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B Many great inventions are greeted with ridicule and disbelief. The invention of the airplane w...
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Therehavebeenmanygreatinventionsthatchangethewaywe
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invention; invented; inventors
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—MayItakemylunchtothereadingroom —Noyou______.Youshouldfinishitrighthere.
Stoneisallaroundus.Stoneisusuallyveryhardbutitcanalsobes____48____.Stoneshavemanyuses.Insomecountriesa____49____carvebeautifulthingsoutofsoftstonesbecausetheycanbeshapedeasily.Ina____50____timespeoplecarvedsmallpersonsoranimalsoutofsoftstoneswhichcouldbecarriedalongwith.WhileinsomeEuropeanc____51____statuesarecarvedfromhardstonesandtheydonotchangeeasily.Insummerthehotsuns____52____onthesestatuesandinwinterthesnowfallsonthembuttheystillr____53____beautiful. Stoneisstrongandlong-lasting.Soitisgoode____54____forbuildings.Ahousebuiltofstonedoesnotcatchfireaseasilyasi____55____madeofwood.Somestonesarecoloredsotheymakethebuildingslookw____56____.Peoplecanalsogetafirewithstones.Besidessomekindsofstonescanbeusedtom____57____jewelry.We’refoundstonesarereallyamazing.
Therehavebeenmanygreatinventionsthatchangethewaywelive.Thefirstgreat____29____wasonethatisstillveryimportanttoday—thewheel.Thismadeiteasyforman____30____heavythingsandtotravellongdistances.Forhundredsofyearsafterthattherewere____31____inventionsthathadasmucheffectasthewheel.Thenintheearly1800’stheworldstartedtochange____32____.Therewaslittleunknownlandleftintheworld.Peopledidnothavetoexploremuchanymore.Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.____33____themwerethecameratheelectriclightandtheradio.Thesehaveallbecomeabigpartofourlifetoday. Thefirstpartofthe20thcenturysawmoregreatinventions.Thehelicopterin1909.Movies____34____soundin1926.Thecomputerin1928.Andjetplanesin1930.Thiswasalsoatimewhenanew____35____wasfirstmade.Nyloncameoutin1935.Itchangedthekindofclothespeoplewear.Ofcoursenewinventionscontinuedtobemade.Manbeganlooking____36____waystogointospace.Russiamadethefirststep.ThentheUnitedStatestookanother.SincethenothercountriesincludingChinaandJapan____37____theirstepsintospace.In1969mantookhisbiggeststepawayfromearth.____38____firstwalkedonthemoon.Thiswascertainlyjustabeginning.Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.
Stoneisallaroundus.Stoneisusuallyveryhardbutitcanalsobes____48____.Stoneshavemanyuses.Insomecountriesa____49____carvebeautifulthingsoutofsoftstonesbecausetheycanbeshapedeasily.Ina____50____timespeoplecarvedsmallpersonsoranimalsoutofsoftstoneswhichcouldbecarriedalongwith.WhileinsomeEuropeanc____51____statuesarecarvedfromhardstonesandtheydonotchangeeasily.Insummerthehotsuns____52____onthesestatuesandinwinterthesnowfallsonthembuttheystillr____53____beautiful. Stoneisstrongandlong-lasting.Soitisgoode____54____forbuildings.Ahousebuiltofstonedoesnotcatchfireaseasilyasi____55____madeofwood.Somestonesarecoloredsotheymakethebuildingslookw____56____.Peoplecanalsogetafirewithstones.Besidessomekindsofstonescanbeusedtom____57____jewelry.We’refoundstonesarereallyamazing.
Imustdeclinebecausetheconditionsyouofferedarenot______.
根据各组对话内容从下面方框里提供的5个选项中选出能填入空白处的最佳选项 A:I’msorrytohavekeptyouwaitingforsolong. B:I’vebeenkillingtimebylisteningtomusic.
Therehavebeenmanygreatinventionsthatchangethewaywelive.Thefirstgreat____29____wasonethatisstillveryimportanttoday—thewheel.Thismadeiteasyforman____30____heavythingsandtotravellongdistances.Forhundredsofyearsafterthattherewere____31____inventionsthathadasmucheffectasthewheel.Thenintheearly1800’stheworldstartedtochange____32____.Therewaslittleunknownlandleftintheworld.Peopledidnothavetoexploremuchanymore.Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.____33____themwerethecameratheelectriclightandtheradio.Thesehaveallbecomeabigpartofourlifetoday. Thefirstpartofthe20thcenturysawmoregreatinventions.Thehelicopterin1909.Movies____34____soundin1926.Thecomputerin1928.Andjetplanesin1930.Thiswasalsoatimewhenanew____35____wasfirstmade.Nyloncameoutin1935.Itchangedthekindofclothespeoplewear.Ofcoursenewinventionscontinuedtobemade.Manbeganlooking____36____waystogointospace.Russiamadethefirststep.ThentheUnitedStatestookanother.SincethenothercountriesincludingChinaandJapan____37____theirstepsintospace.In1969mantookhisbiggeststepawayfromearth.____38____firstwalkedonthemoon.Thiswascertainlyjustabeginning.Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.
根据各组对话内容从下面方框里提供的5个选项中选出能填入空白处的最佳选项 A:You’vecookedsuchadeliciousdinnerMrs.White.B:
—WhenshallwegototheSummerPalace —Makeit______dayyoulike;itdoesn’tmattertome.
Stoneisallaroundus.Stoneisusuallyveryhardbutitcanalsobes____48____.Stoneshavemanyuses.Insomecountriesa____49____carvebeautifulthingsoutofsoftstonesbecausetheycanbeshapedeasily.Ina____50____timespeoplecarvedsmallpersonsoranimalsoutofsoftstoneswhichcouldbecarriedalongwith.WhileinsomeEuropeanc____51____statuesarecarvedfromhardstonesandtheydonotchangeeasily.Insummerthehotsuns____52____onthesestatuesandinwinterthesnowfallsonthembuttheystillr____53____beautiful. Stoneisstrongandlong-lasting.Soitisgoode____54____forbuildings.Ahousebuiltofstonedoesnotcatchfireaseasilyasi____55____madeofwood.Somestonesarecoloredsotheymakethebuildingslookw____56____.Peoplecanalsogetafirewithstones.Besidessomekindsofstonescanbeusedtom____57____jewelry.We’refoundstonesarereallyamazing.
下列关于信息的表述中错误的一项是
Stoneisallaroundus.Stoneisusuallyveryhardbutitcanalsobes____48____.Stoneshavemanyuses.Insomecountriesa____49____carvebeautifulthingsoutofsoftstonesbecausetheycanbeshapedeasily.Ina____50____timespeoplecarvedsmallpersonsoranimalsoutofsoftstoneswhichcouldbecarriedalongwith.WhileinsomeEuropeanc____51____statuesarecarvedfromhardstonesandtheydonotchangeeasily.Insummerthehotsuns____52____onthesestatuesandinwinterthesnowfallsonthembuttheystillr____53____beautiful. Stoneisstrongandlong-lasting.Soitisgoode____54____forbuildings.Ahousebuiltofstonedoesnotcatchfireaseasilyasi____55____madeofwood.Somestonesarecoloredsotheymakethebuildingslookw____56____.Peoplecanalsogetafirewithstones.Besidessomekindsofstonescanbeusedtom____57____jewelry.We’refoundstonesarereallyamazing.
Excel电子表格中的数据可用各种形象的图表来表示下面哪一种不是Excel中的图表类型
B Peoplehavesmokedtobaccoforcenturiesandtheharmfuleffectsoftobaccosmokehavebeenseenascontroversialsinceatleastthe16thcenturywhenEuropeanexplorersintroducedtobaccotoNorthAmerica.Cigaretteinfacttypicallycontainsmorethan4700chemicalcompounds43ofwhicharebelievedtocausecancer.Compoundssuchastarandsulphurdomostoftheharmwhilstapoisonouscompoundknownasnicotinemakessmokingverydifficulttogiveup. In1964acommitteeofdoctorsandscientistsintheUnitedStatesofAmericaconcludedthatnearlyallformsoflungcancerwerecausedbythenegativeeffectsofsmoking.Theyalsoreportedhoweverthatsmokingleadstomanyotherdiseasessuchaschronicbronchitisandemphysemadiseaseofthelung.Amoreworryingreporthoweverarguedthatasmanyas50000peopledieeachyearinAmericafromtheeffectsofpassivesmokingbreathinginotherpeople’ssmoke.Youngchildrenarevulnerablebecauseitisbelievedrestrictionsinoxygensuppliesleadtostuntedgrowth.Butpregnantwomenareespeciallysusceptibletothistypeofexposurebecausethesmokepreventsoxygensuppliesinthebloodstreamreachingthefoetustherebyinhibitingnaturaldevelopment.Smokinghasthusbeendeemedmoreharmfulthantheeffectsofalcoholandhasledtothebecomingofsmokinginpublic-parksinsomeares. ThemostrecentresearchcarriedoutintheUKhoweversuggestthatifyounggirlsbeginsmokingdaringpubertyearlyteenageyearswhichiscommonamongstteenagersinEuropetheyarefarmorelikelytocontractbecausecancerastheygrowolder.Moreoverwhilstthedangersofcontractingdiseasessuchasbronchitisandevenlungcancerneverletup.Insteaditremainswiththegirlforthereminderofhernaturallife. TheseandotherfindingshavepromotedmanyEuropeancountriestolaunchanosmokingcampaigninschoolsaimedatmakingyoungvulnerableadolescentswhoareinatransitionperiodbetweenchildrenandadulthoodawareofthedangersofsmokingwiththeadagethatpreventionisbetterthancure.Doctorsandscientistsbelievethatsmoking______.
根据各组对话内容从下面方框里提供的5个选项中选出能填入空白处的最佳选项 A:I’mleavingforHongKongforaweekendbreak. B:
Stoneisallaroundus.Stoneisusuallyveryhardbutitcanalsobes____48____.Stoneshavemanyuses.Insomecountriesa____49____carvebeautifulthingsoutofsoftstonesbecausetheycanbeshapedeasily.Ina____50____timespeoplecarvedsmallpersonsoranimalsoutofsoftstoneswhichcouldbecarriedalongwith.WhileinsomeEuropeanc____51____statuesarecarvedfromhardstonesandtheydonotchangeeasily.Insummerthehotsuns____52____onthesestatuesandinwinterthesnowfallsonthembuttheystillr____53____beautiful. Stoneisstrongandlong-lasting.Soitisgoode____54____forbuildings.Ahousebuiltofstonedoesnotcatchfireaseasilyasi____55____madeofwood.Somestonesarecoloredsotheymakethebuildingslookw____56____.Peoplecanalsogetafirewithstones.Besidessomekindsofstonescanbeusedtom____57____jewelry.We’refoundstonesarereallyamazing.
二根据下面一段话的内容从方框内的7个选项中选出能填入空白处的最佳选项其中有两项为多余选项A:Excuseme.16B:Yes.Youdon’tknowmeofcourse.Idon’tteachhere.Ijustgiveoralexaminationsherenowandthen.Don’tbenervous.A:NervousWhoMeB:17I’mgoingtoaskyouafewquestions.ThenwearegoingtohaveashortconversationinEnglish.DoyouunderstandA:YesofcourseIdo.18B:Aftertheexaminationplease.FirstofallwhyareyoulearningEnglishA:WhyamIlearningEnglishB:YesImeanwhatareyougoingtodowithitAreyougoingtobeateacherofEnglishorwhatelseA:19Ireallymustaskyousomethingfirst.B:Verywell.Ifyouinsistgoaheadplease!A:WouldyoulikeacupofcoffeeB:PardonWhatdidyousayA:YouseeI’mEnglish.I’moneoftheteachershere.Icametoaskyouifyouwouldlikeacupofcoffee.B:20.Andthankyousomuch! 第二空应选择
A An8-year-oldchildheardherparentstalkingaboutherlittlebrother.Allsheknewwasthathewasverysickandtheyhadnomoney.Onlyaveryexpensiveoperationcouldsavehimnowandtherewasnoonetolendthemthemoney. Whensheheardherdaddysaytohertearfulmother"onlyamiraclecansavehimnow".Thelittlegirlwenttoherbedroomandpulledhermoneyfromherpiggybankandcounteditcarefully. Shehurriedtothelocaldrugstorewiththemoneyinherhand."Andwhatdoyouwant"askedthesalesman."It’sformylittlebrother"thegirlanswered."HeisreallyreallysickandIwanttobuyamiracle.""Pardon"saidthesalesman."MybrotherAndrewhassomethingbadgrowinginsidehisheadandmydaddysaysonlyamiraclecansavehim.SohowmuchdoesamiraclecostWedidn’tsellamiracleherechildI’msorry."thesalesmansaidwithasmile."Listenifitisn’tenoughIcantryandgetsomemore.Justtellmehowmuchitcosts." Awell-dressedmanhearditandasked"whatkindofmiracledoesyourbrotherneedIdon’tknow"sheansweredwithhereyesfulloftears."He’sreallysickandmumsaysheneedsanoperation.Butmydaddycan’tpayforit.SoIhavebroughtallmymoney.""Howmuchdoyouhave"askedtheman."1.11dollarsbutIcantryandgetsomemore."sheanswered."Wellwhatluck!"saidtheman."1.11dollarsthepriceofamiracleforyourlittlebrother." Hetookupthegirl’shandandsaid"Takemetowhereyoulive.Iwanttoseeyourbrotherandmeetyourparents.Let’sseeifIhavethemiracleyouneed." Thatwell-dressedmanwasDr.Carltonafamoussurgeon.Theoperationwassuccessfulanditwasn’tlongbeforeAndrewwashomeagain.Thelittlegirlwashappy.Sheknewexactlyhowmuchthemiraclecost...onedollarandelevencents...plusthefaithofalittlechild.Whatcanbeinferredfromthepassage
Therehavebeenmanygreatinventionsthatchangethewaywelive.Thefirstgreat____29____wasonethatisstillveryimportanttoday—thewheel.Thismadeiteasyforman____30____heavythingsandtotravellongdistances.Forhundredsofyearsafterthattherewere____31____inventionsthathadasmucheffectasthewheel.Thenintheearly1800’stheworldstartedtochange____32____.Therewaslittleunknownlandleftintheworld.Peopledidnothavetoexploremuchanymore.Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.____33____themwerethecameratheelectriclightandtheradio.Thesehaveallbecomeabigpartofourlifetoday. Thefirstpartofthe20thcenturysawmoregreatinventions.Thehelicopterin1909.Movies____34____soundin1926.Thecomputerin1928.Andjetplanesin1930.Thiswasalsoatimewhenanew____35____wasfirstmade.Nyloncameoutin1935.Itchangedthekindofclothespeoplewear.Ofcoursenewinventionscontinuedtobemade.Manbeganlooking____36____waystogointospace.Russiamadethefirststep.ThentheUnitedStatestookanother.SincethenothercountriesincludingChinaandJapan____37____theirstepsintospace.In1969mantookhisbiggeststepawayfromearth.____38____firstwalkedonthemoon.Thiswascertainlyjustabeginning.Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.
Therehavebeenmanygreatinventionsthatchangethewaywelive.Thefirstgreat____29____wasonethatisstillveryimportanttoday—thewheel.Thismadeiteasyforman____30____heavythingsandtotravellongdistances.Forhundredsofyearsafterthattherewere____31____inventionsthathadasmucheffectasthewheel.Thenintheearly1800’stheworldstartedtochange____32____.Therewaslittleunknownlandleftintheworld.Peopledidnothavetoexploremuchanymore.Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.____33____themwerethecameratheelectriclightandtheradio.Thesehaveallbecomeabigpartofourlifetoday. Thefirstpartofthe20thcenturysawmoregreatinventions.Thehelicopterin1909.Movies____34____soundin1926.Thecomputerin1928.Andjetplanesin1930.Thiswasalsoatimewhenanew____35____wasfirstmade.Nyloncameoutin1935.Itchangedthekindofclothespeoplewear.Ofcoursenewinventionscontinuedtobemade.Manbeganlooking____36____waystogointospace.Russiamadethefirststep.ThentheUnitedStatestookanother.SincethenothercountriesincludingChinaandJapan____37____theirstepsintospace.In1969mantookhisbiggeststepawayfromearth.____38____firstwalkedonthemoon.Thiswascertainlyjustabeginning.Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.
A An8-year-oldchildheardherparentstalkingaboutherlittlebrother.Allsheknewwasthathewasverysickandtheyhadnomoney.Onlyaveryexpensiveoperationcouldsavehimnowandtherewasnoonetolendthemthemoney. Whensheheardherdaddysaytohertearfulmother"onlyamiraclecansavehimnow".Thelittlegirlwenttoherbedroomandpulledhermoneyfromherpiggybankandcounteditcarefully. Shehurriedtothelocaldrugstorewiththemoneyinherhand."Andwhatdoyouwant"askedthesalesman."It’sformylittlebrother"thegirlanswered."HeisreallyreallysickandIwanttobuyamiracle.""Pardon"saidthesalesman."MybrotherAndrewhassomethingbadgrowinginsidehisheadandmydaddysaysonlyamiraclecansavehim.SohowmuchdoesamiraclecostWedidn’tsellamiracleherechildI’msorry."thesalesmansaidwithasmile."Listenifitisn’tenoughIcantryandgetsomemore.Justtellmehowmuchitcosts." Awell-dressedmanhearditandasked"whatkindofmiracledoesyourbrotherneedIdon’tknow"sheansweredwithhereyesfulloftears."He’sreallysickandmumsaysheneedsanoperation.Butmydaddycan’tpayforit.SoIhavebroughtallmymoney.""Howmuchdoyouhave"askedtheman."1.11dollarsbutIcantryandgetsomemore."sheanswered."Wellwhatluck!"saidtheman."1.11dollarsthepriceofamiracleforyourlittlebrother." Hetookupthegirl’shandandsaid"Takemetowhereyoulive.Iwanttoseeyourbrotherandmeetyourparents.Let’sseeifIhavethemiracleyouneed." Thatwell-dressedmanwasDr.Carltonafamoussurgeon.Theoperationwassuccessfulanditwasn’tlongbeforeAndrewwashomeagain.Thelittlegirlwashappy.Sheknewexactlyhowmuchthemiraclecost...onedollarandelevencents...plusthefaithofalittlechild.Thelittlegirlsaidagainandagain"ifitisn’tenoughIcantryandgetsomemore"thatmeans______.
从古到今人类共经历了五次信息技术的重大发展历程目前正处于的阶段是
英文缩写blog的中文含意是
ThisdictionarywhichIboughtyesterdayhasbeenhighly______bymyprofessor.
Hehastwokitesoneisbig______issmall.
Afarmerarrived______awomen’shouse.
A An8-year-oldchildheardherparentstalkingaboutherlittlebrother.Allsheknewwasthathewasverysickandtheyhadnomoney.Onlyaveryexpensiveoperationcouldsavehimnowandtherewasnoonetolendthemthemoney. Whensheheardherdaddysaytohertearfulmother"onlyamiraclecansavehimnow".Thelittlegirlwenttoherbedroomandpulledhermoneyfromherpiggybankandcounteditcarefully. Shehurriedtothelocaldrugstorewiththemoneyinherhand."Andwhatdoyouwant"askedthesalesman."It’sformylittlebrother"thegirlanswered."HeisreallyreallysickandIwanttobuyamiracle.""Pardon"saidthesalesman."MybrotherAndrewhassomethingbadgrowinginsidehisheadandmydaddysaysonlyamiraclecansavehim.SohowmuchdoesamiraclecostWedidn’tsellamiracleherechildI’msorry."thesalesmansaidwithasmile."Listenifitisn’tenoughIcantryandgetsomemore.Justtellmehowmuchitcosts." Awell-dressedmanhearditandasked"whatkindofmiracledoesyourbrotherneedIdon’tknow"sheansweredwithhereyesfulloftears."He’sreallysickandmumsaysheneedsanoperation.Butmydaddycan’tpayforit.SoIhavebroughtallmymoney.""Howmuchdoyouhave"askedtheman."1.11dollarsbutIcantryandgetsomemore."sheanswered."Wellwhatluck!"saidtheman."1.11dollarsthepriceofamiracleforyourlittlebrother." Hetookupthegirl’shandandsaid"Takemetowhereyoulive.Iwanttoseeyourbrotherandmeetyourparents.Let’sseeifIhavethemiracleyouneed." Thatwell-dressedmanwasDr.Carltonafamoussurgeon.Theoperationwassuccessfulanditwasn’tlongbeforeAndrewwashomeagain.Thelittlegirlwashappy.Sheknewexactlyhowmuchthemiraclecost...onedollarandelevencents...plusthefaithofalittlechild.Whatwasthetroubleisthelittlegirl’sfamily
Therehavebeenmanygreatinventionsthatchangethewaywelive.Thefirstgreat____29____wasonethatisstillveryimportanttoday—thewheel.Thismadeiteasyforman____30____heavythingsandtotravellongdistances.Forhundredsofyearsafterthattherewere____31____inventionsthathadasmucheffectasthewheel.Thenintheearly1800’stheworldstartedtochange____32____.Therewaslittleunknownlandleftintheworld.Peopledidnothavetoexploremuchanymore.Inthesecondhalfofthe19thcenturymanygreatinventionsweremade.____33____themwerethecameratheelectriclightandtheradio.Thesehaveallbecomeabigpartofourlifetoday. Thefirstpartofthe20thcenturysawmoregreatinventions.Thehelicopterin1909.Movies____34____soundin1926.Thecomputerin1928.Andjetplanesin1930.Thiswasalsoatimewhenanew____35____wasfirstmade.Nyloncameoutin1935.Itchangedthekindofclothespeoplewear.Ofcoursenewinventionscontinuedtobemade.Manbeganlooking____36____waystogointospace.Russiamadethefirststep.ThentheUnitedStatestookanother.SincethenothercountriesincludingChinaandJapan____37____theirstepsintospace.In1969mantookhisbiggeststepawayfromearth.____38____firstwalkedonthemoon.Thiswascertainlyjustabeginning.Newinventionswillsomedayallowustodothingswehaveneveryetdreamedof.
B Peoplehavesmokedtobaccoforcenturiesandtheharmfuleffectsoftobaccosmokehavebeenseenascontroversialsinceatleastthe16thcenturywhenEuropeanexplorersintroducedtobaccotoNorthAmerica.Cigaretteinfacttypicallycontainsmorethan4700chemicalcompounds43ofwhicharebelievedtocausecancer.Compoundssuchastarandsulphurdomostoftheharmwhilstapoisonouscompoundknownasnicotinemakessmokingverydifficulttogiveup. In1964acommitteeofdoctorsandscientistsintheUnitedStatesofAmericaconcludedthatnearlyallformsoflungcancerwerecausedbythenegativeeffectsofsmoking.Theyalsoreportedhoweverthatsmokingleadstomanyotherdiseasessuchaschronicbronchitisandemphysemadiseaseofthelung.Amoreworryingreporthoweverarguedthatasmanyas50000peopledieeachyearinAmericafromtheeffectsofpassivesmokingbreathinginotherpeople’ssmoke.Youngchildrenarevulnerablebecauseitisbelievedrestrictionsinoxygensuppliesleadtostuntedgrowth.Butpregnantwomenareespeciallysusceptibletothistypeofexposurebecausethesmokepreventsoxygensuppliesinthebloodstreamreachingthefoetustherebyinhibitingnaturaldevelopment.Smokinghasthusbeendeemedmoreharmfulthantheeffectsofalcoholandhasledtothebecomingofsmokinginpublic-parksinsomeares. ThemostrecentresearchcarriedoutintheUKhoweversuggestthatifyounggirlsbeginsmokingdaringpubertyearlyteenageyearswhichiscommonamongstteenagersinEuropetheyarefarmorelikelytocontractbecausecancerastheygrowolder.Moreoverwhilstthedangersofcontractingdiseasessuchasbronchitisandevenlungcancerneverletup.Insteaditremainswiththegirlforthereminderofhernaturallife. TheseandotherfindingshavepromotedmanyEuropeancountriestolaunchanosmokingcampaigninschoolsaimedatmakingyoungvulnerableadolescentswhoareinatransitionperiodbetweenchildrenandadulthoodawareofthedangersofsmokingwiththeadagethatpreventionisbetterthancure.Governmentindevelopedcountriesaremostconnectedabout______.
在一个记录学生成绩的电子表格文件中如果要快速找到某门课程成绩最好的学生需要使用到的功能是
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