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化学兴趣小组为研究氢氧化钠、氢氧化钙两种溶液的化学性质,进行了如图1实验: (1)A、B试管中加入酚酞溶液后均变红色,说明两种溶液都呈 (填“酸性”、“碱性”或“中性”). (2)C中反应...
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对知识的归纳和总结是学好科学的重要方法在学习了碱的性质后小红同学总结了氢氧化钙的四条化学性质如图即氢
为研究氢氧化钠氢氧化钙两种溶液的化学性质进行如下实验①AD.中酚酞均变________色说明两种溶液
氢氧化钠溶液和氢氧化钙溶液具有相似的化学性质其本质原因是
都能与指示剂作用
都能解离出氢氧根离子
都能解离出金属阳离子
都含有氢元素和氧元素
氢氧化钠溶液和氢氧化钙溶液具有相似的化学性质其本质原因是
都能与指示剂作用
都能解离出氢氧根离子
都能解离出金属阳离子
都含有氢元素和氧元素
对知识的归纳和总结是学好科学的重要方法在学习了碱的性质后小红同学总结了氢氧化钙的四条化学性质如图即氢
下列有关酸碱性质和用途的说法不正确的是
氢氧化钠在生活中可用来去除油污,可做炉具清洁剂
氢氧化钠、氢氧化钙化学性质相似,是因为其溶液中都含有金属离子
盐酸、硫酸化学性质相似,是因为其溶液中都含有相同的H
+
用食醋可除去热水瓶胆壁上的水垢
氢氧化钠和氢氧化钙都能与二氧化碳发生反应氢氧化钙与二氧化碳反应的化学反应方程式为现有两份等质量的二
为研究氢氧化钠氢氧化钙两种溶液的化学性质进行如下实验①AD.中酚酞均变色说明两种溶液都呈碱性②B中溶
氢氧化钠溶液和氢氧化钙溶液具有相似的化学性质其本质原因是
都能与指示剂作用
都能解离m氢氧根离子
都能解离JLH金属阳离子
都含有氢元素和氧元素
对知识的归纳和总结是学好科学的重要方法在学习了碱的性质后小红同学总结了氢氧化钙的四条化学性质如图即氢
氢氧化钠溶液和氢氧化钙溶液具有相似的化学性质其本质原因是
都能与指示剂作用
都能解离出氢氧根离子
都能解离出金属阳离子
都含有氢元素和氧元素
氢氧化钠氢氧化钙等碱溶液为什么具有一些相似的性质如何把氢氧化钠溶液和氢氧化钙溶液用化学方法鉴别出来
对知识的归纳和总结是学好化学的重要方法在学习了碱的性质后小红同学总结了氢氧化钙的四条化学性质如图即氢
对知识的归纳和总结是学好化学的重要方法在学习了碱的性质后小红同学总结了氢氧化钙的四条化学性质如图K1
氢氧化钠溶液和氢氧化钙溶液具有相似的化学性质其本质原因是
都能与酸碱指示剂作用
都能解离出氢氧根离子
都能解离出金属阳离子
都含有氢元素和氧元素
小明同学学习了氢氧化钙和氢氧化钠的化学性质后知道氢氧化钙和氢氧化钠都能与二氧化碳反应二氧化碳通入石灰
某化学兴趣小组为了测定一工厂废水中硫酸的含量取100g废水于烧杯中加入120g质量分数为10%的氢氧
碱的化学性质是写出有关的化学方程式1碱溶液能与酸碱指示剂反应使试液变蓝使试液变红.2碱+非金属氧化物
小明同学学习了氢氧化钙和氢氧化钠的化学性质后知道氢氧化钙和氢氧化钠都能与二氧化碳反应二氧化碳通入澄清
氢氧化钙和氢氧化钠是常见的两种碱检验二氧化碳时常用氢氧化钙溶液吸收二氧化碳时常用氢氧化钠溶液请解释其
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ManypeoplestrugglewithsayingNo.1Rememberjustbecauseyoucandosomethingdoesnotmeanitisrequired.UnderstandyoualwayshavearighttoturndownaninvitationorrefuseafavorandfigureoutthebestwaystosayNo.Herearesomespecifictips. Giveyourselfpermissiontosayno.ManypeoplehaveanimmediatereactiontosayYeswhenthey'reaskedtodosomeoneafavor.KeepinmindyouareneverrequiredtosayYes.It'sactuallyokaytosayNosometimes.AcceptthisasyoupreparetosayNotosomeone.2 Setupyourpersonalboundaries.3Howeverthatreasondoesnothavetobeconcrete.Manypeoplethinkiftheycandosomethingtheyshould.YourreasonforsayingNocanbeasimplematterofyourownpersonalboundaries.Thinkaboutwhatboundariesyouhaveandacceptthefactyou9reallowedtostaytruetothem. 4Peopleoftenwon'ttakeNoforananswer.IfyousayNotosomeonetheymaygiveyouvariousreasonstotryandchangeyourmind.Staydeterminedforyourdecisionanddonotgiveineasily. PracticesayingNo•ItmaysoundsillybutyoucanactuallypracticesayingNo'alone.5PracticegivingafirmNotosomeonesoyougetcomfortablewiththewords.ManypeoplearenervousaboutsayingNoandmaysayYesduetoanxiety.Practicingcanhelpgetridofsomeofthisanxiety. A.ThiswillhelpyousayNowithease. B.Beawareofpotentialpersuasiontechniques. C.Findagoodchancetostandinfrontofacrowd. D.It'salwayseasiertosayNoifyouhaveareason. E.Trystandingbeforeamirrorandlookingatyourself. F.It'srathereasyforyoutosetupyourpersonalboundaries. G.IfsomeoneasksyouafavoryoumayfeelyouhavetosayYes.
甲乙丙丁四人各进行了10次射击测试他们的平均成绩相同方差分别是S甲2=1.2S乙2=1.1S丙2=0.6S丁2=0.9则射击成绩最稳定的是
Findingsparechangeoranextradollarinyourpocketalwaysfeelslikeavictory1.WithoutthinkingyoumighthearthefamiliarrhymeinyourheadwhenyouspotoneonthesidewalkFindapennypickitup.Alldaylongyou'llhavegoodluck. Accordingtoonetheorypeopleoriginallythoughtpennieswouldbringgoodluckbecauseofreligiousbeliefs2.Thistheoryalsofueledothersuperstitions迷信行为likecharmbraceletsandmetalhorseshoeswhicharealsolucky.Plusmetalcurrencylikepennieswerelinkedtomorewealthandthusmoreluck.Thatmightbeastraightforwardexplanationbutotherelevenstrangeoriginsofothereverydaysuperstitionsurearen't. Anotherreasonpeoplemighthaveclaimedpennieswouldbringgoodluckcomesdowntothebattlebetweengoodandevilwhichisliketwosidesofthecoin.Findingapennyheadsup.meantyou'dhaveluckonyoursidebuttailsupwouldmeantheopposite3.SomepeoplesaythatifyoufindapennytailsupyoushouldturnitovertomakeitheadsupsothatitcanbringlucktowhoeverfindsItnext. 4.TheIrishhalf﹣pennywhichstoppedcirculatingin1987isespeciallyluckytoanyonewhofindsone.Thenthere'salsotheoldsayingSomethingoldsomethingnewsomethingborrowedsomethingblueandapennyintheshoe.5. A.PenniesFromHeavenisawayofthinking B.althoughtheexactreasoningforthisisunknown C.butevenfindingsomeThingworthaslittleasapenny1ssatisfying D.Nomatterwhatthereasonispenniesarepartofmanyluckytraditions E.Placinggsilversixpenceinthebride'sleftshoeissaidtobeasymbolofwealth F.Theseareallthingsbridesshouldwearontheirweddingdayforgoodluckintheirmarriage G.Folktalesfromancientcivilizationssaidmetalsweregiftsfromgodsintendedtoprotectpeoplefromevil
如图已知BE平分∠ABC且BE∥DC若∠ABC=50°则∠C的度数是
Whilestaringoutofthewindowduringaflightnoteveryonewillthinkcarefullyaboutthequestionwhyairplaneshaveroundedwindowsratherthansquareones. Overtheyearsaerospaceengineeringhasmadehugestepsinairplanetechnologymeaningplanescancarrymorepassengersandgofaster.Theplaneshavealsochangedshapetoincreasesafety﹣includingthewindows.Ascommercialairtraveltookoffinthemid﹣20thcenturyairlinecompaniesbegantoflyathigheraltitudestolowertheircost﹣theairdensity密度isloweruptherecreatinglessdrag阻力forairplanes.Howeverhigheraltitudescamewithproblemslikethefacthumanbeingscan'treallysurviveat30000feet.Tomakethatpossiblethecabinwaschangedtoacylindrical圆柱体shapetosupportthepressureinside.Butatfirstplanebuildersleftinthestandardsquarewindowsandthisexpansionmeantdisaster.ThedeHavillandCometcameintofashioninthe1950s.Withaclosedcabinitwasabletogohigherandfasterthanotheraircraft. Howeverwherethere'sacornerthere'saweakspot.Windowshavingfourcornershavefourpotentialweakspotsmakingthemlikelytocrashunderstress﹣suchasairpressure.Bycurvingthewindowthestressthatwouldeventuallybreakthewindowcornerisdistributedandthechanceofitbreakingisreduced.Roundedshapesarealsostrongerandresistdeformation变形andcanthussurvivetheextremedifferencesinpressurebetweentheinsideandoutsideoftheaircraft. Fortunatelydesignersfiguredoutthelackofdesignprettyquick.Nowwehaveniceroundedairplanewindowsthatcanresistthepressureoftravelingaltitude.Itgivesbeingabletogazeoutofyourwindowtotheworldfrom35000feetawholenewoutlookdoesn'tit? 1Whydidairlinesaimtoflyathigheraltitudes? A.Toincreasesafetyoftheplane. B.Tohelptheplanetotakeoff. C.Tosavemoneyforlessdrag. D.Tocarrymorepassengersandgofaster. 2WhatdoestheunderlinedwordsdeHavillandCometinParagraph2referto? A.Aplanet. B.Aband. C.Anaircraft. D.Adesign. 3Whichistheadvantageoftheroundedwindow? A.Itreducesthepossibilityofbreakingup. B.Itweakensthestrengthofairpressure. C.Itincreasestheairpressure. D.Ithelpstosurvivetheextremeweather. 4Wheredoesthistextcomefrom? A.Anewspaperonsafedriving. B.Amagazineonfashiondesign. C.Awebsiteonsurvivalskills. D.Asciencebookonflying.
TouristGuideToTheNationalGallery OpeninghoursDaily10am﹣6pmFriday10amn﹣9pm Closed.24﹣26December Reasonstovisit Withover2300paintingsinthecollectiontherearehundredsofreasonstovisittheGallery Herearesometogetyoustarted.…… ★Getintogreatart.FromLeonardodaVincitoVincentvanGogh.Seepricelessworksofartforfree…… ★GetcreativeBrushupyourskillsandcreateyourowngreatworksofart…… ★Leanaboutart.Discovermoreaboutpaintings. ★Beinspired.LifedeathpassionbeautyEverypaintingtellsastory. ★Relax.Escapefromthenoisycityintoapainting. Regulations ★Talkinalowvoicewhenyouuseyourcellphoneinthegallery. ★Nottouchingthepaintingsorotherexhibits.Nottakingpetsinorcrossingthebarriers. ★Consumingfoodanddrinkindesignatedareasonlyi.e.notinroomsthatcontainpaintings ★Followingour‘no﹣smoking'policyinanypartofthebuilding. ★Followingour‘no﹣photography'policyinexhibitionswhereasignisdisplayed Access TheNationalGalleryaimstomakeaccesstothepaintingsenjoyableandwelcomingtothewidestpossiblepublic.Therearearangeoffacilitiestohelpyouseethecollectionvisitexhibitionsandcometoevents TheGalleryoffersBritishSignLanguage﹣interpretedAsonpaintingsforvisitorswhoareleafandspecialartsessions展期forvisitorswhocan'tsee. AddressTheNationalGalleryTrafalgarSquareLondonWC2NSDN. Gettinghere ★Bytube TheneareststationsareCharingCrossNationalRailNorthernandBakerloolinesandLeicesterSquareNorthernandPiccadillylines ★Bybus Routes36911131523248791139and176stopatTrafalgarSquare. ★Bybike ThenearestbikestandsareonOrangeStreetStMartin'sStreetStMartinsPlaceandDuncannonStreet Clickheretofindmoreinformation. 1WhenistheNationalGalleryclosed? A.Onthanks﹣giving B.AtChristmas C.OnNewYearsDay D.AtEaster 2WhatarevisitorsallowedtodointheNationalGallery? A.Makeacall. B.Takeadogin C.Smokeacigarette. D.Touchthepainting 3Whoarespecialartsessionsintendedfor. A.Youngvisitors. B.Foreignvisitors. C.Disabledvisitors. D.Femalevisitors
Doesmysmilelookbiginthis?Futurefitting﹣roommirrorsinclothingstorescouldsubtlyadjustyourreflectiontomakeyoulookandhencefeel﹣﹣happierencouragingyoutolikewhatyousee. That'stheideabehindtheEmotionEvokingSystemdevelopedbyShigeoYoshidaandcolleaguesattheUniversityofTokyoinJapan.Thesystemcanmanipulateorinotherwordscontrolyouremotionsandpersonalpreferencesbypresentingyouwithanimageofyourownsmilingorfrowningface. Theprinciplethatphysiologicalchangescandriveemotionalonesthatlaughtercomesbeforehappinessratherthantheotherwayaround﹣isawell﹣establishedidea. Theresearcherswantedtoseeifthisideacouldbeusedtobuildacomputersystemthatmanipulateshowyoufeel.Thesystemworksbypresentingtheuserwithaweb﹣cameraimageofhisorherfaceasiftheywerelookinginamirror.Theimageisthensubtlyalteredwith﹣softwareturningthecornersofthemouthupordownandchangingtheareaaroundtheeyessothatthepersonappearstosmileorfrown. Withouttellingthemtheaimofthestudytheteamrecruited招募21volunteersandaskedthemtositinfrontofthescreenwhileperforminganunrelatedtask.Whenthetaskwascompletedtheparticipantsratedhowtheyfelt.Whenthefacesonscreenappearedtosmilepeoplereportedthattheyfelthappier.Ontheotherhandwhentheimagewasgivenasadexpressiontheyreportedfeelinglesshappy. Yoshidaandhiscolleaguestestedwhethermanipulatingthevolunteersemotionalstatewouldinfluencetheirpreferences.Eachpersonwasgivenascarftowearandagainpresentedwiththealteredwebcamimage.Thevolunteersthatsawthemselvessmilingwhilewearingthescarfweremorelikelytoreportthattheylikeditandthosethatsawthemselvesnotsmilingwerelesslikely. Thesystemcouldbeusedtomanipulateconsumers'impressionsofproductssaytheresearchers.Forexamplemirrorsinclothing﹣storefittingroomscouldbereplacedwithscreensshowingalteredreflections.Theyalsosuggestpeoplemaybemorelikelytofindclothesattractiveiftheyseethemselveslookinghappywhiletryingthemon. It'scertainlyaninterestingareasaysChrisCreedattheUniversityofBirminghamUK.Buthenotesthatusingsuchtechnologyinashopwouldbeharderthaninthelabbecausepeoplewilluseawiderangeofexpressions.Attemptingtomakeslightdifferencestotheseandensuringthatthereflectedimagelooksbelievablewouldbemuchmorechallenginghesays. Ofcoursetherearealsoimportantmoralquestionssurroundingsuchsubtlymanipulativetechnology.Youcouldarguethatifitmakespeoplehappywhatharmisitdoing?saysCreed.ButIcanimaginethatmanypeoplemayfeelmanipulateduncomfortableandcheatediftheyfoundout. 1What'sthemainpurposeoftheEmotionEvokingSystem? A.Toseewhetherone'sfacialexpressionscanbealtered. B.Toreplacethemirrorsinfutureclothing﹣storefittingrooms. C.Toseewhetherlaughtercomesbeforehappiness. D.Toseewhetherone'sfeelingcanbeunconsciouslyaffected. 2Whatcanwelearnabouttheweb﹣cameraimageinthestudy? A.Itrecordedthevolunteers'performanceinthetask. B.Itattemptedtomakethevolunteersfeelhappier. C.Itgavethevolunteersafalseimage. D.Itbeautifiedthevolunteersappearanceinthemirror. 3WhatdoesCreedmentionasalimitationofthetechnology? A.Itonlydealswithalimitednumberoffacialexpressions. B.Itonlyworksinclothingstores. C.Itonlymakessubtlechangestopeople'sexpressions. D.Itonlychangestheareasaroundthemouthandtheeyes. 4WhatdoesCreedscommentonthemoralissueswiththistechnologyimply? A.Peopleshouldmaketheirdecisionsindependently. B.Technologyisunabletomanipulatepeople. C.Nothingismoreimportantthanhappiness. D.Peopleshouldneglecttheharmofthetechnology.
Haveyoueverspentanafternooninthebackyardmaybegrillingorenjoyingabasketballgamewhensuddenlyyounoticethateverythinggoesquiet?Thereisanoldphrasecalmbeforethestormoftenusedinasituation﹣aquietperiodjustbeforeagreatactivityorexcitement.Accordingtoourownexperienceweknowthereisactuallycalmbeforethestorm.Butwhatcausesthiscalm?Andisitalwayscalmbeforethestorm?Let'shearwhatscientistshavetosay. Aperiodofcalmhappensinaparticularkindofstormthesimplestkindofstorm﹣asingle﹣cellthunderstorm.Inthistypeofthunderstormthereisusuallyonlyonemainupdraftwhichiswarmdampairanddrawnfromplacesneartheground.Stormsneedwarmanddampairasfuelsotheytypicallydrawthatairinfromsurroundingenvironment.Stormscandrawintheairthatfittheirneedfromalldirections﹣evenfromthedirectioninwhichthestormistraveling. Asthewarmdampairispulledintoastormsystemitleavesalow﹣pressurevacuum真空comingafter.Therisingairmeetsthecolddryairthathasalreadyexistedinthestormcloudsthusthetemperatureofthewarmdampairdropsandthewatervapour水蒸汽initchangesintotinydropsthatareapreconditionofrain.Thesedropsaccumulateandbuildonlargerparticleslikedustuntiltheygrowlargeenoughtoformraindrops. Thiswarmdampairkeepsmovingupwardsbutitbecomescooleranddrierduringitstripthroughcloud.Whenitreachesthetopofthecloudtheairgetsspitout被挤出atthetop.Thisairissentrollingoutoverthebigthunderclouds.Fromtheretheairgoesdown.Warmanddryairisrelativelystableandonceitcoversaregionthatairinturncausesthecalmbeforeastorm. Mostthunderstormsthoughdon'tstartwithcalm.That'sbecausemostareactuallygroupsofstormswithcomplexwindpatterns.There'ssomuchairmovingupanddownstormgroupsthatthecalmbeforethestormneverhappens.Insteadbeforethestormitmightbereallywindy! 1Whichbestfitsthedescriptionofaparticularkindofstorm? A.Athunderstormwithasingleshape. B.Athunderstormwithoutstrongwinds. C.Astormwithairdrawnfromeverydirection. D.Astormfueledbymovingairfromtheground. 2WhatdoestheunderlinedworditinParagraph3referto? A.Coldanddryair. B.Warmanddryair. C.Coldanddampair. D.Warmanddampair. 3Whichdoesthewritermostlikelyagreeto? A.Presenceofthecalmreliesonstableair. B.Notallthunderstormsstartwiththecalm. C.Thedriertheairisthebiggerthestormwillbe. D.Stormhappenswithoutairmovingupanddown. 4Whatisthepassagemainlyabout? A.Causesandeffectsofaheavystorm. B.Abriefdescriptionofapeacefulstorm. C.Apersonalexperienceofaheavystorm. D.Anexplanationofthecalmbeforeastorm.
假定你是李华你的英国朋友Josh来信询问你的暑假实践活动安排.请回邮件告知你的打算.内容包括 1.看望老人学做家务 2.学打羽毛球 3.参加社区文艺演出. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
Newsanchors主播musthavebeenreluctanttoreadoutthefollowingnewsXinXiaomengbeganworkingastheworld'sfirstfemaleartificial人工的intelligencenewsanchoratXinhuaNewsAgencyonSundaythreemonthsafteramalerobotjoinedtheprofession. UnlikepreviousnewsrobotsthoughXindoesnotreadnewslikeacoldmachineshereadsitalmostlikeahumanbeing.Themusclesonherfacestretchandrelax﹣andherreactionschange﹣asshecontinuesreading.That'swhymanynewsanchorswereworriedWillAIreplaceusinthenearfuture? TofindtheanswerwehavetoanalysethetechnologiesthatsupportXinatherjob.ThreekeytechnologiesareusedtosupportXin.Firstsamplesofhumanvoicesarecollectedandsynthesised合成.Thisisfollowedbythecollectionandsynthesisofhumanmusclemovementsamples.AndthirdthevoicesandmovementsaremarriedinawaythatwhentheAlnewsanchorreadsthemicro﹣electricmotorsbehindherfacemovetomakeherexpressionsseemmorehuman. Yetweneedathoroughknowledgeofdeepleaningtechnologytomakearobotimitateaperson'svoice.ThedeveloperneedstocollecttensofthousandsofpiecesofpronunciationsinputthemIntothemachineandmatchthemwiththetextortheAltoleanandread.Theprocessforimitatingfacialmovementsissimilar.Thedeveloperhastoanalysethemovementsofthe53musclesinthehumanfacemakeamodelsetfromthecollecteddatafortheAInewsanchortoleanandimitatethemovementsoffacialmusclesviaprograms. BoththetechnologiesusedtomakeXin'sperformanceimpressivearemature.Therealdifficultyliesinthethird﹣thetechnologytomatchthepronunciationswithfacialmovementssothatXinexpressionsvaryaccordingtothecontentofthenewsreport.InfactXinsexpressionsdon'talwayschangeaccordingtothecontent.Asaresultherexpressionslookanythingbuthuman.Actually.AIisstillnomatchforhumanqualities. 1Whatdoestheunderlinedwordreluctantinthefirstparagraphmean? A.Delighted. B.Unwilling. C.Confused. D.Optimistic. 2Whatcanweinferaboutpreviousnewsrobots? A.Theyreadnewswithoutexpressions. B.Theylookedlikeahumanbeing. C.Theycouldinterviewsportsstars. D.Theycouldinteractwithaudience. 3Whatdoweknowaboutthethirdtechnology? A.Thistechnologyisveryperfectsofar. B.Thistechnologyisquitepopularnow. C.Thistechnologyremainsatthetheoreticalstage D.Thistechnologyisfarfrommature. 4Fromthelastparagraphwecandrawaconclusionthat. A.humannewsanchorsshouldlearnfromATanchorstosavetheirjobs. B.Alanchorsperformmuchbetterthanhumannewsanchorsatpresent. C.Alnewsanchorswon'treplacehumannewsanchorsinthenearfuture. D.XinXiaomengsexpressionsvarysonaturallythattheyaretruetolife.
若一个多边形的内角和等于它的外角和则这个多边形的边数为.
对于一个函数自变量x取a时函数值y也等于a我们称a为这个函数的不动点.如果二次函数y=x2+2x+c有两个相异的不动点x1x2且x1<1<x2则c的取值范围是
下列运算结果正确的是
岳阳市整治农村“空心房”新模式获评全国改革开放40年地方改革创新40案例.据了解我市某地区对辖区内“空心房”进行整治腾退土地1200亩用于复耕和改造其中复耕土地面积比改造土地面积多600亩. 1求复耕土地和改造土地面积各为多少亩 2该地区对需改造的土地进行合理规划因地制宜建设若干花卉园和休闲小广场要求休闲小广场总面积不超过花卉园总面积的求休闲小广场总面积最多为多少亩
如图1△AOB的三个顶点AOB分别落在抛物线F1y=x2+x的图象上点A的横坐标为﹣4点B的纵坐标为﹣2.点A在点B的左侧 1求点AB的坐标 2将△AOB绕点O逆时针旋转90°得到△A'OB'抛物线F2y=ax2+bx+4经过A'B'两点已知点M为抛物线F2的对称轴上一定点且点A'恰好在以OM为直径的圆上连接OMA'M求△OA'M的面积 3如图2延长OB'交抛物线F2于点C连接A'C在坐标轴上是否存在点D使得以AOD为顶点的三角形与△OA'C相似.若存在请求出点D的坐标若不存在请说明理由.
Ourteacherstriedteachingusaboutdeathduringnursingtraining.AsastudentnurseIknewIwouldseedeathinmy1.Ihadnoideaofthe2itwouldhaveonme3. ThefirstpersonIsawdiewasanelderlymanJohnwhohadbeen4forweeks.Hisheartwas5andthehealth﹣careteamwaskeepinghimcomfortableand6hissymptoms.Hehadstoppedspeakingdaysbeforebutwasstillawakeattimesandhis7whenwespoketohimwasbeautiful. WhenIcameontothe8onemorningthenightstaffsaidhehaddeteriorated恶化overnightandhad9lefttoleave.AtrainednurseandIgavehimabedbathshavedhimandchangedhissheets.ForthenextsixhoursI10hishandandtalkedtohim.Thedoctorcameinregularlyandaskedifheneededmorepainreliefbutheseemed11mostofthetime.Heonly12openedhiseyestosmileatme.Earlyintheafternoonthenursecamebackinandwewashedhisfaceand13hishair.AsshewasjustabouttoleavetheroomshestrokedhishairandsaidOhJohnjust14.Minuteslaterhedid. Ithasbeen20yearssinceJohn'sdeath.Ihaveseen15deathsinmytimenursing.Ihaveseenstaffgofarbeyondthe16oftheirjobsto17thatapatienthasasgoodadeathaspossible.Iremembersomeoftheotherfacesbutnoneisquiteas18asJohn's.Heandtheprofessionalswhowere19himtaughtmethatit20howwetreatthosewhoaredying. 1A.life B.career C.mind D.family 2A.impact B.difference C.reflection D.affection 3A.instead B.regardless C.therefore D.however 4A.insisting B.challenging C.struggling D.recovering 5A.striking B.failing C.beating D.aging 6A.comforting B.decreasing C.disappearing D.relieving 7A.face B.eyes C.smile D.expression 8A.ward B.classroom C.hospital D.department 9A.days B.hours C.minutes D.seconds 10A.held B.reached C.hugged D.touched 11A.silent B.painful C.peaceful D.anxious 12A.frequently B.occasionally C.hardly D.easily 13A.combed B.tied C.washed D.smelt 14A.comeon B.passaway C.letgo D.goaway 15A.priceless B.constant C.considerate D.countless 16A.qualifications B.ability C.expectations D.exception 17A.pretend B.assume C.believe D.ensure 18A.beautiful B.vivid C.pale D.scary 19A.caringfor B.lookingfor C.bringingup D.cheeringup 20A.trains B.works C.influences D.matters
TheworldfamousBostonSymphonyOrchestranormallyperformsatSymphonyHallinBostonMassachusetts.ButitssummerhomeistheTanglewoodMusicCenterinwesternMassachusetts. TheBostonSymphonyOrchestraalsohasasummerprogramatTanglewood.Itisdesignedforyoungsingersmusiciansandthosewhocreatemusicalworks.GreatcomposerslikeAaronCoplandLeonardBernsteinandJohnAdamshaveworkedThere. SergeKoussevitzkyledtheBostonSymphonyOrchestrain1940.AtthetimeEuropewasatwar.TheUnitedStatesdidnotenterWorldWarIuntiltheendof1941.Mr.KoussevitzkypersuadedpeopleinthemusicindustrytoopenamusicschoolatTanglewoodtheBSO'ssummerhome.Hewantedyounggiftedmusicianstoattendtheschoolforfree. Butwithintwoyearstheprogramalmostcametoanend.TheBSOtrustees托管人wantedtoclosetheschoolbecauseofthewarandKoussevitzkywasangryandwrotealettercallingitan‘actofartisticvandalism损坏'.Andhesaid‘Nowisthetimewhentheworldneedstobehearingthismusic'saysJeremyEichleramusiccriticforTheBostonGlobenewspaper.ThismusicwasnotJustworksbyBeethovenorBrahms.Itwasthesoundsofthetime. Mr.KoussevitzkychosecomposerAaronCoplandtoheadtheschool.InestablishingAaronCoplandastheheadoftheschool﹣﹣notastheheadofcompositionhewasmakingaveryspecificstatement…AndIthinkhefeltverystronglythatpayingattentiontothemusicofone'sowntimeisthewaytoensurethattherewillbeafuturesaysJeremyEichler. PaulHindemithwasarefugee难民fromthewarinEurope.HewaschosenasthefirstheadofTanglewood'smusiccompositiondepartment.HeandCoplanddecidedthattheschoolwouldbeaplacewherecomposerswritenewmusicalworks. TheirfirstperformancewasAlleluiaapiecewrittenbyAmericancomposerRandallThompson.Alleluiahasopenedtheschool'sprogrameverysummersinceitwasfirstperformed.SinceitopenedTanglewood'syoungmusicianssingersandconductorshaveperformedmanynewcompositions.TheyincludethefirstAmericanperformanceofBenjaminBritten'soperaPeterGrimes.Thisyearforits75thanniversarythecenteraskscomposerstowrite34newpiecesofmusic. 1WhathappenedtotheTanglewoodMusicCenter? A.AaronCoplandonceworkedastheheadoftheschool. B.Manyyounggiftedmusiciansattendedtheschoolin1941. C.Itwasclosedin1943becauseoftheWorldWarII. D.ItwascreatedbySergeKoussevitzkyin1940. 2WhichofthefollowingisinagreementwithSergeKoussevitzky'sopinions? A.Thegreatmusicshouldbethereflectionofthetime. B.Theyoungshouldhavethechancetolearnmusicforfree. C.Theheadofamusicschoolshouldbeacomposer. D.Thetraditionalmusicshouldnotbeemphasized. 3ItcanbereferredthattheTanglewoodMusicCenterattachesimportanceto. A.performingnewworkseveryyear B.thecompositionsoffamousmusicians C.workingwithfamouscomposers D.theyoungtalentedmusicianscreation. 4What'sthepassagemainlyabout? A.ThegreatchangestakingplaceintheTanglewoodMusicCenter. B.AbriefintroductiontotheTanglewoodMusicCenter. C.ThedevelopmentoftheTanglewoodMusicCenter. D.TheeventsthatmaketheTanglewoodMusicCenterfamous.
IunderstoodChineseculturesonlyseenonTVandinbooksbutonlymadelittleheadwaylearningChinese.1itdidnotmatter.Thepatiencegenerosityand2ofstrangersleftmepleasantlysurprisedwithBeijing. I3neededChineseOnmybirthdayforexampleIwas4inthecity. EveryoneIknewwasoutoftownsoIdecidedto5adayofitmyself.Iwentshopping.AfterthreehappyhoursIwentconfidentlyuptothe6andforaminuteI7everyonespokeEnglish. Butafter8myitemsthewomanbehindthecounterspokeinChineseandallIcoulddowasstare9.IthoughtshewasaskingcashorcardsoIpulledoutsomenotesbutshe10herhead.Westoodthereforafewminutes11anothercashiersaidAcoupleofyour12arepartofthesaleandcannotbeexchangedor13oncebought. AnotherdayIwenttothepolicestationasIhadlostmywalletina14landDuringthat20﹣minutetalkIrealizedtheeagernessand15ofpeople. SpeakinginamixofChineseandEnglishtheyoungpoliceofficerdidallhecouldtoputme16.Heknewthatasforeignerswewerenervousatthepolicestationsohesmiledandspoke.Intheendthe17tookacoupleofhoursandthewalletdidnot18anymore.Ihadmadeafriend. Therearemany19andunforgettablememoriesofgettingbywithout20butperhapswithoutthefriendshelpBeijingmaynothavebeensoeasytonavigate. 1A.Lastly B.However C.Instead D.Thus 2A.sacrifice B.Efforts C.Warmth D.promise 3A.rarely B.Basically C.completely D.totally 4Astill B.even C.only D.alone 5A.make B.need C.do D.plan 6A.exit B.store C.counter D.hall 7A.realized B.recognized C.guaranteed D.assumed 8Aringingup B.showingup C.assessing D.examining 9A.poorly B.helplessly C.quickly D.patiently 10A.waved B.nodded C.shook D.hung 11A.until B.as C.after D.for 12A.expenses B.purchases C.supplies D.parcels 13A.accepted B.canceled C.returned D.broken 14A.foreign B.same C.different D.new 15A.happiness B.wisdom C.excitement D.kindness 16A.forsure B.atease C.inorder D.inplace 17A.incident B.procedure C.question D.survey 18A.matter B.stay C.change D.return 19A.interesting B.amusing C.pleasant D.admiring 20A.cellphone B.policeofficers C.Chinese D.cashiers
慈氏塔位于岳阳市城西洞庭湖边是湖南省保存最好的古塔建筑之一.如图小亮的目高CD为1.7米他站在D处测得塔顶的仰角∠ACG为45°小琴的目高EF为1.5米她站在距离塔底中心B点a米远的F处测得塔顶的仰角∠AEH为62.3°.点DBF在同一水平线上参考数据sin62.3°≈0.89cos62.3°≈0.46tan62.3°≈1.9 1求小亮与塔底中心的距离BD用含a的式子表示 2若小亮与小琴相距52米求慈氏塔的高度AB.
Whilesmartphonesstandaccusedofavarietyofcrimesthesepocketcomputerscancertainlybeaforceforgood.Yourphoneisalwayswithyoumakingittheperfectdevicetopushyouintoamorebeneficialwayofliving.Herearesomeofthebestappsthatcanhelp. Habitica Habiticaturnsthegoalofforminggoodhabitsintoagamewithitsowncharactersandscoring.It'salotoffunandtheappalsoletsyoubuildhabitswithfriendsandfamily.Inadditiontoregularrepeatinghabitsyoucanaddamoregeneralto﹣dolistandtherewardsyougetcanbecustomizedtoo﹣youcouldtreatyourselftoamealoutoranextrahourofgames. SmokeFree Ifyou'vegotaspecifichabitinmindthenyou'llusuallyfindspecificappstohelplikeSmokeFree.Ifyou'redeterminedtogiveupsmokingthenthisisoneofthemostcomprehensiveappsforgivingyouthatextrapushyouneedtomakeapermanentchange.Theappoffersahostofusefulfeaturesforpeoplewantingtogosmoke﹣freeTheabilitytoseeyourprogressovertimechartsshowinghowyourhealthisimprovingday﹣by﹣dayencouragementandsomeadviceontechniquesforgivingupsmoking. MyFitnessPal YoucanfindatonofhealthandfitnessappsforyourphonebutMyFitnessPalstandsoutnotjustbecauseitiseasytousebutbecauseitmakespracticalsuggestionsforyou.Itcantakeinahostofdatafromthecalories卡路里you'retakingintothenumberofswimsyou'redoingperweekandofferreportsoncalorieconsumptionandmacronutrient大量营养素breakdown. 1WhatcanHabiticahelpyoutodo? A.Winatoughgame. B.Startalastingfriendship. C.Findafancyrestaurant. D.Developapleasanthabit. 2WhichofthefollowingcanSmokeFreeprovide? A.Thefreedomtosmoke. B.Theabilitytomakeprogress. C.Adviceonhowtoquitsmoking. D.Chartsaboutyourexcellenthealth. 3Whatcanwelearnaboutthethreeappsmentionedinthetext? A.They'recheap. B.They'repractical. C.They'refree. D.They'reinteresting.
如图抛物线y=ax2+bxa>0过点E80矩形ABCD的边AB在线段OE上点A在点B的左侧点CD在抛物线上∠BAD的平分线AM交BC于点M点N是CD的中点已知OA=2且OAAD=13. 1求抛物线的解析式 2FG分别为x轴y轴上的动点顺次连接MNGF构成四边形MNGF求四边形MNGF周长的最小值 3在x轴下方且在抛物线上是否存在点P使△ODP中OD边上的高为若存在求出点P的坐标若不存在请说明理由 4矩形ABCD不动将抛物线向右平移当平移后的抛物线与矩形的边有两个交点KL且直线KL平分矩形的面积时求抛物线平移的距离.
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限一词 2.只允许修改10处多者从11处起不计分. Achemicalfactoryliesnearmyhome.Themanagerofthefactorywascriticizedbythegovernmentbecausethefactorygivesoutlotsofharmfulsmokeoneverydaybuthepaidnoattention.ThenthefactorywasforcedtostopproductionandthemanagersaidangryIsthereanyevidencestoshowthatwedidharmtopeople'shealth?Infactwedid't.Justthendoctorcamewiththeresultofthemedicalexamsaythemanagerwassufferingfromlungcancer.Thatisveryclearthatthepollutionhasharmednotonlythepeoplearoundthefactoryandalsothemanagerhimself.Themanagerregrettedhavingcausedsomanypollution.Nowhehasrealizedwhatimportantitistokeeptheairclean.
如图AB为⊙O的直径点P为AB延长线上的一点过点P作⊙O的切线PE切点为M过AB两点分别作PE的垂线ACBD垂足分别为CD连接AM则下列结论正确的是.写出所有正确结论的序号 ①AM平分∠CAB ②AM2=AC•AB ③若AB=4∠APE=30°则的长为 ④若AC=3BD=1则有CM=DM=.
如图在菱形ABCD中点EF分别为ADCD边上的点DE=DF求证∠1=∠2.
已知x﹣3=2则代数式x﹣32﹣2x﹣3+1的值为.
ForseveralmonthsCarahasbeenworkingupthecouragetoapproachhermomaboutwhatshesawonInstagram.Notlongagothe11﹣year﹣oldgirllikealltheotherkidsinthisstorydiscoveredthathermomhadbeenpostingherphotosformuchofherlife.I'vewantedtobringit.It'sstrangetoseemyselfupthereandsometimestherearepicturesIdon'tlikeofmyselfshesaid. LikemostothermodernkidsCaragrewupimmersedinsocialmedia.Whilemanykidsmaynotyethaveaccountsthemselvestheirparentsschoolssportsteamsandorganizationshavebeenorganizinganonlinepresenceforthemsincebirth.Theshockofrealizingthatdetailsaboutyourlifehavebeensharedonlinewithoutyourpermissionorknowledgehasbecomeanimportantexperienceinthelivesofmanyteenagers.Recentlyaparentingblogger博主wroteinaWashingtonPostessaythatdespite不顾her14﹣year﹣olddaughter'shorroratdiscoveringthathermotherhadsharedyearsofhighlypersonalstoriesandinformationaboutheronlineshesimplycouldnotstoppostingonherblogandsocialmedia.ThewritersaidthatpromisingherdaughterthatshewouldstoppostingaboutherpubliclyontheInternetwouldmeanshuttingdownavitalpartofmyselfwhichisn'tnecessarilygoodformeorher.averageparentsdothesame.There'sevenaspecialwordforitsharenting. AlmostaquarterofchildrenbegintheirdigitalliveswhenparentsuploadtheirphotostotheInternetaccordingtoastudyconductedbytheInternet﹣securityfirmAVG.Thestudyalsofoundthat92percentofkidsundertheageof2alreadyhavetheirownuniquedigitalidentity. 1HowdoesCarafeelabouthermom'sbehavior? A.It'saggressive. B.It'sappropriate. C.It'sannoying. D.It'sfavorable. 2Whydidtheparentingbloggerpostaboutherdaughteronline? A.Becauseitfilledupherblog. B.Becauseitshowedoffhersuccess. C.Becauseitrecordedherstories. D.Becauseitmeantalottoher. 3Whoarefondofsharenting? A.Aquarterofstudents. B.Mostordinaryparents. C.Kidsundertheageof2. D.Somecrazybloggers. 4Whichofthefollowingcanbethebesttitleforthetext? A.Children'sNewTrouble B.SocialMedia C.Kids'OnlinePeformance D.MommyBloggers
OnJanuary252020overabillionpeopleinChinaandmillionsaroundtheworldwillcelebratetheChineseNewYearortheSpringFestival.Theancienttradition1dateisdeterminedbythelunarcalendarandfallssomewherebetweenJanuary21andFebruary20eachyearisthe2longandmostimportantofallChinesefestivals. Thepreparationswill3officialbeginwithLittleYearonJanuary172019.Itisobservedwithadayofmemorialandprayerceremonies.OtherLittleYearactivitiesincludecleaningthehouse4sweepawaybadluckandhangingspringcouplets﹣﹣reddecorationshunginpairs﹣ondoorwaysforwealth.Sincered1believetokeepmisfortuneandevilspiritsawayitcanbenoticedineverythingfromclothingto6lanternusedtodecoratehouses. Often7considerthemostimportantmealoftheyearthereuniondinnerisbothdeliciousandrootedinChinesetradition.8wholechickensymbolizesfamilytogethernesswhilelonguncutnoodlesshowlongevity长寿•Wealthisrepresentedbydumplingsandspringrolls.Childrenreceiveredenvelopesfilled9moneyandinspiringmessagesfromeldersandareoftenallowedtostayuplatetowatchthe10amazefireworksshows. Thetwo﹣weeklongcelebrationswillendonFebruary8﹣thedayofthefullmoon﹣withtheLanternFestival.
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. LastyearZhangPingyupaidvisittoLondon.WorriedaboutthetimeavailableZhangPingyuhadmadealistofthesiteshewantedtosee.ItwastheTowerwhichshevisitedfirst.Fancy!Thissolidstonesquaretowerhadbeenremainedstandingforonethousandyears.Manynewbuildingshadexpandedaroundit.Thereforeitwasstillpartofaroyalpalaceandprisoncombined.TherefollowedStPaul'sCathedralbuiltaftertheterriblefireofLondonin1666.Itlookedsplendidlywhenfirstbuilt.WestminsterAbbeytoowasveryinteresting.ThenjustashecameoutoftheabbeyPingyuheardthefamoussoundoftheclockBigBenringoutthehour. ThenextdayPingyuwasleavingLondontoWindsorCastle.PerhapsIwillseetheQueen?shewonderedasshefallasleep.
KentuckyFriedChickenhaslaunchedanewthemedbranchinhonorofLeiFengalegendarysoldier1celebrateinChinaforhis2selfandmodestyinhishometownChangshaHunanprovince. TherestaurantopenedonSundaytwodaysbeforethe3officeremembrancedaymarkedacrossthecountryeveryyearonMarch54peoplecelebratehisspiritsbyshowinggoodwillandgiving5helpinghandtoothers. TherestaurantwillorganizeseriesofactivitiesandalsocooperatewiththelocalLeiFenMemorialHallto6wellpromoteLeiFeng'sspirits.7theentrancetotherestaurantstandtwobigLei﹣likestatuesanditsinnerpart8decoratewithLei'scartoonportraitsandquotesfromhisdiarywithwordsfromhispoemsplayinginthebackground. HeMingeneralmanagerofKFCinHunanprovincetoldvoc.com.enthatinadditiontothethemedrestauranttheywillalsolaunchaprojectdevotedtoLei'svirtuesin250outlets门店acrosstheprovinceincluding9providefreedrinkingwaterandresting10placeforgateguards
2018年12月26日岳阳三荷机场完成首航.至此岳阳“水陆空铁”四位一体的交通格局全面形成.机场以2020年为目标年计划旅客年吞吐量为600000人次.数据600000用科学记数法表示为.
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