmorningwouldbe13ornot."Fine"themansaid"andI’ll14mywife.Weintendtogoforarideinitto15it." ThenextmorningataquartertotenDaveparkedthecarinthesquareoutsidehisfrontdoor16towaitthereforthepeoplewhohad17hisadvertisement.EvenDavehadto18thatthecarreallylookedlikeawreck.Thensoonafterhehadgotthecarasclean19itcouldbeapolicecarstoppedjustbehindhimandapolicemangotout.HelookedatDave’scarandthensaid"Haveyoureportedthis20tousyetsir/ 4.
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WhenDavewaseighteenheboughtasecondhandcarfor200sothathecouldtraveltoandfromworkmore1thanbybus.Itworkedquitewellforafewyearsbutthenitgotsooldanditwascostinghim2muchinrepairsthathedecidedthathehadbetter3it. Heaskedamonghisfriendstoseeifanyonewasparticularly4tobuyacheapcarbuttheyallknewthatitwasfallingtopiecesso5ofthemhadanydesiretobuyit.Dave’sfriendSamsawthathewas6whentheymetoneeveningandsaid"What’s7Dave" DavetoldhimandSamanswered"WellwhataboutadvertisingitinthepaperYoumay8moreforitthatwaythanthecostoftheadvertisement!"ThinkingthatSam’s9wassensibleheputanadvertisementinaneveningpaperwhichread"Forsale:smallcar10verylittlepetrolonlytwoowners.Bargainat50."Fortwodaysaftertheadvertisementfirstappearedtherewasno11.ButthenonSaturdayeveninghehadanenquiry.Amanrangupandsaidhewouldliketo12himaboutthecar."Allright"Davesaidfeelinghappy.Heaskedthemanwhetherteno’clockthenextmorningwouldbe13ornot."Fine"themansaid"andI’ll14mywife.Weintendtogoforarideinitto15it." ThenextmorningataquartertotenDaveparkedthecarinthesquareoutsidehisfrontdoor16towaitthereforthepeoplewhohad17hisadvertisement.EvenDavehadto18thatthecarreallylookedlikeawreck.Thensoonafterhehadgotthecarasclean19itcouldbeapolicecarstoppedjustbehindhimandapolicemangotout.HelookedatDave’scarandthensaid"Haveyoureportedthis20tousyetsir/ 2.
学生们每天问那位老师很多问题
HowtoprotectchildrenWebfansfromunsuitablematerialon-linewhileencouragingthemtousetheInternethaslongbeendiscussedintheUS.ForsomeparentstheInternetcanseemlikeajunglefilledwithdangerfortheirchildren.ButjunglescontainwondersaswellasdangersandwithgoodguidessomeeducationandafewprecautionsthewildsoftheInternetcanbesafelynavigated.Kidshavetobeon-line.Ifwetellourkidstheycan’thaveaccesstotheInternetwe’recuttingthemofffromtheirfuturesaidanexpert.Mostkidshavestartedtousesearchengines.ManyofthemaregreatforfindingtonsofinterestingInternetsitesandtheycanalsolocateplaceswhereyoumightnotwantyourkidstogo.Therearesearchenginesdesignedjustforkids.Acertainsoftwarecontainsonlysitesthathavebeenselectedassafe.Themostpopularwaytolimitaccesswouldbetousewhatisknownasacontentscreener.Butthiscan’tbewhollyreliableandthebestthingparentscandoistotalktotheirkidsandletthemknowwhatisOKornotOKtoseeordoontheInternet.AnotherwayisthatmumordadisnearbywhenthechildissurfingtheInternet.Afewothertips·Don’tputthePCinachild’sroombutkeepitinanareawheremumordadcankeepaneyeonthings.ThatalsomakestheInternetmoreofafamilyactivity.·Askyourchildwhatheorshehasbeendoingandaboutanyfriendstheymakeon-line.·Tellyourchildnottogiveon-linestrangerspersonalinformationespeciallylikeaddressandphonenumber.·Andtellyourchildrennevertotalktoanyonetheymeeton-lineoverthephonesendthemanythingacceptanythingfromthemoragreetomeetwiththemunlessyougoalong.Thepassageismainlyaboutthesubjectof______.
—Letmeintroducemyself.I'mAlbert. —
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegreeofhealthandwealthandothercomfortsoflifeonebecomeshappyandtheotherbecomesunhappy.Thisarisesfromthedifferentwaysinwhichtheyconsiderthingspersonseventsandtheresultingeffectsupontheirminds. Peoplewhoaretobehappyfixtheirattentionontheconvenienceofthings;thepleasantpartsofconversationthewellprepareddishesthegoodnessofthewineandthefineweather.Theyenjoyallthecheerfulthings.Thosewhoaretobeunhappythinkandspeakonlyoftheoppositethings.Thereforetheyarecontinuallydissatisfied.Bytheirremarkstheysourthepleasureofsocietyoffendhurtmanypeopleandmakethemselvesdisagreeableeverywhere.Ifthisturnofmindwasfoundedinnaturesuchunhappypersonswouldbethemoretobepitied.Theintentionofcriticizingandbeingdislikedisperhapstakenupbyimitation.Itgrowsintoahabitunknowntoitspossessors.Thehabitmaybestrongbutitmaybecuredwhenthosewhohaveitrealizeitsbadeffectsontheirinterestsandtastes.Ihopethislittlewarningmayheofservicetothemandhelpthemchangethishabit. Althoughinfactitischieflyanactoftheimaginationithasseriousresultsinlifesinceitbringsondeepsorrowandbadluck.Thosepeopleoffendmanyothers;nobodylovesthemandnoonetreatsthemwithmorethanthemostcommonpolitenessandrespect.Thisfrequentlyputstheminbadtemperanddrawsthemintoarguments.Iftheyaimatgettingsomeadvantagesinsocialpositionorfortunenobodywishesthemsuccess.Norwillanyonestartasteporspeakawordtofavortheirhopes.Iftheybringonthemselvespublicobjectionsnoonewilldefendorexcusethemandmanywilljointocriticizetheirwrongdoings.Theseshouldchangethisbadhabitandbepleasedwithwhatispleasingwithoutworryingneedlesslyaboutthemselvesandothers.Iftheydonotitwillbegoodforotherstoavoidanycontactwiththem.Otherwiseitcanbedisagreeableandsometimesveryinconvenientespeciallywhenonebecomesmixedupintheirquarrels. Ifsuchunhappypersonsinsistonkeepingthehabittheauthorsuggeststhatpeopleshould.
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegreeofhealthandwealthandothercomfortsoflifeonebecomeshappyandtheotherbecomesunhappy.Thisarisesfromthedifferentwaysinwhichtheyconsiderthingspersonseventsandtheresultingeffectsupontheirminds. Peoplewhoaretobehappyfixtheirattentionontheconvenienceofthings;thepleasantpartsofconversationthewellprepareddishesthegoodnessofthewineandthefineweather.Theyenjoyallthecheerfulthings.Thosewhoaretobeunhappythinkandspeakonlyoftheoppositethings.Thereforetheyarecontinuallydissatisfied.Bytheirremarkstheysourthepleasureofsocietyoffendhurtmanypeopleandmakethemselvesdisagreeableeverywhere.Ifthisturnofmindwasfoundedinnaturesuchunhappypersonswouldbethemoretobepitied.Theintentionofcriticizingandbeingdislikedisperhapstakenupbyimitation.Itgrowsintoahabitunknowntoitspossessors.Thehabitmaybestrongbutitmaybecuredwhenthosewhohaveitrealizeitsbadeffectsontheirinterestsandtastes.Ihopethislittlewarningmayheofservicetothemandhelpthemchangethishabit. Althoughinfactitischieflyanactoftheimaginationithasseriousresultsinlifesinceitbringsondeepsorrowandbadluck.Thosepeopleoffendmanyothers;nobodylovesthemandnoonetreatsthemwithmorethanthemostcommonpolitenessandrespect.Thisfrequentlyputstheminbadtemperanddrawsthemintoarguments.Iftheyaimatgettingsomeadvantagesinsocialpositionorfortunenobodywishesthemsuccess.Norwillanyonestartasteporspeakawordtofavortheirhopes.Iftheybringonthemselvespublicobjectionsnoonewilldefendorexcusethemandmanywilljointocriticizetheirwrongdoings.Theseshouldchangethisbadhabitandbepleasedwithwhatispleasingwithoutworryingneedlesslyaboutthemselvesandothers.Iftheydonotitwillbegoodforotherstoavoidanycontactwiththem.Otherwiseitcanbedisagreeableandsometimesveryinconvenientespeciallywhenonebecomesmixedupintheirquarrels. Thephrasesourthepleasureofsocietymostnearlymeans.
WhenDavewaseighteenheboughtasecondhandcarfor200sothathecouldtraveltoandfromworkmore1thanbybus.Itworkedquitewellforafewyearsbutthenitgotsooldanditwascostinghim2muchinrepairsthathedecidedthathehadbetter3it. Heaskedamonghisfriendstoseeifanyonewasparticularly4tobuyacheapcarbuttheyallknewthatitwasfallingtopiecesso5ofthemhadanydesiretobuyit.Dave’sfriendSamsawthathewas6whentheymetoneeveningandsaid"What’s7Dave" DavetoldhimandSamanswered"WellwhataboutadvertisingitinthepaperYoumay8moreforitthatwaythanthecostoftheadvertisement!"ThinkingthatSam’s9wassensibleheputanadvertisementinaneveningpaperwhichread"Forsale:smallcar10verylittlepetrolonlytwoowners.Bargainat50."Fortwodaysaftertheadvertisementfirstappearedtherewasno11.ButthenonSaturdayeveninghehadanenquiry.Amanrangupandsaidhewouldliketo12himaboutthecar."Allright"Davesaidfeelinghappy.Heaskedthemanwhetherteno’clockthenextmorningwouldbe13ornot."Fine"themansaid"andI’ll14mywife.Weintendtogoforarideinitto15it." ThenextmorningataquartertotenDaveparkedthecarinthesquareoutsidehisfrontdoor16towaitthereforthepeoplewhohad17hisadvertisement.EvenDavehadto18thatthecarreallylookedlikeawreck.Thensoonafterhehadgotthecarasclean19itcouldbeapolicecarstoppedjustbehindhimandapolicemangotout.HelookedatDave’scarandthensaid"Haveyoureportedthis20tousyetsir/ 8.
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