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A、B、C、D、E、F是教案备课库常见的物质，已知A是一种单质，B为红棕色固体，D常用于改良酸性土壤，F与B属于同类物质，其相互反应情况如图所示（短线“﹣”相连的物质碱能反应，箭头“→”表示能生成）．...
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教案备课库《》真题及答案
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已知ABC为教案备课库上常见的物质并且存在下面关系条件略去A→B→C→A．请写出一组符合要求的ABC
下列各组转化关系中的反应为教案备课库常见的反应其中→表示某种物质可一步反应生成另一种物质．甲乙丙三种
A
B
C
D
已知A～E是教案备课库中常见的物质它们之间的关系如图所示相互之间的连线表示能发生化学反应．已知D是一
以下叙述不属于教案备课库学习特点的是
教案备课库以"化学物质"为学习对象和学习内容
教案备课库的学习是基础性、启蒙性的
教案备课库的学习是以实验为基础的
教案备课库的学习以学生自学为主
A～G为教案备课库中常见的物质其中F为一种常见的气体G为一种常见的液体．它们之间在一定条件下的转化关
A﹣H都是教案备课库常见的物质已知AB都是黑色固体DF为红色固体它们之间的转化关系如图所示．则A的化
ABCD都是教案备课库中的常见物质具有如图所示的转化关系反应条件有些反应物或产物已略去若A是一种白色
A.B.C.D.E.FG都是初中阶段化学常见的物质.A是一种紫红色固体加热后生成B.C.D三种物质气
ABCDEF是教案备课库上册常见的六种物质它们之间有如图所示的关系箭头表示一种物质可以转化成另一种物
A〜F是教案备课库常见的物质己知ABCDE是五种不同类别的物质．a足空气中含有的一种气体e是地壳中含
A→D是教案备课库常见的不同类别的物质已知化合物AB中含有两种相同的元素．它们之间的关系如图所示一表
ABCD是教案备课库中的常见物质它们之间有如图所示的转化关系请根据有关信息填写若C为一种密度最小的气
A.～G.均为初中常见的化学物质→表示物质间的转化关系—表示两端的物质能发生化学反应其中A.F.是初
A～F是教案备课库常见的物质已知ABCDE是五种不同类别的物质A是空气中含有的一种气体E是地壳中含量
A.～G.均为初中常见的化学物质→表示物质间的转化关系—表示两端的物质能发生化学反应其中A.F.是初
已知A～E是教案备课库中常见的物质它们之间的关系如图所示相互之间的连线表示能发生化学反应．已知D是一
AB是教案备课库常见的两种盐A是硫酸盐B是一种常见碱其中A是一种既不溶于水也不容于硝酸的沉淀B是一种
A～F是教案备课库常见的物质已知ABCDE是五种不同类别的物质A是空气中含有的一种气体E是地壳中含量最
如图中ABCDEF是教案备课库中常见的物质且ABCDE是五种不同类别的物质已知A由两种元素组成B是生
ABCD四种物质的转化关系如图所示它们均为教案备课库中常见的物质其中A是一种黑色氧化物B物质的溶液呈
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D四种物质的转化关系如图所示，它们均为教案备课库中常见的物质，其中A是一种黑色氧化物，B物质的溶液呈蓝色．则X可能为（ ）
A．H
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B．HCl C．NaOH
Cu（OH）
2
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正是为了人民的利益一些政府官员抵制金钱和权力的__将经济改革进行到底.It.
Talkingtohuman﹣likedevicescanbegreatfun﹣justaskSiritotellyouajoke.Butitmuyalsoleadtoproblems. ArecentstudybyscientistsfromtheUniversityofKansasintheUSfoundthathuman﹣likedeviceskeeppeoplefromseekingoutnormalhumaninteractionwhentheyfeellonely. Duringaseriesofexperimentspanicipantswereaskedtowriteaboutatimewhentheyfeltlonely.Theyalsotookpartinanonlinegameofcatchagainstacomputerprogramthatwasdesignedtothrowthehalltootherplayersmoreoftenbutparticipantsbelievedtheywereplayingwithrealpeopleonline. Participantswerethenintroducedtohuman﹣likeproductsincludingavacuumcleaner真空吸尘器designedtoappearasifitweresmiling.Theywerealsoaskedtothinkabouttheirphoneinhuman﹣liketermsconsideringquestionslikehowmuchdoesithelpyou Theresultsshowedthattheparticipantswerehappywiththecomforttheygotfromthemachinesanddidn'tneedtoseekoutnormalhumaninteraction. Generallywhenpeoplefeelsociallyexcludedtheyseekoutotherwaystoreduce thefeelingofloneliness.NormalwaysincludeincreasingtheirnumberofsocialmediafriendsorengaginginbehaviorstoseekoutinteractionwithotherpeopleaccordingtoJennyOlsonassistantprofessorofmarketingatKU. Butitwasn'tallbadnewsastheteamfoundthattherewerelimitstohowfarthiseffectwouldextend. Assoonaswetellpeopleweknowthatitlookslikethevacuumcleanerissmilingtheyseemedtorealizeitwasamachineandnotaperson.OlsontoldDailyMail.Theeffectgoesaway.Thisseemstobehappeningonaverysubconsciouslevel. Researchersbelievetheresultsarcimportantforconsumerstorealizehowthesetypesofproductscouldaffecttheirsocialinteractionwithrealpeopleespeciallybecausesomanynewproductsfeatureinteractivity. lfsomeonenoticestheyaretalkingmoretoSirilatelymaybethathassomethingtodowithfeelinglonely.Olsonsaid.Fromthatstandpointit'simportanttobeawareofit. Thestudycouldalsohelpcompaniesdesignproductsthatcanincreasethewell﹣beingofpeoplewhofeellonelywithoutsacrificingnormalsocialinteraction. Maybeiiismoreaboutimprovingourcurrentrelationships.Olsonsaidsuchastakingabreakfromscreentimeandfocusingondevelopingyourrealpersonalconnections. 56.ResearchersfromtheUniversityofKansasfoundthat. A.hunum﹣likedevicesmayhelppeopleinteractwithothers B.interactionswithhuman﹣likedevicesmaymakepeoplefeellonely C.lonelypeoplemayeasilybecomeaddictedtohuman﹣likedevices D.human﹣likedevicesmayreducepeople'ssocialinteractioninreallife 57.Duringtheexperimentsparticipants. A.wereallowedtotalkwithhuman﹣likedevices B.wereshowndeviceswithhumanfeatures C.playedonlinegameswithbothmachinesandrealpeople D.wereencouragedtoengageinnormalhumaninteraction 58.TheunderlinedphrasethiseffectinParagraph7referstothefactthat A.lonelypeoplearemorelikelytoseekoutinteractionwithotherpeople B.lonelypeoplearecontenttointeractvviihhuman﹣likemachines C.thefeelingoflonelinessdeepensaspeopleinteractwithhuman﹣likedevices D.peoplewhoaresociallyexcludedwillhavedifficultyinsocializing 59.Oneofthesignificancesofthestudyisthatit. A.showspeoplewhyhuman﹣likeproductsmakethemfeellonely B.warnspeopletoabandonhuman﹣likedevicescompletely C.forceslonelypeopletogetinvolvedinnormalsocialinteraction D.helpcompaniesrealizethelimitationofhuman﹣likedevices.
AstudybySanDiegoZooGlobalconservationistsreleasedthisweekSept.122016issheddingnewlightonhowscientistsevaluatepolarbeardietandweightlossduringtheirfasting禁食season.Onaverageapolarbearlosesupto30percentofitstotalbodymass体重whilefastingduringtheopen﹣waterseason.Althoughsomescientistspreviouslybelievedland﹣basedfoodscouldsupplement补充thebears'nutritionalneedsuntiltheseaicereturnsanewstudypublishedinthescientificjournalPhysiologicalandBiochemicalZoologyhasrevealedthataccesstoterrestrialfoodisnotsufficienttoreducetherateofbodymasslossforfastingpolarbears. Thestudy﹣﹣undertakenbyManitobaSustainableDevelopmenttheUniversityofAlbertaandEnvironmentandClimateChangeCanada﹣﹣weighedpolarbearsthatweredetainedinthePolarBearHoldingFacilityinChurchillManitobaCanadafrom2009to2014.PolarbearswerekeptinthisfacilityaspartofthePolarBearAlertProgramwhichaimstoreduceconflictbetweenhumansandpolarbearsaroundthetownofChurchill.Topreventhabituationpolarbearsarenotfedwhileinthefacilitywhichallowedforacontrolledmeasureoftheirweightloss.Onaveragepolarbearslost2.2pounds1kilogramofmassperday﹣﹣exactlythesameamountasfree﹣ranging自由放养的bearsmeasuredduringtheice﹣freeseasononthecoastlineofHudsonBay.Scientistsreportedthatevenwithland﹣basedfoodopportunitiespolarbearslostthesameamountofweight. Somestudieshavesuggestedthatpolarbearscouldadapttoland﹣basedfoodstooffsetthemissingcaloriesduringashortenedhuntingperiodontheicesaidNicholasPilfoldPh.D.leadauthorofthestudyandapostdoctoralassociateinAppliedAnimalEcologyatSanDiegoZooGlobal.Yetourresultscontradictthisasunfedpolarbearsinourstudylostmassatthesamerateasfree﹣rangingbearsthathadaccesstoland﹣basedfood. Researchersalsoestimatedstarvationtimelinesforadultmalesandsubadultsandfoundthatsubadultsweremorelikelytostarvebeforetheiradultcounterparts.SubadultpolarbearshavelowerfatstoresandtheaddedenergydemandsassociatedwithgrowthsaidPilfoldFuturereductionstoon﹣icehuntingopportunitiesduetoseaicelosswillaffecttheyoungerpolarbearsfirst﹣﹣especiallygiventhatthesebearsareless﹣experiencedhunters. 63.Whatisthefindingofthisnewly﹣releasedstudy A.Wildpolarbearsarefacingthedangerofstarvationandextinction. B.Land﹣basedfoodcan'tmeetthenutritionalneedsofwildpolarears. C.Wildpolarbearscanavoidweightlossinaproperlydesignedfacility. D.Traditionalwaystomeasurepolarbeardietandweightlossarenotaccurate. 64.WhichofthefollowingisTRUEaboutthestudy A.ItwasactuallypartofthePolarBearAlertProgram. B.Itaimedtopreventthepolarwildlifefromextinction. C.Itcomparedtheweightlossbetweenunfedandfree﹣rangingpolarbears. D.ltmeasuredtheweightofpolarbearsduringon﹣icehuntingseasons. 65.Theunderlinedwordinthefourthparagraphmeans. A.takeover B.takeup C.makeinto D.makeupfor 66.Thereasonswhysubadultsaremorelikelytosufferduringopen﹣waterseasoninclude. Theyhavelessfatstorage. Theyneedmoreenergyforgrowth. Theylackhuntingopportunities. Theyareslowerinadaptingtoiceloss. A.①②B.③④C.①②③D.②③④
随着物联网技术的发展智能家居已悄然走向前台．下图为智能家居中的安防系统和饮用水净化系统请回答问题 1安防系统 门禁系统智能家居的门禁系统倾向于利用生物识别如指纹锁等．不同的人指纹不同指纹是人的一种性状由决定．烟雾报警图1是烟雾报警器的简化原理图其中电源电压恒定不变R0为定值电阻R为光敏电阻当有烟雾遮挡射向光敏电阻的激光时电路中的电流减小到某一数值时报警器开始报警．则光敏电阻的阻值随光照强度的减弱而选填“增大”“减小”或“不变”此时电压表示数较未报警前选填 “增大”“减小”或“不变”． 2饮用水净化系统 如图2所示在饮用水净化系统中设备①②③的作用分别是．
假定你是李华你的美国交换生同学Amber想去参加市博物馆的外籍志愿讲解员选拔活动发邮件向你征求意见.请你回复邮件内容包括 1.表示支持并说明理由 2.参选前需要做的准备. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. 参考词汇讲解员docent
Agrouptripismuchmoredifferentthanwhatonemightexpectwithanorganizedtourorasoloholiday.1Thusitiscertainlyanexperiencetoenjoy. Goingonholidaywithagroupoffriendsisallabouthavingfuncreatingmemoriesandtryinganewexperiencewithasharedinteresttotravel.2Italsohelpsyoulearnmoreabouthowtotravel.Whetheryoudecidetogoinalargegroupofupto10peopleormoreorgoinamuchsmallergroupof4grouptripsareagreatwaytobondandreconnectwithoneanother.3Itcanhappenperiodicallyperhapsonceortwiceayear. Planningagrouptripmaybedifficultbuttheresultwillbesatisfying.Chooseapopularlyknowndestinationoranunknowndestination.Thisdecisioncanactuallysetthefoundationforthemoodofthetrip.4Thiswillgivegroupmembersanideaofwhattheycanexpectforthenextgrouptrip. Thepurposeofthegrouptripforsomemaybetoescapefromthecityortheircurrentbusyschedules.5Whethertheywillbepositiveornegativememoriesthemainideaisthatasagrouptheywillbeabletolinktheirtriptothememoriescreated. A.Besidesitdoesn'thavetobeaconstantactivity. B.Youwillonlyenjoysuchatriponceinalifetime. C.Itmeansbeinginsidejokesgreatstoriesandplentyoflaughs. D.It'sspecialbothinitsformandtheuniqueexperienceitoffers. E.Forothersitmaybetocatchupwithfriendsoveraperiodoftime. F.Theyhavebeenalonefortoolongatimeandthusbadlyneedatrip. G.Youwillexperienceneworfamiliardestimationswithcloseacquaintances.
下列关于四种粒子的结构示意图的说法中不正确的是
某工厂化验室用稀盐酸测定造纸厂废水中氢氧化钠的质量分数取废水样品100g倒入烧杯中逐滴加入9.8%的稀硫酸至恰好完全反应共用去稀硫酸50g请计算 温馨提示H2SO4+2NaOH＝Na2SO4+2H2O 1中和废水所用硫酸的质量 2废水中氢氧化钠的质量分数．
下列食物中富含蛋白质的是
下列食物中富含维生素的是
Onetrendinappdevelopmentispositivityprogramsdesignedspecificallytohelpretrainourbraintothinkpositively.Hereareourtoprecommendationsforappstoimproveyourpositivemood. ThinkUp Havinga4.7starratingthisappisaheavyhitterintheworldofpositivityapps. Peoplearefindingthattheycanlearntobepositiveandsavetheirlivesfromtheconvenienceoftheirhandhelddevices设备.Wenolongerhavetogotothelibraryandcheckoutbooks.Justdownloadthisfreeappandstartthinkingpositivelyandwatchhowyourlifechanges. Shine Thisappisrecognizedasthebestof2018andithelpsyouwithdailymotivationandpersonalcare.Thisapp'sgoalistohelpreduceyourstresssodon'tworryaboutaddingonemorethingtoyourto﹣dolist.Theysendmotivationaltextsincludingagratitudejournal.Thisisanincrediblewaytechnologyjoinsgreatmindssowecanallimprovetogether! Happler Holdingastrong3.9starevaluationgradethisisonewelove.Itcanhelpyoukeepajournalhasincrediblecoursesandletsyouexchangeideaswithawholecommunityofpeopleworkingtobecomemorepositive.Welovethecreativitythatwentintomakingthisappandthinkithasalottooffer. Motivate Thisappgainsa4.8starratingafterover2622ratingswhichhashandpickedmotivationvideosandmusicplaylistsforanymoodyou'dliketogetinto.Ifyouneedtorelaxorgetenergizedorinspiredtogrowinspecificareasofyourlifethisuniqueappwillhelpyouchooseyourcategoryandgetyouthinkingpositivelyaboutitthroughtheuseofimagesandmusic. 1Whichcanhelpyouwithpersonalcare? A.ThinkUp. B.Shine. C.Happier. D.Motivate. 2Whatdothefourappshaveincommon? A.Theyofferinteractiveteaching. B.Theyenableuserstobemorepositive. C.Theyareallstar﹣rated. D.Theyhelppeoplereachtheirgoals. 3What'sspecialabouttheappMotivate? A.Itgainsthehighestrating. B.Ithelpspeoplekeepajournal. C.Itprovidesvideosandmusic. D.Itsendsmotivationaltexts.
“钢玉”又名红宝石其主要成分是“SiO2”其中硅元素“Si”的化合价是
现有XYZ三种金属已知①X和稀硫酸不反应②Z+H2SO4稀═ZSO4+H2↑③X+2YNO3═2Y+XNO32这三种金属的活动性顺序正确的是
只要在过程中尽力了你就没有必要太重视比赛的结果.needn..
如图是MN两种固体物质的溶解度曲线．下列说法不正确的是
InanewstudypublishedinjournalJAMAPaediatricsresearchersfoundtheamountoftimethatchildrenundertheageoftwospendlookingatscreensondigitaldeviceshasmorethandoubledovera17﹣yearperiod. Theteamtookalookbackatatimewhenmobilephoneusewasfarlesscommonthanitistodayassessingchildren'sscreentimein1997andthencomparingitto2014. TheresearchersusedstatisticspreviouslygatheredbytheChildDevelopmentSupplementPanelStudyofIncomeDynamicsattheUniversityofMichigananalysingdataregarding1327childrenin1997and443childrenin2014. AccordingtotheirfindingschildrenundertheageoftwointheUSwouldspendanaverageof1.32hoursinfrontofascreenonadailybasisin1997.By2014thisaveragehadincreasedto3.05hoursmorethandoublingover17years.Incomparisonchildrenagedbetweenthreeandfivespentanaverageoftwoandahalfhoursinfrontofscreensonadailybasisin1997.Thishadincreasedslightlytothreehoursadayby2014. ThereisgrowingconcernovertheamountoftimethatchildrenparticularlyveryyoungchildrenspendwatchingshowsandinfrontofscreenssaidWeiweiChenassistantprofessorintheDepartmentofHealthPolicyandManagement.Ourfindingsweresurprisingasitfeelslikemobiledevicesareeverywherebuttelevisionsarestillthemostcommonwayforyoungchildrentoconsumemedia.Furtherresearchisneededtoassesschangesinmediaconsumptionanddeviceuseinmorerecentyears. Expertswarnedthatvulnerablechildrencouldfacebecominglostindigitalspaceasthey'regrowingupwithoutenoughInternetsafetyeducation. 1Whatcanweknowaboutthenewstudy? A.Ittook17yearstoconduct. B.Itincludedchildrenbornin1997. C.Itcomparedstatisticsfromtwodifferentperiods. D.Itwasdonebytwoorganizationsworkingtogether. 2Howdidthedailyscreentimeofchildrenbetween3and5change? A.Italmostdoubled. B.Itreducedslightly. C.Itreached2.5hours. D.Itsawasmallchange. 3Whatsurprisedtheresearchers? A.ChildrenspentmoretimeonTVthanonmobiledevices. B.Digitaldevicesgainedmorepopularityamongchildren. C.Childrenstaredatscreensformuchlongerthanbefore. D.Digitaldevicesfailedtoattractyoungchildren. 4Whatisthebesttitleforthetext? A.ScreenTimeDamagesChildren'sHealth B.NewMethodsFoundtoReduceScreenTime C.ParentsInstructedtoLimitChildren'sScreenTime D.ChildrenunderTwoSpendTwiceLongeronScreens
如图所示某反应的微观示意图中获得的信息不正确的是
将一种金属M投入AgNO3和CuNO32的混合溶液中充分反应后溶液变为无色．过滤得到滤渣和滤液． 1根据所学知识及上述现象判断MAgCu三种金属的活动性由强到弱的顺序是． 2下列说法正确的是填序号 a．M可能是Feb．滤液中滴入稀盐酸可能产生白色沉淀 c．滤渣中滴入稀盐酸一定有气泡产生d．滤渣中一定有Ag和Cu可能有M．
写出符号“3O2﹣”中数字的含义 “3”表示 “2”表示．
Chinesedragons龙arefictionalcreaturesarootofChinesepeoplewhoconsideredthemselvesasthedescendants后代ofdragons.SincetheircreationChinesedragons1winthedeeplovefromChinesepeoplebecauseof2theystrongpowerandsymbolicmeanings.Theyplayed3importantroleinthehistoryofChinesenationpoliticsreligioncultureandChineselanguageandbecameasymbolofChinaandChinesepeople. DragonisabeliefofChinesenationanda4goldChineseelement元素.WhenapersonhearsthenameofdragonChina5cometohisorhermind.Asthestrongestanimal6selectbyChinesepeopledragonhasthestrongestpower7helpsitgototheHeavenandtheHellandmakecloudandrains.Inancienttimesasabeliefdragongavestrongsupportstotherulingofabignationandtopeople'sfragilespiritsandhardlifebecausepeoplesufferedfromextremenaturaldisastersandlack8thesupportsfromscience.The9importantofdragontoChinesepeopleislikewatertocreaturesandit10reflectinpeople'sspiritbeliefsandideology.
实验室常用如图所示装置探究可燃物的燃烧条件．下列说法错误的是
下列是生活中一些常见物质的近似pH其中酸性最强的是
水是生命之源我们应该了解水爱护水资源请回答 1生活中的自来水属于填“纯净物”或“混合物”． 2使用硬水会带来许多麻烦日常生活中可用检验硬水和软水通过的方法既能降低水的硬度又能杀灭部分细菌．自来水厂的净水过程中常利用活性炭的性除去水中的异味和色素． 3如图为电解水的实验装置图．接通电源观察到两电极都有气泡产生．通电一段时间后ab两玻璃管收集的气体体积比约为该实验证明了水是由组成的． 4二氧化氯是新一代饮用水的消毒剂我国成功研制出制取二氧化氯的新方法其反应的原理是通过氯气Cl2与亚氯酸钠NaClO2反应生成二氧化氯气体和氯化钠．请写出反应的化学方程式．
如图所示倾斜装置使液体和固体混合气球体积没有明显变化的是
A.changingB.availableC.exposureD.worsenE.sensitive F.densityG.restH.shadedI.refleciionsJ.interruptedK.fighting Areyoureyesdrywateryseeingdoubleor31tolightanddoyourbackandneckacheIfsoyouarelikelyoneofmanypeopletodaywhosufferfromdigitaleyestrain视疲劳alsocalledcomputer﹣visionsyndrome. Eyestrainisoftenrelatedtotheamountof32toscreensthedistancefromeyestoscreensandtheuseofmultiplescreensatthesametime.Howeverstudies havealsoshownthatthebluelightproducedbydigitaldevicesreachesfurtherintotheeyesthanotherkindsoflight.Thislightactuallyassisisattentionduringthedaybutcanresultin33sleeppatternsatnight. Scientistshavestatedthateyestrainisnotanecessaryevileveninamodernworldthatcirclesaroundtechnology.Sometimes34somesimpledetailsaboutyourrelativepositiontoscreenssuchasslayingabout60centimetersawaywillhelp.Alsoavoidoverheadandotherdirectsourcesoflightanduse35lampsandwindowblindswhilelookingatdigitaldevicesinstead. Beyondthewaysthatyourelatetodigitalscreenstherearealsowaystochangehowyouviewscreensthatarehelpfulin36eyestrain.Tobeginwithyourcomputerscreenshouldbehigh﹣resolution高分辨率andmayrequireascreentodecrease37.Alsobeawarethat''computerglasseswhichcutdownglare刺眼的光}andbluelightare38onthemarkect. Finallymanyofusfallintobadhabitswhileusiugdigitalscreensthatonly39theeffectsofeyestrain.Whenviewingdigitalscreensmanypeopleblink眨眼onethirdlessoftenthantheyusuallydo.Placeareminderonyourcomputertoblink!sothatyoureyesdon'tdryout.Also40youreyes'focusingmusclesbyusingthe20﹣20﹣20ruleevery20minutesfocusonsomething20feetawayfor20seconds. Therearemanyothermethodsusedtohelprelieveeyestrainsofindwhatworksforyouratherthangivingintotiredvision.
在元素周期表中镁元素的信息如图所示下列有关说法不正确的是
WiththeaveragenumberofchildreninaBritishfamilyfallingunderanaverageof2.0comparedwiththetraditional2.4childrenthepopulationoftheUKhasbeenfallingforquiteafewyears. Whyaren'tBritishpeoplehavingasmanychildrenastheyusedtoWelltherearemanyreasons.OneofthemisthatBritishpeoplearenowhavingtheirchildrenatamucholderagethanpreviouslymeaningtheyhavefeweryearsinwhichtheycanhavechildren.Mostyoungpeopletodaywantawell﹣paidjobsotheyoftengotouniversityafterhighschoolafteryearsofstudyatuniversitytheythenneedafewyearsofworkexperiencebeforetheycangetthejobtheywant.Soit'snotuntiltheyareabout30yearsoldthattheycanstarttothinkaboutsettlingdownandhavingchildren. AnotherreasonisthatitisrelativelyexpensivetobringupachildintheUK.Usuallybothparentsneedtoworktopayfortheirhomeandlivingexpenses.Theyneedtopaysomeonetolookaftertheirchildduringthedaywhichisexpensive. InadditionproblemsintheglobaleconomyoftenaffectBritishfamilies.Forexamplewhentimesaretoughandthereisaneconomicdownturnitbecomesdifficulttofindajoborkeeptheexistingone.Thiskindofuncertaintydiscouragespeoplefromhavinglargerfamilies. SowhatisBritaindoingtotryandsaveBritishfamiliesFirstofallthegovermmentistryingtomakeitcheapertohavechildren.Forexampletherehavebeenincreasesinmoneyfamiliescangainfromthestateeachmonth.Alsothereisanincreasingamountofmoneyfornurseryschoolssothatparentsdon'tneedtopaysomuchforchildcare.Inadditiontherearenowlawsallowingparentstotakemoretimeoffworksothattheycanlookaftertheirchildrenthemselvesratherthanhavingtopayotherstodoit. .
葡萄酒营养丰富适量饮用具有健身养颜的功效．下列家庭酿制葡萄酒的过程中属于化学变化的是
空气中含量较多且性质活泼的气体是
化学是一门以实验为基础的科学．请结合图示回答问题 1写出仪器a的名称． 2实验室用氯酸钾和二氧化锰制取氧气反应的化学方程式为应选择的发生装置是填字母．用E装置收集氧气若氧气不纯可能的原因是． 3雨欣同学选用图1中的填字母装置制取二氧化碳并与图2装置连接验证二氧化碳能与水反应生成一种酸性物质．F的作用是除去氯化氢气体G中的试剂是．当通入二氧化碳一段时间后H中纸花I中的纸花．
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