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已知关于x，y二元一次方程组，且x，y满足x﹣2y＝0，则a的值为（ ）
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与已知二元一次方程5x-y=2组成的方程组有无数多个解的方程是
10x+2y=4
4x-y=7
20x-4y=3
15x-3y=6
若关于xy的二元一次方程组的解满足0≤x＋y
若关于xy的二元一次方程组的解也是二元一次方程x﹣2y=10的解则k的值为
2
﹣2
0.5
﹣0.5
已知关于xy的二元一次方程组的解满足x+y=0求实数m的值.
若关于xy的二元一次方程组的解满足x＋y＜2则a的取值范围为__________.
.若关于xy的二元一次方程组的解满足x+y＜2则a的取值范围为__________.
若关于xy的二元一次方程组的解满足x+y＞0则m的取值范围是.
若关于xy的二元一次方程组的解也是二元一次方程x﹣2y=10的解则k的值为
2
﹣2
0.5
﹣0.5
已知xy是二元一次方程组的解则代数式x2﹣4y2的值为
若关于xy的二元一次方程组的解也是二元一次方程2x+3y=6的解则k的值为________.
若关于xy的二元一次方程组的解也是二元一次方程2x+3y=6的解求k的值.
若关于xy的二元一次方程组的解满足x－y＞1则a的取值范围是
a>－1
a <2
a>1
a<4
如果关于xy的二元一次方程组那么关于xy的二元一次方程组的解是＿＿＿
若关于xy的二元一次方程组的解满足0≤x＋y
请写出一个以xy为未知数的二元一次方程组且同时满足下列两个条件:①由两个二元一次方程组成;②方程组的
已知关于xy的二元一次方程组且x+y=2则k的值为.
已知关于xy的二元一次方程组的解互为相反数求xya的值.
若关于xy的二元一次方程组的解也是二元一次方程2x+3y=6的解则k的值为___________
已知二元一次方程1x＋y＝422x－y＝23x－2y＝1.请从这三个方程中选择你喜欢的两个方程组成一
若关于xy的二元一次方程组中x的值是正数y的值是负数求m的取值范围
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InthepastwesternerswerenotfamiliarwithTraditionalChineseMedicineTCMbutnowitisbecominggloballypopular.AccordingtoagovernmentreportTCMhasbeenintroducedinto183countriesandregionsaroundtheworld. HoweverwesternersonlyhavealittleknowledgeofTCM.TheirunderstandingofTCMmaybelimitedtoacupuncture针灸cuppingandmassage按摩.Forinstancethepurpleinjury﹣likemarksleftonaU.S.famousswimmer'sbackfromcuppingtorelaxhismusclesandreducepainbecamethecenterofattentionduringtheRioOlympicsin2016. InfactChineseherbs药草playamoreimportantroleincuringdiseasesandkeepingthebodyingoodconditionintheTCMtreatmentsystemthanphysicaltreatment.Thereforeitisdisappointingtoknowthatalthough103worldHealthOrganizationmembercountrieshavegivenapprovaltothepracticeofacupuncturenotmanyrecognizeChineseherbalmedicine.TCMismuchlesspopularthanWesternmedicinepartlyduetotheslowdevelopmentofChineseherbs. Herbscanbemadeintopillspowderandsoup.Thekindofherbsusedtheirqualityquantityandtheprocessingtogetherdeterminetheeffectivenessoftheprescription处方.ComparedwithWesternmedicinewhichhasstandardizeddrugproductionprocessesandtreatmentmethodsTCMlacksstandardization.Thechemicalcompositionandfunctionsofitsmedicinearestillunclearandtheireffectsareunstable.FortunatelystandardizationhasimprovedinrecentdecadesandanumberoffactoriesareincreasinglyproducingpatentedTCMdrugs. AnotherreasonwhyTCMprescriptiondrugshavedevelopedslowlyisthatitlackscreativity.WhileWesternmedicine﹣makingcompaniescomeupwithnewproductseveryyearTCMdrugproducerstendtomakemedicineaccordingtoprescriptionshandeddownfromthepast.ThatChinesechemistTuYoyowonthe2015NobelPrizeinPhysiologyorMedicineforherresearchintomalaria痢疾treatmentmaydrivecreativitytosomeextentinChina'sTCMindustry. HoweverRomewasnotbuiltinaday.Thecurrentsituationcannotbechangedwithinashorttime. 1WhatdoestheexampleofanAmericanswimmerinParagraph2show? A.WesternersknowalittleaboutTCM. B.CuppingisakindofimportantTCMtreatment. C.Hewasinjuredinhisswimming. D.TCMisverypopularamongwesterners. 2Whydon'tsomemembercountriesofWHOrecognizeChineseherbalmedicine? A.Chineseherbscangetridofdiseases. B.Theyonlyapprovethepracticeofacupuncture. C.Westernmedicineismoreeffective. D.MedicinemadeoutofChineseherbsdevelopsslowly. 3HowdoesthewriterfeelaboutthefutureofTCM? A.Anxious. B.Negative. C.Optimistic. D.Disappointed. 4Whatisthebesttitleofthepassage? A.TheEffectivenessofTCM. B.TheBarrierstoTCM'sDevelopment. C.TheWeaknessofTCM. D.TheFutureofTCM.
小轩同学在“研究杠杆的平衡条件”的实验中他将杠杆挂在支架上结果发现杠杆左端向下倾斜． 1若要使杠杆在水平位置平衡需把杠杆右端的平衡螺母向移动选填“左”或“右” 2调杠杆在水平位置平衡后在杠杆上的A点挂三个重均为0.5N的钩码用调好的弹簧测力计竖直向上拉杠杆上的B点使杠杆保持水平平衡如图所示则弹簧测力计的拉力大小是N 3如果将测力计沿图中虚线方向拉仍使杠杆在水平位置平衡则弹簧测力计的示数将选填“变大”“变小”或“不变”．
如图所示的电路中电阻阻值R1＞R2．开关S闭合后电阻R1R2两端的电压分别为U1U2通过两个电阻的电流分别为I1I2．下列判断正确的是
ThreehundredyearsagothemaohouorhairymonkeysquicklybecamemuchlovedbythepeopleinBeijing.Howdidsomebodycomeupwiththem? Thestory1gothattheshopkeeperofaChinesemedicineshopwasoftenseenshoutingathisemployees.Oneeveninganapprenticewastidyinguptheingredients原料2usetomakeChinesemedicinesintheshop.Topassthetimehefound3hemakingalittlefigureoutofthefeatheryflowersandtheheadandlegsofacicada's蝉skin.Theapprenticeshowedittohiscolleagues4jokethatitlookedliketheirbad﹣temperedboss. Thelittlecreaturebecamesuch5hitthattheystartedmakingmorefigures.ThusBeijing'sunbelievablecraftofhairymonkeymaking6bear. Nowadayshairymonkeysarefar7themostpopularchildren'sgiftsonthemarketinBeijing.Mass﹣producedtoyshave8mostreduceddemandforhandmadefigures.Butthat'snottosaythatthemaohouhavecompletelydiedout.Walkamongthe9sellerandgiantteddybearstandsoftoday'stemplefairsinBeijing10youmightstillfindafewplacessellinghairymonkeys.Theyarewithoutdoubtoneofthecity'smostamazingcrafts.
如图所示是某同学在研究“滑动摩擦力大小与哪些因素有关”的实验装置示意图．下表是他测得的滑动摩擦力与钩码重力的数据．请根据表中的数据归纳出滑动摩擦力大小与钩码重力大小的关系式f＝．
GoodnewsforcoffeeandteadrinkersNomorewastingtimeandenergywaitingfortheperfectcup.UsingpatentedHeatworks'OhmicArrayTechnologytheDUOSmartUntetheredCarafe玻璃水瓶hasthepowertoheatorcoolwatertotheexactdegreewhileyoupour.WithitsfunctionalityconvenienceandstylishappearancetheDUOlookslikequitethegamechanger. Sohowdoesitwork?Theprecisetemperaturecontrolletsyoupickthewatertemperaturetotheplus/minusonedegree.Simplysetyourtemperaturepourwaterintothetankfitsfourcupsatthetopandpourintoyourcup.Thecarafefeaturesonebluespout出水口forfiltered过滤的coldwaterandanotherredspoutforhotwaterwhichappearstoheatupinstantly. Theentiredeviceisbatteryoperatedmakingitperfectfortakingittotheofficeorreallyanywhereelse.Youwillalsobeabletoplugitinsothecarafecanstaycomfortablyonyourkitchentableordesktochargeforon﹣the﹣gouse. TheDUOadvocate99percentenergyefficientlyandanadvancedwaterfiltrationsystemcreatedbyheatworksCEOJerryCallahanwhowantedtocreateaheatingsystemwithoutusingmetalheatingelements. Unsustainableandimperfectmetalheatingpartshavebeenusedforheatingforthepast100yearsandcarrytheriskofrusting生锈.CallahanfeltItwastimeforanupgradeheatingsystemsandtheOhmicArrayTechnologywasborn.Usingelectricalcurrentspassedthroughthewateritselfratherthanseparateheatedelementstotransferheatintothewater.OhmicArraycutsoutawholestepintheprocess. TheDUOisnotyetavailableforpurchasebutyoucanlearnmoreInformationandsignupforthereleaseupdatesontheHeatworkswebsite. 1WhatdoweknowabouttheDUOcarafefromthefirstparagraph? A.Itmakesperfectcoffee. B.Itheatsorcoolswater. C.Itproduceselectricitytoheatwater D.Itprovidesfungametoplay 2Whichstepisamusttogetwaterof80°CwiththeDUOCarafe? A.Settherequiredtemperature B.Cooltheboilingwater C.Pourwaterfromthebluespout D.Addfilteredwaterintothetank 3TheOhmicArrayTechnologymakestheDUOCarafe. A.fasttocharge B.convenienttotake C.toughandstylish D.rust﹣freeandtimeefficient 4What'sthemainpurposeofthetext? A.Toapplyforapatent B.Tointroduceaproduct C.Toreportaproductlaunch D.Toshareatechnology
Mostautonomousvehiclestest﹣drivingincitiesnavigate导航byusing3﹣Dmapsmarkingeveryedgeofroadsidewithalmostcentimeter﹣levelaccuracy.Butfewplaceshavebeenmappedinsuchdetailwhichhasleftmostareaslikesmallertownsinaccessibletothosedriverlesscars. ResearchersattheMassachusettsInstituteofTechnologyMITnowhavedevelopedanewnavigationsystemthatguidesautonomousvehicleswithoutsuchaccuratemaps.Thistechnologycanhelpdriverlesscarstravelalmostanywhere. Thenavigationsystemmapsoutacoursedownunfamiliarroadsmuchasahumandriverwouldbycontinuallyscanningitssurroundingswithalasersensor激光感应器tomeasurehowcloseitistotheedgesoftheroad.Meanwhilethecaralsofollowsatoollikeasmartphonemapappthatprovidesdirectionstoitsdestinationaswellasinformationabouttherulesoftheroadsuchasspeedlimitsandthepositionsofstoplights.TeddyOrtaroboticistatMITtest﹣droveacarequippedwiththisnavigationsystemonaone﹣wayroad.Itslowlytraveledonekilometerwithoutanyhumanassistance. Thissystemassumesthatacarhasaclearpathdowntheroadbutitcanbepairedwithotherexistingcomputingtechnologytodiscoverin﹣roadobstacles障碍saysOrt.Theresearchersalsoplantobuildaversionofthissystemwhichcanspotmarkingspaintedonstreetssothatthecarcandriveontwo﹣wayroads.Self﹣drivingcarswiththisnavigationsystemmayneedothersensorstoworkindifferentconditionsAlexanderWyglinskiandelectricalengineeratWorcesterPolytechnicInstitute.Sincelasersensorsdon'tworkwellinrainorsnowthesecarsmightneedadditionalimagingtechnologiestodrivesafelyinbadweather. 1Whatmaybeaproblemformostdriverlesscars? A.Theyfailintest﹣driving. B.Theirmapsareout﹣dated. C.Theyruninlimitedareas. D.Theirguidesareunreliable. 2WhatcanweinferabouttheMITnavigationsystem? A.Itincludesaccuratemaps. B.Itremovesin﹣roadobstacles. C.Itworksbydetectingtheroad. D.Itfeaturesasmartphoneapp. 3WhatisthepurposeofParagraph4? A.Toconfirmthetest﹣driveresults. B.Toindicatefurtherresearchareas. C.Torecognizescientists'achievements. D.Toshowthecreativityofdriverlesscars. 4Whatisthemainideaofthetext? A.Autonomouscarsbeathumandriversoncountryroads. B.Navigatingself﹣drivingcarsmayworkindifferentconditions. C.Smartmappingtechnologyaddstothefunctionsofself﹣drivingcars. D.Anewnavigationsystemhelpsautonomouscarsdriveremoteroads.
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假如你是李华想邀请外教John一起观看5月14日再厦门嘉庚剧院TanKahKeetheatre上演的中国民族歌剧经典选段ChineseOperaExcerpts音乐会.请给他写封邮件内容包括 1.音乐会时间地点 2.音乐会内容 注意1.词数100左右2.可以适当增加细节以使行文连贯.
LED灯发光的颜色与其两端的电压之间的关系如表所示小阳用一个阻值为150Ω的电阻与LED灯串联接在电压为6V的电源上恰能使LED灯发出蓝光．如图所示． 求1定值电阻R1两端的电压． 2通过定值电阻R1该电路的电流． 3LED灯的实际功率．
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. HiDavidmanythankforyoure﹣mailofMarch2.I'msogladlytolearnthatyouareleavingCalgaryforChinathissummervacationandcometomyschoolforavisit.Hereiswhatyoucangettomyschool.Afterwalkingouttheairportyoucangoalongtheroad.Andatthesecondcrossingpleaseturningleftandcrossthebridge.WalktoeastwarduntilyouseeGalaxyHotelnexttowhichliemyschoolGuangmingHighSchool.It'sonlyaboutfifteenminutes'walkfromanairporttomyschool.I'msureyou'llhavenotroublefindingthem.
为探究水蒸发快慢与哪些因素有关在四块相同的玻璃板上各滴一滴质量相同的水如图所示． 1通过两图的对比可以得出水蒸发快慢与水的温度有关． 2如果选择图AB进行探究实验所研究问题的自变量是． 3通过对比AD两次实验发现D图中的水滴先蒸发完．根据这一现象请你提出一个可探究的科学问题．
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ChinahasbeenselectedtohosttheWorldSkillsCompetitioninShanghaiin2021aneventithopestousforbuildingastrongerteamofskilledworkersnationwideandtoimproveinternational1exchangeintechnicalskills.Hostingtheeventwillhelpguidethewholesociety2respectthespiritofskilledworkmanship.Itwillalsohelpcreate3socialatmosphereofrespectinglaborandadmiringskill.Chinahas165millionskilledworkersincluding47.9millionwhoareclassedashighlyskilled.Theywerefirstclassifiedbythegovernmentin2003.They4includeasoneofthemajorSate﹣leveltalentgroupsalongwiththeoreticalscientistsin20155markasignificantriseintheirsocialstatus. China's6earlymodernskillstrainingcandatebacktotheQingDynasty.Itwasin18667theFoochowShipbuildingInstitutioninFujianprovincewasestablished.In1978theadoptionofthereformadopening﹣uppolicyhighlightedashortageof8talenttechnicians.Asaresultthenumberofstudentsattechnicalinstitutesrosesharply.Morerecentlytechnicaleducation9receivegreatersupportfromthecentralgovernmenttohelpshapethenation'sproducingpower.Everyyearmorethan100millionpeoplehaveaccess10technicaleducationandtraining.
CourseNo.140612Lectures30Minutes/Lecture InTheSecretsofMentalMathaward﹣winningProfessorArthurT.Benjaminteachesyouthebasicknowledgeofmentalmathematics.Thispowerfulabilitytoperformmentalcalculationswillgiveyouanedgeinbusinessatschoolatworkoranywhereelsethatyoumeetwithmath. CourseNo.717512Lectures30Minutes/Lecture InMuseumMasterpiecesTheLouvreexpertartcriticandhistorianProfessorRichardBrertelltakesyouonanunforgettablejourneythroughoneoftheworld'sgreatestmuseums.This12﹣lectureseriesexploressomeofthemostbeautifulandrenownedexamplesfromthemuseum'sremarkablecollectionofmasterworks. CourseNo.15812Lectures30Minutes/Lecture InMyFavoriteUniverseworld﹣famousphysicistanddirectoroftheHaydenPknetariumNeildcGrasscTysontakesyouonaspiritedandintellectuallyinterestingjourneythroughtheuniverseandallitshistoryfrombeforethebigbangtothemostlikelywaysinwhichtheentireuniversemightend. CourseNo.629912Lectures30Minutes/Lecture InTheHistoryoftheBibleTheMakingoftheNewTestamentCanonNewYorkTimesbest﹣sellingauthorandprofessorBartD.EhrmanrevealsthesecrethistorybehindthemakingoftheNewTestamentincludinghowandwheneachbookwaswrittenandwhyitwaschosentobeincluded. SPECIALINTRODUCTORYOFFER! Orderanyoneofthese BEST﹣SELLINGCOURSESforonly ﹩199.95﹩9.95onDVD ﹩134.95﹩6.95onCD +﹩5ShippingandHandling ORDERTODAY!SaleEndsFriday! 1Whocantellyousomethingaboutthespace? A.BartD.Ehrman. B.NeildcGrasscTyson. C.ArthurT.Benjamin. D.RichardBrertell. 2HowmuchisCourseNo.158onDVDdeliveredtoyourhouse? A.﹩6.95. B.﹩9.95. C.﹩11.95. D.﹩14.95. 3Whatisthepassagemainlyabout? A.Collegecoursesstudiedinhome. B.Collegecourseslearnedonline. C.Someworld﹣famouslectures. D.Fourinterestingbooksindiscount.
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Idon'tbelieveArtificialIntelligenceAIcouldreplacemyteachingcareer.IhavealwaysbeeninterestedinhumanconnectionandthewaysinwhichIcanusetheseconnectionstoinspirechangeandmakeadifference.1thereareotherwayswhereAIcouldmakeamoreefficientandeffectivedifferencethanIcouldonmyown. Myteachingexperiencesoverthepastseveralyearshavebeencreativeandinspiring.Ibelievethatthejobofeducatorsextendsbeyondsimplyteachingstudentsasetcurriculum.2theymustconstantlyreflectonwaystobettertheirteachingandtheymustinspiretheirstudentstobethebestversionsofthemselves.AndnowwiththehelpAItheycouldachievethesegoalsmucheasier. 3.FirstAIcanbeusedtopromotefundamentalskillssuchasmathematicaleducationandvocabularylessons.AdditionallyIseeAIbeingusedforsuchnecessarytasksasansweringquestionsandgradingassignments.ThusIcouldfocusmyattentiontoestablishinghumanconnectionindividualizinglessonplansandinspiringmystudents. 4.IbelieveAIcouldprovideastrongbasisforeducationalequalityaroundtheworld.AccordingtoToddLeopoldcloseto800millionpeopleworldwidearefunctionallyilliterate不识字的.Duetoitsabilitytoefficientlypassknowledgeacrosslargegroupsofpeoplefewerteachersmaybeneededinsomeschools5. A.Sincestudentswillalwaysneedahumanteacher B.ThebenefitAIbringsisfarbeyondmyownclassroom C.IthinkAIisapowerfulassistanttomyfutureclassroom D.TheneedforstudentstolearnhowtouseAIwillalsogrow E.AlthoughhumanconnectionmayneverbeabletobefullyreplacedbyAI F.Thiscouldbeanopportunityforstudentseverywheretoreceiveequaleducation G.Theymustobserveandgettoknowtheirstudentsinordertoindividualizeeducationalplans
对下列常见现象的解释正确的是
假设你是红星中学高三学生李华你的英国朋友Jim在给你的邮件中提到他暑假将来北京参加外国人唱中国歌大赛希望你为他推荐一首中文歌曲.请给他回邮件内容包括 1.推荐曲目 2.推荐理由 3.你的祝愿. 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
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Risingthroughstagestorealizeourselves Manymodernpeoplehavetheproblemthattheydon'tknowwhotheyareandwhattheirpurposeis1.Oncehighschoolseniorsgraduatetheyseemtolosetheiridentity.Theyoncestudiedhard.Butaftertheystopworkingtheybegintolosetheirway. InthetheoryoftheHierarchyofNeeds需求理论AbrahamAsloputforwardasimilarsituationwhichconsistsofthefivelevelsofaperson'sneed.Thefifthandfinallevelisself﹣realizationwhichiswhereourfinalachievementlies2. Ithinkself﹣realizationhasthreemajoraspects.Thefirststageisacceptancethesecondstageisdiscoveryandthelaststageisperseverance. Acceptanceisthefirststage.Weshouldberemindedthatweareallbornuniquesoweallhaveourownstrengthsandweaknesses.Onlywhenweunderstandthesecanwepursuethemorchangethem3. Oncewe'veacceptedourselveswecandiscoverwhatweareinterestedinandwhatwewanttobe4butindeedweshouldliveforourselves.SobeforewestartworkingtowardsapurposeweshouldaskourselvesIsthiswhatwetrulydesire?andIsthisgoingtochangethesituationwe'rein? Thelaststageisperseverance5.Thosewhocanself﹣realizearepeoplewhofocusonthethingstheywanttochange. Throughthethreestageswecouldgainrecognitionofourselves.Andbythispointwhateverthethingstheywanttoourliveswerelikewewouldbeabletostandtallconfidentofourselves. A.It'snothingtoamanofperseverance. B.Onlybyacceptanceofthepastcanwechangeit C.Thisisespeciallycommonamongcollegestudents D.Manypeopletendtogoalongwithsocialexpectation E.Beingobjectiveandyettolerantisthekeytoacceptance F.Itistheprocessofknowingourselvesandfindingapurpose G.Exploringourpotentialisn'tgoingtobedoneinashorttime
Encouragingchildrentousegesturesastheythinkcanhelpthemcomeupwithmorecreativeideasaccordingtonewresearch. OurfindingsshowthatchildrennaturallygesturewhentheythinkofunusualwaystouseeverydayitemssayspsychologicalscientistElizabethKirk.Whenwethenaskedchildrentomovetheirhandstheywereabletocomeupwithevenmorecreativeideas. Gesturingmayallowustoexploretheproperties特性oftheitems﹣forexamplehowtheitemcouldbehelditssizeitsshapeetc.﹣anddoingsocanhelpuscomeupwithideasforcreativeusesKirkexplains. Intheirfirststudy?theresearcherscomparedthecreativityofchildrenwhospontancously自发地gesturedwiththosewhoeitherdidnotorcouldnotgesture. Atotalof78childrenaged9﹣11sawaseriesofimagesofordinaryitemssuchasanewspaperatincanandakettle.Theresearchersaskedthechildrentolookateachimageandlistasmanyusesastheycouldthinkof.Agroupofparticipantscompletedthetasktwice﹣ononeversionofthetasktheyworemittens连指手套thatlimitedtheirabilitytogesture. Restrictingchildren'sabilitytogesturedidnotaffecttheirabilitytocomeupwithcreativeusesfortheobjectsChildrenwhowerefreetogestureproducedaboutthesamenumberofideasasthosewhoworethemittensandcouldnotgesture. Inasecondexperiment54childrencompletedthesamealternative﹣usestask.Insomecaseschildrengesturednormallyinothercasestheresearchersencouragedthechildrentouseyourhandstoshowmehowyoucouldusetheobjectindifferentways. TheencouragementworkedChildrenwhowerespecificallyencouragedtogestureproducedagreaternumberofcreativeusesfortheobjectsthandidthechildrenwhowerenotgivenanyspecialinstruction. OurfindingsaddtothegrowingbodyofevidenceshowingthesignificantroleofgestureinthinkingandhaveapplicationstotheclassroomKirkconcludedintheirpaper. 1Whatdidtheresearchersintendtofindoutinthefirstexperiment? A.Thenumberofcreativeideasthechildrencouldthinkof. B.Howthechildrenwouldexplorethepropertiesoftheitems. C.Whetherencouraginggesturewouldhelptoproducemorenewideas. D.Thedifferencebetweenthinkingwithgesturesandwithoutgestures. 2Whyweremittensusedintheexperiment? A.Torestrictgestures. B.Tolimitcreativethinking. C.Totesttheabilitytogesture D.Toincreasecreativeideas. 3Whendidthechildrenthinkofthemostnewideas? A.Whenwearingmittens. B.Whenencouragedtogesture. C.Whennaturallygesturing. D.Whennotusingtheirhands. 4Whatwouldbethebesttitleforthetext? A.CommunicatewithGestures B.ThinkwithYourHands C.UseEverydayItemsCreatively D.MakeGestureswhenNecessary
关于安全用电常识下列说法正确的是
小贝利用铝块细线量筒和适量的水测量一个形状不规则的小蜡块的密度．如图所示的四个图是小京正确测量过程的示意图图中V0V1V2V3分别是量筒中面所对应的示数．已知水的密度为ρ水则下列四个表达式中正确的是
水与我们的生活息息相关如图所示为水的物理量间的关系图线其中正确的是
如图所示的四件展品展现了我国古代劳动人民的智慧成果对其中所涉及的物理知识下列说法中正确的是
WearrivedinSpainforthefirsttimeafewweeksago.Idecidedto1acarbecausewehadsoldtheonewehadinEnglandbefore2home.Yesterdaythesalesofficerangustosaythecarwas3.IhadtriedoutamodellikeitbeforebutasIwasnotyet4drivinginthiscitymywifedidnotwantmetocollectit5sowewenttogetherto6it.Wepaidforthecarand7thepapers.Theytoldusthattherewas8petroltotakeustoagaragewherewecouldfillup.The9garagetotheofficewasabout100yardsawayandwegotthere10.ButwhenIturnedintothemainroadIsuddenlysawalotofcarsracing11me.Igotoutof12asfastasIcouldbybackingintothegarage13andthemanbehind14me. It'ssuchaproblemto15todriveontherightsideisn'tit?mywifesaid.YesifonlyIhadhadafewlessonsfor16Ireplied.Youhadbettergo17onthewayhomemywifesaid.You'dbesorryifyouhad18onthefirstdaywouldn'tyou?WhileweweretalkingthemanbehindgotoutofhiscarandsaidingoodEnglishWouldyoumindtellingme19youarethinkingofleaving?20areyougoingtositinyourcarallday? 1A.borrow B.drive C.buy D.choose 2A.leaving B.making C.returning D.getting 3A.right B.ready C.fixed D.sold 4A.sureof B.satisfiedwith C.interestedin D.usedto 5A.onmyown B.rightaway C.inahurry D.ontheway 6A.receive B.bring C.order D.fetch 7A.accepted B.wrote C.signed D.copied 8A.little B.enough C.much D.no 9A.best B.nearest C.quickest D.cleanest 10A.lately B.directly C.safely D.slowly 11A.after B.with C.around D.towards 12A.theirway B.thegarage C.theirsight D.thecar 13A.atlast B.oncemore C.asusual D.aswell 14A.caught B.cheered C.shoutedat D.chattedwith 15A.prepare B.continue C.choose D.remember 16A.discussion B.adventure C.experiment D.practice 17A.carefully B.smoothly C.quickly D.differently 18A.anerror B.aproblem C.anaccident D.aheadache 19A.when B.why C.how D.what 20A.For B.Or C.But D.So
如图所示在我国各个地区不同的发电站中属于利用不可再生能源发电的是
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