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实验是进行科学探究的重要方式，某同学设计如图所示实验，探究二氧化碳的有关性质．请填空： （1）实验1采用科学探究中的控制变量法，该实验控制的变量是 ． （2）实验1中干石蕊纸花喷水后放入二...
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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：
在探究水对种子萌发的影响时A.B.两组同学分别进行了实验设计主要实验设计如下图所示1本实验的变量是_
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
同学们在做比较水和沙子的吸热能力实验的场景如图所示他们说该实验有两种探究方法1实验方法一的设计如图中
在探究水对种子萌发的影响时A.B.两组同学分别进行了实验设计主要实验设计如下图所示⑴本实验的变量是_
实验是进行科学探究的重要方式某同学设计如图所示实验探究二氧化碳的有关性质.请填空1实验1采用科学探究
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：
实验是进行科学探究的重要方式某同学设计如下图所示实验探究二氧化碳的有关性质请填空1实验1采用了科学探
在探究水对种子萌发的影响时A.B.两组同学分别进行了实验设计主要实验设计如下图所示1本实验的变量是_
在探究水分对种子萌发的影响时A.B.两组同学分别进行了实验设计主要实验设计如图所示1本实验的变量是_
科学探究铁铜银是课本上学过的三种金属实验设计如图所示请回答1猜想该实验在探究的问题是2所用的科学探究
实验是进行科学探究的重要方式某同学设计如下图所示实验探究二氧化碳的有关性质实验1实验2请填空1实验1
在探究水对种子萌发的影响时A.B.两组同学分别进行了实验设计主要实验设计如下图所示1本实验的变量是_
实验是进行科学探究的重要方式某同学设计如图所示实验探究二氧化碳的有关性质请填空请填空1实验1采用了科
在探究水对种子萌发的影响时A.B.两组同学分别进行了实验设计主要实验设计如下图所示1本实验的变量是2
实验是进行科学探究的重要方式某同学设计如下图所示实验探究二氧化碳的有关性质请填空1实验1采用了科学探
实验是进行科学探究的重要方式某同学设计如下图所示实验探究二氧化碳的有关性质实验1实验2请填空1实验1
在探究水分对种子萌发的影响时A.B.两组同学分别进行了实验设计主要实验设计如下图所示1本实验的变量是
在探究水分对种子萌发的影响时A.B两组同学分别进行了实验设计主要实验设计如下图所示1本实验的变量是.
实验是进行科学探究的重要方式某同学设计如下图所示实验探究二氧化碳的有关性质请填空1实验1采用了科学探
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食盐食醋纯碱等均为家庭厨房中常用的物质利用这些物质你能做成的实验是 ①检验自来水中是否含有氯离子 ②鉴别食盐和纯碱 ③检验鸡蛋壳能否溶于酸 ④除去热水瓶中的水垢．
如图表示治理汽车尾气所涉及反应的微观过程．下列说法不正确的是
下列情况①煤的燃烧②工业废气的排放③燃放鞭炮④用汽油为燃料的汽车尾气的排放⑤用氢气为燃料的新型燃气车排放的尾气．会引起空气污染的是
Tomorrowbringstoacloseofthesecondschooltermofthe2018academicyearandthestartofthewinterschoolholidays.Followingabusyexaminationperiodthisisamuchneededbreakformanystudentsacrosstheprovince. WednesdayJanuary6IceSkating Welcometotheworldoficeforourfirstcold﹣weathereventoftheseason!Whetheryouareaprofessionaliceskaterorthiswillbeyourfirsttimeontheiceyouareguaranteedtohaveafantastictime! WednesdayJanuary13CollegePreparedness2.0 AlthoughmostofthestressofapplyingforcollegethisyearisoutofthewaythisCollegePreparednessworkshopwillhelpyoutakeotherthingsintoconsideration.Applicationdeadlinesforfinancialaidaredrawingnearandwearebringingintheexpertstohelpyouthroughallofthespecificdetails.ThisworkshopwillhelptobestprepareyouforscholarshipsworkstudyandstudentloansthatwillmakepayingforcollegeeasyasA﹣B﹣CDo﹣Re﹣Miand1﹣2﹣3. WednesdayJanuary27EcologicalRiskAssessmentofYourLife/Home Therearesomanywarningsoutthereaboutwhatyoushouldandshouldnotputinyourbodyanduseinyourhome.Thisworkshophelpsmakesenseofitall.Cometofigureouthowtoliveyourhealthiestpossiblelifewithoutspendingatonofmoney. WednesdayFebruary3WinterSurvivalinAnySituation Livingintheoutdoorswithminimalequipmentisaskillandanart.Itisparticularlychallengingwhentheoutsidetemperaturesreachwinterlows.Thewintersurvivalworkshopwillshowyousomeoldtricksofthetradeforsurvivingoutsideincoldtemperaturesandhowtomakeprimitivefires. WednesdayFebruary10BestFriendEver Highschoolistemporarybutthefriendshipsyoumakecanbeforever.Howdoyoumakearelationshiplast?Learnhowtobethebestfriendyoucanbeinthisinteractiveworkshop. 1Asawintersportsloveryoumaychooseanevent. A.onWednesdayFebruary10 B.onWednesdayFebruary3 C.onWednesdayJanuary13 D.onWednesdayJanuary6 2WhatisthefocusoftheeventonJanuary27? A.Health. B.Education. C.Friendship. D.Entertainment. 3Whoaretheintendedreadersofthepassage? A.Teachers. B.Athletes. C.Students. D.Tourists.
Filmsandcomputergames Injustafewdecadesthegamingindustryhasbecomemuchbiggerthanthefilmbusiness.WhatiscalledinteractiveentertainmentmakesmoremoneythanHollywoodcinema.Isthereanywayofmakingfilmsmoreappealingtopeoplewholiketoplaycomputergames? Makingafilmoutofabest﹣sellingcomputergamecanguaranteealargeaudience.1Nowadaysfilmsaremadewithsimilarones.Theyhaveattractiveactionscenesrelyingonfantasyeffectsaswell.Gamingmarketsconsistofscience﹣fictiongamesandfilm﹣makershavealsosetfilmsinscience﹣fictionworlds.2Anyattempttoborrowmorethanthesettingfromagameiscertaintofail. Whydogamersfeeldisappointedbyfilmsbasedontheirfavoritegames?Oneofthereasonsistechnical.Noweverythingcanbecomputer﹣produced.3Howeverfilmingascenefrom20differentcameraswouldcostafortunesoitsimplyisn'tdoneinthefilmversion﹣leavingthegamersfeelingthatthefilmdidn'tlookasrealasthecomputergame. 4Inafilmthedirectordoesn'tshowyousomethingstokeepyouhavethefeelingofexcitementoranxiety.Forexampleyouwouldn'tbeinterestedinwatchingthefilmifyouknewtheidentityofthemurderer.Butthisisnottrueforcomputergames.Whenyouplayagameyouhavetodocertaintaskstocontinuetothenewlevel.5Youarealwaysincontrolasaplayerwhileinthecinemayounevercontroltheaction.Youjustsitandwatch. Therecanbesomeinteractionbetweenfilmsandcomputergamesondifferentlevels.Forallthesimilaritiesbetweentechnologiesandspecialeffectsweshouldn'tforgetthatastoryandagamearefundamentallydifferent. A.Camerasmatterinanothersensetoo. B.Thesuccessofagameusuallyliesintheuseofspecialeffects. C.Youcan'tinfluencewhathappensatallinthecomputergames. D.Computergamesmayshowtheactionfromanumberofviewseasily. E.Thegamehasagoodchanceofbeingassuccessfulasthefilmonwhichitisbased. F.Youmustbeabletohaveaccesstoalltheinformationinordertodecidewhattodonext. G.Howeverthedifficultyforfilmproducersappearstobeknowingwhereandwhentostop.
OvertourismAgrowingglobalproblem Thesummerholidaysareinfullswing﹣andprotestsagainstovertourismhavebeguninanumberofpopularEuropeancities.Barcelonainparticularisatthecentreofthesemountingconcernsabouttherapidgrowthoftourismincitiesespeciallyduringpeakholidayperiods.Infacttherewere30millionovernightvisitorsin2017comparedtoaresidentpopulationof1625137inBarcelona. Whilemanytouristswanttolivelikealocalduringtheirvisitstheresidentsofmanytourism﹣dependentdestinationsareseeingtheuniquesenseofplacethatcharacterisedtheirhometownsvanishbeneathawaveofsouvenirshopscrowdstourbusesandnoisybars.Overtourismisharmingthelandscapedamagingbeachesandpricingresidentsoutofthehousingmarket.Itisahugelycomplexissuethatisoftenoversimplified. Itcanhaveanimpactinmultipleways.Theinternationalcruise游轮industryforexampledeliversthousandsofpassengersdailytodestinationports.Whilecomparativelylittleisreturnedtocommunitiescruiseactivitycreatesphysicalandvisualpollution. Cityresidentsalsobearthecostoftourismgrowth.Ascitiestransformtoofferservicetotouriststheglobaltravelsupplychainadvances.Thisgoeswithincreasingpropertyspeculation房产投机andrisingcostsoflivingforlocalcommunities.Airbnbforexamplehasbeenaccusedofreducinghousingaffordabilityanddisplacingresidents. Inadditionovercrowdingandtheestablishmentoftypicaltourism﹣focusedbusinessessuchasclubsbarsandsouvenirshopsoverpowerlocalbusinesses﹣andnoisyandunmanageabletouristbehaviouriscommon.Thisweakenstheuniquenessofdestinationsandleadstocrowdandwastemanagementpressures. Clearlytourismbringsjobsinvestmentandeconomicbenefitstodestinations.Butovertourismoccurswhentourismexpansionfailstoacknowledgethattherearelimits.Localgovernmentandplanningauthoritieshavesofarbeenpowerlesstodealwiththeirresistibleinfluenceoftheglobaltourismsupplychain.Thishasledtowidespreadtourist﹣phobia﹣firstdescribedbyManuelDelgadomorethanadecadeagoasamixtureofrejectionmistrustanddisrespectfortourists. Dealingwithovertourismmustnowbeapriority.Managingtheflowoftouristsseemsanimprobableandunwelcometask.Butsomecitieshavetakenextrememeasurestolimittheeffectsofovertourismincludingtheintroductionofneworrevisedtaxationarrangementsfineslinkedtonewlocallawsanddemarketingwherebydestinationsfocusonattractingfewerhigh﹣spendingandlowimpacttouristsratherthanlargegroups. Overtourismisasharedresponsibility.Cityadministratorsanddestinationmanagersmustacknowledgethattherearedefinitelimitstogrowth.Puttingthewellbeingoflocalresidentsabovetheneedsoftheglobaltourismsupplychainisvital.Primaryconsiderationmustbegiventoensuringthatthelevelofvisitationfitswithinadestination'scapacity.Weneedtourgentlyrethinkthewaycitiesareevolvingtoupholdtherightsoftheirresidents. 1WhyisBarcelonamentionedinParagraph1? A.Todescribehowuniquethecityis. B.Towarnpeopleawayfrompopularcities. C.Toshowhowcrowdedadestinationcanbe. D.Tocomparethenumberofvisitorstothatoflocals. 2Whatistheproblemofovertourism? A.Ithasdestroyedlocalbusinesses. B.Ithasledtohigherlivingexpenses. C.Ithasincreasedtheunemploymentrate. D.Ithascausedmistrustamonglocalcommunities. 3Thereasonforovertourismisthat. A.destinationsmisjudgetheircapacity B.touristslackasenseofresponsibility C.governmentsfailtosupportthesupplychain D.tourists'travellingpreferenceisoversimplified 4Accordingtothewriterwhatshouldthelocalgovernmentsdo? A.Takefulladvantageoftourism. B.Guaranteelocalpeople'swelfare. C.Advocateabanonglobaltourism. D.Controltourism﹣relatedbusinesses.
TheSTAREcoStationisanenvironmentalsciencemuseumawildliferescuecenterandashelterforendangeredandillegally﹣tradedforeignanimalsconfiscated没收bytheU.S.FishandWildlifeService.ItcarriesoutthemissionPreservationthroughEducationbyeducatingvisitorsaboutthepreservationoftheenvironmentandtheinter﹣dependenceofalllivingthings. Fieldtrips STAREcoStationhostsfieldtripsforschoolsandcampsthroughoutSouthernCalifornia.Eachfieldtriplaststwohoursconsistingofaone﹣hourgatheringandaone﹣hourtourofthefacilitywithlessonsassociatedwithCaliforniaStateScienceStandards. Throughoutthefieldtripstudentslearnaboutthelatestdevelopmentsinenvironmentalprotectionandthewaysinwhichwildlifeinteractswithvariousecosystems.Thestudentsalsoreceiveanup﹣closeandhands﹣onexperiencewithourrescuedforeignwildlife.Thetourincludesdifferentenvironmentalexhibitsthatshowcasethewaysstudentscanhelpprotectanimalsinthewild. Fieldtripsareofferedonweekdaysonlyfrom10a.m.﹣12p.m.or12p.m.﹣2p.m.Therateis＄6pervisitorbothchildandadultwitha＄120minimum.Weofferonefreeadultper10childrenforgroupsof40ormore.Maximumcapacityis120peopleperfieldtrip. Publictours GuidedtoursoftheSTAREcoStationintroducevisitorstoovertwohundredrescuedforeignwildlife.EachtourisledbyanEcoStationstaffmemberandfeaturesfunanimalfactshands﹣onanimalencounterssurprisingrescuestoriesenvironmentalexhibitsandoriginalapproachestogoinggreen.Visitorsmayonlyseetheanimalsonaguidedtourforbothyoursafetyandthesafetyofouranimals. Theguidedtourlastsapproximately45﹣60minutes.Visitorsareservedonafirst﹣comefirst﹣servedbasis.Noreservationsarerequired.Howevertoursmaysellout.Wesuggestlargergroupsscheduleaprivatetour. Note Ourregularpublictourstimesaresubjecttochangewithoutnotice.Pleasecallinadvanceforthemostup﹣to﹣dateinformation. 1TheSTAREcoStationaimsto. A.helpresearchwildlifeabroad B.collectmoneyforanimalshelters C.raiseawarenessofwildlifeprotection D.provideaknowledgeofunusualanimals 2Whatcanstudentsdoduringafieldtrip? A.Makeaspeechontheenvironment. B.Takepartinforeignwildliferescue. C.Gettoknowwhyspeciesgetendangered. D.Learnhowlivingthingsaffecteachother. 3Foraguidedtourvisitorsshouldknowthat. A.largegroupsareservedfirst B.itisavailableonweekdays C.itstimecouldchange D.bookingisneeded
下列实验方案设计不合理的是
假设你是红星中学高三学生李华请根据以下四幅图的先后顺序写一篇英文周记记述春节期间你幸运地参加故宫过大年活动的全过程. 注意词数不少于60. 提示词微信朋友圈WeChatcircle LED展示屏LEDdisplayscreen
MybulletinboardwascoveredwithpicturesofCarmenandmeatCampFlamingRock.Everysummerforthepastfiveyearswehadbeencampbunkmates室友.Weweregreat1soIwasexcitedtobereturningtocampforanotherfunsummertogether. Youcanimaginemy2whenIgottotheCampanddiscoveredthatIwouldbunkwithKaitlyn.3couldKaitlynandIbunktogether?Wewereliketheoppositeendsofamagnet磁铁.ItwashardtoimaginethatIwould4twoweekswithherasmybunkmate. WhenIdragged5tooursmallwoodenhouseKaitlynwasalreadyatthebunk.Shewassortingherbelongingscompletely6me.Fortherestofthedayneitherofusspoke.Itwasobviousthatshewas7happieraboutthearrangementthanIwas. AtCampFlamingRockyourbunkmateisalsoyour8fordailyactivities.ThatmeantKaitlynandIwouldbetogetheralldaylong.Atfirstwetendtoavoideachother.Butasthedayspassedonbothofourattitudesstartedto9.WhileonedaymyhandwashurtinaboatraceKaitlynrowedtherestofthewayallbyherself.Whenwegottotheshoreshewasallwetwith10.Butshedidn'tcomplain抱怨shejustwalkedwithmetothenursestation.Anotherdayweplayedagamebasedon11.IwasblindfoldedandhadtofindmywaytoKaitlynby12tothesoundshemade.Whenshestartedmakingthesnoring打鼾noisesIhadbeenhearingeverynightIwasabletofindher13notime.Assoonastheblindfoldcameoffwebothlaughedloudly. Overtimeaswebeganto14uptoeachotherIstartedtoseehowKaitlynandIwerereally15.Webothlovedsingingwebothhadannoyinglittlebrothersandweboth16onsleepinginwoolensocks. Theendofthecamprolledaround17thaneitherofuscouldhaveimagined.Wewereboth18atwhatclosefriendswehadbecome.AlthoughI19bunkingwithCarmenI'mgladImadeanotherclosefriend.Nowthere'sanew20onmybulletinboardathome.It'sofmeandKaitlyn.Andbothofusarewearingwoolensocks! 1A.friends B.students C.players D.campers 2A.delight B.relief C.shock D.curiosity 3A.Why B.How C.When D.Where 4A.waste B.give C.lose D.spend 5A.easily B.slowly C.eagerly D.suddenly 6A.ignoring B.frightening C.attracting D.bothering 7A.even B.still C.far D.no 8A.partner B.reporter C.model D.guide 9A.work B.understand C.change D.regain 10A.water B.sweat C.blood D.paint 11A.looks B.words C.gestures D.sounds 12A.listening B.dancing C.awaking D.relaxing 13A.at B.by C.in D.from 14A.make B.open C.come D.play 15A.alike B.popular C.strong D.young 16A.tried B.relied C.carried D.insisted 17A.better B.harder C.faster D.later 18A.mad B.angry C.disappointed D.surprised 19A.minded B.enjoyed C.missed D.imagined 20A.name B.picture C.design D.form
如图中MN分别表示二种固体物质不含结晶水的溶解度曲线试根据图中曲线判断下列说法正确的是
OnDecember262004hundredsoftouristsrelaxedonSriLanka'sYalaNationalPark'sbeaches.Butatmid﹣morningthepark'selephantsbegancryingwildlyandrunningawayfromtheoceanandupanearbyhill.Thepuzzledkeeperscouldtelltheanimalswereworriedaboutsomethingbutwhat? Whatthekeepersdidnotknowwasthata30﹣footwallofwaterwasheadedstraighttowardthem.Thistsunami海啸hadbeencausedbyanearthquakemorethan1000milesawayintheIndianOcean.Whenthehugewavehitthecoastitcausedseveredamage.Manypeopledied.Theelephantshoweverwerenotsweptawaybythewater.Theystoodsafelyonthehill. Scientistshavelongsuspectedthatanimalssensenaturaldisastersbeforehumansdo.Peoplehavetoldstoriesofdogsrefusingtogooutsideandsharksswimmingtodeeperwatersbeforeahurricane.Afterthe2004tsunamipeoplesaidtheysawtigersmonkeysandwaterbuffaloescapingtohighergroundbeforethewatersrushedin.Eveninthehardest﹣hitareasofsouthernAsiatherewerefewanimaldeaths. It'sunlikelythatananimal'sso﹣calledsixthsensecomesfromsomemagicalpowertoseeintothefuture.Expertsbelievethatanimalsmaybemoresensitivethanhumanstochangesintemperatureandotherenvironmentalconditionsthattakeplacebeforeanaturaldisaster.TheelephantsinSriLankaforexamplemayhavepickedupvibrationsfromwithintheEarthasignthatearthquakewascoming.Becausevibrationsinthegroundtravelmuchfasterthananoceanwavetheelephantsmayhavefelttheearthquakethatcausedthetsunamiwellbeforethetsunamiitselfcametothecoast. Afewscientistsarecallingforasystemtotrackreportsofstrangebehaviorinpeople'spetshopingthatthesereportscanserveasawarningsystemthatanaturaldisasterisabouttohappen.ButMarinaHaynesananimalbehaviorscientistatthePhiladelphiaZoosaysItwouldbeanunreliablewaytopredictdisasters.Itcanbedifficulttoknowwhatananimalisdoing.Istheanimalnervousbecauseanearthquakeisabouttohappenorisitfrightenedbecausethereisanenemynearby? 1WhathappenedtotheelephantsinYalaNationalParkonDecember262004? A.Theydiedinthenaturaldisaster. B.Theyweredisturbedbythetourists. C.Theymovedfromthehilltotheseaside. D.Theybehavedstrangelybeforethetsunami. 2Theauthorsupportshispointofviewinparagraph3mainlyby. A.givingexamples B.makingcomparisons C.tellinginterestingstories D.showingresearchfindings 3Theunderlinedwordvibrationsinparagraph4means. A.changesintemperature B.akindofchemicalpower C.continuousshakingmovement D.seriousenvironmentalpollution 4WhatmaybeMarinaHaynes'attitudetowardsthewarningsysteminthelastparagraph? A.Positive. B.Doubtful. C.Hopeful. D.Supportive.
图中甲乙丙是三个实验的示意图根据图中所发的化学反应现象及化学反应原理进行总结归纳并回答下列问题 1所发生的三个反应有多少共同的特点分别是① ②③④ 2甲实验进行时燃烧匙中硫的状态是． 3任选上述三个实验中的一个写出反应的化学方程式．
依据如图进行实验夹持仪器略去．实验过程 ①通入N2点燃酒精灯一段时间后ab中均无明显现象 ②改通O2片刻熄灭酒精灯后b中红磷燃烧． 下列说法错误的是
钛和钛的合金被认为是21世纪的重要材料它们具有很多优良的性能如熔点高密度小可塑性好易于加工钛合金与人体有很好的“相容性”．根据它们的主要性能下列用途不切合实际的是
如图中“一”表示相连的物质间在一定条件下可以反应“→”表示甲在一定条件下可转化为乙．下面四组选项中符合如图要求的是
假设你是红星中学学生李华.你的美国朋友Jim在给你的邮件中询问你的高三生活情况.请你给他回复邮件内容包括 1.近况 2.感受 3.愿望. 注意1.词数不少于50 2.开头和结尾已给出不计入总词数. DearJim Yours LiHua
Inthe1960sDouglasEngelbartwithhelpfromhisfriendBillEnglishinventedthefirstcomputermouse.Engelbart'sinventionwasasimplewoodenboxwithonebuttonandtwowheelsthatrolleddirectlyonahardsurfacesuchasadesk.Thetermmousecamefromthefactthatthisdevicetoolhadlongthinwiresattachedtoitssmallbodythatmadeitlookabitlikeacommonmouse.Thenamestuckandhasbeenusedeversince. ForyearsafterEngelbart'sinventioncomputersstillreliedoncommandstobetypedinviakeyboards.ItwasnotuntilcomputersbegantousegraphicaluserinterfacesGUIs图形用户界面thatmousesbecamepopularaspointingandinputdevices.GUIsrelyoninteractionswithimagesratherthantextcommands.Forexampletoopenaparticularprogramyounolongerhavetotypeacommand.Allyouhavetodoisclickonaniconwhichisatinypictureusedtopresentaparticularprogramorcomputerfunction.WhenpointingandclickingviaGUIsbecamepopularcomputermousesbecamecommonplace. Today'scomputersrelyonhighly﹣sophisticatedGUIsthatrequirefinemotorcontrolofacursor光标onadisplay.Thereisalsotouchscreentechnologywhichisusedonmanymobiledevicessuchassmartphonesandtablets.Computermousesuseadvancedrollingballsorlasers激光totranslatethemovementofthehandcontrollingthemouseintomovementofthecursoronthecomputerdisplay. Manycomputermouseshavemultiplebuttonsaswellasspecialfeatureslikewheelstoallowuserstoperformmultiplefunctionsatonce.Forexampleclickingtheleftbuttonofamousemightpositionthecursoratacertainpointwithinadocumentorwebpagewhileclickingtherightbuttonofamousemightbringupanin﹣contextmenuofpossibleactionstoperform.Specialfeaturessuchaswheelscanallowausertoscrollquicklyupanddownawebpage. Anotherthingyoumightnoticeaboutlater﹣modelcomputermousesmanyofthemhavelosttheirtails!Likesomanyotherelectricaldevicesthathavegonewirelesssohavemanyversionsofthecomputermouse.Wirelessmousessenddataviainfra﹣redradiationorradiowaves. 1WhatdoweknowaboutEngelbart'sinvention? A.Ithadnowires. B.Ithadtwobuttons. C.Itwashardtooperate. D.Itwasnotwidelyusedatthebeginning. 2AccordingtothearticlehowdidGUIshelptheuseofmouse? A.GUIsstillneedkeyboardstotypecommands. B.UserscandowhateverthingswithmousesviaGUIs. C.Usingamousepeoplenolongerneedtoinputinformationintoacomputer. D.GUIsbasedoniconsandmenusaremoreconvenientforamousetooperate. 3Alasermouseuseslasersto. A.openaprogram B.touchthecomputerscreen C.trackthemouse'smovement D.locatethecursoratacertainpoint 4Whichofthefollowingcanbethebesttitleforthepassage? A.TheSciencebehindtheComputerMouse B.TheDevelopmentoftheComputerMouse C.TheInventoroftheFirstComputerMouse D.TheFirstComputerMouseUsedintheWorld
下列成语中一定包含有化学变化的是
假设你是李华你们社区将举办中国民间音乐节.请你给在北京学习的英国朋友Jim写封电子邮件邀请他来参加此次活动.内容包括 1.活动的时间地点 2.活动的内容 3.邀请的理由. 注意1.词数不少于50 2.开头和结尾已给出不计入总词数. 提示词社区community 中国民间音乐节ChineseFolkMusicFestival DearJim Yours LiHua
下列有关生活常识的说法中正确的是
测定Cu﹣Zn合金及Cu﹣Ag合金中铜的质量分数实验室只提供一瓶未标明质量分数的稀盐酸和必要的仪器． 1你认为能测出其铜的质量分数的是合金． 2小华取该合金的粉末65g与足量该盐酸充分反应经测定产生了0.4g气体请求出该合金中铜的质量分数．
地壳中元素含量质量分数由高到低依次是氧硅铝铁等．如图分别是硅元素在元素周期表中的信息和铝元素的原子结构示意图．请回答下列问题 1硅原子的核外电子数是． 2铝离子的符号． 3铁在地壳中主要以铁矿石的形式存在其中赤铁矿的主要成分是Fe2O3．Fe2O3中铁元素的化合价为价．
A Ilikereading.1Iwas9yearsoldIcaughtabadcold.Ihadtostayathomeforseveralweeks.Mymotherboughtmesomenovels.SoonI2attractbythestories.SincethenIhavemadeuseofanytimetoread.NowIoftensurftheInternetathomewhereI'vefoundmanystudentslikereadingasIdo.Weexchangeourreadingexperienceandbecomeonlinefriends.3readbringsmebothhappinessandfriendship. B ChinesecommunitiesaroundtheworldwelcomedtheYearofthePig4February5th.CelebrationstookplaceacrossthegloberangingfromSoutheastAsia'scenturies﹣oldChinesecommunitiestothemorerecently5establishChinatowns.InthestreetsofseveralEuropean6cityperformancesofdragondancesandliondancesdrewhugecrowdsofpeople.CelebrationsinLondonareexpected7lastamonthwithseriesofactivities8isthebiggestChineseNewYearcelebrationoutsideAsia. C AccordingtothereportTian'anmenSquarewillenterthe5Gera时代.ThisalsomeanstheTian'anmenSquare9becomea5Gsmartsquareinthenearfuture.5Gnetworksnotonlyhavebettersignalsand10fastdownloadspeedsbutalsohaveafar﹣reachingimpactonlargetouristattractions.Inadditiontomeetingtheneedsofhigh﹣speedinternetaccess5Gnetworkcanalsosupport4KHDvideocallingsoastobringbetterexperiencesforthegeneralpublicandtourists.
MysteryofMosquitoFlight Themosquitoisatroublesomeanddangerousinsect.TheirbitesitchandcancarrydangerousdiseaseslikemalariaZikavirusandyellowfever.RecentlyresearchersfromBritainandJapandiscoveredhowmosquitoesfly.1 Mosquitowingsaresmallandhaveanuncommonshape.2Sohowistheirflightpossible?TheteamofscientistsfromBritainandJapansolvedthemystery.Theyusedhigh﹣speedcamerasandcomputerimagestounderstandthemechanicsofhowtheinsectmovesitswingstostayintheair. 3Theysetupeightsuper﹣highspeedcamerasthattake10000imageseachsecond.SimonWalkeraresearcherattheUniversityofOxfordexplainsthatnormallyatleasttwocamerasareneededtorecordaninsectsothey'vegotenoughviewsofaninsect.Withtwocameraviewstheycanthentakeanypointonaninsectandcalculateits3﹣Dcoordinates三维坐标. Mosquitoescanspreaddiseases.Theinsecthastwoantennaeortallthinorgansonitsheadthatitusestofeelthings.Butitsantennaeandsixlegsmakeitdifficulttotakeclearimagesofthewingmovements.4Theextracameraslettheresearchersseethatthemosquito'swingsmoveeighthundredtimeseachsecond.Thatisfourtimesfasterthanmanyinsectsofasimilarsize. Mosquitoesflybymovingtheirwingsinseveraldifferentdirections.Thethintopedgesoftheirwingsmoveforwardfirstandthentheychangedirectionandmovedown.Themovementlooksasifthewingsaredrawingthenumbereight.5Walkersaysthatexistingunmannedflyingdevicesdonotworkverywelloutsidebecausewindcanaffecttheirflight. Insectsontheotherhanddealreallywellwithevenquitewindyconditions.Sounderstandinghowtheycandothisisgoingtobeadvantageoustous.Theseresearcherssaythatunderstandinghowmosquitoesflymighthelpfindwaystostopthemfromspreadingdiseases. A.Becauseofthisitishardtobelievethattheyareabletofly. B.Mosquitoesevolvedfromotherinsectsabout226millionyearsago. C.Sotheteamneededtouseeightcamerastoviewthewingsfrommanydirections. D.ResearchersattheUniversityofOxfordtookimagesofmosquitowingmovements. E.Manymeasureshavebeentriedformosquitocontrolforexamplegettingridofbreedingplaces. F.Thisknowledgetheysayhelpfindwaystostopmosquitoesfromspreadingdiseasesinthefuture. G.Theresearchteambelievesthemosquitoes'wingmovementscouldhelpinventorsdesignnewflyingdevices.
假设你是红星中学高三1班学生李华.为迎接建国70周年上个月学校组织了祖国在我心中主题知识竞赛.请根据以下四幅图的先后顺序介绍你和同学们参加活动的完整过程并以ASignificantEvent为题给校刊英语角投稿.词数不少于60. ASignificantEvent
目前化石燃料是人类生产生活的主要能源．随着全球能源使用的增长化石燃料等不可再生能源将日趋枯竭．世界各国人民的节能意识正在日趋增强科学家也在开发新能源研制节能产品提高化学能的转化效率等方面做着积极的努力．下列是目前正在利用和正在开发的部分能源煤石油天然气太阳能风能潮汐能氢气“可燃冰”等．回答下列问题 1属于不可再生的能源是 2我国“西气东输”工程输送的能源物质是 3埋藏于海底目前开采在技术上还存在很大困难的能源物质是． 4通过非化学反应产生能量的能源是．
TwobirthdaysOnemistake ZackaryJohnsonhasabirthdaycomingupinafewdayssoitwasn'tsurprisingtohaveanenvelopeaddressedtohimlastweek. HismomGlenda1immediatelythatitwasspelledZacharyJohnson.Shedidn'tfindthatunusualbecausemanypeoplespellZackary'sname2.Butthesender'spre﹣printedlabelmadeherconfused.Thatnamedidn't3uptoanyoneofherfriendsorrelatives.SheaskedherhusbandDoyou4thisname?NopeSteverespondedandbecamesomewha5. Stilltheyagreedto6theenvelopetotheirsontoseewhatwasinit.Zackopeneditto7＄20inabirthdaycardthatsaidHappyBirthdayZachary!Hewas8andwasreadytogoshopping!! Howeverthe9increasedforGlenda.Thecardwasunsigned.Shewaswonderingwhya10wouldsendmoneytohersonand11hewouldknowitwasZack'sbirthday.Avarietyofscenescango12parents'mindsespeciallywhentheyhearstoriesaboutInternetcrimes.Theyknewtheywouldhavetomakesomeinquiriesnotonlytogivethem13butalsotoprotecttheirson. Iknowwhothatfellowis!HeisanoldfarmerthatlivesoutonHillberryRoad.Glenda'sdadsaidwhenhewasinformedofthe14. Sothecouplequicklydroveoutintothecountryandfoundthehouse.15noonewashome.Stevedecidedtoleaveabriefbut16messagethatthecallshouldbereturnedassoonaspossible. Thenextdaytheoldfarmercalled.Thefarmer'sgreatgrandsonZacharyJohnsonhadrecentlymovedwithhisparentstoHeavenlyDrive.That'sthestreetwhereZackaryJohnson17.Thefarmerwassuresurprisedbythe18ofevents.Hefiguredhe'dhavetosendanothercardtohisgrandson.ButZackaryJohnsonwhoisturningelevenyearsoldinafewdaysdidtherightthing.Heandhisparents19theirwaydownHeavenlyDrivetothehomeofZacharyJohnsonwhoisturningfouryearsoldinafewdays.They20Zachary'sgreatgrandfather'scardwiththe＄20.PlusZackaryJohnsonwishedZacharyJohnsonaveryHappyBirthday. 1A.expected B.guessed C.added D.noticed 2A.hesitantly B.incorrectly C.quickly D.naturally 3A.match B.back C.call D.build 4A.sign B.like C.bear D.recognize 5A.embarrassed B.discouraged C.concerned D.ashamed 6A.present B.return C.address D.drop 7A.hold B.find C.reach D.pay 8A.relieved B.relaxed C.amused D.excited 9A.unease B.anger C.regret D.sadness 10A.relative B.friend C.stranger D.farmer 11A.who B.what C.when D.how 12A.over B.beyond C.through D.against 13A.faith B.peace C.satisfaction D.confidence 14A.secret B.crime C.conclusion D.situation 15A.Amazingly B.Unfortunately C.Interestingly D.Undoubtedly 16A.urgent B.updated C.warning D.flexible 17A.walks B.travels C.lives D.moves 18A.turn B.order C.error D.trend 19A.changed B.made C.pushed D.cleared 20A.held B.showed C.delivered D.purchased
TheGreatBookSwap Hisixthgraders!MynameisTonyHill.IampresidentoftheWindsorHighSchoolStudentCouncil.Yourteacherletmecometoyourclasstodaytotellyouaboutareadingprojectthatwewanttodoandweneedyourhelp. Ifyou'relikemeyoulovetoreadbutsometimeshaveahardtimefindingbooksyouwanttoread.Itseemsasifthebestbooksatthelibraryarealwayscheckedout.Tohelpgetmorebooksintopeople'shandswe'replanningtheGreatCommunity社区BookSwap. Tomaketheprojectasuccessweneedeveryone'shelp.Askyourparentsifthereareanyunusedbookstakingupspace.Askyourfriendsandneighbourstodonateunwantedbooks.Maybeyouhavebooksyoulikedwhenyouwereyoungerbutdon'treadanymore.Bringthemtoschoolandmakeayoungreaderhappy.Weneedallkindsofbooksforallkindsofreaders! TherearemanytimesI'dliketogobuynewbooksbutIdon'thavealotofmoneytospendonthem.Wouldn'titbegreattoswapbooksrighthereinourcommunity?Volunteerswillorganizethedonatedbooks.Thenthebookswillbedisplayedatthecommunitycenter.Everyonewillbeabletoreadandhopefullyfindtheperfectbook.Studentswillbeallowedtochooseuptotwobooksduringeachdayoftheswap.OurplanistohavethebookswapthefirstSaturdayofeverymonth. Ifyoulikereadingjustcomeandlookthroughthecollectionofbooks.Eachgradewillhaveitsownweektobringinbooks.Rightnoweighthgradeisbringinginbooks.Wheneverygradehasbroughtinbookswewillhavequiteaselection.Youwillprobablyfindatleastonenewbookthatyou'dliketoread.Whoknows?Maybeyou'llfindabooksogoodthatyouwon'tbeabletoputitdown. Whatareyouwaitingfor?Gohomeandcleanoutyourbookshelvesandclosets! 1WhydidTonyHillcometotheclassofsixthgraders? A.Toexplainareadingproject. B.Tointroduceanewly﹣builtlibrary. C.Toaskthestudentstohelpdonatebooks. D.Togivethesixthgradersadviceonreading. 2WhatisParagraph4mainlyabout? A.Howthebookswapwillwork. B.Whenbookswillbebroughtin. C.Whatkindsofbooksareneeded. D.Whythebookswapisnecessary. 3Whatdoestheunderlinedsentenceinthelastparagraphindicate? A.Morebooksareneededinthefuture. B.Volunteersplayanimportantroleintheproject. C.Everyoneissuretobeabletofindthebookshewants. D.Studentshavealreadystartedhelpingwiththebookswap. 4WhichofthefollowingwordsbestdescribesTonyHill? A.Realistic. B.Persuasive. C.Independent. D.Ambitious.
TheAlexandertechnique UntilearlierthisyearIdidn'tknowanythingabouttheAlexandertechnique﹣andsawnoreasontothinkIshould.OnedaythebackacheIregularlysufferedwasmorepainful.Iwasbroughtuptothinkthatthepreferredwayofdealingwithachesistodonothingandhopethey'llgoawaybutIeventuallywenttothedoctor.AfterexaminingmehesaidYouactuallyhavebadposture姿势.GooffandlearntheAlexandertechnique.ThreemonthslaterIcouldwalkstraighterandsitbetter. TheAlexandertechniqueisawayoflearninghowyoucangetridofharmfultensioninyourbody.Theteachingfocusesontheneckheadandback.Ittrainsyoutouseyourbodylessseverelyandcarryoutthemovementsthatwedoallthetimewithlesseffort.ThereislittleeffortinthelessonsthemselveswhichsetsaparttheAlexandertechniquefromyogaorpilateswhichareexercise﹣based.Atypicallessoninvolvesstandinginfrontofachairandlearningtositandstandwithminimumeffort.Youspendsometimelyingonabenchwithyourkneesbenttostraightenthespine脊椎andrelaxyourbodywhiletheteachermovesyourarmsandlegstotrainyoutomovethemcorrectly. Thetechniquehelpstobreakthebadhabitsaccumulatedoveryears.Tryfoldingyourarmstheoppositewaytonormal.Thisisanexampleofahabitthebodyhasformedwhichcanbehardtobreak.Manyofuscarryourheadstoofarback.Theheadweighsfourtosixkilossoanyinappropriateposturecancauseproblemsforthebody.Thetechniqueteachesyoutoletgoofthemusclesholdingtheheadbackallowingittogobacktoitsnaturalplaceonthetopofourspines. SowhowasAlexanderandhowdidhecomeupwiththetechnique?FrederickAlexanderanAustralianactorbornin1869foundinhisyouththathehadvocal声音的problemsduringperformances.Heanalyzedhimselfandrealizedhisposturewasbad.Heworkedonimprovingitwithexcellentresults.HebroughthistechniquetoLondonandopenedateacher﹣trainingschoolwhichisstillsuccessfultoday. Soifyou'rewalkingalongtheroadonedaywithshouldersbentforwardfeelingweigheddownbyyourtroublesgiveathoughttotheAlexandertechnique.Itwillhelpyouwalktallagain. 1WhatdoestheauthorsuggestinParagraph1? A.Shefeltnobetterafterthetreatment. B.ShegotboredwiththeAlexandertechnique. C.Shewasscepticalaboutthedoctor'smethod. D.Shewasunwillingtoseektreatmentforherbackache. 2WhatistheprincipleoftheAlexandertechnique? A.Physicaltensionshouldn'tbecompletelyrelieved. B.Thetechniqueshouldn'tbecombinedwithotherexercises. C.Thepracticeofthetechniqueshouldn'tbeattemptedalone. D.Familiarphysicalactionsshouldn'tbedonewithmucheffort. 3WhatcanwelearnaboutFrederickAlexander? A.Hemanagedtorecoverhisvocalpowers. B.Hewaseagertomakeanameforhimself. C.Hedevelopedaformofexerciseforactors. D.Hehadtoleavehometodevelophistechnique. 4Whatisthemainideaofthepassage? A.Theoccurrenceofbackpainiswidespread. B.Alexanderimprovedthetechniquetotreatbodypain. C.TheAlexandertechniquehelpsovercomepostureproblems. D.Peoplewithbackpainarevictimsofinappropriatepostures.
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