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某正多边形的边心距为，半径为4，则该正多边形的面积为 ．
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已知正多边形的一个外角等于60°则该正多边形的边数为
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如果只用一种正多边形作平面镶嵌而且在每一个正多边形的每一个顶点周围都有6个正多边形则该正多边形的边
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一个正多边形的每个外角为60°那么这个正多边形的内角和是
正多边形的一个内角的度数为108°则这个正多边形的边数为
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下列命题中是假命题的是
各边相等的圆内接多边形是正多边形
正多边形的任意两个角的平分线如果相交，则交点为正多边形的中心
正多边形的任意两条边的中垂线如果相交，则交点是正多边形的中心
一个外角小于一个内角的正多边形一定是正五边形
如果只用一种正多边形做平面密铺而且在每一个正多边形的每一个顶点周围都有6个正多边形则该正多边形的每个
在四个命题各边相等的圆内接多边形是正多边形各边相等的圆外切多边形是正多边形各角相等的圆内接多边形是
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正多边形的一个外角的度数为72°则这个正多边形的边数为
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只用一种大小完全相同的正多边形地砖铺地时判断能否作平面镶嵌无缝不重叠的依据是
正多边形的材料
正多边形的边长
正多边形的对角线长
正多边形的内角度数
在AutoCAD绘制POLYGON正多边形时下列方式是错误的
内接正多边形
外切正多边形
确定边长方式
确定圆心、正多边形点的方式
下列说法①各角相等的多边形是正多边形②各边相等的多边形是正多边形③各角相等的圆内接多边形是正多边形
1个
2个
3个
4个
如果只用一种正多边形铺满地面而且在每一个正多边形的每一个顶点周围都有6个正多边形则该正多边形的每个内
若正多边形的内角和是1080°则该正多边形的边数是
若一个正多边形的一个外角为40°则这个正多边形是______边形.
下列说法正确的是
各边相等的多边形是正多边形
各角相等的多边形是正多边形
各边相等的圆内接多边形是正多边形
各角相等的圆内接多边形是正多边形
下列说法正确的是
每条边相等的多边形是正多边形
每个内角相等的多边形是正多边形
每条边相等且每个内角相等的多边形是正多边形
以上说法都对
对于一个正多边形下列四个命题中错误的是
正多边形是轴对称图形，每条边的垂直平分线是它的对称轴
正多边形是中心对称图形，正多边形的中心是它的对称中心
正多边形每一个外角都等于正多边形的中心角
正多边形每一个内角都与正多边形的中心角互补
如果只用一种正多边形作平面镶嵌而且在每一个正多边形的每一个顶点周围都有4个正多边形则该正多边形的边
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若正多边形的一个外角为40°则这个正多边形是______边形.
下列命题中正确的说法有填序号.①正多边形的各边相等②各边相等的多边形是正多边形③正多边形的各角相等④
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6分 HighSchoolCourseRequirementsforCollegeAdmissions Whileadmissionsstandardsvarygreatlyfromoneschooltoanothernearlyallcollegesanduniversitieswillbelookingtoseethatapplicantshavecompletedastandardcore核心curriculum.Asyouchooseclassesinhighschoolthesecorecoursesshouldalwaysbethemostimportant.StudentswithouttheseclassesmaybeautomaticallydisqualifiedforadmissionIngeneralatypicalhighschoolcorecurriculumlookssomethinglikethis English:4years ForeignLanguage:2to3years Math:3years Science:2to3yearsincludinglabscience SocialStudiesandHistory:2to3yearsArt:1year Keepinmindthattherequiredcoursesforadmissiondifferfromtherecommendedcourses.Atselectivecollegesanduniversitiesadditionalyearsofmathscienceandlanguagewillbenecessaryforyoutobeacompetitiveapplicant. WhencollegescalculateyourGradePointAverageGPAforadmissionspurposestheywilloftenignoretheGPAonyourtranscript成绩单andfocusonlyonyourgradesinthesecoresubjectareas.Gradesforphysicaleducationmusicperformanceandothernon﹣corecoursesarenotasusefulforpredictingyourlevelofcollegereadinessasthesecorecourses.Thisdoesn'tmeanthatelectivesaren'timportant.Collegesdowanttoseethatyouhavealargevarietyofinterestsandexperiencesbuttheysimplydon'tprovideagoodwindowintoanapplicant'sabilitytohandlestrictcollegecourses. Corecourserequirementsvaryfromstatetostateandmanyofthemoreselectivecollegeswillwanttoseeastronghighschoolacademicrecordthatgoeswellbeyondthecore.AdvancedPlacementIBandHonorscoursesareamusttobecompetitiveatthemostselectivecolleges.Inmostcasesthestrongestapplicantstohighlyselectivecollegeswillhavefouryearsofmathincludingcalculusfouryearsofscienceandfouryearsofaforeignlanguage. 1Howmanycoursesareincludedinatypicalhighschoolcorecurriculum? A.Three B.Six C.Eight D.Ten 2Whatdoesyournon﹣corecoursesmeanwhenyouapplytocollege? A.Yourintelligencelevel B.Youracademicstandard C.Yourtalentsandcreativity. D.Yourinterestsandexperiences 3Whowillmostprobablybeinterestedinthetext? A.Highschoolstudents B.Highschoolteachers C.Collegestudents D.CollegeteachersB
6月5日是世界环境如我国今年的主题为“绿水青山就是金山银山”下列做法不符合这一主题的是
7.5分Deardaughters MostparentstelltheirchildrenYoucanbeanythingyouwantwhenyougrowup.IfeelthesameandIsaythisoften.ButIalsowantyoutounderstandthatrealizingyourdreamscomesfromhardworksomegoodluckandgoodtiming. Herearesomewordsofwisdomforyouasyoumakeyourwayintheworldfromanentrepreneur企业家andfromyourmama. 1.Beopen﹣mindedtochangingyourpathalongtheway InhighschoolIwantedtobeapolitician.IleftmyhometownandwentofftocollegeinWashingtonDC.ThereIdiscoveredthatIlovedtosupportwomen.IttaughtmethatI'mcreativeastrongleaderandgreatatmarketing.AsaresultImovedontobetheheadofanationalhealthcarenonprofit.Becomingamotherwhileinthatjobopenedmymindtolaunchingabreastpumpbag储奶袋business.NowIrunahighlysuccessfulcompanythatIstarteduponmyown.I'mnotapolitician! 2.Failureiscriticaltoyoursuccess Failurecanbeheartbreaking.ButIwilltellyouthateveryfailureI'vehadalongthewayhasabsolutelymademebetter. Failingthebigmathexaminhighschoolandgoingtosummerschoolwasembarrassing.IeventuallypassedandI'veneverfailedanexamagain.Ilearnedfromthatexperiencetoaskforhelp.NowIaskforhelpinbusinessallthetime. I'mproudtobearolemodeltoyouasamomandanentrepreneur.IhopeIinspireyoutobelievethatyoucanbeanythingyouwant.Itwillbemypleasuretowatchyourlivesunfoldbeforemyeyes. Love Yourmom 1Inthewriter'sopinionwhatdoesittaketorealizeone'sdream? A.Failurehardworkandgoodtiming. B.Anopenmindfailureandhardwork. C.Hardworkgoodluckandgoodtiming. D.Agooddreamanopenmindandhardwork. 2Whatdidthewriterlearnfromherfailure? A.Failurecanmakeusembarrassed. B.Weshouldn'tgetangrywhenwefail. C.Don'tcaretoomuchaboutyourfailure. D.It'simportanttoturntoothersforhelp. 3Whichofthefollowingwordsbestdescribethewriter? A.Politicalandproud. B.Caringandcautious. C.Modestandunlucky. D.Flexibleandsuccessful.
1分Everyweekendthestudentsareowithalotofhomework.
8分InthepastdecadeIhaveoccasionallybumpedintostudentswhoseattentionislimitedtoatelephonescreen.Ineverusedaso﹣calledsmartphoneuntilmyoldcellphonebecamewornandIhavebeencuriousaboutwhatpeoplefindsoappealingtothem. InoneofmyclasseslasttermIofferedanexperimentaloptioninplaceoftheusualresearchpaper.StudentscouldkeeparecordofaweekwithonphonesnoFacebooknoSnapchatnosocialmediaatall.Thestudentsmostlyhadgrownupwithsmartphones.Manyexpressedfearoflivingforatimewithoutone.Itwasablackholethelastmealbeforetheelectricchair. ForthefirstdayortwoalmosteveryonesaidthatbeingwithoutsocialmediawasboringespeciallystandinginlineatStarbucks.Nexttoboredomwaslonelinessandanxiety.Disconnectingfromtechnologyfeltlikedisconnectingfromlife.Iwasleftout.saidonestudent. Aroundthreeorfourdaysmanynoticedchangesintheirbehaviors.Sleepandenergylevelsimproved.Severalwenttothegymmoreoften.Ihadanoceanoftimetoplayin.Socialrelationschangedenormously.Ihaddinnerwithfriendsandwetalked.Ireadabookmyparentsgavemeinhighschool.OnceIstartedIcouldn'tstop.OnespoketoaneighborinclassImadearealfriend.Ihadn'tdonethatsinceprimaryschool.Manydiscoverednature.IactuallystoppedtoadmirethescenerybutquicklymovedonbecauseIwasworriedthatpeoplewouldseemestaringatatreewhichisabitstrange.Severalweresurprisedatthewildlifeoncampus.IhadalwaysknowntherewererabbitsbirdsandsquirrelsbutIneverrealizedhowmanytherewere.IwonderedwhatelseImighthavemissed. Studentswhotookpartintheexperimentdiscoveredaworldbeyondwhatonecalledtherealbutnotrealworldoftechnology.TheywerelikelyassurprisedatwhattheyfoundasIwas. 1Whatcanweknowabouttheexperimentinthetext? A.Itwasconductedbyacellphoneresearcher. B.Itletstudentsexperiencearealworldwithoutsocialmedia. C.Studentslearnedtotrysomethingchallengingthroughit. D.Theauthorexploredafantasticworldduringtheexperiment. 2Whatdoablackholeandthelastmealbeforetheelectricchairindicate? A.Thetheoryoftheexperiment. B.Thepossibleresultsofstudents'research. C.Thedangersthatonemeetswithoutphones. D.Thestudents'horroratalifewithoutsmartphones. 3Howdothestudentsfeelabouttheresultoftheexperiment? A.Disappointed. B.Amazed. C.Ambiguous. D.Negative. 4Whatisthebesttitleforthetext? A.Students'discoveryofhowtoreconnectwiththeworld. B.Students'variousreactionstoonlineconnection. C.Students'eagernesstolivealifewithouttechnology. D.Students'assignmentonhowtoliveameaningfullife.
1分Thebuildingconstructatpresentisthedormitoryforourteachers.
10分Robotshavebeentakingourjobssincethe1960s.Howeverhumanshaven'tbecomecompletelyredundant多余的becausetheserobotsmaybeveryefficientbutthey'realsokindofstupid.1.Theyjustactinveryaccuratebutverylimitedways.Humansarestillneededtoworkaroundrobotsdoingthejobsthemachinescan'tdoandfixingthemwhentheygetstuck.Butthisisallsettochangethankstoanewwaveofsmarterandbettervaluemachinesthatcanadapttomultiple数量多的tasks.2. Theera时代ofIndustry4.0isbeingdrivenbythesametechnologicaladvancesthatenabletheabilitiesofthesmartphonesinourpockets.Itisamixoflow﹣costandhigh﹣powercomputershigh﹣speedcommunicationandartificialintelligence.3.Theycanadapttodifferenttasksandevenorganizetheirworktomeetdemandswithouttheinputofhumans. 4theyarestillnotassmartasus.Today'sindustrialartificialintelligenceoperatesatanarrowlevelwhichgivestheappearanceofhumanintelligenceexhibitedbymachinesbutdesignedbyhumans. 5.Similartobigdataanalysisitprocesseslargequantitiesofdatainrealtimetomakedecisionsaboutwhatisthebestactiontotake.Thedifferenceisthatthemachinelearnsfromthedatasoitcanimproveitsdecision﹣making.AperfectexampleofdeeplearningwaspresentedbyGooglesAlphaGosoftwarewhichtaughtitselftobeattheworld'sgreatestGo围棋players. A.Theydonotthink B.Butthereisstillsomewaytogo C.Whilethesemachinesaregettingsmarter D.What'scomingnextisknownasdeeplearning E.Itcomesdowntothequestionofwhatarobotreallyis F.Thischangewillbesosignificantthatitwillcreateanewindustrialrevolution. G.Thiswillproducesmartrobotswithbettersensingandcommunicationabilities.
10分假设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处错误每句中最多有两处错误.错误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. AfterschoolasusualIwentbackhome.OnthebusIfindawomanwithacutebabystandingbesidesmeandhavingdifficultyholdingontothegrabpole.InspitemyownexhaustionIrosefrommyseatandgavethemawaywithouthesitationtoherandthebaby.Shethankedmeseveraltimessincerelythatmademefeelextremelyproud.Iwasrealizedmylittlefavorcouldrealmakeadifferencetoapersonwhowasbadlyinneedofit.ArrivedhomeIalmostforgotmytiredness.IwaslostinhappinessesbecauseIdidalittleforastrangerandIgainedalot.
30分Ilearnedthislessonacoupleofyearsago.ThatdayItooka1toGrandCentralStation.Weweredrivinginthe2lanewhenallofasuddenablackcarjumpedoutofaparkingspaceright3us.Mytaxidriverslammed猛踩onhisbrakesandalmost4thecar'sbackendbyjustten5!Thedriveroftheothercarwhoalmostcausedabigaccident6hiscarandstartedyellingbad7atus.Thetaxidriverjustsmiledand8attheguy.AndImeanhewas9.SoIsaidWhydidyoujustdothat?Thisguyalmost10yourcarandsentusto11!AndthisiswhenmytaxidrivertoldmewhatInowcallthelawofthegarbagetruck. Manypeoplearelikegarbagetrucks.They12aroundfullofgarbagefulloffrustrationfullof13andfullofdisappointment.Astheirgarbage14uptheyneedaplacetodumpitandifyouagreethey'lldumpitonyou.Whensomeonewantstodumptheir15onyoudon'ttakeit16.Youjustsmilewavewishthemwelland17.You'llbehappyatwhatyoudo. IstartedthinkinghowoftendoIletgarbagetrucksrunrightoverme?AndhowoftendoItaketheirgarbageand18ittootherpeople?ThatdayIsaidI'mnotgoingtodothatanymore.Whataboutyou?Whatwillhappeninyourlifeifyouletmoregarbage19passyouby?Lifeistooshorttowakeupinthemorningwith20. 1A.taxi B.bus C.subway D.bike 2A.flat B.wide C.right D.clear 3A.inbackof B.infrontof C.beside D.beneath 4A.opened B.removed C.observed D.kissed 5A.inches B.meters C.miles D.yards 6A.squeezed B.brokeawayfrom C.gotoutof D.kicked 7A.means B.words C.languages D.solutions 8A.waved B.pointed C.aimed D.glared 9A.grateful B.aggressive C.merciful D.friendly 10A.handled B.undertook C.ruined D.abused 11A.prison B.hospital C.school D.police 12A.show B.turn C.run D.gather 13A.anger B.imagination C.confidence D.pride 14A.puts B.makes C.takes D.pile 15A.happiness B.problems C.expectation D.will 16A.differently B.attentively C.seriously D.deliberately 17A.fight B.weep C.fleeaway D.moveon 18A.bring B.spread C.convey D.offer 19A.collectors B.cans C.bags D.trucks 20A.regrets B.catastrophes C.hopes D.ambitions
1分YangLiweiisthefirstatolandonthemooninChina.
15分假定你是高三12班学生李华就学校食堂的卫生情况想给校长Mr.Smith写一封信反映以下问题:1.食物不加盖;2.品种单一;3.服务态度差. 注意:1.词数80左右; 2.可以适当增加细节以使行文连贯; 3.开头和结尾已为你写好不计入总词数. DearMr.Smith I'mLiHuaastudentfromClass12Grade3.﹣﹣﹣﹣ Thankyoufortakingthetimetoconsidermyrequests. Yours LiHua
7.5分Acellphoneisoneofthefewthingsthatweholdclosetoourfacesallthetimeandyetitcouldpossiblyexplode﹣thisiswhatmadetherecentSamsung'sGalaxyNote7smartphoneaccidentssoshocking.AccordingtotechnologynewswebsiteTheVergeflawed有瑕疵的phonebatteriesmightbetoblame.Evenifyouarenotasciencestudentyouprobablyknowthatitiscommonsensethatthenegativeendandthepositiveendofthebatteryshouldnevertouch.Iftheydothebatterywillshort﹣circuit短路causingapowerfulelectricalreactionthatcandestroythebatteryandcauseafire.Thisiswhyalllithium﹣ion锂离子batteries﹣thekindthatcanbefoundinmanyofourdevices电子设备liketabletsandcameras﹣haveaseparatorlayerinsidetostopthetwoendsfromtouchingoneanother.ButsomehowtheseparatorsinsomeoftheSamsungphonesbrokecausingexplosions.Overchargingisanotherproblemthatcanmakebatteriesheatupquickly.Fortunatelymostbatteriesaredesignedtobeabletoautomaticallystopchargingoncetheyarefullycharged.ButagainthissomehowfailedtohappeninsomeoftheSamsungphones.AccordingtoLyndenArcheramaterialsscientistatCornellUniversityUSwehavealreadyachieved90percentofthebatterylifepossiblefromalithium﹣ionbattery.Customers'demandsthattheirdevicesgetthinnerandtheirbatteryhavealongerlifehavegivenproducerslittlechoicebuttotrytoputmorepowerintothinnerbatteries.Howeverthemoreenergyyouputintoaboxthemoredangerousit'sgoingtobe.1Aseparatorlayerisputinlithium﹣ionbatteriesinorderto.A.ensurealongerbatterylifeB.reduceacertainelectricalreactionC.connecttheanodeandthecathodeD.preventabatteryfromshortcircuiting2WhatarethepossiblereasonsfortheSamsungphoneexplosions?A.Pushingthelimitsofbatteries.B.Shortcircuitingandoverheating.C.Overchargingandthinnerbatteries.D.Automaticchargingandbrokenseparators.3Whatisthewriter'smainpurposeofwritingthearticle?A.Todescribeproblemsfacingcellphoneproducers.B.Towarnusaboutthedangersoflithium﹣ionbatteries.C.Toteachuscommonsensewhenitcomestobatteries.D.ToexplainthereasonsfortheSamsungphoneexplosions.
30分Lastweekendourschoolorganizedsomevolunteerstohelp1thetrafficatthemaincrossroads.2Iwasoneofthem. Earlyinthe3fortyofusvolunteersgottogetherattheschoolgate.Beforeweleftourteachertoldussome4do'sanddon'tsfortrafficpolice.Thenwewere5hatsfluorescentvests荧光马甲andredflags.Itwasreally6tobefullyequippedforthesacred神圣的mission! Eventuallyourgroup7theappointed指定的crossroadsandoneofthe8policewomenwelcomeduswarmly.She9usintofourgroupseachofusstandingatonecornerofthecrossroads.AtfirstIfeltabit10whenthepedestrians行人lookedatuscuriously.ThenItookadeep11andtriedtogetovermyshyness.StepbystepIgotthe12ofbeingatrafficpoliceman.Whensomepassers﹣bywantedtorunthe13lightwesteppedforwardto14themwarningthemofthe15oftheircarelessbehavior.Whenolderpeoplewereaboutto16theroadwekindlyofferedtohelpthem.Withourassistancefar17peopleignoredthetrafficregulations.18havenowbecomeabeautifulpartofthesceneryinourcity. At11o'clockinthemorningourvoluntarywork19.Althoughweweretiredandhungrywefelthappyandfulfilled.Helpingothersreallydoesbringyou20. 1A.declare B.direct C.develop D.deliver 2A.Hopefully B.Luckily C.Unfortunately D.Naturally 3A.morning B.afternoon C.evening D.weekend 4A.additional B.interesting C.basic D.complex 5A.worn B.held C.handed D.given 6A.exciting B.astonishing C.frightening D.challenging 7A.slidto B.arrivedat C.pulledin D.movedon 8A.lonely B.elderly C.friendly D.silly 9A.separated B.threw C.divided D.drove 10A.embarrassed B.angry C.boring D.guilty 11A.sigh B.thought C.look D.breath 12A.hang B.rule C.trick D.method 13A.green B.red C.yellow D.orange 14A.help B.save C.stop D.catch 15A.mistakes B.dangers C.troubles D.pains 16A.take B.hit C.cross D.pass 17A.fewer B.more C.many D.less 18A.Schools B.Crossroads C.Passers﹣by D.Volunteers 19A.gaveup B.settleddown C.cametolife D.cametoanend 20A.kindness B.happiness C.tiredness D.forgiveness
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