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问题提出： （1）如图①，边长为4的正方形ABCD对角线交点为O，另一个边长为4的正方形OEFG绕着点O旋转一周，设这两个正方形的重叠部分的面积为S，易证S为定值，则定值S为 ； 问题探究：...
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如右下图四边形ABCD是边长为1的正方形以对角线AC为边作第二个正方形ACEF再以对角线AE为边作第
如图设四边形ABCD是边长为1的正方形以对角线AC为边作第二个正方形ACEF再以对角线AE为边作第三
设四边形ABCD是边长为1的正方形以对角线AC为边作第二个正方形ACEF再以对角线AE为边作第三个正
如图14以边长为1的正方形ABCD的对角线AC为边作第二个正方形ACEF再以对角线AE为边作第三个正
如图正方形ABCD的边长为1以对角线AC为边作第二个正方形再以对角线AE为边作第三个正方形AEGH如
如图正方形ABCD的边长为4若把对角线AC平均分成n段以每一段为对角线作正方形设这几个小正方形的周长
如图以边长为1的正方形ABCD的边AB为对角线作第二个正方形AEBO1再以BE为对角线作第三个正方形
若正方形的边长为a则其对角线长为______若正方形ACEF的边是正方形ABCD的对角线则正方形AC
如图正方形ABCD中
B.＝1，点P.是对角线AC上一点，分别以AP、PC为对角线作正方形，则两个小正方形的周长的和是（ ）
A.1
2
4
8
如图正方形ABCD的边长为1以对角线AC为边作第二个正方形再以对角线AE为边作第三个正方形AEGH如
如图以边长为1的正方形ABCD的对角线AC为边作第二个正方形ACEF再以对角线AE为边作第三个正方形
设四边形ABCD是边长为1的正方形以对角线AC为边作第二个正方形ACEF再以对角线AE为边作第三个正
如图所示正方形ABCD的边长是2以正方形ABCD的边AB为边在正方形内作等边三角形ABEP.为对角线
如图正方形ABCD中AB=1点P是对角线AC上的一点分别以APPC为对角线作正方形则两个小正方形的周
如图正方形ABCD的边长为1以对角线AC为边作第二个正方形再以对角线AE为边作第三个正方形AEGH如
如图正方形ABCD的边长为1以对角线AC为边作第二个正方形再以对角线AE为边作第三个正方形AEGH如
如图14以边长为1的正方形ABCD的对角线AC为边作第二个正方形ACEF再以对角线AE为边作第三个正
如图正方形ABCD中对角线交于O.点正方形OMNQ与正方形ABCD的边长均为aDE=CF则两个正方形
如图正方形ABCD的边长为1以对角线AC为边作第二个正方形再以对角线AE为边作第三个正方形AEGH如
如上图设四边形ABCD是边长为1的正方形以对角线AC为边作第二个正方形ACEF再以对角线AE为边作笫
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一次函数y＝2x﹣5的图象与x轴的交点坐标为
Ilovedeverythingaboutschoolexceptforoneperson:Mildred.Everydayaswewalkedhomeafter1shewouldsteponthebacksofmyshoes.ThenwhenIstoppedtoadjustmyshoesMildredwouldsuddenlyslap拍myback.She2me.Soonmymotherfiguredthatsomethingwas3.Itoldherthewholestory.Mymomtoldmenottoworryandsaidshehada4.Thenextdaymymomwalkedupthehill5me.JustaswegottothetopofthehillwesawMildred.'HelloMildred.'Mymomsaidquietly.Mildredstoppedstanding6likeastatue雕塑.Herhandsandfacewerebright7.Heroversizedcoathungopen.Therewereonlytwobuttonsonit.Mymotherdidn'tsayanythingatfirst.Insteadshe8upMildred'scoatandturnedthecollaruparoundherneck.'I'mMarion'smother.Ineedyour9Mildred.'Mymother'shandsheldMildred'sasshe10.'Mariondoesn'thaveanybrothersorsisters.Sheneedsabestfriendatschoolsomeonetowalkupthehillwithherafterschool.WouldyoubeMarion'sfriendMildred?'Mildred11.'Ohthankyou!'Mymothersaid'IjustknowyouaresomeoneIcan12.'Thenshehuggedusandleft13nothingunusualhadhappened.MildredandIwalkedontoschool.AsIlookedoveratherIsawMildred14!I'dneverfoundhersohappybefore.Wewalkedupthehilleachdayafterschooltogetherandprettysoonwebecamebestfriends.Ididn'tunderstandmymom'splanatthetime.ButfinallyIcametounderstandhermessage:15neverfails.1A.lunch B.tests C.school D.sight2A.scared B.advised C.preferred D.taught3A.simple B.better C.surprising D.wrong4A.favor B.plan C.friend D.trouble5A.for B.as C.with D.before6A.fast B.deep C.hard D.still7A.red B.blue C.cold D.sad8A.made B.took C.buttoned D.looked9A.advice B.help C.sympathy D.delight10A.cried B.walked C.spoke D.argued11A.refused B.missed C.left D.nodded12A.dependon B.learnfrom C.turnup D.referto13A.evenif B.asif C.because D.when14A.eating B.crying C.speaking D.smiling15A.Pride B.Love C.Happiness D.Confidence
如图两根竹竿AB和AD斜靠在墙CE上量得∠BAC＝60°∠DAC＝70°则竹竿AB与AD的长度之比为
如图在菱形ABCD中点E在边AD上BE⊥AD∠BCE＝30°若AE＝2则边BC的长为
Everybodyistalkingaboutthebridge.Imeantheworld'slongestsea﹣crossingbridge.AnditiswidelyreportedbyABCNewYorkTimesandalsoWikipedia.Bythewaywhat'sthenameofit?It'sHongKong﹣Zhuhai﹣MacaoBridgeHZMB. ThoughHZMBtookover9yearstoconstructthe55﹣kilometer﹣longbridgehasaservicelifeof120years.Itconsistsofthe12kmHongKongLinkRoad.29.6kmMainBridgeand134kmZhuhaiLinkRoad.Italsoincludestheworld'sdeepestunderwaterpartatalengthof6.7kmwhichconnectstwoman﹣madeislands. TheHZMBconstructionenvironmentiscomplicated.Frequenttyphoonsairportheightlimitationhighenvironmentalstandardsetcshouldbetakenintoconsideration.Thatiswhythisbridgegetstheworld'sattention.HoweverthebridgeandtunnelsystemacrosstheLingdingyangwatersofthePearlRiverEstuarywillcutthetravelingtimebetweenHongKongandZhuhaiorMacaofromthreehourstoabout30minutes.Mostpeoplewilltakeabustomakethejourney.Thebuseswillcost8to10dollarsforasingletrip. Afterthebridgeopensthetravelingcostsfortakingadetourthroughthelandroutescanbeavoided.Thereforethebridgewillhelptomakeuseofthedistributionofindustriesraisethecompetetivenesstheregionandbenefitlogistics物流andtourism.TheprojectisbelievedtolayagoodfoundationforthedevelopmentoftheGuangdong﹣HongKong﹣MacaoGreaterBayAreawhichisconsideredanewhighlightinChina'seconomy. 1Whyhasthebridgedrawnsomuchattention? A.BecauseitsthelongestbridgeinChina. B.Becauseitsbeeninservicefor120years. C.Becauseitsconstructionisextremelydifficult. D.Becauseitconnectsthreeman﹣madeislands. 2Howdoesthebridgehelppeopleaccordingtothetext? A.Bycontrollinglocalindustry. B.Byattractingtouristsoverseas. C.Byofferingacleanerenvironment. D.Byreducingtravelingtimeandcosts. 3Whatcanbeasuitabletitleforthetext? A.AGreenBridge B.ATourThroughHZMB C.TheMainBridgeofHZMB D.TheLongestSea﹣crossingBridge
加拉帕戈斯群岛被誉为生物进化的“活的博物馆”群岛有原生鸟类50多种还有巨型乌龟蜥蜴鸬鹚燕尾鸥等当地特有物种下列叙述符合现代生物进化论理论的是
AwomanwhohadspenttheafternoonatTom'sbarcouldn'tfindherwallet.Shedidn'tcareaboutherIDcreditcardorcashbutherwedding1. Tomdidn'tliketheideathatan2couldhaveoccurredathisplace.Sohespenthoursoncameras3thewoman'severystepinthebar4shewenttositonabenchoutsideandleft.Soonayoungman5thebenchputsomethingintohispocketandwalkedoff.Tom6aphotoonlinehopingsomeonecouldknowhim. Withinhours.Tomgotatextfrom17﹣year﹣oldDannywho7havingtakenthewalletbecausehehadn'teatenintwodays.Hethoughttheringwas8sohetookthemoneyand9thewalletoffthepublicdocks码头intotheocean.Dannywasn't10withhisfamilyandhadbeenlivinginthe11foraweek.Tomafatheroftwosawtheboyforwhathewas:moreofakidthanacriminal12tohelphim. Tomcalledintwodiversto13thewallet.Anhourpassedbuttherewasno14oftheringatall. Tomgrew15.Eachpassingminuteincreasedthe16thatDannywouldbearrested逮捕. Thenadiverpoppedup.Inhishandwasthe17andinsidewasthering.Tomcalledthewallet'sowner.Sheimmediatelydroppedthe18againstDannyforstealingthering. Butitwasn't19forTom.He'dbeentroubledaboutDannysleepinginthecoldwoods.WithhishomebigenoughtogiveDannyaplacetoliveforawhileTomtoldtheteenhecould20withhisfamilyuntiltheboygotonhisfeetagain. 1A.video B.cards C.ring D.photos 2A.case B.theft C.incident D.affair 3A.watching B.following C.designing D.imagining 4A.because B.since C.until D.when 5A.touched B.noticed C.found D.approached 6A.published B.posted C.took D.developed 7A.admitted B.forgot C.denied D.risked 8A.genuine B.priceless C.expensive D.worthless 9A.pushed B.dragged C.threw D.put 10A.breakingup B.gettingalong C.puttingup D.walkingalong 11A.woods B.bar C.docks D.street 12A.managed B.failed C.decided D.happened 13A.searchfor B.reachfor C.returnfor D.preparefor 14A.signal B.sign C.symbol D.sight 15A.annoyed B.confused C.frightened D.worried 16A.speed B.awareness C.chances D.level 17A.wallet B.camera C.cash D.creditcard 18A.project B.charge C.campaign D.debate 19A.easy B.hard C.right D.over 20A.wander B.move C.travel D.stay
假如你是高中生李越你的美国笔友David热爱中国传统文化最近打算来中国工作生活一段时间但是不确定应该去往哪个城市写信向你咨询.请你给他写一封回信内容包括: 1.你推荐的城市; 2.推荐的理由不少于两条; 3.美好祝愿. 注意: 1.词数80左右; 2.可以适当增加细节以使行文连贯.
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HomestayprovidesEnglishlanguagestudentswiththeopportunitytospeakEnglishoutsidetheclassroomandtheexperienceofbeingpartofaBritishhome. WhattoExpect Thehostwillprovideaccommodation住处andmeals.Roomswillbecleanedandbedcoverschangedatleastonceaweek.Youwillbegiventhehousekeyandthehostistheretoofferhelpandadviceandtotakeaninterestinyourphysicalandmentalhealth. AccommodationZones HomestaysarelocatedinLondonmainlyinZones23and4ofthetransportsystem.MosthostsdonotliveinthetowncentreasmuchofcentralLondoniscommercialandnotresidential居住的.Zones3and4oftenofferlargeraccommodationinalesscrowdedarea.ItisveryconvenienttotravelinLondonbyunderground. MealPlansAvailable ◇ContinentalBreakfast ◇BreakfastandDinner ◇BreakfastPackedLunchandDinner It'simportanttonotethatfewEnglishfamiliesstillprovideatraditionalcookedbreakfast.YouraccommodationincludesContinentalBreakfastwhichnormallyconsistsoffruitjuicecereal谷物类食品breadandteaorcoffee.CheesefruitandcoldmeatarenotnormallypartofaContinentalBreakfastinEngland.Dinnersusuallyconsistofmeatorfishwithvegetablesfollowedbydessertfruitandcoffee. Friends Ifyouwishtoinviteafriendovertovisityoumustfirstaskyourhost'spermission.Youhavenorighttoentertainfriendsinafamilyhomeassomefamiliesfeelitisaninvasion侵犯oftheirprivacy. Self•CateringAccommodationinPrivateHomes Accommodationonaroom•onlybasisincludessharedkitchenandbathroomfacilitiesandoftenamainlivingroom.Thiskindofaccommodationoffersanindependentlifestyleandismoresuitableforthelong•staystudent.HoweveritdoesnotprovidethesamefamilyatmosphereasanordinaryhomestayandmaynotbenefitthosewhoneedtopractiseEnglishathomequiteasmuch. 1Thepassageisprobablywrittenfor. A.hostswillingtoreceiveforeignstudents B.foreignershopingtobuildBritishculture C.travellersplanningtovisitfamiliesinLondon D.EnglishlearnersapplyingtoliveinEnglishhomes 2Accordingtothepassagewecanknowthat. A.thehostwillprovidemedicalcare B.Zone4ismorecrowdedthanZone2 C.ContinentalBreakfastincludesbreadandfruitjuice D.youcaninvitefriendstovisitwithoutthehost'spermission 3Whydosomepeoplechooseself•cateringaccommodation? A.Toenjoymuchmorefreedom. B.Toentertainfriendsastheylike. C.ToenrichtheirknowledgeofEnglish. D.Toexperienceawarmerfamilyatmosphere.
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Whenathunderstormcomeslightningstrikescanbeadangerousthreat.Powerfullightningstrikescanhittreesbodiesofwatervehiclesandevenbuildings.Lightningcancausepowercutdamagetostructuresandpossiblyseriousinjury.1especiallyconsideringthatweoftencompareunlikelyeventstobeingstruckbylightning.Itdoeshappen.Herearesomeimportanttips. Haveaweatherwarningradio.Themostimportanttoolyoucanhaveisaweatherwarningradio.2andcontinueprovidinginformationaboutthestorm'sthreatwhichcanincludedangerouslightningstrikes. Findshelter.Duringbadweatherthemostimportantthingtorememberistofindshelter.Strongbuildingssuchashomesandbusinessesprovidethemostprotection.3. Ifoutdoorsfindcover.Ifyouareoutdoorsandunabletofindshelterindoorstakecoverinavehicle.Thecar'smetalstructurewillprotectyoufromalightningstrike.4youcandoafewthingsthatmayloweryourriskofgettinghitbylightning.Treestallobjectsandmetalstructuresaremostlikelytobehitsodon'tplanonusingthoseforshelter. Stayawayfromwindowsandconductors导体.Lightningcancauseseriousinjurytoyouoryourfamilynomatterwhereyouareeveninyourownhome.5.Becausewaterandmetalconductelectricityavoidusingwaterliketakingashower. A.Aradiowilltellyouwhenastormisapproaching B.Incaseyouaretoofarawayfromanyshelterorvehicle C.Howeverduringanemergencyanyshelterisbetterthannone D.Sounderstandinglightningrisksisanimportantpartofthunderstormsafety E.Keepawayfromwindowsanddoorswhichcanalsobeeasilybrokenduringaheavystorm
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高一下学期数学
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