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A～J均为初中常见化学物质，它们之间的转化关系如图所示，部分产物已省略．已知A 是人体胃酸的主要成分，B是由四种元素组成的一种盐，C是一切生命生存所必须的物质，E是厨房重要的调味品．请回答下列问题：...
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A.B.C.D是初中常见的化学物质A是由核电荷数分别为6811的三种元素组成的化合物B是一种微溶性碱
A.B.C.D.是初中常见的化学物质A.是由核电荷数分别为6811的三种元素组成的化合物B.是一种微
A.～F都是初中常见的化学物质反应①和②为初中常见的化学反应.其转化关系如图所示部分反应条件略去.其
甲乙丙是中常见的三种不同类型的物质其中乙是水它们之间的转化关系如图所示.→表示由一种物质转化成另一种
已经A.B.C.D.E是初中常见的化学物质其中A.B.C都含有碳元素且B.C所含的元素相同C.D.E
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物质的溶液呈蓝
@B.
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
2
S0
4
B．HCl C．NaOH
Cu（OH）
2
A.～J.均为初中常见化学物质它们之间的转化关系如图所示部分产物已省略已知A.是人体胃酸的主要成分B
.A.～J.均为初中常见化学物质它们之间的转化关系如图所示部分产物已省略已知A.是人体胃酸的主要成分
A.是绿色粉末G是蓝色溶液X为常见的稀酸B.C.D.E.FH和Y中常见的物质.它们之间转化关系如图所
如图所示A.B.C.D.E均为所涉及的常见物质它们存在如下图的转化关系.C是空气的重要组成成分B是人
甲乙丙丁均为教案备课库常见的物质它们之间的部分转化关系如图所示部分反应物生成物和反应条件已略去．﹣表
甲乙丙是中常见的三种不同类型的物质其中乙是水它们之间的转化关系如图所示.→表示由一种物质转化成另一种
A.～F.均为常见的物质他们之间的关系如图所示→表示转化关系所涉及反应均为初中常见的化学反应其中A.
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
下列物质均为中常见的物质其中A.B的组成元素相同A.B.D.E.F为氧化物H为改良酸性土壤常用的物质
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
图中A.～H.都是中常见的物质已知A.B.都是黑色固体D.F.为红色固体它们之间的转化关系如图所示.
A.～J.均为中的常见物质已知A.B.的组成元素相同B.是最常用的溶剂常温下C.E.均为无刺激性气味
A.B.C.是九年级化学中常见的物质其中A.为黑色固体它们之间的转化关系如图所示有些产物已略.请按要
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
@B.
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
2
S0
4
B．HCl C．NaOH
Cu（OH）
2
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Insertingneedlesthroughtheskinmaysoundscarybutacupuncnctureandmoxa﹣moxibustiontwokeycomponentsof1traditionChinesemedicineTCMaresaidtoimprovethepatient'shealthandwell﹣being. 2addtoUNESCO'srepresentativelistofIntangibleCulturalHeritageofHumanityin2010acupunctureandmoxibustionare3widepracticedinChina.Theirformatandpracticehavedistinctiveregionalcharacteristicsandtheyhaveapreciousheritagebased4Chinesecultureandscience. ThetheoryofChinesemedicinebelievesthehumanbodyisasmalluniversewith5itowncirculatorysysteminthissystemthereareacupoints穴位connectingthechannels.Bystimulatingtheseacupointstheself﹣regulatingfunctionsofthehumanbodycan6promote.Acupuncturereferstothepracticeofinsertingneedlesintothebodyofapatientatacertainangleandusing7techniquesuchastwistingandliftingtheneedlestoexciteacupoints8treatdiseases.Moxa﹣moxibustionnormallyreferstoplacingmoxa艾directlyonacupointsorholdingmoxasticksat9distancetowarmthebody. In1995theWorldHealthOrganizationpublished10canbetreatedbyacupunctureandmoxibustion.TCMhasbecomemoreandmoreacceptedbyothercountriesintheworld.
某化学实验小组在完成“粗盐中难溶性的杂质去除”后从课本得知所得的盐中还含有可溶性杂质氯化镁氯化钙等为探究进一少除去氯化镁氯化钙方法它们做了如下的工作请你一道完成． 【查阅资料】A．氯化镁溶液可跟氢氧化钠溶液反应生成难溶的氢氧化镁和氯化钠． B．氯化钙溶液可跟碳酸钠溶液反应生成难溶的碳酸钙和氯化钠． 【实验设计】 【讨论交流】实验小组的同学对上述实验方案进行讨论认为通过以上操作还未得到纯净的氯化钠步骤“4”所得的固体可能还混有氢氧化钠和为得到纯净的氯化钠应在步骤“3”所得的滤液中加入适量的盐酸再蒸发．加盐酸可能发生的反应是写化学方程式． 【实验反思】分离提纯物质时所加的试剂只能与杂质反应过量的试剂要除去’不能使其成为新的杂质．
ChildreninruralareasofCambodiaoftensufferfromorevendieofpreventableillnessesbecausethereisnotanysoapavailable. In2014SamirLakhanianAmericancollegestudentsawtheissuewhilevolunteeringinaCambodianvillage.IrememberquitevividlyamotherbathinghernewbornbabywithlaundrypowderwhichissoharmfultotheskinsaidLakhani.It'sdifficultforruralCambodianstoaccesssoap.Firstisaffordability.Ifyouearnonly＄1.50everydayyouwon'tspend＄1onabarofsoap.Thencomesaccess.Thedemandissolowthatlocalshopsdon'tstocksoap.ThelastreasonbecausemanyCambodiansdon'treallyunderstandwherediseasescomefromtheydon'tknowhowtopreventthemincludingusingsoap. Afterfiguringoutasolutiontotheproblemthebarely﹣usedsoapinhotelsLakhanistartedaskinghotelstodonateleftoversoap.Theywerealleagertohelpheexplained. LakhaniregisteredEco﹣SoapBankshortlyafterwards.SoonhereceivedenoughfundstohiredisadvantagedCambodianwomentocollectandreproducetheusedsoap. Todaytheorganizationhasfourrecyclingcentersacrossthecountryprovidingjobsto35localwomen.Andsofarsome174000barsofsoaphavebeendonatedabout24000poundsofsoaphasbeenrecycledandhygiene卫生hasbeenimprovedforabout661000people.WearekillingthreebirdswithonestoneLakhanisaid. WhenitcomestothefutureofEco﹣SoapBankLakhanisaidWe'vejustscratchedthesurface.LackofhygieneisnotsomethinguniquetoCambodia.Thedemandforimprovedhygieneinthedevelopingworldishugeandmuchremainstobedone.We'relookingatsevencountriestoexpandtointhenearfuture. 1WhichofthefollowingisnotmentionedasthereasonwhyruralCambodiansdon'tusesoap? A.Poverty. B.Inaccessibility. C.Unawareness. D.Tradition. 2WhatdoestheunderlinedpartkillingthreebirdsinParagraph5referto? A.Savingsoapcuringdiseasesandprovidingeducation. B.Stoppingpollutionprovingjobsandinspiringdonation. C.Reducingwasteprovidingemploymentandimprovinghealth. D.Recyclingwastehelpingcharityandimprovingcommunityhygiene. 3WhatcanweinferaboutEco﹣SoapBank? A.Itwon'tbelongbeforeitexpandstothewholeworld. B.There'slittleitcandowithoutothercountries'assistance. C.Itwillmakegreatercontributionstothedevelopingworld. D.ItwillsoonsettletheproblemofpoorhygieneinCambodia. 4Whatdoesthetextmainlytalkabout? A.Eco﹣SoapBankhelpsimprovehygiene. B.Cambodianwomenhaveabrightfuture. C.AUSyoungmancallsforhelpingpoorcountries. D.Lackofhygieneremainsaseriousproblemintheworld.
下列成语中主要包含化学变化的是
如图是某元素在元素周期表中的部分信息及原子结构示意图下列从图中获得的信息不正确的是
Theworld'sinsectsaregoingdownthepathofextinctionthreateningacatastrophiccollapseofnature'secosystemsaccordingtothefirstglobalscientificreview.Morethan40%ofinsectspeciesaredecliningandthirdareendangeredtheanalysisfound.Therateofextinctioniseighttimesfasterthanthatofmammalsbirdsandreptiles. Itshouldbeofhugeconcerntoallofusforinsectsareattheheartofeveryfoodweb.Theypollinate授粉thelargemajorityofplantspecieskeepthesoilhealthyrecyclenutrientscontrolpestsandmuchmore.Lovethemor1oathethemwehumanscannotsurvivewithoutinsectssaidProfDaveGoulsonattheUniversityofSussexintheUK. TheanalysispublishedinthejournalBiologicalConservationsaysintensive集约型agricultureisthemaindriverofthedeclinesparticularlytheheavyuseofpesticides.Urbanisationandclimatechangearealsosignificantfactors. Ifinsectspecieslossescannotbestoppedthiswillhavecatastrophicconsequencesforboththeplanet'secosystemsandforthesurvivalofmankind.Itisveryrapid.In10yearsyouwillhaveaquarterlessin50yearsonlyhalfleftandin100yearsyouwillhavenonesaidreviewauthorFranciscoSánchez﹣BayoattheUniversityofSydneyAustralia. Oneofthebiggestimpactsofinsectlossisonmanybirdsreptilesamphibiansandfishthateatinsects.Ifthisfoodsourceistakenawayalltheseanimalsstarvetodeathhesaid.SucheffectshavealreadybeenseeninPuertoRicowherearecentstudyrevealeda98%fallingroundinsectsover35years. MattShardlowattheconservationcharityBuglifesaidItisthoughtfultoseethisevidencethatshowsthepitifulstateoftheworld'sinsectpopulations.Itisincreasinglyobviousthattheplanet'secologyisbreakingandthereisaneedforastrongandglobalefforttopreventandchangetheseterribletrends. 1Whyarepeopleworriedabouttheinsectdecline? A.Theyarevitaltoecosystems. B.Theyprovidefoodforpests. C.Theypollinateallplants. D.Theyenrichthesoil. 2Whatisthemaincauseofinsectlosses? A.Moreandmoretrees. B.Restrictionsonpesticides. C.Upgradingagriculture. D.Friendlyenvironment. 3Wherecanyoufindtheexacttimeofinsectlosses? A.Inparagraph1. B.Inparagraph2. C.Inparagraph3. D.Inparagraph4. 4Whatcanbeasuitabletitleforthetext? A.Humanscansurvivethepunishmentofnature B.Insectdecliningisbreakingnature'secosystems C.Nature'secosystemsareinfluencedbyhumans D.InsectsandanimalsaredyingoutinPuertoRico
Forthefirsttimeeverscientistspreparetosetabouta3﹣year﹣longprojecttheNektonMissiontoexploretheIndianOceananddocumentchangestakingplacebeneaththewavesthatcouldaffectthesurroundingregionoverthecomingdecades. Theambitiousexplorationteamwillreachoneofthelastmajorunexploredfrontiersontheplanetavastbodyofwaterthat'salreadyfeelingtheeffectsofglobalwarmingwithrisingwatertemperaturesdamagingitscoralreefs珊瑚礁.UnderstandingtheIndianOcean'secosystemisimportantnotjustforthespeciesthatliveinitbutalsoforthe2.5billionpeoplelivingintheregion. TheNektonMissionissupportedbymorethan40organizations.Researcherswillspendsevenweekssurveyingunderwaterlifemaptheseaflooranddropsensors传感器todepthsofupto6560feetintheseasaroundtheSeychelles. TheSeychellesaimstobecomealeaderinthedevelopmentofablueeconomythatdrawsontheresourcesoftheocean.Itreliesonfishingandtourismbuthaslatelyalsobeenexploitingoilandgasfrombeneaththeseafloor.Ouroceanisundergoingrapidecologicaltransformationbyhumanactivities.TheNektonMissionisvitaltohelpusbetterknowouroceanspaceandresourcestomakewisedecisions.OnlywhenweknowwhatwehaveintheoceanandwhatisitsvaluecallweproperlydecidewhattoexploitandwhattoleaveuntouchedsaidJumeautheSeychelles'ambassadortotheUN. ThemissionwillconductfurtherdivesinotherpartsoftheIndianOceanoverthreeyears.Theresearchersexpecttodiscovernewspeciesandsendvideostotheworldbysatellite.Theresearchwillprovideinformationforasummit峰会abouttheIndianOceanplannedforlate2021. 1WhydothescientistsplantoexploretheIndianOcean? A.Tosavetheendangeredcreatureslivinginthesea. B.Todiscoverthedamagemankindhasdonetotheocean. C.Tomakethebestuseofthenaturalresourcesinthesea. D.Toprotectitsspeciesandpeoplelivingaroundtheregion. 2WhichisnotincludedinthetaskstobecarriedoutaroundtheSeychelles? A.Drawingmapsoftheseafloor. B.Findingtreasuresunderthesea. C.Puttingsensorsintothedeepsea. D.Studyingunderwaterlife. 3WhatcanbelearnedabouttheNek﹣tonMission? A.ItwillextendbeyondtheIndianOcean. B.Itwillbenefitalotfromblueeconomy. C.Itwillcontributetothe2021conference. D.Itwillfindsolutionstoglobalwarming. 4Whatcanbeasuitabletitlefurthetext? A.ScientistsAretoExploretheIndianOcean B.TheSeychellesAimstoBuildaBlueEconomy C.EffectsofGlobalWarmingonMarineEcosystem D.IndianOceantheLastUnexploredFrontieronthePlanet
TheWorld'sLargestLibraries BritishLibraryUnitedKingdomLondon TheBritishLibrarywascreatedbyActofParliamentin1972previouslythelibraryhadbeenpartoftheBritishMuseumwherethefamouscircularreadingroomhadaccommodatedresearchersincludingKarlMarxwhoworkedon‘DasKapital'thereaswellasOscarWideandMahatmaGandhi.TheBritishLibraryisnowhousedinanewbuildinginSt.PancrasLondonwhereitstreasuresincludetwoGutenbergbiblestheLindisfarneGospelsandoneofLeonardodaVmci'snotebooks. LibraryofCongressUnitedStatesWashingtonD.C. Foundedin1800withtheprivatecollectionofThomasJeffersontheLibraryofCongressisineffecttheUSA'sNationalLibrary.ItreceivestwocopiesofeverythingpublishedintheUnitedStates.TheLibraryofCongresswagburnedbytheBritishArmyin1812andseverelydamagedbyfireagainin1851.ThecollectionincludesmanyrarebooksdrawingsandtwoStradivariusviolins. NewYorkPublicLibrary TheNewYorkPublicLibrarydevelopedgraduallyinthenineteenthcenturyfromthemergerandacquisition收购兼并ofanumberofpublicandprivatecollectionsithasmanybranchesindifferentdistrictsofNewYorkCity.Itremainsastructurewhichcombinespublicandprivatefinanceandgovernance.TreasuresheldatthelibraryincludeaGutenbergBible. RussianStateLibraryMoscow Foundedin1862astheMoscowpubliclibraryandmuseumthiscollectionbecametheStateLibraryin1925.InconsequenceitreceivescopiesofallRussianpublicationsandalsoholdslargecollectionsofmapsjournalsmusicscoresandrecordings.ItspossessionsincludetheArchangelGospelacodexintheSlavoniclanguagedatingfrom1092. 1Whichlibrarymetwithtwobiglossesinhistory? A.BritishLibrary. B.LibraryofCongress. C.NewYorkPublicLibrary. D.RussianStateLibrary. 2WhatcanwefindintheRussianStateLibrary? A.LindisfameGospels. B.Stradivariusviolins. C.AGutenbergBible. D.TheArchangelGospel. 3Whatdoweknowfromthetext? A.KarlMarxandOscarWideworkedaslibrariansintheBritishLibrary. B.TheLibraryofCongressreceivestwocopiesofallpublicationsinRussia. C.TheNewYorkPublicLibraryissupportedbystateandpersonaldonation. D.TheRussianStateLibrarypossessesaGutenbergBibleinSlavonic.
金属钻Co与铁具有相似的化学性质． 1钴可形成化合价为+2和+3的两种氧化物其化学式分别是． 2已知CoCl2固体是蓝色的CoCl2溶液是粉红色的．将金属钴投入稀盐酸中发生置换反应生成+2价钴的盐溶液和氢气反应的化学方程式是可观察到的现象是．
After20yearsofmarriagemywifewantedmetotakeanotherwomanoutto1.ShesaidIloveyoubutIknowthisotherwomanlovesyoutoo. Theotherwomanthatmywifewantedmetovisitwasmymotherwhohasbeenawidow寡妇for19yearsbutmybusylifehadmadeitimpossibletovisither2.ThatnightIcalledto3heroutfordinner. What'swrong?areyouwell?sheasked.Mymotheristhetypeofwomanwhosuspectsthatalatenight4isasignofbadnews. IthoughtthatitwouldbepleasanttospendsometimewithyouI5. Shethoughtaboutitforamomentand6.Duringthedinnerwehadanagreeableconversation﹣7extraordinarybutrecenteventsofeachother'slife. Beforewe8shesaidI'llgooutwithyouagain9onlyifyouletmeinviteyou. Afewdays10mymotherdiedofaheartattack.It11sosuddenlythatIdidn'thaveachancetodoanythingforher.AfewdaysafterthefuneralIreceivedanenvelopewithareceipt收据fromthesameplacewheremotherandIhad12.Anattachednote13 Ipaidthisbill14.Iwasn'tsurethatIcouldbetherebutneverthelessIpaidfortwo15﹣oneforyouandtheotherforyour16.Youwillneverknowwhatthatnightmeantforme.I17youson. AtthatmomentI18theimportanceofsayingintimeILOVEYOU.Giveyourfamilythe19theydeservebecausesometimesthingscannotbe20tillsomeothertime. 1A.home B.talk C.movie D.dinner 2A.directly B.frequently C.rarely D.exactly 3A.bring B.take C.force D.invite 4A.visit B.meal C.ring D.date 5A.argued B.whispered C.committed D.responded 6A.agreed B.refused C.promised D.nodded 7A.anything B.nothing C.something D.everything 8A.met B.parted C.left D.divided 9A.but B.and C.so D.or 10A.before B.earlier C.ago D.later 11A.broke B.formed C.fell D.struck 12A.sat B.waited C.gathered D.dined 13A.saw B.read C.showed D.wrote 14A.inadvance B.onpurpose C.byaccident D.withpatience 15A.tables B.dishes C.seats D.chances 16A.mother B.family C.wife D.child 17A.miss B.admire C.love D.hug 18A.sensed B.accepted C.checked D.pursued 19A.time B.money C.comfort D.calls 20A.ensured B.delayed C.forgotten D.forgiven
化学与生活密切相关． 1下表是中学生每人每天摄入部分营养素的参考值 人体活动所需能量主要由糖蛋白质和提供人体贫血是因为缺下列食物中含蛋白质较丰富的是填序号 a．鸡肉炖豆腐b．清炒小白菜c．红烧土豆丁 2如图是某品牌服装标签的部分内容 请根据标签提供的信息冋答在面料中属于有机合成纤维的是区分羊毛与合成纤维的简单实验方法是． 3汽车是目前人类的主要交通工具．生产汽车消耗最多的金属材料是燃油汽车排放的尾气中有CO2COH2O会污染空气的是．城市里用电动汽车代替燃油汽车可以有效改善城市空气质量电动汽车中的锂电池含有磷酸铁锂LiFePO4在磷酸铁锂LiFePO4中若锂和铁的化合价分别为+1+2则磷的化合价为．
TwoyearsagomyfriendandIwereatcollege.Withhisbirthdayquickly1hecametomewithanunusual2insteadofreceivingpresentshewantedtodosomeactsofkindness. Iwas3withsuchallidea.4insteadoftakingforthebirthdaywasreallydifferent.Iaskedhimhowhecouldcomeupwithsucha5idea.HetoldmeaboutaTEDtalkhehadwatchedongenerosity.whichhad6him.Sowestartedto7creativethingswecoulddo. Ouruniversityemployedsomesecurityguardsto8itsstudents.Theyhavetowork9keepingwatchoneverycornerthroughouttheuniversity.Forthemostpartit'sathanklessjobasmostpeoplegrow10toseeingtheguardsallaroundandeventuallybarelynoticetheir11letaloneacknowledgetheirefforts.Howcouldweshowthemourappreciation? Wedecidedtomakealargepotofhot12.WehiredaUberandaskedthedrivertotakeusaroundthecampuswhereweknewthe13wouldbeandwepouredthemeachacupofhotchocolate.TheUberdriverwas14abitdoubtfultotheentireplanbutafterawhilehewashelpingus15theguardsandourlivelyspirithad16tohimaswell.Weweremetwithmany17andappreciativewords.Itwasamazingtoseehowa18actorevenintentionofgenerositycanlifteveryone'sspirit. Inowrealizethatspecialenergyiscreatedwhenyouchoosetothinkbiggerthanyourselfandactin19ofothers.You'11findit'sactuallythegreatest20you'nevergetespeciallywhenit'syourbirthday. 1A.ending B.passing C.advancing D.approaching 2A.order B.request C.problem D.story 3A.struck B.blessed C.burdened D.bored 4A.Refusing B.Earning C.Giving D.Donating 5A.traditional B.complex C.familiar D.novel 6A.controlled B.supported C.inspired D.rewarded 7A.planout B.takeover C.watchfor D.holdback 8A.judge B.help C.monitor D.protect 9A.stepbystep B.aroundtheclock C.moreorless D.nowandthen 10A.addicted B.devoted C.attached D.accustomed 11A.presence B.hunger C.poverty D.thirsty 12A.tea B.milk C.porridge D.chocolate 13A.workers B.students C.guards D.drivers 14A.finally B.initially C.occasionally D.frequently 15A.remind B.track C.spot D.recognize 16A.spread B.moved C.happened D.returned 17A.friends B.difficulties C.greetings D.smiles 18A.similar B.small C.daily D.modest 19A.service B.place C.charge D.memory 20A.1esson B.attention C.gift D.care
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处语言错误每处中最多有两处.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. Lasttermourclassholdameaningfulactivitywhichrequiredustoformthegoodhabitin100days.Ipairedupwithmydeskmate.Firstwediscussedwhathabitthatwewoulddevelop.A11ofusagreedtoreadforhalfanhoureachday.Thenwemadealistofthebookswewereinterested.Fromthenonwemanagedtosparehalfanhoureverydaytoreadingbookshowbusywewere.Besideswetookalotofnotesandoftenexchangedidea.Intheendweaccomplishedourgoalofreadingfor100days.Howproudlywewere!Moreimportantlyduetotheactivityreadingbookshavebecomeanessentialpartofourlife.
Vehiclesoftencomeintoconflictwithothervehiclesandpedestrianswhentheirintendedcoursesoftravelintersect交叉andendupbeingineachothersway.Thegeneralprinciplethatestablisheswhohastherighttogofirstiscalledrightofwayorpriority.Itdetermineswhohastherighttousetheconflictingpartoftheroadandwhohastowait.Signssignalsmarkingsandotherfeaturesareoftenusedtomakepriorityclear. Adrivermustyield让therightofwaytootherdrivers ●WhenapproachingaYIELDsign.Slowdownorstoptoavoidacrash. ●Evenafterthelightturnsgreenwhentherearevehiclesintheintersection. ●Whenapproachingemergencyvehiclesusingsoundingorflashingsirens. ●Aftercomingtoacompletestopatanintersectionwherethereisastopsignoraflashingredsignal.Ifthereisnostoplinestopbeforethecrosswalk. ●Whenmakingaleftturnonaredlightafterastopfromaone﹣waystreettoanotherone﹣waystreetwithtrafficmovingtotheleft.SeeFigureA. ●Whentwovehiclesondifferentroadwaysarriveatafour﹣waystopintersectionatthesametimethevehicleshouldyieldtothevehicleonitsright.SeeFigureB. ●Whencomingoutofanalleybuildingprivateroadordrivewayaftercomingtoacompletestop.SeeFigureC. ●WhencrossingtrafficattheendofaTroadwithnotrafficcontrolsignsorsignals.SeeFigure D. 1What'sthepurposeofthetext? A.Toexplainthelawofrightofway. B.Toillustratetrafficsignsandsignals. C.Toinformdriversofgeneraltrafficrules. D.Tointroducetrafficrulestopedestrians. 2Whichistherightbehavioraccordingtothetext? A.Driveononcethelightturnsgreen. B.Keepdrivingifthereisnostopline. C.Yieldtoemergencyvehiclesatanytime. D.SlowdownwhenapproachingaYIELDsign. 3WhichofthefollowingdescriptionisTRUEaccordingtothefigures? A.FigureABshouldyieldtoA. B.FigureBAshouldyieldtoB. C.FigureCAshouldyieldtoB. D.FigureDAshouldyieldtoB.
IntheU.S.stateofWashingtonaroadcalledInterstate90cutsthroughawildmountainousareatoreachthecityofSeattle.Forthearea'smanykindsofanimalsthebusyhighwaygreatlylimitstheirmovements.Animalsneedtomovetofindfoodtofindmatesandtofindnewplacestolive.CrossingI﹣90astheroadiscalledisariskybutsometimesnecessaryact.Butsoonanimalswillhaveasaferchoice. Tohelptheanimalsthestateisfinishingworkonitslargest﹣everwildlifebridge.The11﹣meter﹣tall20﹣meter﹣widebridgebeginsintheforest.Workersareaddingfencinganti﹣plantstohelpguidetheanimalsacrossthebridge.TheI﹣90bridgeispartofagrowingnumberofwildlifecrossingsacrosstheUnitedStates.Somearefencessomeareoverlandbridgesandsomeareunderpasses.Theyallaimtokeepdriversandanimalsawayfromeachother. AU.S.TransportationDepartmentstudyfoundcrashesbetweenanimalsandhumansroseyearbyyear.Theaccidentsmadeupabout5percentofallcrashesnationallyandcosttheeconomyabout﹩8billion.Suchcostscomefromcarrepaidemergencyroomvisitsandremovalofthedeadanimalsonroads.Collisionsbetweenanimalsanddriversarerarelydeadlytopeople.Buttheyareoftendeadlytowildlife.Thestudyalsofoundthat21endangeredorthreatenedspeciesintheU.S.areaffectedbyvehiclehits. PattyGarveyDardaoftheU.S.ForestServicesaysthe﹩6﹣millionbridgewillonedaypayforitselfbecausethehighwaywillnothavetobefullyorpartlyclosedeachtimealargeanimalisstruck.IfyoushutdownInterstate90youshutdowninterstatetrade.sheadds. 1Whyismovingacrosshighwaysnecessaryforanimals? A.Tosurvive. B.Tofindfood. C.Tofollowtheirhabit. D.Tofreetheirmovements. 2WhatarethosewildlifecrossingsintheU.S.builtfor? A.Avoidinghumandeaths. B.Preventingcaraccidents. C.Increasinginterstatetrade. D.Protectingwildanimals. 3WhatdoestheauthorintendtodoinParagraph3? A.Highlighttheharmcausedbycaraccidents. B.Showthecostsrelatedtocar﹣animalcrashes. C.Explainthenecessityofwildlifecrossings. D.Presenttheurgencytoprotectwildspecies. 4WhatisDarda'sattitudetowardsthebuildingofI﹣90? A.Opposed. B.Concerned. C.Favorable. D.Indifferent.
A～F是教案备课库常见的六种物质它们之间的关系如图所示“→”表示物质间的转化关系“﹣”表示两种物质能相互反应部分反应物生成物及反应条件未标出．物质A可以与酸碱盐三类物质发生反应D是厨房中常用的调味品F的溶液呈黄色反应①和②都有白色沉淀生成请回答 1写出ACD的化学式ACD． 2写出①的基本反应类型是． 3反应②的化学方程式为．
Itmaybemadepossibleforcomputersandrobotstoreadhumanpersonalitiesbyreadinghumaneyemovements. Theeyesarereallythewindowstothesoul.ThatistheresultofanewstudyontheconnectionbetweeneyemovementsandpersonalityconductedbyneuroscienceresearchersbasedattheUniversityofSouthAustraliaandPublishedinthescientificJournalFrontiersinNeuroscience.Andifthatistruecomputersandrobotspoweredbysophisticatedalgorithms算法maysoonhavetheabilitytopeerintoyoursoul. EyemovementsduringaneverydaytaskpredictaspectsofourpersonalitywrotetheresearchersledbyTobiasLoetscherwhoseteamfollowed42studysubjectsaroundtheuniversitycampusrecordingtheireyemovementsthendeterminedtheirpersonalitytraits特点withwell﹣establishedquestionnairesfordeterminingpersonalitytypeandunfoldedsomekindofconnectionsbetweeneyemovementsandpersonalityaccordingtoasummaryofthestudypublishedbythesiteScienceDaily. Theresearchersexpectedthatwiththedatafedintotheiralgorithmscomputersrunningthealgorithmswereabletorecordhumaneyemovementsandimmediatelydetermineaperson'smajorpersonalitytraitssuchasneuroticismextraversion外向agreeablenessconscientiousnessaswellasperceptualcuriositythescientistswrote. Thenewfindingmighthelpimprovethewayhumanbeingsinteractwiththeircomputersandotherhigh﹣techdevicesevenrobotsallowingformorenaturalandrealisticsocialinteractionswithmachinesLoetschersaid. Peoplearealwayslookingforimprovedpersonalizedservices.Today'srobotsandcomputersarenotsociallyawaresotheycannotadapttonon﹣verbalinformationLoetschersaidinastatementquotedbyIndianExpress.Thisresearchprovidesopportunitiestodeveloprobotsandcomputersthatcanbecomemorenaturalandbetteratinterpretinghumansocialsignals. ThestudyrevealedpreviouslyundiscoveredrelationsbetweenspecificpersonalitycharacteristicsandspecificeyemovementtendenciesaccordingtoasummaryinBritain'sDailyMailnewspaper. 1Whatisthefindingofthenewstudy? A.Robotscanunderstandhumanpersonality. B.Eyemovementsconnectwithpersonality. C.Computersrecordhumaneyemovements. D.Personalitydetermineshumaneyemovements. 2WhatdoesParagraph3mainlyintroduce? A.Theresearchsubjects. B.Theresearchprocess. C.Theresearchoutcomes. D.Theresearchapplication. 3WhatcanbeinferredfromwhatLoetschersaid? A.Robotswillbesmarterthanhumans. B.Machinesmaybecomemoresocial. C.Theresearchisoflittlesignificance. D.Human﹣machineinteractionwillexplode. 4Whatdoesthetextmainlytellus? A.Thefindingofanewstudy. B.Eyesaswindowstothesoul. C.Thehuman﹣machineinteraction. D.Thedevelopmentofhigh﹣techdevices.
气体的溶解度也有一定的变化规律． I打开可乐瓶逸出大量气泡．由此可见压强越小CO2的溶解度越．为增大CO2的溶解可采用的一种方法是． II不同温度下氧气的溶解度随压强的变化如图所示图中t1℃对应的温度为40℃则t2对应的温度填编号． a．大于40℃b．小于40℃c．无法确定．
A﹣﹣H是初中常见的物质其中B能作干燥剂E为黑色粉末H为蓝色难溶固体．它们之阆的反应关系如图部分物质和反应条件已略去回答下列问题 1E为． 2写出下列化学方程式①②③．
AtthebeginningofChineseYearofthePigavideocalledWhatisPeppaPigmadeapinkpigthe1hotimageinChina.Thevideofeaturesanelderlymanlivinginthecountryside.2giveaNewYeargifttohisgrandsoninthecityhewonderswhatPeppaPigis.Theelderlymain3eventualmakesaPeppaPigbyhimselfbasedonablowingmachine.Thevideo4conveysthemessageoffamilyreunionandagrandfather'slovewon1500millionclickswithin24hours.Andthepopularcartooncharacterwithitsroundbellyandbigearshaslongbeentaken5asymbolforabundancewealthandgoodluckinChineseculture.Thepeppaalongsideherfamily6becomeaglobalhitsincethecartoon'sreleasein2004.Thechildren'sTVshowissopopularbecauseitisoneofthefewthatfamiliescanenjoytogetherwithoutadultsfeeling7bore.The8producemadehisfortunethankstotheyoungpeppapig.9itcomestothesecretofsuccessheexplainedthathetriedto10simpletheshowandensuredthepigletisunforgettable.
Adayinthelifeofasunbeariswhatyoumightexpectfromthenamesunny.Initsnaturalhabitatthesunbearspendsover80percentofitsactivewakingtimeindaylight. Butwhendisturbedbyhumanactivitythatchangesdramatically.Inareaswherepeoplearepushingintothesunbear'shabitattheanimalsarespending90percentoftheirwakingtimeafterdark.Effectivelythethreatofhumanpresenceismakingthesunbearchangeintothemoonbear. LedbyscientistsattheUniversityofCaliforniaBerkeleythestudyfoundthathumanactivityisdrivingscoresofmammalstoshifttheiractivityfromthedaytimeintothedarkhoursofthenight.Asmanyanimalshavealreadybeenforcedoutoftheirlocalhabitatsothersareattemptingtoavoidinteractionwithhumansbyseparatingthemselvesintimeratherthaninspace. Fortheworktheresearchersexaminedthebehaviorsof64mammalspeciesincludingdeertigersboarsandofcoursesunbears.Theyobservedincreasednocturnal夜间的behaviorinalargemajorityofthemwithspeciesthatarenaturallyactiveduringthedaytendingtoshifttheiractivitytoafterdarkandthosethatarenaturallynocturnalbecomingmoreso.Themammalsaffectedrangedacrossbodysizehabitattyperegionoftheworldanddiet. Humanactivityofallsortsaffectanimalslivesincludingactivitieslikehuntingagricultureandlanddevelopmentharvestinglocalnaturalresourcesevenhikingorwalkingthroughwildareas.SporthuntingintheHwangeNationalParkinZimbabwedroveantelopestospendmoreoftheiractivewakinghoursatnightrestrictingtheiraccesstowater.SimilarlyhikersintheSantaCruzMountainsinCaliforniamadecoyotes郊狼morenocturnalforcingthemtofindnewpreys猎物amongtraditionallynocturnalanimals. Theresearcherswarnthatprofoundshiftsinthenaturalbehaviorpatternsofsomanyspeciesdisturbdynamicsthathaveevolvedovergenerationsleadingtoaseriesofunknowneffectsontheentireecosystems. 1Whatdidthestudyfind? A.Moreanimalsseparatethemselvesinspace. B.Humanactivitychangesanimals'wayoflife. C.Manyanimalswerepushedoutoftheirlocalhabitats. D.Thesunbearspendsover80%wakingtimeindaylight. 2Whatdoestheunderlinedwordthatreferto? A.Thesunbear. B.Thewakingtime. C.Humanactivity. D.Thenaturalhabitat. 3Whatcanweinferfromparagraph5? A.Antelopeshaveeasieraccesstowater. B.Coyoteshavetopreyonnewtypesforsurvival. C.Humanactivityshortensanimals'sleepingtime. D.Animalshavemanagedtoescapeinteractionwithhumans. 4Whatdoestheauthorwanttotellusinthetext? A.Humanthreatmakesthesunbearnocturnal. B.Animalsarebadlyhurtbyhumanpresence. C.Animalsbecomemoreadaptablethankstohuman. D.Ecosystemsmaybereshapedduetohumanactivity.
Livingtotheripeoldageof90maydependonyourbodysize﹣bothheightandweight﹣aswellasyourlevelofphysicalactivityandgeeingtoinfluenceawoman'slifespanmorethanitdoesaman's. Thestudyfoundwomenwholivedto90wereonaveragetallerandhadputonlessweightsincetheageof20ascomparedtowomenwhowereshorterandheavier.1Howevermensawmorebenefitfromphysicalactivitythanwomen. In1986researchersaskedover7000Norwegianmenandwomenbetweenage55and69abouttheirheightcurrentweightandweightatage20.Bothgendersalsotoldresearchersabouttheircurrentphysicalactivities.2Themenandwomenwerethensortedintodailyactivityquotaslessthan30minutes30to60minutesand90minutesormore. Menandwomeninthestudyfaredverydifferentlywhenitcametotheimpactofbodysizeandexercise. Womenwhoweighedlessatage20andputonlessweightastheyagedweremorelikelytolivelongerthanheavierwomen.3Thestudyfoundwomenwhoweretallerthan5feet9incheswere31%morelikelytoliveintotheir90sthanwomenwhowerelessthan5feet3inches. 4Menwhospent90minutesadayormorebeingactivewere39%morelikelytoliveto90thanmenwhowerephysicallyactiveforlessthan30minutes. Howeverwomenwhowerephysicallyactiveformorethan60minutesadaywereonly21%morelikelytoliveto90thanthosewhodid30minutesorless.Andunlikementherewasnobonusforincreasingactivity.5 A.Heightplayedamajorfactor. B.Nosuchassociationwasseenformen. C.Thestudywasobservationalandcouldn'testablishcause. D.Infactthestudyfoundthattheoptimallevelofactivityforwomenwas60minutesaday. E.Neitherheightnorweightseemedtofactorintowhetherthemenreachedtheir90sbutactivityleveldid. F.Inadditionforeach30minutesadaythemenwereactivetheywere5%morelikelytoreachthatage. G.Andtheyincludeddogwalkinggardeninghomeimprovementswalkingorbikingtoworkandsports.
Currentdigitaltechnologygivesusmusicofflawlessquality.Italsomakesiteasiertocopyuploadandstreammusicwithouthavingtodownloadit.1.Howeverasclimatechangeisoneveryone'smindthesedaysthequestionrelatedtomusicarisesWhichmusicconsumptionformisworsefortheenvironmentCDsvinyl黑色胶片ordigitalmusic?Theanswermightsurpriseyou. 2logicwouldsuggestthatmusicdownloadsandonlinestreamingaregoodfortheenvironment.Butmustitsurelybemoreenvironmentallyfriendly?Eventhoughstreamedmusicismaterial﹣freethatdoesn'tmeanitdoesn'thaveanenvironmentalimpact.Infacttheinformationissearchedandsenttoourelectronicdevicesacrossthenetworkwhichcostsenergy.3. ResearchersfoundthatstreaminganalbumovertheInternetwilluse27timesmoreenergythanittakestoproduceasingleCDorvinylrecord.Inanygivensecondthemusicplatformisservingabout2.5millionstreamsatthesametime.4thatmeansalmost210000albums'worthofmusichasbeenstreamed.Itwillusenearly8000timesmoreenergythanwhatmakingoneCDtakes.MeanwhileifyoubuyaCDit'stherepermanently.TheonlyextraenergyrequirediswhateveryouneedtopoweryourCDplayer. ThestudywaspublishedbeforeRecordStoreDay﹣﹣aneventthatencourageslistenerstobuyphysicalrecord.5.Rathertheywantyoutothinkaboutyourpoweruseandchooseservicesthatminimizetheireffectontheplanet.Theyalsohopethiscoulddevelopalternativesthataremoresustainablewithoutsacrificingtheconvenienceyouexpect. A.Sinceourdigitalmusicuseslessplastic B.Ifaveragealbumscontaintwelvetracks C.Thishappenseverytimewestreammusic D.Asaresultstreamingmusicbecomespopular E.Althoughstreamingmusicisagreeneralternative F.Itwantstoconveyeffectsofstreamingoneconomy G.Buttheresearchersaren'tadvisingplayingmusictraditionally
下列关于水的说法正确的是
如图是甲乙两物质的溶解度曲线下列说法正确的是
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词符号^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. Weloveourcampuscanteenlocatednextbyourdormitory.Alltheyeararounditprovideduswithhealthydeliciousanddiversefood.Everydaywecanenjoyourmealsinthecleanerandtidydininghallwithpleasantlightbackgroundmusic.Afriendlyandpatientstaffinthecanteentreatmeastheirownchildren.Theyneverfailtomakeushappyandrelaxedwiththeirsmilefacesandwhatcan'tbeignoredisthathowthepriceofthemealisquitereasonable.InviewofallthisstudentslovinglycallHappinessCanteen.IamsurelyIwillmissitevenaftermygraduation.
“双吸剂”是常用的食品保鲜剂可用来吸收氧气二氧化碳水蒸气等气体．某化学小组的同学在袋装食品中发现一包久置的双吸剂．其标签如图所示． 【提出问题】久置固体的成分是什么 【收集资料】 1查阅资料铁与氯化铁溶液在常温下生成氯化亚铁Fe+2FeCl3＝3FeCl2． 2打开固体包装观察部分粉末呈黑色部分粉末呈白色另有少量红棕色的块状固体． 【作出猜想】久置固体中可能含有FeFe2O3CaOCaOH2CaCO3．猜想固体中可能含有Fe2O3的依据 是． 【实验探究】下表是甲组同学设计并记录的实验报告请你补充完整． 【实验质疑】乙组同学认为甲组同学第二步操作得出的结论不合理理由是用化学方程式表示．甲组同学第三步操作得出“一定不含有Fe2O3“的结论也是错误的理由是． 【继续探究】为验证固体中是否含有Fe2O3乙组同学用磁铁先分离出铁粉向残留固体中加入足量稀盐酸若溶液呈色证明固体中含有Fe2O3写出该反应的化学方程式．
用元素符号或化学式填空 1三个碳原子2五个二氧化氮分子 3铁离子4天然气主要成分
假定你是李华你校举办了一场用英语讲好中国故事的主题演讲活动请你写一则英文报道.要点如下 1.时间和地点 2.活动的过程 3.活动的意义. 注意1.词数100左右2.可以适当增加细节以使行文连贯.
假如你是李华应美国西湖中学校报邀请写一篇短文介绍你校课外活动extracurricularactivities.内容包括 1.课外活动的时间 2.形式多样的活动 3.欢迎来我校交流. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
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