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AlotofgreenparksinTongzhouinthefuture. A.build B.built C.isbuilt D.willbebuilt
阅读以下两则信息回答相关问题 ①氟利昂曾经是一种很好的制冷剂自1987年国际规定禁止使用因为氟利昂分解出氯原子能引发下列循环反应而破坏臭氧O3层①Cl+O3→ClO2②ClO+O3→Cl+O2 O3和O2的化学性质不同的原因是． ②自然界中含氮化合物中常见的氮元素为14N某位研究者用同位素示踪法做了一个实验给绿色植物使用具有放射性15N的氮肥人吃了这些食物最终在人尿中检测出15N那么14N和15N两种原子的本质区别为．
某初中一次课外活动举行了一次有趣的比赛“谁的四轮车一次运行的距离最远”．初三化学兴趣小组制作了如图所示的一辆小车他们往试管中加入两试种剂塞紧塞子通过产生的气体喷出时的反冲力使小车向前运动了．可选择的试剂①碳酸钙②生石灰③10%的稀盐酸④10%的稀硫酸 1测得10%的稀盐酸比10%的稀硫酸pH小则10%的稀盐酸酸性更填“强”或“弱”． 2理论上在加入的两种试剂总质量相同的条件下小组选择的最符合比赛要求的试剂应是填序号在试管中发生反应的化学方程式为． 3另一小组根据同样的推进原理但不进行化学反应也能使小车运动．他们向盛有水的试管中加入的物质可以是填化学式．
InNovemberof1995LesliewasworkingfortheDepartmentofSocialServicestohelpfosterchildreninNorthCarolina.Herjobistotakechildrenoutofdangeroushomesituationsandplacetheminfosterhomes寄养家庭.DuringherfirsttaskLesliesawmostofthechildrencarryingtheirthingsinplasticbags.Theydidn'thavesuitcases手提箱fortheirclothes.WantingtohelpthesechildrenLeslieaskedhermotherifshecouldhavethefamily'soldsuitcasestogivetothem. Leslie's10﹣year﹣oldsisterAbbyaskedhowmanyfosterchildrentherewereintheareaandfoundoutthattherewere300.Mostofthosechildrenhadtocarrytheirthingsinplasticbags.Leslie'scareandthethoughtofthose300childrenmadeyoungAbbytakeaction.Sheaskedpeopletogiveawaytheiroldsuitcasestothesefosterchildrenbymakingpostersandaskingotherchildrenforhelp.Butafterafewweeksshehadnotreceivedanyones.Abbydecidedtobuysomesuitcaseswithhermother'shelp.That'showAbbyBurnsidesetupherprogramSuitcasesforKids.ByMarchof1996SuitcasesforKidshadcollectedandsent175suitcasestothefosterchildren. FinallyAbby'seffortswerenoticedbythemedia.HerstorywasinnewspapersandmagazinesandAbbyappearedonpopulartelevisionshows.AsthestorybecameknownAbby'slocalchapter分支机构receivedmoreandmoresuitcasesuntilitcollected4000suitcasesin1996.SoonAbbywastravelingtodifferentstatestohelpsetupnewSuitcasesforKidschapters.Bytheendof1996therewereSuitcasesforKidschaptersin19differentstates.AftertwofullyearsSuitcasesforKidshadsetupchaptersinall50states.Byitssixthyearthelittleorganizationreachedinternationalattentionhavingchaptersinmorethantencountries.Nowthousandsofchildrenaroundtheworldcancarrytheirthingsinsuitcasesinsteadofplasticbagsjustbecausea10﹣year﹣oldgirldecidedonedaythatshejustwantedtohelp. 1.WasLeslieworkingtohelpthefosterchildreninNovemberof1995? 2.WheredidLeslieseemostofthechildrencarryingtheirthings? 3.HowdidAbbyaskpeopletogiveawaytheiroldsuitcases? 4.HowmanysuitcasesdidAbby'slocalchapterreceivein1996? 5.Whatisthepassagemainlyabout?
同学们写作业时常会用透明胶带把错误处揭去操作时往往要把胶带用手抹几下使之纸贴紧才能揭干净这是为什么
WhenIwassevenyearsoldmyfamilymademeanantfarm.Firstweputcleansandinathinglassbox.Thenwewaitedfortheantstoarrive. Aftertheantswereintheglassfarmtheystartedtomaketunnels地道.Iwasamazedthateachoneknewexactlywhattodo.Eachhaditsownjob. Onthefifthdayatragedy悲剧happened.IputmyfacesoclosetotheglassfarmthatIknockeditover.Allthetunnelsfelldown.Althoughtheantsremainedaliveaftertheirearthquakeonebyonetheybegantodie.IwasscaredasIwatchedthemgiveupbuildingtheirtunnelstocarrythebodiestoacornerofthefarm. Mymothersaidthattheantsweredyingofsadness.Theysimplycouldnotstandthattheirtunnelsweregone. AlthoughmuchtimehaspassedIstillthinkofthatantfarm.Momhadhopeditwouldteachmeaboutthenaturalworldbutittaughtmemuchmore. OvertheyearsIcametorealizetheimportanceofteamwork.Workingtogethertheantswereabletomakeanamazingworldforthemselves.Ialsolearnedthattheyshouldbeadmired钦佩fortheirhardwork. ButtherewasanevenlargerlessonthatIdidnotrealizeuntilrecentlyAdversity逆境isanaturalpartoflifeandmustbeaccepted.Unliketheantswecannotgiveupwhenwearesad.Wehavetorealizethatifatunnelisgonewemustbuildanother. GivingupIsayisnotagoodchoice. 1.Whatdidthewriter'sfamilydoforhimwhenhewasseven? A.Theymadeanantfarm. B.Theyboughtafewants. C.Theycaughtalotofants. D.Theyfoundanantcity. 2.Whathappenedonthefifthday? A.Theearthquakehappened. B.Thewriterputhisfaceontheground. C.Thewriterknockedtheantfarmover. D.Theantsstartedtomaketunnels. 3.Whatdidthewritercometorealizeafewyearslater? A.Workingtogetherisuseless. B.Teamworkisimportant. C.Adversitycan'tbeaccepted. D.Workingaloneisamazing. 4.Finallythewriterthinksthattheantsdiedbecause. A.theyworkedhard B.thewritermadeamistake C.thetunnelwasgone D.theygaveuwhentheymetdifficulties
﹣Whatdidyoudoafterschoolyesterday? ﹣ItenniswithPaul. A.play B.willplay C.played D.amplaying
某校课外兴趣小组用6g含少量CO2的CO的混合气体还原某二价金属氧化物RO实验实验装置如图数据记录如下表．已知CO还原RO生成金属R和二氧化碳且装置中每个反应都充分进行冷却C装置过程中不考虑金属R重新氧化． 实验记录表 请分析计算 16g混合气体中CO2的质量是克． 2参加反应的CO的质量是多少 3实验结束后对装置C中的10g药品进行测量测得其中R元素的质量分数为92.8%请你求出金属R的相对原子质量
为了测得工业纯碱中碳酸钠的质量分数纯碱中常含少量NaCl小明同学设计的实验装置如图甲准确称取一定量的纯碱样品从分液漏斗中滴入稀硫酸． 1图甲中装置发生的化学方程式为． 2小红觉得小明的实验装置会导致较大的误差故设计了图乙的装置请你写出图乙装置的优势写出两点即可． 3小红用图乙装置进行实验步骤为 ①准确称取盛有碱石灰的干燥管的质量为158.0g再准确称取11.0g纯碱样品并全部放入A中 ②组装全部反应装置并检查气密性关闭d由e逐滴加入稀硫酸至不再产生气泡为止 ③打开d慢慢鼓入空气10min ④再称干燥管的总质量为162.4g． 该产品中碳酸钠的质量分数为若没有B装置而直接通入空气实验最后使得碳酸钠的质量分数填“偏大”“偏小”或“不变”．
西山公园有丰富的负氧离子空气中氧分子得到电子就能形成负氧离子O2﹣．一个O2﹣离子与一个O2分子比较不相同的是
根据使用的需要杠杆可以分为三类下列杠杆中属于省力杠杆的有属于等臂杠杆的有属于费力杠杆的有选填序号1镊子2天平3理发师剪刀4钢丝钳5船桨6铡刀
下列现象中不能用分子间存在引力作用来解释的是
ThejourneymydaughterCathyhashadwithherswimmingisaslongasitisbeautiful. Cathysufferedsometerrible1inherearlychildhood.Afteryearsoftreatmentshefinallybecamehealthy. TwoyearsagowhileCathywaswatchingtheOlympicsadreamcameintohersweetlittlehead﹣tobeaswimmer.Lastsummershewantedto2ourlocalswimmingteam.Shepracticedhardandfinally3it.Theteampracticehoweverwasahardstart.Shecoughedandchokedandcouldhardlypullthroughherfirstfewweeks.HearinghercoughingseriouslyonenightIdecidedto4herfromitall.ButCathywokemeupearlynextmorningwearingherswimsuitreadytogo!Itoldhersheshouldn'tswimafterawholenight'scoughingbutsherefusedto5andinsistedshego. FromthatdayonCathykeptswimminganddidn't6asinglepractice.Shealwaystriedherbesttobethebest.Myten﹣year﹣oldwasgrowingandchangingrightbeforemyeyesintothisdeterminedhumanbeing.Thereweremomentsofsadnessofcourseoftenshewouldbethelastswimmerintherace.ItwasdifficultforCathytoacceptthatshewasn'ta7﹣ever.Butthatdidn'tstopherfromtrying. Thencamethefinalawardsceremony颁奖典礼attheendoftheyear.Cathydidn'texpectanyawardbutwasstilltheretocheerforherfriends.AstheceremonywasnearingtheendIsuddenlyheardtheheadcoachannouncingThehighesthonorgoestoCathy!LookingaroundhecontinuedCathyhasinspireduswithher8andwarmth.9skillsandtalentsbringgreatsuccessthemostvaluableasset财富onecanholdistheheart. Itwasthegreatest10ofmydaughter'slife.Withallshehadbeenthroughinhertenyearsthiswasthehouroftruesuccess. 1.A.failure B.pressure C.illness D.danger 2.A.improve B.train C.contact D.join 3.A.broke B.made C.controlled D.found 4.A.fire B.tell C.hide D.pull 5.A.giveup B.putoff C.takeoff D.showup 6.A.waste B.drop C.miss D.start 7.A.beginner B.winner C.partner D.learner 8.A.spirit B.satisfaction C.relation D.decision 9.A.Since B.Although C.Once D.Because 10.A.change B.training C.moment D.development
itrainedheavilythismorningnobodyinourclassmissedthelessons. A.Though B.Because C.Unless
Somepeopleeatwiththeireyes.Theyprefertoorderwhatnice. A.looks B.smells C.feels
﹣Whydoyoulikebook? ﹣Becauseitisworthreading. A.a B.the C.an
MysisterisinClass2.nameisKate. A.Her B.His C.Your D.Its
用下列简单机械使重量同为的物体都处于静止状态其中用力最大的是均不计摩擦机械自重及绳的重量
大量分子的无规则运动跟有关所以这种无规则运动叫做越高分子的运动越
Intoday'shouseholdswherebothparentsgotoworkandkidshavebusyscheduleswithschoolhomeworkandmanyafternoonactivitiesfindingtimeforagatheringatthetableseemsallbutimpossible.Yetstudieshaveshowntimeandagainthateatingtogetherhaslotsofbenefitsforfamilymembersespeciallychildren. AccordingtoreportsissuedbytheNationalCenteronAddictionandSubstanceAbuseatColumbiaUniversityCASAchildrenwhoeatmorewiththeirfamilyareatlowerriskofdevelopingpooreatinghabitsweightproblemsoralcoholdependencies.Theytendtoperformbetteracademicallythanthosewhofrequentlyeatalone.FamilymealscameintoAmericanlifeinthemid﹣20thcentury.Inthe60'sand70'ssocialeconomicandtechnologicalchangesquicklydissolvedtheshort﹣livedwayoffamilymeals.Restaurantvisitstake﹣outandTVdinnershavesincebecomenormal. Thereareindicatorshoweverthattheoldcustomsarecomingback.AccordingtothelatestCASAreports59%ofsurveyedfamiliessaidtheyatedinertogetheratleastfivetimesaweekasignificantincreasefrom47%in1998.Whateverdrivesthistrenditisadevelopmentthatshouldbewelcomed. Eatingtogetherasafamilyisnotjustaboutfoodandnutrition.Itisaboutteachingthemhowtobecomemembersoftheirsocietyandculture.Foodhasbecomesoeasilyandcheaplyavailablethatwenolongerappreciateitssignificance.Wehavetorediscoveritsimportanceanditsvalue.Sharingamealwithlovedonesshouldbeconsideredaspecialeventwhichcanalmosttakeontheformofaceremonyasitwaspracticedbyourancestorsforwhomfindingfoodwasaconstantstruggle. Ofcoursethereisnoguaranteethatthesimpleactofeatingathomesurroundedbyfamilymaymakechildrenmorevirtuousorsociallymoreresponsible.Butitcanlaythegroundworkforalotofthingsthatpointthemintherightdirection. 1.Whatdoestheunderlinedsentencesuggest? A.Diningathomewouldenjoygreatpopularity. B.Thesocietywastodevelopatafastspeed. C.Thispracticeoffamilymealsstartedtochange. D.Americanswouldattachimportancetotake﹣out. 2.Whatisthewriter'sattitudetowardseatingtogetherasafamily? A.Against. B.Encouraging. C.Neitheragainstnorencouraging. D.Uninterested. 3.Fromthepassagewelearnourancestorspossibly. A.valuedtheeducationofchildren B.likedstrugglingwitheachother C.appreciatedtheimportanceoffood D.caredmuchaboutfoodnutrition 4.Whichofthefollowingcanbethebesttitleforthepassage? A.FamilyDinnersBenefitKids B.GoodEatingHabitsMatter C.MealsTakeonNewMeanings D.OldCustomsAreComingBack
I'dliketogowithyouImustfinishmyhomeworkfirst. A.and B.but C.so D.or
﹣It'smysecondtimetobehere.Ningdealot. ﹣﹣Iagreewithyou.It'scleanerandnicer. A.willchange B.haschanged C.waschanging
﹣TomyousinganEnglishsong? ﹣NoIcan't. A.can B.may C.need D.must
一定条件下甲乙丙丁四种物质在密闭容器中反应测得反应前后各物质的质量分数如图所示下列说法正确的是
2017年7月中国海域天然气水合物﹣“可燃冰”首次试采圆满成功如图取得了持续产气时间最长产气总量最大气流稳定环境安全等多项重大突破性成果创造了产气时长和总量的世界纪录．“可燃冰”是
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