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同学们用如图所示装置进行实验，验证CO2与NaOH、Ca（OH）2都能发生反应．分别向甲、乙两个瓶中注入少量、等体积的两种溶液，观察实验现象． （1）甲中反应的化学方程式是 ．说明CO2能与...
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如图所示是同学们在学习液体的压强时进行的交流活动同学们的交流属于科学探究中
提出问题
猜想与假设
设计实验
进行实验的：
在实验探究课上同学们积极思考共设计出如图所示四种实验方案用以验证浓硫酸的吸水性其中在理论上可行的是
①②③④
①②③
①③④
②③④
化学反应过程中常常伴随产生一些现象同学们发现将CO2通入NaOH溶液时没有明显的现象发生为此他们进行
同学们在实验室中发现一瓶如图所示久置的瓶口有白色固体瓶塞丢失的无色溶液已知原溶液可能是NaClNaO
在探究电流与电压关系的实验中同学们进行了交流与合作.1如图所示同学们在交流中提出甲乙两个探究思路请对
某活动课程小组拟用50mLNaOH溶液吸收CO2气体制备Na2CO3溶液为了防止通入的CO2气体过量
【发现问题】研究性学习小组中的小张同学在学习中发现通常检验CO2用饱和石灰水吸收用浓NaOH溶液【实
学习探究小组中的小明同学在学习中发现通常用饱和石灰水检验CO2用浓NaOH溶液吸收CO2针对这一发现
潜水员使用的供氧装置是用过氧化钠Na2O2和呼出的CO2反应来制取氧气提供呼吸某实验小组为验证这一原
潜水员使用的供氧装置是用过氧化钠Na2O.2和呼出的CO2反应来制取氧气提供呼吸.某实验小组为验证这
如图所示是同学们在学习液体的压强时进行的交流活动同学们的交流属于科学探究中
提出问题
猜想与假设
设计实验
进行实验的：
【发现问题】研究性学习小组的小张同学在学习中发现通常检验CO2用饱和石灰水吸收CO2用浓NaOH溶液
同学们在实验室中发现一瓶如图所示久置的瓶口有白色固体瓶塞丢失的无色溶液已知原溶液可能是NaClNaO
2014·德州如图所示漫画描绘的是猴子和兔子分萝卜的情景.究竟谁分得的萝卜重德州市育红中学的三位同学
同学们在实验室中发现一瓶如图所示久置的瓶口有白色固体瓶塞丢失的无色溶液已知原溶液可能是NaClNaO
用下列装置进行实验不能达到实验目的是
干燥 CO2
收集 O2
验证 CO2 性质
监控气体流速
某同学用如图一所示的装置来探究CO2SO2与澄清石灰水的反应结果通入CO2可以看到先浑浊后澄清的现象
某班同学在实验室选用下图装置进行CO2的制取和验证性质的分组实验1实验室制取和收集CO2应该选择装置
潜水员使用的供氧装置是用过氧化钠Na2O.2和呼出的CO2反应来制取氧气提供呼吸.某实验小组为验证这
同学们在实验室中发现一瓶如图所示久置的瓶口有白色固体瓶塞丢失的无色溶液已知原溶液可能是NaClNaO
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我市某中学积极响应创建全国文明城市活动举办了以“校园文明”为主题的手抄报比赛．所有参赛作品均获奖奖项分为一等奖二等奖三等奖和优秀奖将获奖结果绘制成如下两幅统计图．请你根据图中所给信息解答下列问题 1一等奖所占的百分比是三等奖的人数是人 2据统计在获得一等奖的学生中男生与女生的人数比为11学校计划选派1名男生和1名女生参加市手抄报比赛请求出所选2位同学恰是1名男生和1名女生的概率 3学校计划从获得二等奖的同学中选取一部分人进行集训使其提升为一等奖要使获得一等奖的人数不少于二等奖人数的2倍那么至少选取多少人进行集训
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﹣＝．
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
探究已知二次函数y＝ax2﹣2x+3经过点A﹣30． 1求该函数的表达式 2如图所示点P是抛物线上在第二象限内的一个动点且点P的横坐标为t连接ACPAPC． ①求△ACP的面积S关于t的函数关系式 ②求△ACP的面积的最大值并求出此时点P的坐标． 拓展在平面直角坐标系中点M的坐标为﹣13N的坐标为31若抛物线y＝ax2﹣2x+3a＜0与线段MN有两个不同的交点请直接写出a的取值范围．
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.
如图1在直角坐标系中一次函数的图象l1与y轴交于点A02与一次函数y＝x﹣3的图象l2交于点Em﹣5． 1求m的值及l1的表达式 2直线l1与x轴交于点B直线l2与y轴交于点C求四边形OBEC的面积 3如图2已知矩形MNPQPQ＝2NP＝1Ma1矩形MNPQ的边PQ在x轴上平移若矩形MNPQ与直线l1或l2有交点直接写出a的取值范围．
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
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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