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libera
tion
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atten
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下列物质中一定属于纯净物的是①由同种元素组成的物质②含有三种元素熔点为895℃的物质③只含有两种元素
②③
④⑤
①④
②⑤
某温度时在一个2L的密闭容器中X.Y.Z.三种物质的物质的量随时间的变化曲线如图所示根据图中数据试填
若的展开式中不含有常数项那么的取值可以是
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8
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Thelifeofthephoenixisdescribed
with the use of facts
in a humorous way
in an unclear way
step-by-step
Step1OpentheCDplayerbyliftingtheliD.Step2TaketheCD
Whatsuggestionoftheguestsistrue
Break the top off.
Use the mouth.
Step by step.
Put it on the floor.
已知函数则
—______youngman.Ifyou’relateforworkagainyou’lllose
Watch your step
Take it easy
Use your head
Have a look
下列属于物理变化的是
石油蒸馏
淀粉水解
蛋白质水解
煤的干馏
如图在正方体ABCD—中分别是棱的中点则异面直线与所成的角的大小是
Object-orientedanalysisOOAisasemiformalspecific
use-case modeling
class modeling
dynamic modeling
behavioral modeling
⑴写出下列反应的化学方程式①乙炔与足量溴水②C6H5–OH与浓溴水③CH3CH2CHO和新制CuOH
正整数按右表的规律排列则上起第20行左起第21列的数应为_________.
正整数按右表的规律排列则上起第20行左起第21列的数应为_________.
Object-orientedanalysisOOAisasemiformalspecific
use-case modeling
class modeling
dynamic modeling
behavioral modeling
已知函数在区间上的值域为1求的值;2若关于的函数在区间上为单调函数求实数的取值范围.
Iftheresearchersaresuccessfultheyanimportantstepin
make
would make
will make
will have made
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Iwasshockedtohearthatyourhouseinto.
Oneofthemostauthoritativevoicesspeakingtoustodayisofcoursethevoiceoftheadvertisers.Itsstridentclamordominatesourlives.Itshoutsatusfromthetelevisionscreenandtheradioloudspeakers;wavestousfromeverypageofthenewspaper;plucksatoursleevesontheIescalator;signalstousfromtheroadsidebillboardsalldayandflashesmessagestousincoloredlightsallnight.Ithasforcedonusawholenewconceptionofthesuccessfulmanasamannolessthan20%ofwhosemailconsistsofannouncementsofgiantcarpetsales. AdvertisinghasbeenamongEngland’sbiggestgrowthindustriessincethewarintermsoftheratioofmoneyearningstodemonstrableachievement.Whyallthisfantasticexpenditure Perhapstheansweristhatadvertisingsavesthemanufacturersfromhavingtothinkaboutthecustomer.AtthestageofdesigninganddevelopingaproductthereisquiteenoughtothinIaboutwithoutworryingoverwhetheranybodywillwanttobuyit.Thedesignerisbusyenoughwithoutaddingcustomer-appealtoallhisotherproblemsofman-hoursandmachinetolerancesandstressfactors.Sotheyjustgoaheadandmadethethingandleaveitlotheadvertisertofindelevenwaysofmakingitappealtopurchasersafi1ertheyhavefinisheditbypretendingthatitconfersstatusorattractsloveorsignifiesmanliness.Iftheadvertisingagencycandothisauthoritativelyenoughthemanufacturerisincover. Othermanufacturersfindadvertisingsavesthemchangingtheirproduct.Andmanufacturershatechange.Theidealproductisonewhichgoesonunchangedforever. Ifthereforeforonereasonoranothersomealterationseemscalledfor-howmuchbettertochangetheimagethepacketorthepitchmadebyproductratherthangotoalltheinconvenienceofchangingtheproductitself. AccordingtothepassagemodernadvertisingisauthoritativebecauseofIhewayit
Pleasebemore______attentiontoyour-studies.
Itisgoodmannersforyoutokeepquietinalibraryotherreaders.
Effortstoeducatepeopleabouttherisksofsubslanceabuseseemtodetersomepeoplefromusing-dangeroussubstancesifsucheffortsarerealisticaboutwhatisgenuinelydangerousandwhatisnot.ObserveddeclinesintheuseofsuchdrugsasLSDPCPandQuaaludessincetheearly1970’sareprobablyrelatedtoincreasedawarenessoftherisksoftheiruseandsomeofthis-awarenesswastheresultofwarningsaboutthesedrugsin"underground"papersreadbydrugusers.Suchsourcesareinfluentialbecausetheydonotgiveasimple"alldrugsareterribleforyou"message.Drugusersknowtherearebigvariationsindangeramongdrugsandantidrugeducationthatignoresordeniesthisislikelytoberidiculed.ThisisillustratedbythepopularityamongyoungmarijuanausersofReeferMadnessawidelyunrealisticpropagandafilmagainstmarijuanamadeinthe1930s.Thisfilmmadetheroundsofcollegecampusesinthe1970sandjoinedrock-musicvideosoncabletelevision’sMTVinthe1980s.Insteadofdeterringmarijuanauseitbecameacultfilmamongusersmanyofwhomgothightowatchit. Althoughpersuasioncanworkforsomepeopleifitisbalancedandreasonableotherpeopleseemimmunetothemostreasonededucationaefforts.Millionshavestartedsmokingeventhoughtheconsiderablehealthrisksofsmokinghavebeenwellknownandpublicizedforyears.Moreovertheusefulnessofeducationliesinprimaryprevention:preventionofabuseamongthosewhopresentlyhavenoproblems.HenceBomier’s1978contentionthat"ifthePepsigenerationcanbepersuadedtodrinkpopwinetheycanbepersuadednottodrinkitwhiledriving"isprobablynotcorrectsincemostdrunkendrivingisdonebypeoplewhoalreadyhavesignificantdrinkingproblemsandhenceseemnottobedissuadedevenbymuchstrongermeasuressuchaslossofadriver’slicense. Thebesttitleforthepassagewouldbe
Theinhabitantsoftheeartharedividednotonlybyracenationreligionorideologybutalsoinasensebytheirpositionintime.Examining-thepresentpopulationofIheglobewefindatinygroupwhostilllivehuntingandfood-foragingasmendidmillenniaago. OthersthevastmajorityofmankinddependnoIonbear-huntingorberry-pickingbutonagriculture.Theyliveinmanyrespectsastheirancestorsdidcenturiesago.Thesetwogroupstakentogethercomposeperhaps70percentofalllivinghumanbeings.Theyarepeopleofthepast. Bycontrastsomewhatmorethan25percentoftheearth’spopulationcanbefoundintheindustrializedsocieties.Theyleadmodernlives.Theyareproductsofthefirsthalfofthetwentiethcenturymoldedbymechanizationandmasseducationbroughtupwithlingeringmemoriesoftheirowncountry’sagriculturalpast.Theyareineffectthepeopleofthepresent. Theremaining2or3percentoftheworld’spopulationhoweverarenolongerpeopleofeitherthepastorthepresent.ForwithinthemaincantersoftechnologicalandculturalchangeinSantaMonicaCaliforniaandCan-bridgeMassachusettsinNewYorkandLondonandTokyoaremillionsofmenandwomenwhocanalreadybesaidtobelivingthewayoflifeofIhefuture.Trendmakersoftenwithoutbeingawareofittheylivetodayasmillionswilllivetomorrow.AndwhiletheyaccountforonlyafewpercentofIlieglobalpopulationtodaytheyalreadyformaninternationalnationofthefutureinourmidst.Theyaretheadvanceagentsofmantheearliestcitizensoftheworld-widesuper-industrialsocietynowinthethroesofbirth. WhatmakesthemdifferentfromtherestofmankindCertainlytheyarericherbettereducatedmoremobilethanthemajorityofIhehumanrace.Theyalsolivelonger.Butwhatspecificallymarksthepeopleofthefutureisthefactthattheyarealreadycaughtupinanewstepped-uppaceoflife.They"livefaster"thanthepeoplearoundthem. Accordingtothewriter70%ofallhumans
Shellyhadpreparedcarefullyforherbiologyexaminationsothatshecouldbesureofpassingitonherfirst
ForthepasttwoyearsIhavebeenworkingonstudents’evaluationofclassroomteaching.Ihavekeptarecordofinformalconversations36some300studentsforatleasttwenty-onecollegesanduniversities.Thestudentsweregenerallyfrankanddirectintheircomments37howcourseworkcouldbebetterpresented.Mostoftheremarkswerekindly38withtoleranceratherthanbitterness-andfrequentlyweresoftenedbythe39thatthestudentswerespeakingaboutsomenotallinstructors. Neverthelessasthefollowingsuggestionsandcommentsindicatestudentsfeel40withthings-as-they-areintheclassroom. Professorsshouldbediscouragedfromreadinglecturenotes."Itmakestheir41Monotonous单调的.” IftheyaregoingtoreadwhynotgiveoutcopiesofthelectureThenwe42needto43gotoclass.Professorsshouldavoidrepeatinginlecturesmaterialthatisinthetextbook. “44we’vereadthematerialwewantto44itorhearitelaboratedonnotrepeated.""Alotofstudentshatetobuya45textthattheprofessorhaswritten80onlytohavehislecturesrepeatit./ 42
Theinhabitantsoftheeartharedividednotonlybyracenationreligionorideologybutalsoinasensebytheirpositionintime.Examining-thepresentpopulationofIheglobewefindatinygroupwhostilllivehuntingandfood-foragingasmendidmillenniaago. OthersthevastmajorityofmankinddependnoIonbear-huntingorberry-pickingbutonagriculture.Theyliveinmanyrespectsastheirancestorsdidcenturiesago.Thesetwogroupstakentogethercomposeperhaps70percentofalllivinghumanbeings.Theyarepeopleofthepast. Bycontrastsomewhatmorethan25percentoftheearth’spopulationcanbefoundintheindustrializedsocieties.Theyleadmodernlives.Theyareproductsofthefirsthalfofthetwentiethcenturymoldedbymechanizationandmasseducationbroughtupwithlingeringmemoriesoftheirowncountry’sagriculturalpast.Theyareineffectthepeopleofthepresent. Theremaining2or3percentoftheworld’spopulationhoweverarenolongerpeopleofeitherthepastorthepresent.ForwithinthemaincantersoftechnologicalandculturalchangeinSantaMonicaCaliforniaandCan-bridgeMassachusettsinNewYorkandLondonandTokyoaremillionsofmenandwomenwhocanalreadybesaidtobelivingthewayoflifeofIhefuture.Trendmakersoftenwithoutbeingawareofittheylivetodayasmillionswilllivetomorrow.AndwhiletheyaccountforonlyafewpercentofIlieglobalpopulationtodaytheyalreadyformaninternationalnationofthefutureinourmidst.Theyaretheadvanceagentsofmantheearliestcitizensoftheworld-widesuper-industrialsocietynowinthethroesofbirth. WhatmakesthemdifferentfromtherestofmankindCertainlytheyarericherbettereducatedmoremobilethanthemajorityofIhehumanrace.Theyalsolivelonger.Butwhatspecificallymarksthepeopleofthefutureisthefactthattheyarealreadycaughtupinanewstepped-uppaceoflife.They"livefaster"thanthepeoplearoundthem. Fromwhatthewritersaystreadmakersarepeoplewho
DuringtheChristmasshoppingrushinLondontheinterestingstorywasreportedofatramp流浪汉whoapparentlythrou9hnofaultofhisownfoundhimselflockedinawell-knownchainstorelateonChristmasEve.Nodoubtthestorewascrowdedwithlast-minuteChristmasshoppers.andthestaffweredeadbeatandlongingtogethome.Allthepropersecuritychecksweremadebeforethestorewaslockedandtheylefttoenjoythethree-dayholidayuntroubledbycustomersdesperatetogetlast-minuteChristmaspresents. Howeverthatmaybeourtrampfoundhimselfaloneinthe.storeanddecidedtomakethebestofit.Therewasfooddrinkbeddingandcampingequipmentofwhichhemadegooduse.Theremustasohavebeen-televisionsetsandradios.Thoughitwasnotreportedifhetookadvantageofthesefacilitieswhentheshopre-openedhewasdiscoveredinbedwithalargenumberofemptybottlesbesidehim.Heseemstohavebeenamanofgoodhumorandphilosophictemperament--asindeedtramps’verycommonlyare.EveryoneelsewasenjoyingChristmassohesawnogoodreasonwhyheshouldnotdothesame.Hesubmittedcheerfullyenoughtobeingtakenawaybythepolice.PerhapshehadhadabetterChristmasthanusual.Hewassentloprisonforsevendays.Thejudgeawardednocompensation赔偿tothechainstoreforthefoodanddrinkourtramphadconsumed.Theyhadinhisopinionalreadyreceivedvaluablefreepublicityfromthecoveragethestoryreceivedinthenewspapersandontelevision. PerhapsthejudgehadhadagoodChristmastoo. Whenthetrampwasarrestedhe
ForthepasttwoyearsIhavebeenworkingonstudents’evaluationofclassroomteaching.Ihavekeptarecordofinformalconversations36some300studentsforatleasttwenty-onecollegesanduniversities.Thestudentsweregenerallyfrankanddirectintheircomments37howcourseworkcouldbebetterpresented.Mostoftheremarkswerekindly38withtoleranceratherthanbitterness-andfrequentlyweresoftenedbythe39thatthestudentswerespeakingaboutsomenotallinstructors. Neverthelessasthefollowingsuggestionsandcommentsindicatestudentsfeel40withthings-as-they-areintheclassroom. Professorsshouldbediscouragedfromreadinglecturenotes."Itmakestheir41Monotonous单调的.” IftheyaregoingtoreadwhynotgiveoutcopiesofthelectureThenwe42needto43gotoclass.Professorsshouldavoidrepeatinginlecturesmaterialthatisinthetextbook. “44we’vereadthematerialwewantto44itorhearitelaboratedonnotrepeated.""Alotofstudentshatetobuya45textthattheprofessorhaswritten80onlytohavehislecturesrepeatit./ 44
ForthepasttwoyearsIhavebeenworkingonstudents’evaluationofclassroomteaching.Ihavekeptarecordofinformalconversations36some300studentsforatleasttwenty-onecollegesanduniversities.Thestudentsweregenerallyfrankanddirectintheircomments37howcourseworkcouldbebetterpresented.Mostoftheremarkswerekindly38withtoleranceratherthanbitterness-andfrequentlyweresoftenedbythe39thatthestudentswerespeakingaboutsomenotallinstructors. Neverthelessasthefollowingsuggestionsandcommentsindicatestudentsfeel40withthings-as-they-areintheclassroom. Professorsshouldbediscouragedfromreadinglecturenotes."Itmakestheir41Monotonous单调的.” IftheyaregoingtoreadwhynotgiveoutcopiesofthelectureThenwe42needto43gotoclass.Professorsshouldavoidrepeatinginlecturesmaterialthatisinthetextbook. “44we’vereadthematerialwewantto44itorhearitelaboratedonnotrepeated.""Alotofstudentshatetobuya45textthattheprofessorhaswritten80onlytohavehislecturesrepeatit./ 40
ForthepasttwoyearsIhavebeenworkingonstudents’evaluationofclassroomteaching.Ihavekeptarecordofinformalconversations36some300studentsforatleasttwenty-onecollegesanduniversities.Thestudentsweregenerallyfrankanddirectintheircomments37howcourseworkcouldbebetterpresented.Mostoftheremarkswerekindly38withtoleranceratherthanbitterness-andfrequentlyweresoftenedbythe39thatthestudentswerespeakingaboutsomenotallinstructors. Neverthelessasthefollowingsuggestionsandcommentsindicatestudentsfeel40withthings-as-they-areintheclassroom. Professorsshouldbediscouragedfromreadinglecturenotes."Itmakestheir41Monotonous单调的.” IftheyaregoingtoreadwhynotgiveoutcopiesofthelectureThenwe42needto43gotoclass.Professorsshouldavoidrepeatinginlecturesmaterialthatisinthetextbook. “44we’vereadthematerialwewantto44itorhearitelaboratedonnotrepeated.""Alotofstudentshatetobuya45textthattheprofessorhaswritten80onlytohavehislecturesrepeatit./ 37
——ifhehethatfood.——Luckilyhewassenttothehospitalimmediately.
Thetypicalsymptomsoffluare______dizzyheadacheandcough
Thedaywillcomewhenmallcanmakefulluseofsolarenergy．
Effortstoeducatepeopleabouttherisksofsubslanceabuseseemtodetersomepeoplefromusing-dangeroussubstancesifsucheffortsarerealisticaboutwhatisgenuinelydangerousandwhatisnot.ObserveddeclinesintheuseofsuchdrugsasLSDPCPandQuaaludessincetheearly1970’sareprobablyrelatedtoincreasedawarenessoftherisksoftheiruseandsomeofthis-awarenesswastheresultofwarningsaboutthesedrugsin"underground"papersreadbydrugusers.Suchsourcesareinfluentialbecausetheydonotgiveasimple"alldrugsareterribleforyou"message.Drugusersknowtherearebigvariationsindangeramongdrugsandantidrugeducationthatignoresordeniesthisislikelytoberidiculed.ThisisillustratedbythepopularityamongyoungmarijuanausersofReeferMadnessawidelyunrealisticpropagandafilmagainstmarijuanamadeinthe1930s.Thisfilmmadetheroundsofcollegecampusesinthe1970sandjoinedrock-musicvideosoncabletelevision’sMTVinthe1980s.Insteadofdeterringmarijuanauseitbecameacultfilmamongusersmanyofwhomgothightowatchit. Althoughpersuasioncanworkforsomepeopleifitisbalancedandreasonableotherpeopleseemimmunetothemostreasonededucationaefforts.Millionshavestartedsmokingeventhoughtheconsiderablehealthrisksofsmokinghavebeenwellknownandpublicizedforyears.Moreovertheusefulnessofeducationliesinprimaryprevention:preventionofabuseamongthosewhopresentlyhavenoproblems.HenceBomier’s1978contentionthat"ifthePepsigenerationcanbepersuadedtodrinkpopwinetheycanbepersuadednottodrinkitwhiledriving"isprobablynotcorrectsincemostdrunkendrivingisdonebypeoplewhoalreadyhavesignificantdrinkingproblemsandhenceseemnottobedissuadedevenbymuchstrongermeasuressuchaslossofadriver’slicense. Accordingtothepassageup.tonowantidrugeducation
Scienceandtechnologymodernizedindustryandagriculturewilldeveloprapidly．
Traditionallystate-ownedenterprises______seeastheonlypassagetoemployment.
Hisnewnovelis______concernwithtropicalforest.
Thisdevicelookssimpleenoughbutitisverycomplicated.
Oneofthemostauthoritativevoicesspeakingtoustodayisofcoursethevoiceoftheadvertisers.Itsstridentclamordominatesourlives.Itshoutsatusfromthetelevisionscreenandtheradioloudspeakers;wavestousfromeverypageofthenewspaper;plucksatoursleevesontheIescalator;signalstousfromtheroadsidebillboardsalldayandflashesmessagestousincoloredlightsallnight.Ithasforcedonusawholenewconceptionofthesuccessfulmanasamannolessthan20%ofwhosemailconsistsofannouncementsofgiantcarpetsales. AdvertisinghasbeenamongEngland’sbiggestgrowthindustriessincethewarintermsoftheratioofmoneyearningstodemonstrableachievement.Whyallthisfantasticexpenditure Perhapstheansweristhatadvertisingsavesthemanufacturersfromhavingtothinkaboutthecustomer.AtthestageofdesigninganddevelopingaproductthereisquiteenoughtothinIaboutwithoutworryingoverwhetheranybodywillwanttobuyit.Thedesignerisbusyenoughwithoutaddingcustomer-appealtoallhisotherproblemsofman-hoursandmachinetolerancesandstressfactors.Sotheyjustgoaheadandmadethethingandleaveitlotheadvertisertofindelevenwaysofmakingitappealtopurchasersafi1ertheyhavefinisheditbypretendingthatitconfersstatusorattractsloveorsignifiesmanliness.Iftheadvertisingagencycandothisauthoritativelyenoughthemanufacturerisincover. Othermanufacturersfindadvertisingsavesthemchangingtheirproduct.Andmanufacturershatechange.Theidealproductisonewhichgoesonunchangedforever. Ifthereforeforonereasonoranothersomealterationseemscalledfor-howmuchbettertochangetheimagethepacketorthepitchmadebyproductratherthangotoalltheinconvenienceofchangingtheproductitself. Advertisersareappreciatedbymanufacturersbecausethey
Oneofthemostauthoritativevoicesspeakingtoustodayisofcoursethevoiceoftheadvertisers.Itsstridentclamordominatesourlives.Itshoutsatusfromthetelevisionscreenandtheradioloudspeakers;wavestousfromeverypageofthenewspaper;plucksatoursleevesontheIescalator;signalstousfromtheroadsidebillboardsalldayandflashesmessagestousincoloredlightsallnight.Ithasforcedonusawholenewconceptionofthesuccessfulmanasamannolessthan20%ofwhosemailconsistsofannouncementsofgiantcarpetsales. AdvertisinghasbeenamongEngland’sbiggestgrowthindustriessincethewarintermsoftheratioofmoneyearningstodemonstrableachievement.Whyallthisfantasticexpenditure Perhapstheansweristhatadvertisingsavesthemanufacturersfromhavingtothinkaboutthecustomer.AtthestageofdesigninganddevelopingaproductthereisquiteenoughtothinIaboutwithoutworryingoverwhetheranybodywillwanttobuyit.Thedesignerisbusyenoughwithoutaddingcustomer-appealtoallhisotherproblemsofman-hoursandmachinetolerancesandstressfactors.Sotheyjustgoaheadandmadethethingandleaveitlotheadvertisertofindelevenwaysofmakingitappealtopurchasersafi1ertheyhavefinisheditbypretendingthatitconfersstatusorattractsloveorsignifiesmanliness.Iftheadvertisingagencycandothisauthoritativelyenoughthemanufacturerisincover. Othermanufacturersfindadvertisingsavesthemchangingtheirproduct.Andmanufacturershatechange.Theidealproductisonewhichgoesonunchangedforever. Ifthereforeforonereasonoranothersomealterationseemscalledfor-howmuchbettertochangetheimagethepacketorthepitchmadebyproductratherthangotoalltheinconvenienceofchangingtheproductitself. Thepassagetellsusthatsomemanufacturersinsteadofchangingtheirproductwouldprefer-tochangeits
Therealtroubletheirlackofconfidenceintheirabilities.
ItwaslateintheeveningthatTomreturnedhome.
DuringtheChristmasshoppingrushinLondontheinterestingstorywasreportedofatramp流浪汉whoapparentlythrou9hnofaultofhisownfoundhimselflockedinawell-knownchainstorelateonChristmasEve.Nodoubtthestorewascrowdedwithlast-minuteChristmasshoppers.andthestaffweredeadbeatandlongingtogethome.Allthepropersecuritychecksweremadebeforethestorewaslockedandtheylefttoenjoythethree-dayholidayuntroubledbycustomersdesperatetogetlast-minuteChristmaspresents. Howeverthatmaybeourtrampfoundhimselfaloneinthe.storeanddecidedtomakethebestofit.Therewasfooddrinkbeddingandcampingequipmentofwhichhemadegooduse.Theremustasohavebeen-televisionsetsandradios.Thoughitwasnotreportedifhetookadvantageofthesefacilitieswhentheshopre-openedhewasdiscoveredinbedwithalargenumberofemptybottlesbesidehim.Heseemstohavebeenamanofgoodhumorandphilosophictemperament--asindeedtramps’verycommonlyare.EveryoneelsewasenjoyingChristmassohesawnogoodreasonwhyheshouldnotdothesame.Hesubmittedcheerfullyenoughtobeingtakenawaybythepolice.PerhapshehadhadabetterChristmasthanusual.Hewassentloprisonforsevendays.Thejudgeawardednocompensation赔偿tothechainstoreforthefoodanddrinkourtramphadconsumed.Theyhadinhisopinionalreadyreceivedvaluablefreepublicityfromthecoveragethestoryreceivedinthenewspapersandontelevision. PerhapsthejudgehadhadagoodChristmastoo. Thephrasedeadbeatmostprobablymeans
Daysandnightsareverylongonthemoonwhereonedayisaslongastwoweeksontheearth．
Thespeakerforhersplendidspeecheswaswarmlyreceivedbytheaudience.
Effortstoeducatepeopleabouttherisksofsubslanceabuseseemtodetersomepeoplefromusing-dangeroussubstancesifsucheffortsarerealisticaboutwhatisgenuinelydangerousandwhatisnot.ObserveddeclinesintheuseofsuchdrugsasLSDPCPandQuaaludessincetheearly1970’sareprobablyrelatedtoincreasedawarenessoftherisksoftheiruseandsomeofthis-awarenesswastheresultofwarningsaboutthesedrugsin"underground"papersreadbydrugusers.Suchsourcesareinfluentialbecausetheydonotgiveasimple"alldrugsareterribleforyou"message.Drugusersknowtherearebigvariationsindangeramongdrugsandantidrugeducationthatignoresordeniesthisislikelytoberidiculed.ThisisillustratedbythepopularityamongyoungmarijuanausersofReeferMadnessawidelyunrealisticpropagandafilmagainstmarijuanamadeinthe1930s.Thisfilmmadetheroundsofcollegecampusesinthe1970sandjoinedrock-musicvideosoncabletelevision’sMTVinthe1980s.Insteadofdeterringmarijuanauseitbecameacultfilmamongusersmanyofwhomgothightowatchit. Althoughpersuasioncanworkforsomepeopleifitisbalancedandreasonableotherpeopleseemimmunetothemostreasonededucationaefforts.Millionshavestartedsmokingeventhoughtheconsiderablehealthrisksofsmokinghavebeenwellknownandpublicizedforyears.Moreovertheusefulnessofeducationliesinprimaryprevention:preventionofabuseamongthosewhopresentlyhavenoproblems.HenceBomier’s1978contentionthat"ifthePepsigenerationcanbepersuadedtodrinkpopwinetheycanbepersuadednottodrinkitwhiledriving"isprobablynotcorrectsincemostdrunkendrivingisdonebypeoplewhoalreadyhavesignificantdrinkingproblemsandhenceseemnottobedissuadedevenbymuchstrongermeasuressuchaslossofadriver’slicense. Themessagealldrugsareterribleforyouisnotinfluentialbecause
Itishardtolearnthe______operateofthiscomplicatedmachine.
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