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数据1、5、7、4、8的中位数是（ ）
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已知一组数据346788下列说法正确的是
众数是2
众数是8
中位数是6
中位数是7
下列说法正确的是
数据3，4，4，7，3的众数是4
数据0，1，2，5，a的中位数是2
一组数据的众数和中位数不可能相等
数据0，5，－7，－5，7的中位数和平均数都是0
现有一组数据2344555566778共有13个数据其样本中位数为
4
5
5.5
6
某班七个合作学习小组人数如下455x678已知这组数据的平均数是6则这组数据的中位数是
5
5.5
6
7
一组数据456778的中位数和众数分别是.
7，7
7，6.5
5.5，7
6.5，7
一组数据34x68的平均数是5则这组数据的中位数是
4
5
6
7
数据15748的中位数是
4
5
6
7
现有一组数据174386145其中位数为
3
5.5
6
一组数据456778的中位数和众数分别是
7，7
7，6.5
5.5， 7
6.5， 7
已知一组数据34456747那么这组数据的
）中位数是5.5，众数是4 （
）中位数是5，平均数是5 （
）中位数是5，众数是4 （
）中位数是4.5，平均数是5
一组数据357847的中位数是
一组数据18533的中位数是
3
3.5
4
5
数据3468x7的众数是7则数据43682x的中位数是__________.
数据1285395454的众数是_________中位数是__________
有4个数据分别为4578则中位数为
12
6
5
7
一组数据15748的中位数是
4
5
6
7
请计算下列数据的中位数和标准差63584378106
数据1285395454的众数是中位数是.
在数据1355中中位数是
3
4
5
7
若一组数据417x5的平均数为4则这组数据的中位数为
7
5
4
3
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如图扇形AOB的圆心角为直角边长为1的正方形OCDE的顶点CED分别在OAOB上过点A作AF⊥ED交ED的延长线于点F则图中阴影部分的面积等于．
10分Whetheryouworkhardtoget10000stepsadayorjustlikeadailyoutingwithyourdogwalkingisanear﹣perfectexercise.It'sgoodforyourbodyandyourmind.1.Fromstrengtheningbonestoreducingpoundsresearcherskeepfindingmoreandmorehealthbenefitsfromthissimpleactivity.NeedareasontohitthetrailorwanderthepavementHerearejustafewimpressivebenefitsofwalking. 2. Walkingkeepsyourmindsharp.InaUniversityofCaliforniaatSanFranciscostudyresearchersmeasuredthecognitiveabilitiesofnearly6000womenaged65andolder.Theytrackedtheirphysicalactivityforseveralyearsandfoundthatage﹣relatedmemorydeclinewaslowestinthewomenwhowalkedthemost. Ithelpsyoumaintainahealthyweight. 3.Regularwalkingcanleadtoweweightlossbecauseexerciseburnscalories.Butwithwalkingthecaloriesyouburndependmoreonthedistanceyoucoverratherthanyourpace.Duringa15﹣yearstudyresearchersfoundthatpeoplewhowalkedgainedsignificantlylessweightthanthosewhodidn't.4. Walkingstrengthensbonesandmuscles. Allthosestepscankeepyourbonesstrongandpreventbonelossfracturesandosteoporosis.Thatback﹣and﹣forthmovementalsoadjuststhemusclesinyourlegsandbelly.5. A.Itsavesyourbrain B.Itcanimproveyourmood C.Itmayseemlikeano﹣brainer D.Itmaysoundlikeatoughcall E.Thatisthemorepeoplewalkedthelessweighttheygained F.Furthermoreyoucandoitjustaboutanywherewithnofancyequipment G.Swingyourarmswhenyouwalkandyoucanstrengthenthosearmmusclestoo
6分Manylittlegirlslikeflowerswatchingbutterfliesandridingsmallhorses.Alotofthemalsolikecarsrobotsandspaceships.Butmostgirls'clothingonlyhaspicturesofflowersbutterfliesorhorses. Twomothersdecidedtomakeclothesthatincludeallthethingsthatlittlegirlsdoandlove. Six﹣year﹣oldBellalovestoplaywithcars.Soherdresshaspicturesofcarsonit. Wehaven'tfoundthistypeofdressinthestoreCathyBella'smothersays. Thecardressisfromanewgirl'sclothinglinecalledPrincessAwesome.RebeccaMelskysetupthebusiness.Shesaysitsproductsforgirlshavesomedesignsnormallyfoundonboys'clothes. ItallstartedtwoyearsagowhenRebeccawashopingtobuyclothingforhertwo﹣year﹣oldwholikedrobotstrucksandspaceships. OnedaywhenIwalkedthroughagirls'storeIthoughttomyselfIwishthey'dmakeoneofthosebeautifuldressesthatalsohavearobotonitbecauseshewilllovethat.AndIthoughtsomeoneshoulddothat.MaybeIshoulddothatRebeccasaid. HerfriendEvaSt.Clairbelievedsheshouldandtheirbusinesswasborn.Thewomensoldthefirst70dressestheymadeatamarket.Sotheydecidedtoexpandtheirbusinessonline.Theirproductssoldverywelltheretoo. TheysoldoutsofastthatIcouldnotmakethemfastenough.WedecideditwastimetothinkaboutafactoryRebeccasaid. SotheystartedtoraisemoneyfrompeopleovertheInternet.Thewomenraisedmorethan215000withindaysfarmorethanthe35000theyexpected. OurbiggestchallengeisgoingtobehowweexpandasrapidlyaspeopleseemtowantustoRebeccasaid. ThewomenhopePrincessAwesomewillexpandintoproductsforgirlsofallagesandallinterests. 1PrincessAwesomewasstarted. A.byCathyandRebecca B.becauseofsix﹣year﹣oldBella C.withthehelpofagirls'store D.tomakeunusualclothingforgirls 2ThedressesmadebyRebeccaandherfriend. A.soldbetteronlinethanatthemarket B.helpedthemgetajobinafactory C.werepopularamonggirls D.weresoldexpensively 4WhatisthemostdifficultthingRebeccaandherfriendwillface A.Meetingtheneedsofallgirls. B.Howtomakeinterestingproducts. C.Raisingenoughmoneyfortheirbusiness. D.Howtoexpandtheirbusinessaspeopleexpected.
8分Ihopeyouwilljoinustodeveloptheproject.Theideastruckmeinearly2017.Weweresittinginourclasswhenourheadteacherannounced.There'11beanewboystartingschooltomorrow.Hecomesfromthecircussohe'llbewithusforawhile.ImmediatelyIheardremarkslikeThosearedirtypeopleTheyeatrawmeatandWatchoutyourbags.TheteachermusthaveheardthemandsaidinaveryseriousvoiceJakeisourguest.Makesureyoutreathimwell. ItwasthefirsttimeIhadmetanyonefromacircus.Fortunatelyhesatintheonlyspareseatnexttome.OfcourseIdidn'twanttomindothers'businessbutIcouldn'thelplookingathimsideways.InoticedJakewassmallerthanmeandhaddirtyfingernails.Hisshirtwascleanbuthadbeenrepairedinmanyplacesandhistrouserswereheldupbyawideleatherbelt.AshewassniffingloudlyIpassedhimmyhandkerchief.ImmediatelytheboysbegantowhisperLeavehimbe!FrommyleftaslightmovementshowedthatJakemusthaveheardtheremarkstoo.Heseemedtobehavinggreatdifficultywithhismathsworkandwasstrugglingtoholdhispencorrectly.Helookedaroundasifforhelp.Ilookedaroundtoo.TheteacherwasbusysoIofferedtoexplaintheproblemstohim.Ashelistenedhesmiled.Hiseyeslitupandhereturnedtotheexerciseswithenthusiasm.Hefinishedthemquicklyandproudlypresentedthemtotheteacher.WelldoneJakesheapproved.Jakesmiled. IthoughtabouthowJake'slifewouldbe.Irememberedseeingthecampsiteandthinkinghowpoorthefacilities设施were.SoIdecidedtohelp.Asitwasmyturntosuggestaprojectforourgrade.Iputforwardthisidea.Ourheadteacheraccepteditandsowebegantoprepareourplanstoimprovethecampsite.Hopeyouwilljoinus. 1WhydidthestudentsdislikeJakeevenbeforetheysawhim A.Anewcomerwasnotwelcomeatthattime. B.Theyalwaysjudgedapersonbywhathelookslike. C.Theteacherhadn'tintroducedJaketothembeforehand. D.Theymusthaveheardterriblestoriesaboutcircuspeople. 2What'stheauthor'sattitudetowardsJake A.Hecopiedtheotherboys'behavior. B.HewasdistantaboutwhatJake'slifewaslike. C.Hehadsympathyforthepeoplewhowereinneed. D.Hecouldn'tignorewhatotherpeoplesaidaboutJake. 3WiththehelpoftheauthorJakebecamemore. A.friendlyandbrave B.confidentandproud C.easygoingandhelpful D.optimisticandwarm﹣hearted 4What'stheauthor'smainpurposeinwritingthispassage A.TocallonmorepeopletohelpJake. B.Toshowwhatisinneedforacircus. C.Toaskthereaderstojoininhisproject. D.Toarguecircuspeopleshouldbefairlytreated.
下列四个命题①直径所对的圆周角是直角②圆既是轴对称图形又是中心对称图形③在同圆中相等的圆周角所对的弦相等④三点确定一个圆．其中正确命题的个数为
6分Herearesomegreateventsforyourfreetime. 1Whatcanwomenchoosetodoiftheywanttoknowsomethingtofaceinlife A.JointhecarnivalatDreamland. B.EnjoytheconcertsontheLongBeach. C.VisitanexhibitattheWilliamRisGallery. D.ExperiencethemusicfestivalatBrooklyn. 2Howmuchshouldamotherwithher10﹣year﹣oldchildpayforconcertsontheLongBeach A.﹩80. B.﹩100. C.﹩120. D.﹩144. 3Whichofthefollowingeventslaststheshortesttime A.NorthsideFestival. B.SolelyWomen. C.BroadwayCommonsCarnival. D.LongIsland'sFestival.
如图四边形ABCDCEFG都是正方形点G在线段CD上连接BGDEDE和FG相交于点O设AB＝aCG＝ba＞b．下列结论①△BCG≌△DCE②BG⊥DE③＝④a﹣b2•S△EFO＝b2•S△DGO．其中结论正确的个数是
25分假定你是李华为了提高英语阅读能力想寻求美国朋友Peter的帮助.请你给他发一封电子邮件内容包括 1.介绍你最近学习英语的情况 2.请求他给些建议并推荐英文杂志 3.表达谢意. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯.
8分Manynewparkshaveappearedintheworld.Twonewmarine海的parksthattogethermakeupanareawiththesizeofHungaryhavebeencreatedinthePatagonianSea. OneiscalledYaganesandislocatedjustoffthesoutherntipofArgentina﹣aspotnick﹣namedtheendoftheworld.TheotherNamuncura﹣BurdwoodBankIIisintheSouthAtlantic.Togethertheymakeup37000squaremilesofmarineprotectedareasMPAsfullofseacreaturesmanyofwhichareclassifiedasthreatenedspecies. PartsofthesenewMPAshaveremainedpristinebecauseoftheirremotenessandtheArgentiniangovernment'sdecisiontoprotectthemensuresthatthemarineecosystemswillstaythatway.ConservationistsarehopingthismovesignalsashifttowardstrongerconservationmeasuresintheCountry.Notonlybecausethedecisionshowsmoreprotectedterritorybutalsobecauseitcomeswithalegalframeworktocarryoutthenewrestrictions. Withthecreationofthesetwonewmarineprotectedareas8percentofArgentina'swatersarenowprotectedbringingthecountryclosertoitsgoalofprotecting10percentofitsnationalwatersby2020. MPAsareapopulartoolusedbygovernmentstomeettheUnitedNations'largergoalofprotecting10percentoftheWorld'soceansby2020.ByclosingregionstoactivitieslikefishingMPAscanallowfishstockstorecoverwhichthenspillouttocommercialareas.InapreviousinterviewwithNationalGeographicformerNOAAadministratorJaneLubchenco1ikenedMPAstoashotofpreventivemedicinebeforethebeginningofacold. AMarchstudypartiallysupportedbyPristineSeasfoundthatmanydeclaredprotectedareasaroundtheglobearenoteffectivelyenforced.Andevenwithcountries'self﹣reportedconservationdeclarationstheUNispredictedtofallshortofitsgoal.ButcountrieslikeArgentinaaren'tgivingup.Argentinaiscatchinguponmarineconservation.Nowit'sbecomingaworldleaderinworldconservation. 1Whatwastheaimtocreatethetwomarineparks A.TobuildthesamesizeareaasHungary. B.Toprotectthemarineenvironmentandcreatures. C.Tochangeconservationmeasuresinthecountry. D.Torealizethegoalofprotectingtheworld'sanimals. 2Whatdoestheunderlinedwordpristineinparagraph3mean A.Primitive. B.Dangerous. C.Unpopular. D.Substantial. 3WhatmeasuredidArgentiniantaketodowiththeMPAs A.Itplannedtobeaworldleaderinworldconservation. B.Itpassedsome1awstoensuretheywereprotectedwell. C.Itcarriedoutsomenewrestrictionstoforbidfishing. D.Itdecreasedthegoalofprotectingitsnationalwaters. 4WhatdoesJaneLubchencothinkofMPAs A.Manyofthemarenoteffectivelyprotected. B.Theycankeepfishfromincreasingtoofast. C.Someofthemshouldbeusedascommercialareas. D.Theyaresignificantinprotectingtheoceanenvironment.
8分Mostpeopleprobablywonderedwhowouldvoluntarilychoosetoliveinacooperativehousewith14otherpeople.WellIwouldandformeit'soneofthebestdecisionsI'vemadeformyself. Thehousehasthreefloorsand15bedrooms.Ithascommunalspacessuchasthekitchenbathrooms1ivingroom.andbigolddiningtablewherewetalklaughdisagreeplaygameslearnfromeachotherandmostimportantlybreakbreadtogether. MyhousematesandIsharethehouseworkanddothecookcyclewhichgenerallymeanscookingdinnerforthehouseaboutonceeverytwoweeksandweattendweeklyhousemeetingswherewemakedecisionsabouttheoperationsofthehousetogether. WhatIworriedmostaboutatfirstwashowmysonmightfeelaboutthenewhousingsituation.Tomysurpriseheloveditbythefirstvisittothehouse!Hehasnevercomplainedaboutthishousebeingsmallerthanhisdad's.Oneofmyhousemateshastwochildrenhisagegohenowhastwonewfriends.ThisisimportantformeasaparentbecauseIwanttoteachhimthathappinessdoesn'tcomefromthesizeofyourhomebutfromthelovethatisinside. WhenIlivedwitharoommateincollegeweneverdiscussedaboutanyagreementsonquiethourscleaningupthecommunalareasandsoon.Everycauseofconflictduringthattimewasduetolackofcommunication.Onthecontraryinourhousewetalkaboutandhavepoliciesonalmosteverything. Besideslesscostonhousing.I'mmoreconcernedabouttheconnectionwithotherpeoplethatIwaslongingfor.Cooperativelivingisn'tforeveryonebutwithincreasingcostsoflivinganddecreasingconnectionwithotherpeopleitcandefinitelybeagreatoptionformorepeople. 1WhatmighttheunderlinedbreakbreadinParagraph2mean A.Havingdinner. B.Cookingdinner. C.Earningbread. D.Bakingbread. 2Howdoesthesonfeelaboutlivinginthishouse A.It'sfunwithnewfriends. B.It'ssmallandcrowded. C.It'sannoyingindiscussions. D.It'stiringtodocleaning. 3Whydoestheauthormentionhercollegelife A.Toexpresstheregretatthosewasteddays. B.Toconveythegratitudetoherroommates. C.Toshowtheimportanceofgoodrelationships. D.Tostressthenecessityofcommunicationandrules. 4Whatmattersmostfortheauthor'schoiceofcooperativeliving A.Cuttingdownonlivingcost. B.Learningtobeindependent. C.Gettingconnectedwithpeople. D.Offeringahomeforherson.
6分BroadBandbyClaireL.Evans.Portfolio2018﹩27 Thoughoftenoutnumberedbymenwomenstayedincheboomingfieldofcomputing.InthisinspiringtalewriterEvansrecordsthecontributionsofsomeofthemanywomenwhoaidedtheriseofthemodernInlernet.MemorablecharactersincludeElizabethJakeFeinleraninformationscientistwhohelpedresearchersnavigatetheArpaneandStacyHornwhostartedoneofthefirstsocialnetworksEcho. TheWizardandtheProphetbyCharlesC.Mann.Knopf2018﹩28.95 Thehumanpopulationismovingtoward10billion﹣someexpertstliinkwe'llnearlyhitthatmarkby2050.Howwill.theearthfeedhouseandotherwisesupportsuchacrowdEnvironmentalthinkersusuallyfallintooneoftwocampsthosewhopreferconservationand'controllingconsumptionlikeWilliamVogtandthosewhotrustinnovationtosolveourproblemsNormanBorlaugforexample.WriterManncarefullyrecordsthelivesandthoughtofthefoundersofthesetwophilosophies. ALabofOne'sOwnbyPatriciaFara.OxfordUniversityPtess2018﹩24.95 InWorldWarImanywomenintheU.K.replacedtheirapronswithchemicalsuitsandsteppedintopreviouslymale﹣onlyfieldsofsciencewheretheyledwarresearchefforts.SciencehistorianFaraillustratesthelivesofmanyoftheseforgottenwomen.Althoughtheeramarkedamajorstepforwardforwomenscientistsmanyworkedforsmallwagesinanenvironmentofdiscrimination.Inthenearly100yearssincewomenhavecomealongwayFarawritesbuttheglassceilingsremainsolidandthepipelinesleaky. AtomLandbyJonButterworth.TheExperiment2018﹩19.95 Butterworthtakesreadersonanamusingjourneythroughtheunknownworldofparticle粒子physics.ThefirststopisAtomLandwhereButterworthexplainshowelectronsprotonsandneutronscometogethertobuildupeverythingweknow.Asthejoumeyunfoldswelearnaboutlesser﹣knownparticles.Thankfullyourshipisequippedwithtoolssuchasmathematicalequations方程式andalaserlightthatlightsupthedarkestofconcepts. 1Whofocusesonthefutureofourearth A.ClaireL.Evans. B.CharlesC.Mann. C.PatriciaFara. D.JonButterworth. 2Whichbookswillyouprobablyreadifyouareinterestedinwomen'scareer A.BroadBand&AtomLand. B.TheWizardandtheProphet&AtomLand. C.BroadBan.d&ALabofOne'sOwn. D.ALabofOne'sOwn&AtomLand. 3What'sthepurposeinwritingthetext A.Toclarifysomeconcepts. B.Toiritroducesomefamouswriters. C.Togivethebookreviews. D.Torecommendthebooks.
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