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如图所示，质量m＝1kg的物块，在沿斜面向上、大小F＝15N的拉力作用下，沿倾角θ＝37°的足够长斜面由静止开始匀加速上滑，经时间t1＝2s撤去拉力．已知物块与斜面间的动摩擦因数μ＝0.5，取g＝1...
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高三下学期物理《》真题及答案
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如图所示一质量m=2kg的物块放在一倾角斜面的底端物块与斜面之间的动摩擦因数.现对物块施加一沿斜面向
12分如图所示倾角θ＝37°的斜面固定在水平面上质量m＝0.5kg的小物块受到沿斜面向上的F.＝9.
如图所示质量M=1kg的木板静置于倾角θ=37°足够长的固定光滑斜面底端.质量m=1kg的小物块可视
如图所示位于斜面上的物块m在沿斜面向上的力F.作用下处于静止状态则斜面作用于物块的静摩擦力说法错误的
方向可能沿斜面向上
方向可能沿斜面向下
大小可能等于零
大小一定不等于零
如图质量1kg的小物块受到平行斜面向上的拉力F.沿斜面做匀加速运动其初速度大小为2m/s2s内物块的
如图所示一斜面静止在地面上斜面的倾角为450一质量为1kg的物块沿斜面向上滑动结果地面对斜面的静摩擦
0.2
0.3
0.4
0.5
如图所示斜面体M.放置在水平地面上位于斜面上的物块m受到沿斜面向上的推力F.作用.设物块与斜面之间的
如果物块沿斜面向上滑动，则f1、f2一定增大
如果物块沿斜面向上滑动，则f1、f2一定不变
如果物块与斜面相对静止，则f1、f2一定增大
如果物块与斜面相对静止，则f1、f2一定不变
如图所示斜面体M.放置在水平地面上位于斜面上的物块m受到沿斜面向上的推力F.作用设物块与斜面之间的摩
如果物块沿斜面向上滑动，则F.
1
、F.
2
一定增大
如果物块沿斜面向上滑动，则F.
1
、F.
2
一定不变
如果物块与斜面相对静止，则F.
1
、F.
2
一定增大
如果物块沿斜面相对静止，则F.
1
、F.
2
一定不变
如图所示斜面体M.放置在水平地面上位于斜面上的物块m受到沿斜面向上的推力F.作用.设物块与斜面之间的
如果物块沿斜面向上滑动，则F.1. F2一定不变
如果物块沿斜面向上滑动，则F.1. F2一定增大
如果物块与斜面相对静止，则F.1一定不变
如果物块与斜面相对静止，则F.2一定增大
如图所示斜面倾角为θ木板A的质量为M物块B的质量为m．绳的一端与B连接另一端与固定在斜面上的挡板相连
2008重力大小为W的物块能在倾斜角为α的粗糙斜面上下滑为了维持物块在斜面上平衡在物块上作用向左的水
F只能沿斜面向上
F只能沿斜面向下
F既可能沿斜面向上，也可能向下
F=0
8分如图所示粗糙斜面的倾角为θ一质量为m的物块在平行于斜面向上的拉力F.作用下沿斜面向上做匀速直线运
如图所示倾角θ=37º的斜面固定在水平面上质量m=1.0kg的小物块受到沿斜面向上的F.=9.0N的
某星球半径为R=6×106m假设该星球表面上有一倾角为θ=30°的固定斜面一质量为m=1kg的小物块
如图所示在图a中沿斜面的拉力F.把质量为m的物块A.沿粗糙斜面匀速向上拉改变斜面倾角θ使物块沿斜面向
如图所示在倾角为300的斜面上质量为1kg的物块在沿斜面向上大小为8N.的推力F.作用下沿斜面匀速上
8m/s
2
5m/s
2
1m/s
2
2m/s
2
如图所示倾角θ=37º的斜面固定在水平面上质量m=1.0kg的小物块受到沿斜面向上的F.=9.0N的
如图所示位于斜面上的物块M.在沿斜面向上的力F.作用下处于静止状态则斜面作用于物块的静摩擦力的
方向不可能沿斜面向上
方向不可能沿斜面向下
大小可能等于零
大小可能等于F.
质量为m＝1.0kg的小物块静止在倾角为37°的斜面的底端现对其施一沿斜面向上的力F.力随时间变化的
如图所示倾角θ=37°的粗糙斜面固定在水平面上质量m=2.0kg的物块可视为质点在沿斜面向上的拉力F
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FreedomandResponsibility Freedom'schallengeintheDigitalAgeisaserioustopic.Wearefacingtodayastrangenewworldandweareallwonderingwhatwearegoingtodowithit. Some2500yearsagoGreecediscoveredfreedom.Beforethattherewasnofreedom.Thereweregreatcivilizationssplendidempiresbutnofreedomanywhere.EgyptandBabylonwerebothtyranniesoneverypowerfulmanrulingoverhelplessmasses. InGreeceinAthens雅典alittlecityinalittlecountrytherewerenohelplessmasses.AndAthenianswillinglyobeyedthewrittenlawswhichtheythemselvespassedandtheunwrittenwhichmustbeobeyediffreemenlivetogether.Theymustshoweachotherkindnessandpityandthemanyqualitieswithoutwhichlifewouldbeverypainfulunlessonechosetolivealoneinthedesert.TheAtheniansneverthoughtthatamanwasfreeifhecoulddowhathewanted.Amanwasfreeifhewasself﹣controlled.Tomakeyourselfobeywhatyouapprovedwasfreedom.Theyweresavedfromlookingattheirlivesastheirownprivateaffair.EachonefeltresponsibleforthewelfareofAthensnotbecauseitwasforcedonhimfromtheoutsidebutbecausethecitywashisprideandhissafety.Theessentialbeliefofthefirstfreegovernmentintheworldwaslibertyforallmenwhocouldcontrolthemselvesandwouldtakeresponsibilityforthestate. Butdiscoveringfreedomisnotlikediscoveringcomputers.Itcannotbediscoveredonceforall.Ifpeopledonotprizeitandworkforititwillgo.Constantwatchisitsprice.Athenschanged.Itwasachangethattookplacewithoutbeingnoticedthoughitwasoftheextremeimportanceaspiritualchangewhichaffectedthewholestate.IthadbeentheAtheniansprideandjoytogivetotheircity.Thattheycouldgetmaterialbenefitsfromherneverenteredtheirminds.Therehadtobeacompletechangeofattitudebeforetheycouldlookatthecityasanemployerwhopaidhercitizensfordoingherwork.Nowinsteadofmengivingtothestatethestatewastogivetothem.Whatthepeoplewantedwasagovernmentwhichwouldprovideacomfortablelifeforthemandwiththisastheprimaryobjectideasoffreedomandself﹣relianceandresponsibilitywereneglectedtothepointofdisappearing.Athenswasmoreandmorelookedonasacooperativebusinesspossessedofgreatwealthinwhichallcitizenshadarighttoshare. Athensreachedthepointwhenthefreedomshereallywantedwasfreedomfromresponsibility.Therecouldbeonlyoneresult.Ifmeninsistedonbeingfreefromtheburdenofself﹣dependenceandresponsibilityforthecommongoodtheywouldceasetobefree.Responsibilityisthepriceeverymanmustpayforfreedom.Itistobehadonnootherterms.AthenstheAthensofAncientGreecerefusedresponsibilityshereachedtheendoffreedomandwasnevertohaveitagain. ButtheexcellentbecomesthepermanentAristotlesaid.Athenslostfreedomforeverbutfreedomwasnotlostforeverfortheworld.AgreatAmericanJamesMadisonreferredtoThecapacity能力ofmankindforself﹣government.NodoubthehadnotanideathathewasspeakingGreek.Athenswasnotinthefarthestbackgroundofhismindbutoncemanhasagreatandgoodideaitisnevercompletelylost.TheDigitalAgecannotdestroyit.Somehowinthisorthatman'sthoughtsuchanidealivesthoughunconsideredbytheworldofaction.Onecanneverbesurethatitisnotonthepointofbreakingoutintoactiononlysurethatitwilldososometime. 65.WhatdoestheunderlinedwordtyranniesinParagraph2referto? A.Countrieswheretheirpeopleneedhelp. B.Powerfulstateswithhighercivilization. C.Splendidempireswherepeopleenjoyfreedom. D.Governmentsruledwithabsolutepower. 66.Peoplebelievinginfreedomarethosewho. A.regardtheirlifeastheirownbusiness B.seekgainsastheirprimaryobject C.behavewithinthelawsandvaluesystems D.treatotherswithkindnessandpity 67.WhatchangeinattitudetookplaceinAthens? A.TheAtheniansrefusedtotaketheirresponsibility. B.TheAtheniansnolongertookprideinthecity. C.TheAtheniansbenefitedspirituallyfromthegovernment. D.TheAthenianslookedonthegovernmentasabusiness. 68.WhatdoesthesentenceTherecouldbeonlyoneresult.inParagraph5mean? A.Athenswouldcontinuetobefree. B.Athenswouldceasetohavefreedom. C.Freedomwouldcomefromresponsibility. D.FreedomwouldstopAthensfromself﹣dependence. 69.WhydoestheauthorrefertoAristotleandMadison? A.Theauthorishopefulaboutfreedom. B.Theauthoriscautiousaboutself﹣government. C.TheauthorisskepticalofGreekcivilization. D.Theauthorisproudofman'scapacity. 70.Whatistheauthor'sunderstandingoffreedom? A.Freedomcanbemorepopularinthedigitalage. B.Freedommaycometoanendinthedigitalage. C.Freedomshouldhavepriorityoverresponsibility. D.Freedomneedstobeguaranteedbyresponsibility.
下列推理不正确的是 ①同种分子构成的物质一定属于纯净物 ②只含一种元素的物质一定是单质 ③质子数相同的微粒一定是同种元素 ④含有氧元素的化合物一定是氧化物 ⑤最外层电子数相等的原子化学性质一定相似 ⑥化学反应前后原子的个数和种类一定不改变 ⑦同种物质中同种元素一定显相同价态．
某工厂制取漂白液的化学原理为Cl2+2NaOH═NaClO+NaCl+H2O在该反应中氯元素没有呈现出的化合价是
下列化学实验操作不符合规范的是
AskhelpfulHannah DearhelpfulHannah I'vegotaproblemwithmyhusbandSam.HeboughtasmartphoneacoupleofmonthsagoandhetookitonourrecentskivacationtoColoradoitwasagreattripexceptforoneproblem.Hehasaconstanturge33checkfornextmessageshecheckshisphoneeveryfiveminutes!He'ssoaddictedtoitthathejustcan'tstandtheidea34theremaybeanimportanttext.Hecan'thelpcheckingevenatinappropriatetimeslikewhenweareeatinginarestaurantandIamtalkingtohim!Hebehaves35anysmallamountofboredomcanmakehimfeeltheneedtocheckhisphoneevenwhenheknowheshouldn't.Thetemptationtosee36isconnectinghimisjusttoogreat.WhenIaskhimtoputdownthephoneandstop37ignoremehesayInaminute.butstillcheckstoseeif38haspostedsomethingnewontheInternet.Ourlife39interrupt.IfwegosomewhereandIaskhimtohavethephoneathomehesuffersfromwithdrawalsymptom.Maythisdependencyonhissmartphonehasbecomemorethananeverydayproblem. Irecentlyreadanarticleaboutnomophobia40isarealillnesspeoplecan'tsufferfromthefearofbeingwithoutyourphone!IamworriedthatSammaybesufferingfromthisillnessbecausehefeelsanxiousifhedoesn'thavehisphonewithhimevenforashorttime. Whowouldhavethoughtthatlittledeviceslikethesecouldhavebroughtsomuchtrouble! SickandTiredSadie. 33. 34. 35. 36. 37. 38. 39. 40.
学校即将举办读书节目前正广泛征集读书节宣传册图片.假设你是该校学生潘阳你已找到以下三幅图片决定给读书节组委会写一封信推荐其中一幅你的信须包括以下内容 1.简单描述你想推荐的那幅图片 2.阐述你用这幅图片宣传读书节的理由.
化学世界绚丽多彩下列实验中有关颜色的描述正确的是
Ifyoustudiedpicturesthatancientpeopleleftonrockwallsandyoutriedtodeterminetheirmeaningyouwouldnotdetectinterestinromanceamongtheartists.51youwouldseeplentyofanimalswithpeoplerunningafterthem.Lifeforancientpeople'searnedtocenteronhuntingandgatheringwildfoodsformeals. Inmoderntimeswhenfoodisavailableingrocerystoresfindingloveismore52inpeople'slives.The53isallaroundus.Itiseasytopreparealistofmodernstorieshavingtodowithlove.Anendlessnumberofbooksandmoviesqualifyaslovestoriesinpopularculture. Researchersarestudyingwhetherloveahighlyvaluedemotionalstatecanbe54.Theyaskwhatislove?Toothpastecompanieswantustothinkattractionisallaboutcleanteethbutcleanteethgoonlysofar.Scientistswonderhowmuchthebraingetsinvolved.Youhaveprobablyheardthatoppositesattractbutthat55attracttoo.OnethingiscertainThetruthaboutloveisnotyetsetinstone. FirstImpression Tohelpdeterminethe56ofattractionresearcherspaired164collegeclassmatesandhadthemtalkfor36or10minutessotheycouldgetasenseofeachother'sindividuality.Thenstudentswereaskedto57whatkindofrelationshiptheywerelikelytobuildwiththeirpartners.Afternineweekstheyreportedwhathappened. Asitturnedouttheir58judgementsoftenheldtrue.Studentsseemedto59atanearlystagewhowouldbestfitintotheirlives. The60Knows Scientistshavealsoturnedtononhumanstoincreaseunderstandingofattraction.Manyanimalsgiveoffpheromones﹣naturalchemicalsthatcanbedetectedbyandthencanproducearesponseinotheranimalsofthesamespecies.Pheromonescansignalthatananimaliseitherreadytofightorisfeeling61topartnerships.Incontrasthumansdonotseemtobeas62asotheranimalsatdetectingsuchchemicals.Smellhoweverdoesseemtoplayapartinhumanattraction.Althoughwemaynotbeawareofchemicalslikepheromonesconsciouslywegiveandreceiveloadsofinformationthroughsmellineveryinteractionwithotherpeople. FaceValue Beingfondofsomeoneseemstohaveanumberoffactorsincludingseeingsomethingwefindattractive.Researchershadpeoplejudgefacesfor63.Theparticipantshad0.013secondstovieweachfaceyetsomehowtheygenerallyconsideredtheimagesthesameaspeoplewhohadmoretimetostudythesamefaces.Thewaywe64attractivenessseemtobesomewhatautomatic. Whenshownanattractivefaceandthenwordswithgoodorbadassociationspeoplerespondedto65wordsfasterafterviewinganattractiveface.Seeingsomethingattractiveseemstocausehappythinking. 51.A.Instead B.Therefore C.Moreover D.Otherwise 52.A.romantic B.stressful C.central D.beneficial 53.A.priority B.proof C.possibility D.principle 54.A.tested B.imposed C.changed D.created 55.A.appearances B.virtues C.similarities D.passions 56.A.illustrations B.imaginations C.ingredients D.instructions 57.A.predict B.investigate C.diagnose D.recall 58.A.critical B.initial C.random D.mature 59.A.memorize B.distinguish C.negotiate D.question 60.A.Nose B.Eye C.Heart D.Hand 61.A.open B.alert C.resistant D.superior 62.A.disappointed B.amazed C.confused D.gifted 63.A.emotion B.attractiveness C.individuality D.signals 64.A.enhance B.possess C.maintain D.assess 65.A.familiar B.plain C.positive D.insulting.
元素周期表是学习和研究化学的重要工具．如图是元素周期表的一部分A﹣F代表六种不同元素．下列说法不正确的是
70.InthefilmreviewwhatisparagraphAmainlyabout?. A.Theintroductiontotheleadingroles B.Thewriter'sopinionofacting C.Thewriter'scommentsonthestory D.Thebackgroundinformation 71.AccordingtothefilmreviewmonsterparagraphBrefersto. A.agun﹣crazyhunter B.abrainydog C.ascaryrabbit D.agiantvegetable 72.Whichofthefollowingisareasonwhythewriterrecommendsthefilm? A.It'sfullofwitandhumour. B.Itscharactersshowfeelingswithoutwords. C.ItisanadventurefilmdirectedbyPeterSallis. D.Itisabouttheharmonybetweenmanandanimals.
IwasrequiredtoreadoneofBernieSiegel'sbooksincollegeandwashookedonhispositivityfromthatmomenton.Thestoriesofhisunconventional36andtheexceptionalpatientshewroteaboutwereso37tomeandhadsuchabig38onhowIsawlifefromthenon.WhoknewthatsomanyyearslaterIwouldlooktoDr.BernieandhisCDsagainto39myowncancerexperience? I'manambitious40andwhenIstartedgoingthroughchemo化疗eventhoughI'mavery41personIlostmydrivetowrite.Iwasjusttootiredandnotinthe42.Onedaywhilewaitingtogoinfor43IhadoneofDr.Bernie'sbooksinmyhand.Anotherpatient44whatIwasreadingandstruckupaconversationwithme45hehadoneofhisbookswithhimaswell.It46thatamongotherthingshewasaneighty﹣year﹣oldwriter.Hewas47apublishedauthorandhewascurrently48onanewbook. Wewouldseeeachotheratvarioustimesand49friends.SometimesheworeaduckhatandIwouldtellmyselfhewasdefinitelyan50ofDr.Bernie.Hereallyputa51onmyface.Heunfortunately52lastyearduetohiscancer53heleftadeepimpressiononmeandgavemethe54topickupmypenagain.I55tomyselfIfhecandoitthensocanI. 36.A.tastes B.ideas C.notes D.memories 37.A.amazing B.shocking C.amusing D.strange 38.A.strike B.push C.challenge D.impact 39.A.learnfrom B.goover C.getthrough D.referto 40.A.reader B.writer C.editor D.doctor 41.A.positive B.agreeable C.humorous D.honest 42.A.mood B.position C.state D.way 43.A.advice B.reference C.protection D.treatment 44.A.viewed B.knew C.noticed D.wondered 45.A.while B.because C.although D.providing 46.A.cameout B.workedout C.provedout D.turnedout 47.A.naturally B.merely C.hopefully D.actually 48.A.deciding B.investing C.working D.relying 49.A.became B.helped C.missed D.visited 50.A.patient B.operator C.fan D.publisher 51.A.sign B.smile C.mark D.mask 52.A.showedup B.setoff C.felldown D.passedaway 53.A.since B.but C.so D.for 54.A.guidance B.trust C.opportunity D.inspiration 55.A.promised B.swore C.thought D.replied
Someschoolswillhavetomakeinagreementwiththenationalsoccerreform. A.judgments B.adjustments C.comments D.achievements
请阅读下面文字及图表并按照要求用英语写一篇150词左右的文章. [写作内容] 1.用约30个单词概述上述信息的主要内容 2.结合上述信息简要分析导致交通问题的主要原因 3.根据你的分析从社会规范rulesandregulations和个人行为两方面谈谈你得到的启示不 少于两点. [写作要求] 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题. [评分标准] 内容完整语言规范语篇连贯词数适当.
下列有关分子与原子的说法不正确的是
如图甲是电解水的简易装置试回答下列问题． 1负极产生的气体是填化学式电解水的符号表达式为 2电解水的过程中通常会加入硫酸钠目的是 3以下关于该实验的说法中不正确的有填字母序号 A．水是由水分子构成 B正极和负极产生的气体质量比是21 C水是由两个氢元素和一个氧元素组成 D．通电时能产生氧气和氢气是因为水分子中含有氧分子和氢分子 4改进后的装置乙比装置甲有一个明显的优点这个优点是在D口用燃着的木条检验气体的现象是．
这个游戏的独特之处在于它让孩子学会如何应对现实生活中的问题.whatWhatmakesthegameuniqueisthatithelpschildrenlearnhowtocopewith problemsinreallife..
IntheUnitedStatesaloneover100millioncell﹣phonesarethrownawayeachyear.Cell﹣phonesarepartofagrowingmountainofelectronicwastelikecomputersandpersonaldigitalassistants.Theelectronicwastestreamisincreasingthreetimesfasterthantraditionalgarbageasawhole. Electronicdevicescontainvaluablemetalssuchasgoldandsilver.ASwissstudyreportedthatwhiletheweightofelectronicgoodsrepresentedbypreciousmetalswasrelativelysmallincomparisontototalwastetheconcentration含量ofgoldandotherpreciousmetalswashigherinSo﹣callede﹣wastethaninnaturallyoccurringminerals. Electronicwastesalsocontainmanypoisonousmetals.Evenwhenthemachinesarerecycledandtheharmfulmetalsremovedtherecyclingprocessofteniscarriedoutinpoorcountriesinpracticallyuncontrolledwayswhichallowmanypoisonoussubstancestoescapeintotheenvironment. Creatingproductsoutofrawmaterialscreatesmuchmorewastematerialupto100timesmorethanthematerialcontainedinthefinishedproducts.Consideragainthecell﹣phoneandimaginetheminesthatproducedthosemetalsthefactoriesneededtomaketheboxandpackaging包装itcamein.Manywastesproducedintheproducingprocessareharmfulaswell. TheU.S.EnvironmentalProtectionAgencynotesthatmostwasteisdangerousinthattheproductiondistributionanduseofproducts﹣aswellasmanagementoftheresultingwaste﹣allresultingreenhousegasrelease.Individualscanreducetheircontributionbycreatinglesswasteatthestart﹣forinstancebuyingreusableproductsandrecycling. Inmanycountriestheconceptofextendedproducerresponsibilityisbeingconsideredorhasbeenputinplaceasanincentive动机forreducingwaste.Ifproducersarerequiredtotakebackpackagingtheyusetoselltheirproductswouldtheyreducethepackaginginthefirstplace? Governments'incentivetorequireproducerstotakeresponsibilityforthepackagingtheyproduceisusuallybasedonmoney.Whytheyaskshouldcitiesortownsberesponsibleforpayingtodealwiththebubblewrap气泡垫thatencasedyourtelevision? Fromthegovernments'pointofviewaprimarygoaloflawsrequiringextendedproducerresponsibilityistotransferboththecostsandthephysicalresponsibilityofwastemanagementfromthegovernmentandtax﹣payersbacktotheproducers. 58.BymentioningtheSwissstudytheauthorintendstotellusthat. A.theweightofe﹣goodsisrathersmall B.E﹣wastedeservestobemadegooduseof C.naturalmineralscontainmorepreciousmetals D.thepercentageofpreciousmetalsisheavyine﹣waste 59.Theresponsibilityofe﹣wastetreatmentshouldbeextended. A.fromproducerstogovernments B.fromgovernmentstoproducers C.fromindividualstodistributors D.fromdistributorstogovernments 60.Whatdoesthepassagemainlytalkabout? A.Theincreaseine﹣waste. B.Thecreationofe﹣waste. C.Theseriousnessofe﹣waste. D.Themanagementofe﹣waste.
在一定条件下一个密闭容器内发生某反应测得反应前后各物质的质量如下表所示．下列有关说法不正确的是
Muchtimesittingatadeskofficeworkersaregenerallytroubledbyhealthproblems. A.beingspent B.havingspent C.spent D.spending
每100g黑木耳中含铁0.185g是常见天然食品中最高的这里的“铁”应理解为
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ManyofthethingswenowbenefitfromwouldnotbearoundThomasEdison. A.thanksto B.regardlessof C.asidefrom D.butfor
我国自主研发的抗癌新药“西达本胺”已全球上市西达本胺的化学式为C22H19FN4O2下列关于西达本胺的说法正确的是
镓是一种放在手心就会熔化的金属图①是镓元素在元素周期表中的信息图②是镓原子的结构示意图请回答 1镓原子位于元素周期表中第周期 2ABC三种微粒所属元素中与镓元素化学性质相似的是填“A”“B”或“C”则镓离子与B粒子形成的化合物的化学式为 3镓和C形成的化合物是由“分子”“原子”或“离子”直接构成 4D为某粒子的结构示意图其中当x﹣y＝8时该粒子的符号为．
Itmighthavesavedmesometroubletheschedule. A.didIknow B.haveIknown C.doIknow D.hadIknown
Youthsporthasthepotentialtoaccomplishthreeimportantobjectivesinchildren'sdevelopment.Firstsportprogramscanprovideyouthwithopportunitiestobephysicallyactivewhichcanleadtoimprovedphysicalhealth.Secondyouthsportprogramshavelongbeenconsideredimportanttoyouth'spsychosocialdevelopmentprovidingopportunitiestolearnimportantlifeskillssuchascooperationdisciplineleadershipandself﹣control.Thirdyouthsportprogramsarecriticalforthelearningofmotorskillsthesemotorskillsserveasafoundationforfuturenationalsportstarsandrecreationaladultsportparticipants.Whencoachersdevelopactivitiesforyouthpracticesandwhensportorganizationsdesignyouth﹣sportprogramstheymustconsidertheimplicationofdeliberateplayanddeliberatepractice. ResearchfromTelama2006statesthatregularparticipationindeliberateplayordeliberatepracticeactivitiesduringchildhoodandyouthagesninetoeighteenincreasesthelikelihoodofparticipationinsportsduringadulthoodbysixtimesforbothmalesandfemales.Côté2002definesdeliberateplayactivitiesinsportasthosedesignedtomaximizeenjoyment.Theseactivitiesareregulatedbyflexiblerulesadaptedfromstandardizedsportrulesandaresetupbythechildrenorbyaninvolvedadult.Childrentypicallychangerulestofindapointwheretheirgameissimilartotheactualsportbutstillallowsforplayattheirlevel.Forexamplechildrenmaychangesoccerandbasketballrulestosuittheirneedsandenvironmente.g.inthestreet.onaplayingfieldorinsomeone'sbackyard.Wheninvolvedindeliberateplayactivitieschildrenarelessconcernedwiththeoutcomeoftheiroutcomeoftheirbehavior.whethertheywinorlosethanwiththebehavior.havingfun. OntheotherhandEricsson1993suggeststhatthemosteffectivelearningoccursthroughinvolvementinhighlystructuredactivitiesdefinedasdeliberatepractice.Deliberatepracticeactivitiesrequireeffortproducenoimmediaterewardsandaremotivatedbythegoalofimprovingperformanceratherthanthegoalofenjoyment.Whenindividualsareinvolvedindeliberateplaytheyexperimentwithdifferentcombinationsofbehaviorsbutnotnecessarilyinthemosteffectivewaytoimproveperformance.Incontrastwhenindividualsareinvolvedindeliberatepracticetheyexhibitbehavior.focusedonimprovingperformancebythemosteffectivemeansavailable.Forexamplethebackhandskillsintenniscouldbelearnedandimprovedovertimebyplayingmatchesorbycreatingfunpracticesituations.Howeverplayerscouldmoreeffectivelyimprovetheirbackhandperformancebypracticingdrillsthatmightbeconsideredlessenjoyable.Althoughdrillsareusedinmosteffectivemeansavailablepracticemightnotbethemostenjoyabletheymightbethemostrelevanttoimprovingperformance. NoteAnswerthequestionsorcompletethestatementsinNOMORETHANTENWORDS 78.Besidesthelearningofmotorskillswhataretheothertwoimportantobjectivesofyouthsport?. 79.Ifchildrenparticipateindeliberateplayordeliberatepracticeactivitiestheyaremorelikelyto. 80.Indeliberateplayactivitieswhatdochildrendotomaximizeenjoyment?. 81.Incontrasttodeliberateplaydeliberatepracticeisaimedat.
Itissocoldthatyoucan'tgooutsidefullycoveredinthickclothes. A.if B.unless C.once D.when
Therealreasonwhypricesandstillaretoohighiscomplexandnoshortdiscussioncansatisfactorilyexplainthisproblem. A.Were B.willbe C.havebeen D.hadbeen
加压或降温可将氧气变成液氧下列说法正确的是
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