首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
如图是一个纸盒、两支笔和四根宽窄不同的橡皮筋制作的“橡皮筋吉他”．拨动a、b、c、d四根橡皮筋， 音调最高．用大小不同的力拨动同一根橡皮筋，橡皮筋发声的 不同．
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
如图2-1是用一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他．拨动abcd四根橡皮筋的音调最高
小赵用宽窄不同的橡皮筋制成了一个橡皮筋吉他．当他用相同的力拨动不同的橡皮筋时会发出跟吉他一样的声音此
2.00分如图是一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他．拨动abcd四根橡皮筋音调最
如图所示把宽窄不同的橡皮筋缠到一个小盒罐上小盒罐的两端各放一支笔绷紧橡皮筋就制成了一个橡皮筋吉他用相
图1是用一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他拨动abcd四根橡皮筋_________
如图是用一个纸盒两支笔和四根宽窄不同的橡皮筋制成的橡皮筋吉他abcd四根橡皮筋的宽度为逐渐变宽．拨动
如图是一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他．拨动abcd四根橡皮筋音调最高．用大小
图2-2-10是用一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他．拨动abcd四根橡皮筋的音调
如图是小岩自制的小乐器他将宽窄不同的橡皮筋缠到一个小盒上又在小盒的两端各放一支笔用来拉紧橡皮筋弹拨
如图所示小明用宽窄不同的橡皮筋制成了一个橡皮筋吉他当他用相同的力拨动不同的橡皮筋时会发出跟吉他一样的
如图是用一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他．拨动abcd四根橡皮筋的音调最高用大小
如图是用一个纸盒两根木条和abcd四根依次变粗的橡皮筋制作的橡皮筋吉他．拨动四根橡皮筋音调最低的是
a
b
c
d
如上图右所示小赵用宽窄不同的橡皮筋制成了一个橡皮筋吉他当他用相同的力拨动不同的橡皮筋时会发出跟吉他一
如图是一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他拨动abcd四根橡皮筋音调最高用大小不同
如上图右所示小赵用宽窄不同的橡皮筋制成了一个橡皮筋吉他当他用相同的力拨动不同的橡皮筋时会发出跟吉他一
如图是一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他．拨动abcd四根橡皮筋音调最高．用大小
河南中考如图是用一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他.拨动abcd四根橡皮筋____
小明用4根粗细相同的橡皮筋四个砝码一个纸盒两根木条制成一个橡胶皮筋吉他．橡皮筋一端固定另一端悬挂不
20g
40g
60g
80g
如图所示小赵用宽窄不同的橡皮筋制成了一个橡皮筋吉他当他用相同的力拨动不同的橡皮筋时会发出跟吉他一样的
2014·河南中考如图8是用一个纸盒两支笔和四根宽窄不同的橡皮筋制作的橡皮筋吉他拨动四根橡皮筋的音调
热门试题
更多
2分在这么短的时间内看完一篇5000字的报告是几乎不可能的.cover.
8分ChildrenneedriskyplaylikeclimbingandjumpingfromaheightplayingwithknivesorplayingnearwaterorcliffssaysastudyreportonactiveoutdoorplayintheJournalofEnvironmentalResearchandPublicHealth.Itaddsthatchildrenwhodosoimprovetheirreactiontimeindetectingriskincreasetheirself﹣confidenceandarelesslikelytotakesrisksrelatedtosexanddrugsasadolescents. TheUSstudyfoundthatwhile86%ofchildrenbetweentheagesof7and11wenttoschoolwithoutanadultinthe1970sthisfellt025%in2015.81%ofparentsof10﹣to﹣12﹣year﹣oldswereworriedaboutstrangerdangeryetresearcherspointoutthatthechancesofabduction诱拐byatotalstrangerareoneinamillion.Seriousrisksfromplaygroundsi.e.chokedbyequipmentwhenparksusedtohaveropeshavelargelybeenremoved.AlargeNewZealandstudyofnearly31000childrenreportednoheadinjuryfromplaygroundsin2015.Brokenbonesmostlyinupperarmdohappenbutarerare﹣theUSstudyreportsanaverageof3injuriesper10000hoursofplaylastyear.Parentshavetohaveabalancedviewofthis.Theirchildathomeis500timesmorelikelytomeetastranger﹣theInternetactuallyhasmanycyber﹣bullies. MarkTremblaytheauthorofthestudyreportbelievesthatchildrenwon'tdevelopadaptabilitywithoutgettingalittlehurtandgettingbackupagain.Theevidencesuggeststhatchildrenself﹣regulateinplayinresponsetorisks.Anunmovinglifestylemightstopthemdislocatingshouldersbutleadstoobesityandotherdiseasesinlaterlife.playingunsupervisedoutsideleadstobetterself﹣regulationandpsychologicalhealth. There'sevenatermforoverprotectedkids:riskshortagedisorder.Tremblaysuggestsparentstrainthemselvesbyfirstlettingtheirchildrengooffontheirownfor20minuteshavingmadesuretheyknowhowtocrosstheroad. 1Whichofthefollowingisprobablyariskyplay? A.Playingintheneighborhoodsupervised B.Readingadventurousstoriesonthebus. C.Cyclingfastdownfromthetopofahill. D.Takingpartinanonlinerole﹣playgame. 2FromMarkTremblay'sreportweknowthat A.mostparentsofkidsbetween10and12worriedtoomuch B.aquarterofchildrenintheUSnowattendschoolalone C.headinjuryistheprimarycauseforchildrentogethurt D.only3in10000USchildrenbroketheirbonesin2015 3Researchersbelievethatchildrenneedriskyplaybecause A.parentswilllearntobalancetheirviewstowardssafetyandrisk B:achildplayingaloneislesslikelytobetakenawaybyastranger C.itsaveschildrenfromdiseasessuchasriskshortagedisorder D.itwilldomuchgoodforchildrenbothmentallyandphysically 4Whatwouldbethebesttitleforthetext? A.ChildrenAreOverprotected. B.RiskyPlaysAreNecessary. C.PlaygroundsAreRiskless. D.OutdoorActivitiesBenefitChildren.
根据如图所示装置回答有关问题 1若用装置B排水收集氧气气体从填“a”或“b”导管能入瓶内瓶底留少量水进行装置C中的实验水的作用是． 2对比装置D和C可以得出关于可燃物燃烧的条件是 3某同学连接AEF进行实验A中所加药品不同F中所加药品相同． ①若实验时E中蜡烛熄灭F中溶液变浑浊则A中反应的化学方程为 ②若实验时E中蜡烛燃烧更旺F中溶液变浑浊则A中反应的化学方程式为．
下列对各种材料的开发利用过程中主要过程属于化学变化的是
为达到实验目的下列实验方案或结论不正确的是
下列图象能正确反映对应变化的是
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处每处错误仅涉及一个单词的增加删除或修改.增加:把缺词处加个漏字符号并在其下面写出该加的词.删除:把多余的词用斜线\划掉.修改:在错的词下划一横线并在该词下面写出修改后的词.注意:1.每处错误及其修改均仅限一词;2.只允许修改10处多者从第11处起不计分.StudentsinAmericanschoolslearnfromanearlyagetogivepresentationsaspartoftheirregularlyclassroomactivities.Childrenasyoungasfiveyearsoldoftengivebrieftalkswithobjectstheybringintoschoolcalling'showandtell'.Thistrainisabasisforlaterpublicspeaking.EvensomanynativeEnglish﹣speakingadultsareafraidspeakorgivepresentationsinthefrontofalargegroup.Fortunatelymoderntechnologymustbeanimportanttoolinimprovingpublicspeaking.Manystudentsnowhaveaphoneordevicethatcantakevideo.Studentscanwatchthemselvesandseewhattheyappeartohisaudience.TheycanalsowatchmodelsofgoodspeechesontheInternetandlearnfromtheexperts.
垃圾分类从你我他开始．废弃塑料瓶属于
下列实验操作中正确的是
有甲乙丙三种金属如果将甲乙丙分别投入到CuSO4溶液中一段时间后甲丙表面出现红色物质乙没有明显现象再将大小相同的甲丙分别放到相同的盐酸中甲丙均产生气泡但甲产生气泡的速度明显快于丙则甲乙丙三种金属的活动性顺序是
根据如图的微粒结构示意图所获取信息不正确的是
2分在给女儿的信中扎克伯格Zuckerberg宣布他和他的妻子将把99%的公司股份捐给公益事业.announcement.
图中是钠元素在元素周期表中的信息和钠原子结构示意图．下列说法错误的是
南京青奥会火炬使用的燃料为A物质纯净物A在B物质中充分燃烧发生反应为A+5B3C+4D部分微观示意图如图所示． 1上述反应中A物质的化学式为． 2反应过程中A物质与B物质的质量比为．
30分Directions:WriteanEnglishcompositionin120﹣150wordsaccordingtothepictureandtheinstructionsgivenbelow. 1简要描述图片; 2就图片呈现的现象谈谈你的看法.
2015年10月．我国科学家屠呦呦因发现青蒿素化学式为C15H22O5而获得诺贝尔奖．青蒿素在加热条件下易分解．下列有关说法错误的是
8分Hellformostofusyesbutallinaday'sworkforCharlotteUhlenbroek.ShemovesaselegantlythroughthehallofLondon'sSavoyasshedoesthroughtheAmazonjungle.Butwhileshelovestheadventuresheisalsogladtobebackincivilizationatleastforthemoment.She'sjustfinishedfilmingaTVseriescalledjungle﹣ademanding19﹣weekjobthatinvolvedherexploringthedensejunglesoftheCongotheAmazonandBorneo.Shesaysthatitwasfascinatingbutdauntingaswell.Sowhatwashermostchallengingexperience?Definitelyclimbingan80﹣meter﹣hightreeinBorneowhenI'mscaredofheights!IhadtokeepgoingupandupwhenavoiceinsidemewassayingDown!Down!Ikeptthinkingtheropesweregoingtobreakandsendmeplummetingdownbelow.Anddownbelowwaswherethebugswere.ApartfromtheusualmosquitoesintheAmazonrainforestshewastroubledbysand﹣flybites.I'vehadsomehorriblebitesbutthesereallyaretheitchiest最痒的bitesI'veeverhad.AtonestageIcounted70bitesononearmshesays.JustasannoyingwerethesweatbeesintheCongo.Theytrytodrinkthesweatonyourfaceandeventhetearsfromyoureyes.Themosthorriblethingthoughwastryingtopulltheslimyleeches水蛭offyourskin.ThemoreIpulledthemoretheystretchedandthetightertheirjawsclungtomyleg.IkeptshoutingGetthemoff!andthefilmcrewkeptsayingJustaminutethismakesareallygoodshot!Charlotte'sjourneyintotheheartoftheworld'smostsignificantrainforestswasaninspiringexperience.Therainforestreallyislikeacity.Eachtreeislikeanurbanhighrisebuildingwithhundredsofresidents.Ifyouknockitdownyoucausejustasmuchdisturbanceanddamageasifthoseresidentswerehuman.Thejungleisextraordinarybecausealthoughitonlycoversabout6percentoftheworlditcontainsover50percentofallknownanimalandplantspeciespluslotsmorethatareunknowntoo.BackinLondonwhathasshebeenenjoyingsinceherreturntocivilization?I'vebeenhavinglotsofnicelongshowersshesays.IntheCongothepossibilityofusingupourwatersupplieswasalwaysaworryingthought.AndIfindthatwhenI'vebeeninhotuncomfortableconditionsforawhilethethingsIlookforwardtomorethananythingelsearebeingwithmyfamilyandenjoyingmyfavoritemeal.66.Theunderlinedworddauntinginparagraph2isclosestinmeaningto.A.frighteningB.excitingC.encouragingD.satisfying67.Whenbittenbyapersonwillfeelunbearablyitchy.A.usualmosquitoesB.sandfliesC.sweatbeesD.leeches68.Atreeintherainforestiscomparedtoahighrisebuildingbecause.A.manypeoplecometoexplorethejungleB.thetreesare80metreshighonaverageC.manytreeshavebeenknockeddownD.therearesomanylivingthingsinit69.WhichofthefollowingstatementsisTRUE?A.ThefilmcrewgaveCharlotteashottopreventinfection.B.CharlottelooksandfeelsoutofplaceintheSavoyHotel.C.WatersupplywasalwaysabigconcernforCharlotteinthejungle.D.Thejunglecontainshalfofalltheanimalandplantspeciesintheworld.
能源问题是困扰人类可持续发展的一个重要因素．能源的开采开发储存和综合利用是目前世界各国科学家研究的重大课题． 1人类目前使用的化石燃料有煤天然气和． 2天然气是常见的清洁燃料写出其燃烧的化学方程式．
30分JeniferinvitedMrJohnsontodinner.Lasttermshehadbeenastudentinhisgrammarclassbutasasinglemothershehadto1itbecausehersonMacwashavinga2inschool﹣hewasn'tstudying.JeruferdecidedthatMacneededmore3whichshethoughtMrJohnsoncouldprovided.SheherselfwouldwatchMaccloselyand4hisuseoftheGameBoytoonlyweekends.MrJohnsonhadbeenteachingforalmost40years.Hecouldhave510yearsagobuthelovedteaching.He6toteachuntilhedroppeddeadintheclassroom.MrJohnsonneededtotakealittlegifttoJenifertoshowhis7fortheinvitation.Hecouldn'tthinkofwhatwouldbe8.Openinghiskitchencupboardhefoundtheperfectgift﹣anunopenedboxof9andsomefresh﹣lookingwrapping包装paperaswell.He10theboxupexpertly.Feeling11ofhimselfhedroveovertoJerufer'sandrangthedoorbell.He12hisgift.Jenifermadeafunnyface.Thensheunwrappedtheteaandmade13SirIgavethis.teatoyouattheendoflast14andlwrappeditinthis15paper!Johnson'sfaceturnedred.Hetoldhimselftobemore16whenpreparinggiftsinthefuture.HeapologizedtoJenifer.SmilingshesaidIt'sOK.It'sthethoughtthat17yes?Jenifer'sconsiderateness18MrJohnsonfromfurtherembarrassment.Where'sMac?heaskeddeterminedtohelpthis19boybacktotherightway.20loveandhelpbetweenthreegenerationswasmorevaluablethananyothergift.1A.continue B.drop C.enter D.register2A.suffering B.hardship C.problem D.disease3A.motivation B.imagination C.entertainment D.comfort4A.allow B.forbid C.promote D.restrict'5A.retired B.resisted C.remained D.removed6A.hesitated B.needed C.determined D.agreed7A.attitude B.warmth C.welcome D.thanks8A.expensive B.suitable C.instructive D.effective9A.chocolate B.coffee C.tea D.sugar10A.picked B.covered C.cleared D.wrapped11A.ashamed B.proud C.afraid D.certain12A.presented B.treasured 'C.brought D.opened13A.another B.other C.one D.it14A.decade B.term C.time D.period15A.similar B.wonderful C.pretty D.very16A.particular B.successful C.careful D.skillful17A.depends B.tells C.judges D.counts18A.comforted B.took C.relieved D.separated19A.naughty B.selfish C.diligent D.handsome20A.Inall B.Afterall C.Atall D.Forall
10分A.approvalB.invadersC.addressedD.servingE.impactF.responseG.influentialH.rescuedI.mixedJ.potentialK.engagedTheGermanChancellorAngelaMerkelhasbeennamedTIME's2015PersonoftheYear.She'sledGermanysince2005andis41herthirdtime.TIMEhasnamedapersonofayearsince1927.Therecipientissomeoneorsomegroupthatforbetterorworseisconsideredtohavehadamajor42onworldevents.Itisdecidedbytheeditorsofthe43magazine.LastyearthetitlewenttoEbolafightersandtheyearbeforethatPopeFrancis.TIMEMagazinegaveanumberofreasonswhyitchoseMerkelfromhowshe'shandledEurope'seconomiccrisistohowshe'srespondedtoterroristattacksintheregiontohowshe's44thecontinent'songoingrefugeecrisis.Herhigh45ratinginGermanyhasslippedrecentlybecausemanyGermansdon'tagreewithher46tothatcrisis.Sothereactioninherhomecountrywas47.NancyGibbstheeditorofTIMEwrotethattheChancellorwasawardedthetitleforaskingmoreofhercountrythanmostpoliticianswoulddareforstandingfirmagainsttyranny.ShealsopraisedMerkelthefirstwomantobenamedthetitlefor29yearsforherleadershipduringtherefugeecrisis.Atamomentwhenmuchoftheworldisoncemore48inadebateaboutthebalancebetweensafetyandfreedomtheChancellorisaskingagreatdealoftheGermanpeopleandbytheirexampletherestofusaswell.Sheviewsrefugeesasvictimstobe49ratherthan50toberepelled
化学对于人类的生活是一把双刃剑．在造福人类的同时也会带来危害． 1共享单车作为常用的代步工具既轻便灵活又符合环保要求如图1是一款自行车的示意图． ①所标物质中属于金属合金的是轮胎的材质是无机物或有机物 ②共享单车的停车位通常是露天的一般使用得防锈方法是．其原理是请再提出一条可延长自行车使用寿命的建议． ③当今自行车外形美观材质轻便牢固除了代步还可以作为健身工具．由此你对化学与人类生活的关系有何感想． 2化学知识应用得当即可以造福人类然而也会有人利用有限的化学知识牟取暴利却不知最终害人害己．近日在银川市西夏区同心路市场检查人员发现了河南省平顶山神鹰盐业公司生产的名为“代盐人”牌深井岩盐将盐倒入掌心反复揉搓加热后有明显的臭味即“臭脚盐”．经多方机构分析其特殊臭味的形成提出以下几种可能 1含有丁酸【C3H7COOH】等有机物 2含有亚硝酸钠【NaNO2】 3含有未完全处理干净的硫化氢． ①丁酸中各元素的质量比为 ②亚硝酸钠属于酸碱或盐其中氮元素的化合价是． ③硫化氢的化学式它的水溶液又称为氢硫酸．请写出氢硫酸和氢氧化钠发生的化学反应的方程式．
8分PoliceofficerLeonclearedhisthroat.Here'sthesituationBen.Mrs.Grady'sfurcoatismissing.YourgrandmotherdoeslaundryandcleaningforMr.Gradyandtodayshepaidoffhermortgage.Hehesitated.Mrs.Gradysuspectsyourgrandmothertookthecoatandsoldit.ThelastsentencehurtBendeeply.That'snottrue!Shepaidoffthemortgagewithmoneywesaved.Leonsighed.Where'sthepapertrailyoungboy?Whatdoyoumean?Papersreceiptsrecordstheofficersaid.Documentsprovingwherethemoneywassaved.IfyourgrandmothersavedhermoneyIneedtoseeproof.Benhurriedintothebedroomandreturnedwithapieceoftabletpaper.Ononesideofthepaperwasalonglistofwordsandnumbers.Benhandedthepapertotheofficer.It'sallthere.WorkIdid.LaundryandcleaningOmadid.OfficerLeonturnedoverthepaper.What'sthis?Myoutsidebankmap.Weburiedthemoneyinajaroutinthegarden.SeethebankbuildingIdrewnexttothetree?.ButwhataboutMrs.Grady'sfurcoat?YoushouldaskMr.GradyansweredOmacalmlyfromthedoorway.Hehiredmetocleanupthefur.Ipromisedtokeepitasecretforhiswife'sbirthdayandIdelivereditjustnow.Mrs.Gradywasverypleased.Embarrassedbutpleased.Omasmiledpolitelyatthepoliceofficer.Aftertheywavedgood﹣byeOmasaidtoBen:Afierdinnerlet'supdatethemap.WhatforOma?Hereyestwinkled.Ithinkweneedtoaddanotheroutsidebank.Oneforschoolsupplies.Asmartboylikeyouwillneedalotofpencilsandbooks.1WhoisOmaaccordingtothepassage?A.Acriminalwhostealsmoney.B.Mrs.Grady'shousekeeper.C.Theyoungboy'sgrandma.D.Amanagerofthelocalbank.2Whatdoweknowabouttheoutsidebank?A.It'sapieceoftabletpaperkeepingrecords.B.It'sajarusedtohidemoneytheyearned.C.It'sabankwhichislocatedbesidesthetree.D.Omaborrowedmoneyfromittopayforthemortgage.3WhatareOmaandBengoingtodoafterdinner?A.Theywillopenanotherbankaccount.B.Theywillcelebratetheirinnocence.C.TheywillbuyschoolsuppliesforBen.D.Theywillburyanothercontainer.4WhichofthefollowingbestdescribesOmaaccordingtothepassage?APoorandhonest.B.Productiveandcalm.C.Generousandtraditional.D.Optimisticandcreative.
下列变化中属于物理变化的是
观察和实验是学习化学的重要方式下列实验现象描述正确的是
8分Addingmathtalktostorytimeathomeisawinningequationforchildren'smathachievementaccordingtoanewresearchfromtheUniversityofChicago.ThestudyfrompsychologistsSianBeilockandSusanLevineshowsamarkedincreaseinmathachievementamongchildrenwhosefamiliesusedBedtimeMathaniPadappthatdeliversengagingmathstoryproblemsforparentsandchildrentosolvetogether.Evenchildrenwhousedtheappwiththeirparentsaslittleasonceaweeksawgainsinmathachievementbytheendoftheschoolyear.Theapp'seffectwasespeciallystrongforchildrenwhoseparentstendtobeanxiousoruncomfortablewithmath.Previousresearchfromthisgrouphasdemonstratedtheimportanceofadults'attitudesaboutmathforchildren'smathsuccess.Forexamplearecentstudyfoundthatmath﹣anxiousparentswhohelptheirchildrenwithmathhomeworkactuallyweakentheirchildren'smathachievement.Thenewfindingsdemonstratethatstructuredpositiveinteractionsaroundmathathomecancutthelinkbetweenparents'uneasinessaboutmathandchildren'slowmathachievement.ManyAmericansexperiencehighlevelsofanxietywhentheyhavetosolveamathproblemwithamajorityofadultsfeelingatleastsomeworriesaboutmathsaidBeilockprofessorinPsychologyandauthorofChokeabookaboutstressandperformance.Thesemath﹣anxiousparentsareprobablylesslikelytotalkaboutmathathomewhichaffectshowcompetenttheirchildrenareinmath.BedtimeMathencouragesadialoguebetweenparentsandkidsaboutmathandoffersawaytoengageinhigh﹣qualitymathinteractionsinalow﹣efforthigh﹣impactway.Studyparticipantsincluded587first﹣gradestudentsandtheirparents.FamiliesweregivenaniPadinstalledwithaversionoftheBedtimeMathappwithwhichparentsandtheirchildrenreadstoriesandanswerquestionsinvolvingmathincludingtopicslikecountingshapesandproblem﹣solving.Acontrolgroupreceivedareadingappthathadsimilarstorieswithoutthemathcontentandquestionsrelatedtoreadingcomprehensioninstead.Children'smathachievementwasassessedatthebeginningandendoftheschoolyear.Parentscompletedaquestionnaireabouttheirnervousnesswithmath.Themoretimesparentsandchildreninthemathgroupusedtheappthehigherchildren'sachievementonamathassessmentattheendoftheschoolyear.Indeedchildrenwhofrequentlyusedthemathappwiththeirparentsoutperformedsimilarstudentsinthereadinggroupbyalmostthreemonthsinmathachievementatyear'send.74.BedtimeMathisaniPadappthat.A.requiresparentsandchildrentoanswerreadingcomprehensionquestionsB.assesseschildren'smathachievementandparents'nervousnesswithmathC.teacheschildrenhowtocountrecognizeshapesandsolvepracticalproblemsD.encourageschildrentogetherwiththeirparentstosolvemathstoryproblems75.Thepreviousstudyfoundthat.A.helpfrommath﹣anxiousparentsimproveschildren'smathachievementB.children'mathachievementisrelatedtoparents'attitudeaboutmathC.interactionsaroundmathathomewillcutoffthefamilyrelationshipD.childrencanachievemoresuccessiftheyseetheimportanceofmath76.Wecaninferfromthepassagethat.A.childrenusingappforthreemonthscanseegainsinmathachievementB.childrenwhoseparentsareuneasyaboutmathoutperformotherstudentsC.itisthemathproblemsrelatedtothestoriesthatmakethegreatdifferenceD.thefrequencyofusingtheapphasnothingtodowithchildren'sachievement.77.Whichisthebesttitleforthepassage?A.High﹣qualitymathinteractionsimproveperformance.B.Frequentuseofappcandevelopproblemsolvingability.C.Low﹣effortactivitiescreategoodparent﹣childrelationship.D.High﹣anxietyparentsinfluencechildren'sattitudeaboutmath.
铝合金氧化铝硫酸铝三种物质的分类正确的是
除去以下物质中的少量杂质所用试剂及方法正确的是
2分虽然他很快恢复了健康医生还是建议他不要熬夜太晚.despite.
8分About60percentofAmericanstudentsgodirectlyfromhighschoolintocollege.Choosingacollegecanbedifficult.But25thesestudentsareincollegethereisoneotherchoicethatseemstobeeven26hard﹣decidingonamajor. OnaveragecollegestudentsintheUnitedStateschangetheirmajorthreetimes.Thereareseveralreasonsforthisaccordingtoacademicadvisers.Abouthalfofallfreshmenstartcollegenotknowingwhattomajorin.27thosewhothinktheyknow28theywanttostudysixoutoftenendupchangingtheirmajoraswell. Collegeisatimeofdiscovery.Asstudentstakeclassestheyfindnewareasthattheyareinterestedin.Unfortunatelysomeofthosestudentsfindsomanyinterestingclasses29theyarenotabletodecideonamajor.Someadviserssaythatstudentsneedbettertoolsbothincollegesandinhighschools30helpthemfigureoutwhatmajorisbestforthem.Afewuniversitieshavestartedofferingspecialcomputerprogramstohelp.Studentscanlearnmoreaboutdifferentmajorsorevenaboutwhatkindsofjobspeoplefindwitheachkindofmajor.Theyaresometimessurprisedtofindphilosophymajors31workforasoftwaredevelopmentcompanyorbiologymajorsinthetourismindustry.Evenwithmanytoolsavailabletothemchoosingamajorisdifficultformanystudents.
按要求用相应的化学符号填空． 1空气中含量最多的物质 22个钠离子 3相对分子质量最小的氧化物．
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
湘公网安备 43130202000226号