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“联合制碱法”生产过程涉及的主要化学反应如下： Ⅰ．NH3+CO2+H2O═NH4HCO3 Ⅱ．NH4HCO3+NaCl═NH4Cl+NaHCO3↓ Ⅲ.2NaHCO3Na2CO3+H2O+C...
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纯碱Na2CO3属于类物质填酸碱或盐向纯碱的水溶液中滴入酚酞试液试液变色说明纯碱溶液呈性其pH7我国
我国化工专家侯德榜发明了联合制碱法其生产过程中发生的反应主要是①NH3+CO2+H2ONH4HCO3
置换反应
化合反应
分解反应
复分解反应
以下关于氨碱法与联合制碱法的认识不正确的是
氨碱法生产纯碱的原料便宜易得，步骤简单，是最早的制碱工艺
联合制碱法又称侯氏制碱法，是侯德榜在氨碱法的基础上改造形成的
在联合制碱法中，氯化钠的利用率比氨碱法中的高
联合制碱法避免了氨碱法中对氯化钙的处理
氨是一种重要的化工原料在工农业生产中有很多重要应用Ⅰ.工业合成氨的流程示意图如下回答下列问题1设备A
著名化学家侯德榜发明了联合制碱法为我国化学工业的发展作出了杰出贡献．联合制碱法中的碱属于填酸碱盐它
纯碱是一种重要的化工原料目前制碱工业主要有氨碱法和联合制碱法两种工艺请按要求回答问题1氨碱法产生大量
我国化工专家侯德榜发明了联合制碱法其生产过程中发生的反应主要是加热①NH3+CO2+H2O====N
置换反应
化合反应
分解反应
复分解反应
著名化学家侯德榜发明了联合制碱法为我国化学工业的发展作出了杰出贡献．联合制碱法中的碱属于填酸碱或盐它
我国化学家侯德榜于20世纪40年代就成功研制出联合制碱法其生产过程用化学方程式表示为1H2O+NH3
化合反应
分解反应
置换反应
复分解反应
著名化学家侯德榜发明了联合制碱法为我国化学工业的发展作出了杰出贡献．联合制碱法中的碱属于填酸碱盐它的
根据中学课本的介绍下列工业生产过程中不需要使用氨水或氨气的是______
硫酸的工业制法
石油的催化裂化
硝酸的工业制法
联合制碱工业
我国化工专家侯德榜发明了联合制碱法其生产过程中发生的反应主要是①NH3+CO2+H2O====NH4
置换反应
化合反应
分解反应
复分解反应
纯碱是一种重要的化工原料目前制碱工业主要有氨碱法和联合制碱法两种工艺请按要求回答问题1氨碱法产生大量
由我国化工专家侯德榜探索发明的侯氏制碱法其生产过程涉及的主要化学反应如下①NH3+CO2+X====
我国科学家侯德榜创造了一种著名的纯碱生产方法──联合制碱法1联合制碱法生产过程用化学方程式可简要表示
向纯碱的水溶液中滴入酚酞试液试液变色其pH7填=＜或＞我国科学家侯德榜创造了一种著名的纯碱生产方法—
我国科学家侯德榜创造了一种著名的纯碱生产方法—联合制碱法请你回答1纯碱Na2CO3属于类物质填酸碱或
纯碱是一种重要的化工原料目前制碱工业主要有氨碱法和联合制碱法两种工艺请按要求回答问题1氨碱法产生大量
纯碱是一种重要的化工原料目前制碱工业主要有氨碱法和联合制碱法两种工艺请按要求回答问题1氨碱法产生大量
纯碱Na2CO3属于类物质填酸碱或盐向纯碱的水溶液中滴入酚酞试液试液变色说明纯碱溶液呈性其pH7填=
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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. 增加在缺词处加一个漏字符号∧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. Myfatherisapoliceman.Onacoldwintereveninghesawoldbeggarsittinginasquareoutsideashoppingcenter.Hisshoeshadbeenwornoutandhistoesstickout.Seehisfrozenfeetmyfatherfeltsad.Heleftandreturnedbackwithapairofnewshoesandsocksthatheboughtatanearbystore.Hekneltdownonthegroundbuthelpedtheoldhomelessmanputiton.Hisrandomactofkindnessmeltedtheheartsofthepasser﹣by.Awomanbroughtanoldblanketfromherhousetoprotectthebeggarwiththefreezingcold.Thebeggarwastouchedandsaiditwasnicetoknowthatangelstruewalkonearth.
LearntoCiteSources引用资料 Duringyouruniversityeducationyou'llbeexposedtoideasandscientifictheoriesofscholarsandscientists.Unavoidablyyourownideaswillbeshapedbytheideasyoucomeacross.1Thatmeansyoushouldgobeyondwhatyoulearninyourtextbooksorinthelibrary.Youroriginalworkisthebasisforyourprofessor'sevaluationofyourperformance.Thusacademichonestyisfundamentalinyouruniversityeducation.Itdemandsthatyoucitethesourcematerialsyoubaseyourownworkon.2. Correctlycitingyoursourceshelpsyoudistinguishyourownideasfromthoseofotherscholars.Onthereaders'sideitpermitsareadertodeterminethedepthofyourresearch.3Onthecontrarylackofcitingwillonlyraiseyourreader'sdoubt. Soyouneedtolearnwhentociteandhowtoprovideanadequateoraccuratereferencelist.Ifyoufailtociteyoursourceswhetherdeliberatelyorcarelesslyyouwillbefoundresponsibleforplagiarism抄袭.4Ifyouarenotsureaskyourprofessorforguidancebeforesubmittingthepaperorreport.Keepinmindthisgeneralrulewhenindoubtcite! 5ForexamplestudentsfromEastAsiamaythinkthatcopyingdirectlyfromsourcesistheproperwaytodoresearch.StudentsinFrancepreparingforthefinalexaminationmaybeencouragedtomemorizewholepassagesandcopythemintopapers.Thoseculturaldifferencescanleadtofalseassumptionsaboutacademicexpectationsinthecountryyoustudyin. A.Someuniversitystudentsmaycheatindifferentways. B.Theseincludeotherscholars'ideasfiguresgraphsandsoon. C.Theacademicchallengeyoufaceistomakesomethingoriginal. D.Oftenstudentswanttouseothers'opinionstosupporttheirownessays. E.Italsoallowsareadertoappreciateyouroriginalcontributiontotheresearch. F.Forinternationalstudentsitisimportanttoknowlocalacademicexpectations. G.Notknowingacademicregulationsisanunacceptableexcuseforsuchbehavior.
若代数式在实数范围内有意义则实数a的取值范围为
计算﹣＝．
15分CalligraphytheartofwritingwasthevisualartformprizedaboveallothersintraditionalChina.Paintingwascontemporarywithcalligraphysharing1sametools﹣namelybrushandink.Yetcalligraphywasregarded2afineartlongbeforepainting. ThestatusofcalligraphyreflectstheimportanceofthewordinChina.3makesthewrittenwordsdistinctiveisitsvisualform.Howeverdespiteitsabstract4appearcalligraphyisnotanabstractform.Chinesecharactersaredynamiccloselyconnectedwiththeforcesofnatureandthekinesthetic运动energiesofthehumanbody. Howcanasimplecharacterconveyallthis?Theuseofbrushandink5havemuchtodowithit.Acalligraphercancontrolthe6thickoftheinkbyvaryingboththeamountofwaterandthesolidink.Oncehestartswritingbyloadingthebrushsometimeswith7muchinkorsometimeswithlesshecreatescharactersthatresembleashowerofrockshereandadropofdew露珠there. TheChinesewrittenlanguage8begintodevelopmorethan3000yearsagoand9eventualevolvedintofivebasicscripttypes.Overthecenturiescalligrapherswerefreetowriteinanyofthem10dependonthetext'sfunction.Thecalligraphictraditionremainsalivetoday.
下列图形中是轴对称图形但不是中心对称图形的是
25分假定你是李华你们学校的英国交换生Jeff准备参加外国人讲中国成语idiom故事比赛他发邮件请你给予辅导.你回复邮件内容包括 1.答应帮助 2.提出建议 3.询问辅导时间与地点. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯. DearJeff Yours LiHua
如图在平行四边形ABCD中点EF分别是边ABCD上一点将平行四边形ABCD沿EF折叠得到边形EFGC点A的对应点为点C点D的对应点为点G．若∠AEF＝50°∠D＝40°则∠FCG的度数是
30分AfriendwascastinTheSoundofMusic.Timsuggestedourdaughtersmightenjoybeinga1ofthemusical. Youcantryoutforthebandhesaid. NoI'mtryingoutfortheshow.Ianswered.Buttherewasoneproblemwithmy2I'dneverbeeninamusical.AndI'dneversung3. Mydaughterswantedto4sowememorizedshowtunesandpreparedtoaudition试镜.Asouraudition5Ifeltnervousandwantedtogiveup.ButIknew6wouldsetabadexample. Whetheryou're7ornotisn'timportant﹣doingyourbestiswho8I'dbeentellingthem.NowIhadtoliveit. Iwalkedintotheaudition.TosayIwas9wouldbeanunderstatement.Afterallmylastauditionhadbeeninhighschool.Isangmysongtryingtolookconfident.Mydaughtersdidagood10.Thenwewaitedfortheresult.Thegoodnewsisthatweall11it!NotonlywasIcast﹣Iwasalead! ToprepareI12tothecattheshowerandthedisheswhenaloneIknewI'dhavetogetovermy13ofperforminginpublic.Afterallthis'dbemyfirsttimetosinginpublic.Iwasalittlenervous. Itoldfriendsandfamilyaboutthe14.Ididn'twantthetheatertobe15butIdidn'tnecessarilywantitpackedeither.16ifitwerefullIpreferredtofillitmyselfwith17faces. Theshowwassuccessful.Friendsandacquaintancesall18us.AfterthatexperienceI19moreauditionsandevenlearnedtoenjoysingingonstage.AndIfilledmylifewiththesoundof20. 1A.director B.maker C.role D.singer 2A.declaration B.suggestion C.judgment D.production 3A.secretly B.loudly C.irresponsibly D.publicly 4A.tryout B.catchon C.tryon D.setoff 5A.ended B.approached C.failed D.continued 6A.lying B.quitting C.cheating D.talking 7A.found B.paid C.cast D.forgiven 8A.matters B.remains C.happens D.works 9A.happy B.curious C.nervous D.disappointed 10A.favor B.job C.deed D.survey 11A.got B.made C.caught D.reached 12A.spoke B.smiled C.danced D.sang 13A.laziness B.urge C.shortcoming D.fear 14A.show B.trouble C.band D.experience 15A.large B.noisy C.empty D.quiet 16A.Besides B.Therefore C.Anyhow D.However 17A.new B.attractive C.friendly D.similar 18A.welcomed B.noticed C.supported D.congratulated 19A.organize B.braved C.watched D.analyzing 20A.music B.life C.hope D.future
8分IvisitedElbalastJunejoiningMaryandJohnonabicyclingvacation.Theymadethearrangementsforthecarhotelandbicycles.IstudiedthehistoryoftheislandwhichofcourseparticularlyfeaturesNapoleon. NapoleonnowIknowpickedElbaasaplaceforpeacewhenhewasforcedtogiveupthethrone王权asEmperorofFrancein1814.FarfrombeingaprisonislandElbaisbeautifulwithtoweringmountainsthickforestsandsweepingbaysandbeaches. Itisalsoanislandfilledwithtreasure.Veryearlyonthisislandlocalsdiscoveredrichdepositsofiron.Soonoutsiderstoodiscoveredtheironand150othervaluablemineralsonthislittlepieceofland.LongbeforeEtruscansandotherGreekssetfootonitDorianshadmovedinbythetenthcenturyB.C.andwereminingtheisland.TheRomansrulednextobtainingthemineralsandbuildinggrandhousesoverlookingthesea.FromthetwelfthcenturyuntilthenineteenththeislandwastradedbackandforthandwaspassedtoFrancein1802.ThencameNapoleonthenewrulerofElba. IwaseagertovisithishouseinPortoferraio.TheEmperorlivedwithhiscourtandhismotherbuthiswifeMarieLouisehadensconcedherselfinthesplendidViennesepalaceofherfatherEmperorofAustria.Shelivedsafelythereandshowedlittleinterestinvisitingherhusbandinhismini﹣kingdom.ApparentlyNapoleonwasn'ttroubledmuchbythis.Hewastoobusyridingeverywhereonhorsebackbuildingroadsmodernizingagricultureandaboveallsharpeninghistinyarmyandnavyintoreadinessforhisescape. IntheformalgardensbehindthehouseitseemedtomethatIcouldimaginetheexiled流放的conqueror'sanxiousthoughts.HemightgazeoverwhereIstoodnowtowardthelighthouseoftheStellafortthesandybayandacrossitthegreenmountainsoftheTuscancoast.NapoleonspentonlytenmonthsherebeforemakinghisvictoriousreturntoFranceandthethrone. 1WhatdidtheauthordoforthevisittoElba? A.Hedidresearchonitspast. B.Hearrangedtransportation. C.Heplannedbicyclingroutes. D.Hebookedaccommodation. 2WhomightbetheearliestoutsiderstoElbaaccordingtothetext? A.Napoleonandhisarmy. B.EtruscansandotherGreeks. C.Dorians. D.Romans. 3Whatdoestheunderlinedwordensconcedprobablymean? A.Settled. B.Locked. C.Cured. D.Controlled. 4Whatcametotheauthor'smindduringhisvisittoNapoleon'sgardens? A.BeautifulviewsonElba. B.TerriblelivingconditionsonElba. C.Napoleon'sambitiontoregainpower. D.HardshipofNapoleon'sreturntoFrance.
10分ThreeinfivepeopleintheUKholdalibrarycard.Forsomethey'reashelterfromthestressesofday﹣to﹣daylife.1Ifyou'reconsideringjoiningyourlocallibrarynowisthetimetodoso.Andifyouneedanymoreencouragementhereareseveralreasonswhyyoushould. MostlibrariesintheUKallowmembersofthegeneralpublictocomeandgoastheylike.2Youcanalsotakeoutalibrarycardandborrowbooksforfreealthoughyouwillinevitablyfaceafineforlatereturns. 3Imaginejusthowmanybooksyouhaveatyourfingertipswithalibrarycard?Therearelotsofmodernonesaswellasoriginalsandyoucancontinuetoexpandyourlearningandvocabularyallthetime.It'sapricelessexperienceespeciallyforkidsandalsoagreatwaytoleveltheeducationalplayingfield. Librariesdevelopwithtimes.Theyhavechangedgreatlysincedecadesago.4Somelibrarieshaveappssoyoucanseewhenyourbooksareduebackandevenreservebooksinsomecases.Therearealsolibrarieswhichletyouaccessbooksindigitalformatsonyourmobiledevice﹣prettycool. Librariesareoneofveryfewspacesleftintownsandcitieswheremembersofthepubliccancometogetherandactuallybeandfeellikeacommunity.Theyhavenoticeboardstoofferserviceslikeexerciseclassesorlearningcenters.5. A.Librarieshelppeoplelearn. B.Librarieshelpeducatethekids. C.Theycreateagreatsenseofcommunity. D.Youcangoinsettledownandreadabookwithoutbeingchargedapenny. E.MostlibrariesnowhavecomputersandallowpeopletoborrowCDsandDVDs. F.Librarieshelpussavemoneyaswe'reborrowingbooksratherthanbuyingthem. G.Forothersparticularlythehomelessandpeopleinpovertyalifelinetotheworld.
8分Whenreturningtosouth﹣westernGermanywheremyparentsliveitiscompulsoryformetogoonahiketoconnectwithnatureandreconnectwithmyself.SothatisexactlywhatIdidthefirstsunnySundaybackinthebeautifulBlackForest.TheHuzenbacherSeeisatarninthemiddleofthenorthernBlackForestwithabundantnaturesurroundingit.ApproachingitafteragoodhourwalkIsawfascinatingbluedragonfliesinquantitythatattractedusbythewaytheyflewaround.Theydidn'tstandstillforaphotoastheylandedonleavesforasplitsecond.WewerealsosurprisedattheyellowwaterliliesthatcanbeseenfloatingonitssurfacebetweenJuneandJuly. Sittingdownatoneofthebenchessurroundingthelakeforapicnicwassatisfyingintwoways.Iwasawareoftheworld'sbeautythatgavemetheenergytocontinueupthemountaintoreachthemostamazingviewlookingoverthelake.Theotherwastoreallyfillmyselfupinordertocontinuetheadventureadequatelyfulluponsomesnacksandrefreshingwaterfromthewell. Thehikeupwasn'tashardasexpectedandagoodpathwasprovidedwithdirtyrocksandslipperystonesallundertheshadeofthetalltrees.Thistookaboutanhourandahalfuntilreachingthebeautifulviewofthelakeandlandbelow.Oncewehadtakenintheastonishingviewsthewalkbackdowntookanotherhourorsomakingthehikea3﹣to4﹣hourroundtripwhichwaswellworthit! SimplybeingbackintheBlackForestandhavingsuchpleasanthikesisdefinitelygoodforthesoulandIhighlyrecommendgettingyourselfoutsidebeitintheBlackForestoranywhereoutdoors.GetyourintakeofvitaminDandmostimportantlytakeinthemomentsthatnaturehastooffer. 1WhatdoestheunderlinedwordtarninparagraphIreferto? A.Tree. B.Tower. C.Lake D.Village. 2Howdidtheauthorfeelwhensittingonthebench? A.Tired. B.Content. C.Surprised. D.Excited. 3Whatdidtheauthorcallonpeopletodo? A.TakevitaminDpills. B.Loveandprotectnature. C.Savethesoulandbeyourself. D.Gooutdoorsandgetclosetonature. 4AccordingtotheauthorbeingbackintheBlackForestandhavingpleasanthikesdoesgoodtoone's. A.health B.spirit C.character D.experience
25分假定你是李华你校英国交换生John想利用假期到中国各地旅游发邮件向你询问如何购买火车票.请你回复邮件内容包括 1.所需证件护照 2.购票方式售票窗口网上 3.车站取票. 注意1.词数100左右 2.可以适当增加细节以使行文连贯. DearJohn ﹣﹣﹣﹣ Yours LiHua
如图在每个小正方形的边长均为1的方格纸中有线段AB和线段CD点ABCD均在小正方形的顶点上． 1在方格纸中画出以AB为斜边的等腰直角三角形ABE点E在小正方形的顶点上 2在方格纸中画出以CD为对角线的矩形CMDNCMDN按顺时针排列且面积为10点MN均在小正方形的顶点上 3连接ME并直接写出EM的长．
40分Ahumpbackwhaleisstrugglinghardinthesea.Thehumpbackscanweigh40tonsandstretch50feelfromnosetotail.That'sthekindof1andsizethateasilyoverturnsmallboats.Tojumpontothe2ofoneofthesegiantsis3toresultinadisaster.Butthat'sjustwhatSamSynsleliendidwhenhesawahumpback4caughtinaropethatwas5toabuoy浮标inCentralCaliforniansMorroBaythisweek. SamalongwithcrewmateNicholasTaronhadalreadytried6theunfortunatewhaletotheU.S.CoastGuard一buttheyweretolditwouldbehoursbefore7couldbesent.8thecommercialfishermen9thiswhaledidn'thave.Ifthewhalewasto10theyhadtogogetit.Therewasnoother11forthewhale.Theydecidedtogoforittotally12thefear.Turon's13intherescuewasmostlyinthe14cheeringdepartment.Intheclipyoucanhearhimdirectingtheoperationfromthesideoftheboatwhilefilmingtheentire15. Swim!Swim!HeyellsMove!Justgetit!Getit! Theanxiouswhalewasjustswimmingincounter﹣clockwisecircles16andbeingheldtothebottom.Itthrewitsheavytailagainsttheboat.ButSam17itandjumpedontothewhale'sbacktosaveitslife.Hemanagedtohanginthere18cuttingthroughtheropethat19thecreature.Andthenwithawhoosh击水声itdovedeepdownbeneaththegreat20.Itwasn'tmuchofathankyoubutSynstelienandTaronwereleftwithawhaleofatale. 1A.length B.violence C.ability D.weight 2A.nose B.head C.back D.tail 3A.willing B.likely C.anxious D.flexible 4A.hopelessly B.loosely C.curiously D.secretly 5A.stuck B.directed C.adjusted D.attached 6A.shipping B.delivering C.reporting D.hunting 7A.boats B.rescuers C.fishermen D.experts 8A.Strength B.Advantages C.Patience D.Hours 9A.figured B.objected C.hesitated D.proved 10A.paddle B.survive C.relax D.breathe 11A.barrier B.accommodation C.option D.equipment 12A.hiding B.exhibiting C.fostering D.ignoring 13A.interest B.ambition C.role D.contribution 14A.disturbing B.enthusiastic C.clumsy D.scared 15A.operation B.creature C.performance D.fighting 16A.silent B.stressed C.confused D.unconscious 17A.wrestled B.spotted C.trained D.approached 18A.eventually B.naturally C.directly D.normally 19A.prohibited B.injured C.tied D.monitored 20A.waves B.noises C.ferry D.darkness
如图△ACD内接于⊙OCB垂直于过点D的切线垂足为B．已知⊙O的半径为BC＝3那么sin∠A＝
在平面直角坐标系中抛物线C1y＝ax2+4x+4a0＜a＜2． 1探究与猜想若A1yaB0ybC﹣1yc三点均在C1上连接BC作AE∥BC交抛物线C1于E． ①探究取a＝1则点E的坐标为． ②猜想当a值变化时E点总在直线上验证你的猜想． 2如图2若a＝1将抛物线C1先向右平移3个单位再向下平移4个单位得到抛物线C2C2交x轴于M交y轴于N直线y＝kx﹣9交抛物线C2于PQ当PM∥QN时求k的值．
已知如图CD⊥AB垂足为D点F是BC上的一点FE⊥AB垂足为E且∠1＝∠2求证DG∥BC．
12分About6yearsagoIwasonaplanenexttoawoman.Iwastiredandwantedtotakeanap.ButbeforeIcouldgointoignorepatternshetappedmeontheshouldertointroduceherself. HimynameisHelga! WegottotalkingandeventuallyitcameupthatIhadstartedanorganizationinhighschoolcalledR.A.K.E.RandomActsofKindnessEtc..AsIdescribedwhatwedidHelgagotveryseriousandtoldmethatsheadmiredmeforthat.Shetoldmeastoryaboutthelasttimeshehadflown.ShewasonthewaytoArizonabecauseshehadgottensuddennewsthatherdad'shealthwasonthedecline.Laterherfather'sphysiciancalledtoinformherthatherdadhadrathersuddenlypassedaway.Forthe3﹣hourplanerideshesatinsilencearoundstrangers. WhenshearrivedattheairportinArizonashewalkedtothenearestwallsatdownandcried.AndhereisthepartI'llneverforgetaboutHelga'sstory.For2hoursshesatandweptwhilethousandswalkedtoandfrointheairport.HelgalookedalmeandsaidHoustonnotasinglepersonstoppedandaskedifIwasokaythatday.ItwasthatdaythatIrealizedhowmuchweneedeachother.ItwasthatdayIrealizedthatkindnessisn'tnormal. Kindnessisn'tnormal.Thathasstuckwithmealltheseyearsespeciallynow.Iworkinschoolsnationwidespeakingaboutsympathykindnessempathy同理心andlove.I'mremindedallthetimethatformanyofuskindnessisnotusuallyourdefaultsetting.Wespendsomuchtimeworryingaboutourproblemsourlivesourinsecuritiesgettingtoourflightsowewalkbyorignorepeopleinneedofhelp. SoI'vemadeitmymissiontodomypartinsharingstorieswithstudentsteachersandparentsaboutourneedforcharacterandsympathy.I'malwaysbeonthelookoutforthelittleopportunitiesthatsurroundmeeverydaytodosomethingnice. 1WhatimpressedtheauthormostaboutHelga'sstory? A.Helga'sanxietyoverherfather'ssuddenillness. B.HelgahadnoonetotalktoonherflightloArizona. C.Helgawasignoredbypeoplearoundherwhenshecried. D.Helgacouldn'tgetoverhersadnessoverherFather'sdeath. 2Whichcanbestexplaintheunderlinedpartdefaultsettinginparagraph5? A.Usualwayofdoingthings. B.Unexpectedwaytodothings. C.Ignorancetopeoplearound. D.Biggestsurprisetoothers. 3Whatcanweknowabouttheauthor? A.Hestartedmanyclubsinhighschool. B.Heusedtobeaschoolteacher. C.Heteacheskidshowtobehavewell. D.Heisapromoterofagoodcause. 4Whatcanbeasuitabletitleforthetext? A.ComfortingPeopleinNeed B.MakingKindnessNormal C.IgnoringUnnecessaryTroubles D.PractisingKindnessonthePlane
已知ab满足方程组则a+b的值为
15分TheForbiddenCityinBeijinghometothePalaceMuseumhousesmorethan1.8millionculturalrelicsandisoneoftheworld'smostvisitedtouristattractions. 1markthe600thanniversaryoftheForbiddenCitythePalaceMuseumwillholdaseriesofeventsthroughout2020.Over20exhibitionswillbeheld2coverdifferentareassuchashistoryartfestivalsandsoon.ForthespecialoccasionAlongtheRiverduringtheQingmingFestivaloneofChina'smost3wideknownmasterpieceswillgoondisplayinSeptember2020.For4itbestpreservationthistreasuredartworkisseldomfullyexhibited.Thepainting5displayforthefirsttimebackin2005tocelebratethemuseum's80thanniversary.Such6raresightisexpectedtodrawhugecrowds.Inadditionthemuseumwillalsodisplayexhibitsfromother7country. DuringthepastfewyearsthePalaceMuseumhasbeenworkinghardtogetthepublicfamiliar8thehistoryandcultureoftheForbiddenCity.Anditseemsthattheseeffortshavebeenpayingoffwithits9popularreachinganewheight.Over17millionpeoplevisitedthemuseumin2018of1040percentwereunder30yearsold.
已知EF分别是矩形ABCD的边ADCD上一点且DF＝CF∠DEF＝2∠CBF．若AB＝4BC＝6则AE＝．
为迎接军运会市政府准备采购若干套健身器材免费提供给社区经考察某体育器材公司有AB两种型号的健身器可供选择． 1体育器材公司2017年每套A型健身器的售价为2.5万元经过连续两年降价2019年每套售价为1.6万元求每套A型健身器年平均下降率n 22019年市政府经过招标决定年内采购并安装劲松公司AB两种型号的健身器材共80套采购专项费总计不超过112万元不少于110万元．采购合同规定每套A型健身器售价为1.6万元每套B型健身器售价为1.51﹣n万元． ①有几种采购方案 ②安装完成后若每套A型和B型健身器一年的养护费分别是购买价的a%5≤a≤8和10%．市政府计划支出W万元进行养护．问每年养护费的最低费用为多少
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.错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧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. WhenIwaseightmyfatherboughtmethenewbikeformybirthday.Mybrotherofferedtoteachmehowtoride.Atfirsttheyrodeandletmewatching.Thenheexplainedmetheskillsofcontrollingthebike.StillpuzzlingIgotonthebikebutitdoesn'tmoveasexpected.Ilostmybalanceandfalloffthebike.AtonceIburstintotearbecauseIsawbloodontheground.WhileIstoodupmyleftleghurtbad.LaterIlearnedtorideabike.Butthisexperiencetoldmethatthoughsomelessonswerepainfultolearnthemyetwecouldbenefitalot.
8分Coca﹣Colawhichreportedlyproducedmorethan3milliontonsofplasticpackagingin2017announcedThursdayitwantstohelpfixtheworld'splasticwasteproblemonecommunity社区atatime. Thesodagiantisdoingsobyproviding＄5.4millionforrecyclingprogramsincitieslikeAtlantaBostonDenverandHouston.InthesecitiespartnerslikeTheGreenBlueInstituteandTheRecyclingPartnershipwhichreceivethemoneywillworktogethertoimproverecyclingrates. WefocusonareaswherewehavetheabilitytomakethebiggestinfluenceoncommunitiesthroughthefundingandexpertskillsofCoca﹣ColaemployeesCarlosPagoagoaCoca﹣Cola'sgroupdirectorofcommunitypartnershipssaidinastatement.Ineachcitylocalpartnerswillworktogethertoidentifybarrierstorecyclingonalocallevelandtestarangeofsolutionsheadded.Wehopethelearningsfromthese‘modelmarkets'canoffersolutionstoothercitiesfacingsimilarchallenges. AspartoftheeffortTheRecyclingPartnershipandthecityofAtlantawherethecolacompany'sheadquartersarebasedwillsendstreetteamsouttoopenrecyclingcartsandleavecitizenscardsinformingthemwhattheycanandcan'trecycleandletthemknowhowtheireffortswork. TwoofthemosturgentproblemswithrecyclingintheU.S.todayarelackofaccessfollowedbypollutioninrecyclingKeefeHarrisonCEOofTheRecyclingPartnershipsaidinastatement.WeknowfromthesuccessofAtlantain2017thatthecitizenswanttorecycleandthatcommunicatingwiththeminthestreetworks. LastyearCoca﹣Colaannounceditstasktocollectandreuseabottleorcanforeachoneitsellsandincreasetheamountofitsproductsoutofrecycledmaterialsto50%by2030.Thebrandalsoaimstomakeallitspackagingfullyrecyclableby2025. 1WhatdoesCoca﹣Colacompanyintendtodointheprogram? A.Producelesspackaging. B.Helpdealwithplasticwaste. C.Pickupwasteincommunities. D.Buildaplanttorecycleplasticwaste. 2What'sParagraph2mainlyabout? A.HowCoca﹣Colaconductsitsprogram. B.Whatorganizationsparticipateintheprogram. C.HowCoca﹣Colachoosescitiesfortheprogram. D.WhatthelocalpeopledoinCoca﹣Cola'sprogram. 3Whatdostreetteamsdotohelp? A.Sortoutvariouswasteinthecity. B.Lookintothecauseofpollution. C.Instructlocalpeoplewhattorecycle. D.Handcardstothelocalsinperson. 4WhatdoesKeefeHarrisonthinkoftheprogram? A.Promising. B.Difficult. C.Pioneering. D.Costly.
观察下列一组数1……根据这组数的排列规律若第n个数的值为则n的值为
12分Three﹣quartersoftheworld'scoffeefarmsdestroyforesthabitattogrowcoffeeinthesunandtypicallyuseharmfulpesticides杀虫剂andchemicalsthatpoisontheenvironment.Whenforestsdisappearmigratory迁徙的songbirdsdisappeartoo.InordertodealwithseverepopulationandhabitatlossSmithsonianscientistscreatedtheBirdFriendlycertification. BirdFriendlycoffeesareshade﹣grownmeaningthecoffeeisplantedundertreesratherthanonthelandthathasbeenclearedofallotherplants.Coffeeexpertssayshade﹣growncoffeestastebetterbecausethebeansripenslowerthancoffeegrowninthefullsunresultinginarichermorecomplexflavor.BirdFriendlycertifiedcoffeesgrowunderbio﹣diverseshadethatprovideshabitatformigratorysongbirdsandotherwildlifestorescarbonandfightsclimatechange.BirdFriendlycoffeesarealsocertifiedorganicmeaningtheyaregrownwithoutpesticideswhichisbetterforpeopleandfortheplanet. BirdFriendlyproducerscanalsoearnmorefortheircrops.Thewoodandfruittreesonshadecoffeefarmsprovidefarmerswithadditionalincome.EverycupofBirdFriendlycoffeepurchasedrewardsthesefarmerswithalittlemoremoneyforbeinggoodstewardsoftheenvironmentandencouragesthemtocontinueconservingBirdFriendlyhabitat. BuyingBirdFriendlysupportstheSmithsonianMigratoryBirdCenter'sconservationresearchaimedatunderstandingandprotectingyourfeatheredfriends.YoucanpurchaseBirdFriendlycertifiedcoffeesaroundtheworldandprotectwildlifeandhabitatwitheverycup.Findastoreorcafenearyouorbetteryethaveitshippedtoyourdoorwhenyouorderonline. 1Whatisthepresentsituationofcoffeefarms? A.Onefourthofthemhavedestroyedforesthabitatforbirds. B.Pesticidesandchemicalsusedonthempoisonedmanybirds. C.Farmershavebeenawareofenvironmentprotection. D.Scientistspayattentiontothemandhavecomeupwithanidea. 2What'sacharacteristicofBirdFriendlycoffees? A.Theymayhaveabettertaste. B.Theyhaveastrangeflavor. C.Theytakelesstimetoripen. D.Theyaregrownonunpollutedland. 3HowcanBirdFriendlyfarmersearnmoremoney? A.Bychargingconsumersmoremoney. B.Bysellingfruitsandwoodfromtrees. C.Bycuttingdowntreesandsellingwood. D.Byservingasstewardsofcoffeeconsumers. 4Whatdoesthetextsuggestcoffeeconsumersdo? A.Consumelesscoffee. B.Ordercoffeeonline. C.Purchaseshade﹣growncoffee. D.Donatetocoffeefarmers.
SmartKidsFestivalEvents SmartKidsisacollectionofonehundredeventsscheduledinOctober.ThisyearitisexperimentingwithPayWhatYouDecidePWYD.Thatisyoucandecidetopaywhatyouwanttoorcanaffordafteryouhaveattendedanevent.Youcanpre﹣bookeventswithoutpayingforaticketinadvance.Herearesomeofthedirector'spicks. WalkontheWildSide NotticketedFree JoinstorytellerSarahLawtohearsciencestoriesaboutanimals.Alongthewayyou'llmeetallsortsofbeautifulcreaturesanddiscoverlifecyclesandfoodchains.Bestsuitedtochildrenaged5﹣9.Childrenunder8mustbeaccompaniedbyanadult. IntroductiontoWaves Pre﹣bookPWYD Subjectsrangefromsoundwavestogravitywavesandfromwavesoflighttocrashingwavesontheocean.MikeGoldsmithexploresthefundamentalfeaturessharedbyallwavesinthenaturalworld. ScienceintheField NotticketedFree Thisstorytellingnightfeaturesascientistsharinghisfavouritememoriesofgatheringfirst﹣handdataonvariousfieldtrips.Comealongforinspiringandinformativestoriesstraightfromthescientist'smouth.JoinMarkSamuelstofindoutmoreinthisfun﹣filledworkshop. FestivalDinner Pre﹣book£25perperson WhetheryouwanttoexploremoreaboutfoodorjustfancyatalkoveramealjoinustomarkthefirstsciencefestivalinLondon.Whichfoodsshouldyoueattotrickyourbrainintothinkingthatyouarefull?FindoutmorefromTomCrawford. 1Inwhicheventcanyoudecidethepayment? A.WalkontheWildSide B.IntroductiontoWaves C.ScienceintheField D.FestivalDinner 2Whowilltalkaboutexperiencesofcollectingdirectdata? A.SarahLaw. B.MikeGoldsmith. C.MarkSamuels. D.TomCrawford. 3Whatdothefoureventshaveincommon? A.Family﹣based. B.Science﹣themed. C.Pickedbychildren. D.Filledwithadventures.
8分StudyingtheDNAof300micehasflaggedupgeneswhichhavebeenlinkedtohereditary遗传的sightlossforthefirsttime.Researcherssaybecausemice'sgenesaresosimilartohumans'theirfindingscouldleadtothetreatmentofmoregeneticdiseases. ScientistsattheUniversityofCaliforniaDavisstudiedinformationfromadatabankofmice'sgeneticmaterial.Theyfound347geneslinkedtoeyeproblemswithjust86ofthemhavingbeenstudiedinthepast. Onlyaround50to75percentofhereditaryeyediseasesinhumancanbeexplainedwithpresentscience.Theresearchersbelievethesehundredsofnewgenesfoundinmicecouldbeakeytoexplaining﹣andthereforebeingabletotreattheother25﹣50percent. ThisisextremelyvaluableforpeoplewithhereditaryeyediseasesaidresearcherProfessorAlaMoshiri.Allresearchersaregoingtostartusingthesedata.Inthepastweknewtheproblemwastherebutwedidn'tknowwheretolook.Noweyecenterscancallbackpatientsandscreenthemforthesenewgenes.Weexpectedthatmoreandmoreofthesegeneticdiseaseswillbetreatable.Alsothefactisthatmorethan60percentofeyeproblemsatbirthareonesresultingfromthebaby'sparents! ThankstodatafromtheInternationalMousePhenotypingConsortiumIMPCwhichistryingtoworkoutwhateverysinglegeneinamouseisresponsibleforwiththeaimoftranslatingittohumansscientistsaremovingclosertofiguringoutallgeneticcausesofblindness.Todothisscientistsseparateasinglegenefromotheronesatatimeandthenobservewhateffectithasonthemouseforalongtime.Thishassofarbeendonemorethan7000timesandhasachievedgreatsuccess.ResearchersarenowworkingalongsideeyecarecentersinTexasandIowainordertocomparethemice'sgenestothoseofpatients. 1Howmanyhereditary﹣sight﹣loss﹣relatedgeneswerenewlyfound? A.86. B.261. C.300. D.347. 2Whyisthepercentageofgeneticeyeproblemsmentionedinparagraph3? A.Toshowthesignificanceofstudyingmice'sgenes. B.Toprovemice'sgenesaresimilartohumans'. C.Towarnthehighrisklevelofsufferingthem. D.Toexplainhowcommontheyareamongpeople. 3Whatshouldscientistsdofirsttounlocksecretsofgeneticblindness? A.Comparehumans'geneswithmice's. B.Recognizeeachgene'sroleofhumans. C.Setapartageneofamouseeachtime. D.Figureouteachgene'sfunctionofamouse. 4Whatcanbeasuitabletitleforthetext? A.NewWaystoCureSightLoss B.GenesFoundBehindEyeProblems C.GeneticDiseasesDiscoveredinMice D.HumansGenesCausingEyeDiseases
LiveatLeedsFestivalUnitedKingdom AweekendofIndiemusictakingoverLeedsforonedayinMayMetronomySunaraKarmaandTomGrennanwillheadlinebutthere'safocusonthecity'snewerbandswiththefestivalaimingtobringnewartistsintothespotlight.Eventstakeplaceacrossthecitywithwristbandsgivingyouaccesstoalltheplaces.Andtogotothisfestivalyouneedtobeover14yearsold. Time4May2019 MidnightSunFilmFestivalFinland AlmostahundredmilesnorthoftheArcticCircleSodankylaiswhereFinnishfilm﹣directorbrothersAkiandMikaKaurismakirockupeverysummerfortheirMidnightSunFilmFestivalafive﹣day﹣and﹣nightcelebrationofnewcinema.AmixofsilentfilmscontemporaryFinnishonesrecentfestivalhitsandbox﹣officeclassicsarescreenedaroundtheclock. Time12﹣16June2019 FujiRockFestivalJapan ThefirsteverFujiRockFestivalwasheldatthebottomofMountFujibackin1997andhasbroughtinmusicandrockfansfromallovertheworld.ThefestivalisnowheldintheNaebaSkiResortandiscelebratingits20thanniversarythisyear.Theartistswhoperformaren'tallrockers.Yourwristbandhastobecheckedattheentrance.Weofferfacilitiesforchildrenbuttheycan'tbeleftunaccompanied. Time26﹣28July2019 TheWhiteNightsFestivalSt.PetersburgRussia TheWhiteNightsFestivalisheldatthecity'sfamousMariinskyTheatreandshowssomeoftheworld'sbestoperaandballet.It'sthebesttimetovisitSt.Petersburgbecauseit'sheldduringthemagicalsummerperiodwhenthere'salmost24hoursofsunlightaday. Time23May﹣2June2019 1Whichfestivallaststhelongesttime? A.LiveatLeedsFestival. B.MidnightSunFilmFestival. C.FujiRockFestival. D.TheWhiteNightsFestival. 2Wherewillyouenjoya24﹣hourmovieactivity? A.InLeedsUnitedKingdom. B.InSodankylaFinland. C.IntheNaebaSkiResortJapan. D.InSt.PetersburgRussia. 3WhatdoLiveatLeedsFestivalandFujiRockFestivalhaveincommon? A.Theyareofthesamemusicstyle. B.Theyfocusonnewartists. C.Theyrequireentrancewristbands. D.Theyhaveagelimits.
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