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下列实验中需保持细胞生理活性的是 ①叶绿体中色素的提取和分离 ②洋葱鳞片叶表皮细胞质壁分离和复原 ③细胞有丝分裂的观察 ④观察DNA和RNA在细胞中的分布 ⑤观察细胞中的线粒体和叶绿体 ⑥低温诱导植物染色体数目的变化 ⑦探究酵母菌的细胞呼吸方式．
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
厨师在厨房炒菜时加了料后再加醋就让菜肴变得香美可口这其实隐藏了一个化学的小秘密醋中的乙酸与料酒中的乙醇反应生成了有香味的乙酸乙酯下表中是几种常见的酯请完成下列问题 1甲酸甲酯中碳元素氢元素氟元素的质量比为其中氢元素的质量分数为保留0.1% 2比较归纳是学习的重要方法根据表推测X的化学式是 3丙酸丙酯中氧元素的质量分数填“大于”“小于”或“等于”丁酸丁酯中氧元素的质量分数 4若菜肴中的乙酸乙酯在人体内代谢时其中的碳元素完全部转化为CO2则44mg的乙酸乙酯完全代谢产生的CO2的质量为多少请写出计算过程
下列化学实验操作不符合规范的是
蒸馏水清水和酒精是生物实验中常用的两种冲漂洗试剂以下关于它们的用法错误的是
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.
用去除脑但保留脊髓的蛙称脊蛙为材料进行反射活动实验．下列叙述错误的是
果蝇的灰身与黑身是一对相对性状受等位基因Aa控制红眼与白眼是另一对相对性状受等位基因Bb控制．现有2只雌雄果蝇杂交子代表现型及比例为灰身红眼雌果蝇灰身红眼雄果蝇灰身白眼雄果蝇黑身红眼雌果蝇黑身红眼雄果蝇黑身白眼雄果蝇＝633211不考虑其他等位基因且不含等位基因的个体均视为纯合子．下列相关叙述中错误的是
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.
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..
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
瘦素是由白色脂肪细胞分泌的一种蛋白质类激素科学家发现这种激素可以通过减少进食量促进产热来减轻哺乳动物的体重．为了研究该激素的调节机制科学家进行了系列实验． 1给健康的饥饿小鼠饲喂/注射瘦素后小鼠产热增加推测此时小鼠散热的机制是皮肤和分泌增强以维持体温的相对恒定． 2现有两类患肥胖症的小鼠B小鼠肥胖是瘦素基因缺陷所致A小鼠肥胖原因未知．科学家进行连体共生即通过手术使两只小鼠的血液循环贯通实验如表 根据实验结果推测在连体前与正常小鼠比较B小鼠体内瘦素的含量较低/一样/较高A小鼠肥胖的原因最可能是．为排除手术对实验结果的干扰可增设一组处理措施为的对照实验．
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
街头艺术家运用创意将鲜艳明亮的色彩带进了老社区.bring.
根据如图所示装置图回答有关问题． 1请写出仪器的名称①②． 2写出实验室用氯酸钾和二氧化锰制取氧气的化学方程式可选用的发生装置是． 3利用装置B制取氧气时反应的化学方程式是．实验结束后若要分离出锥形瓶中的固体物质应采用的分离方法是． 4能用E装置收集氧气的原因是．利用收集到的氧气做“铁丝在氧气中燃烧”的实验反应的化学方程式为． 5如果用A和E装置制取氧气收集到的氧气不纯的原因可能是填字母． A．装置漏气 B．收集之前集气瓶中水未装满留有气泡 C．导管口开始有气泡放出时立即收集 D．停止加热时先熄灭酒精灯然后把导管移出水面．
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
某种植物的花色有白蓝和紫三种颜色花色受两对等位基因Aa和Dd控制且两对基因分别位于两对同源染色体上．花色相关的色素遗传如图所示请回答 1控制花色的基因遵循定律判断的理由是． 2开蓝花植株的基因型为． 3现有花色基因型为AADDaaDD和aadd的三个纯合品种从中任意选出所需品种在最短时间内培育出大量能稳定遗传的蓝色品种写出培育流程要求写出遗传图解并配有简要的相关文字说明
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．
近年来京津冀地区饱受沙尘暴之苦．因此保护生态环境大力开展植树种草防止沙漠化等是当前的紧要任务． 1在退耕还林还草过程中要生态工程的原理做到树种草种不能过于单一同时也要遵循生态工程的原理才不会出现“前面造林后面砍林”的现象． 2防止沙漠化最好种植耐旱性植物科研人员将获得的大肠杆菌中的海藻糖合成酶基因导入植物细胞中并获得有效表达增强了植物的耐旱性．获得的海藻糖合成酶基因可利用PCR技术扩增该技术反应体系中除含缓冲液引物和dNTP以外还应含有其中dNTP的作用是设计引物时要注意避免． 3如图为用探针检验某一转海藻糖合成酶基因抗旱植物基因型的原理相关基因用R和r表示． ①若被检植株发生A现象不发生BC现象则被检植物的基因型为． ②经检测抗旱基因已经导入烟草细胞但未检测出抗旱基因转录出的mRNA从构建基因表达载体的角度推测最可能的原因是．
下列有关实验操作与实验现象的叙述错误的是
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.
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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