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如图，已知⊙O为四边形ABCD的外接圆，O为圆心，若∠BCD＝120°，AB＝AD＝2，则⊙O的半径长为 ．
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如图已知⊙O为四边形ABCD的外接圆O为圆心若∠BCD=120°AB=AD=2则⊙O的半径长为
如图7点P.是四边形ABCD外接圆⊙O.上任意一点且不与四边形顶点重合若AD是⊙O.的直径AB=BC
已知如图圆O是△ABC的外接圆圆心O在这个三角形的高CD上EF分别是边AC和BC的中点求证四边形C
已知如图⊙O.是△ABC的外接圆圆心O.在这个三角形的高CD上E.F.分别是边AC和BC的中点求证四
已知如图四边形ABCD为菱形△ABD的外接圆⊙O与CD相切于点D.交AC于点E.1判断⊙O与BC的位
如图四边形ABCD的对角线CA平分∠BCD且AD=ABCE⊥CB于E.点O.为四边形ABCD的外接圆
其中正确的结论是 A. ①③④
①②④
②③④
①②③
已知圆内接四边形ABCD的边Ⅰ求角C.的大小和BD的长Ⅱ求四边形ABCD的面积及外接圆的半径.
如图1已知圆O.是等边△ABC的外接圆过O.点作MN//BC分别交ABAC于M.N.且MN=a另一个
如图四边形OABC是平行四边形以O.为圆心OA为半径的圆交AB于D.延长AO交⊙O.于E.连接CDC
已知如图四边形ABCD为菱形△ABD的外接圆⊙O.与CD相切于点D.交AC于点E.1判断⊙O.与BC
如图已知四边形ABCD是平行四边形AD与△ABC的外接圆⊙O恰好相切于点A.边CD与⊙O相交于点E.
已知平行四边形ABCD对角线ACBD交于点O.1若AB=BC则平行四边形ABCD是_________
已知四棱锥P-ABCD的底面四边形ABCD的外接圆半径为3且此外接圆圆心到P点距离为2则此四棱锥体
12
6
32
24
如图四边形ABCD为⊙O的内接四边形⊙O为四边形ABCD的外接圆．求证∠A+∠BCD=180°
已知如图四边形ABCD为菱形△ABD的外接圆⊙O.与CD相切于点D.交AC于点E.1判断⊙O.与BC
已知如图圆O是△ABC的外接圆圆心O在这个三角形的高CD上EF分别是边AC和BC的中点求证四边形C
命题任意四边形都有外接圆的否定为
任意四边形都没有外接圆
任意四边形不都有外接圆
有的四边形没有外接圆
有的四边形有外接圆
四边形ABCD为圆O.的内接四边形已知∠BOD=100°则∠BCD=.
四边形ABCD为圆O.的内接四边形已知∠BOD=100°则∠BCD=.
如图四边形OABC是平行四边形以O.为圆心OA为半径的圆交AB于D.延长AO交⊙O.于E.连接CDC
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HighlightsofIceland Day1 OurrepresentativewillmeetyouattheairportandabuswillbringyoutoyourhotelinthecapitalReykjavik.Aftercheckinginyourguidewillleadyoutovisitsomeofthecity'shighlights. Day2 WetourIceland^GoldenCircletakinginThingvellirNationalParkandgullfossWaterfallandseeTrokkurwhichspouts喷射a100﹣footjetofwaterintotheairevery3﹣5minutes. Day3 Day3isleftfreesothatyoucantryoutouroptionaltours.ExploretheThorsmorkValleyonajeepride.Anotheroptionistodriveoutontotheglaciers冰川andtakeasnowmobiletour.Whale﹣watchingboattripsarealsoavailablefromReykjavikharbour. Day4 Thetourendsatthecityairport. UsefulInformation •ThelocalcurrencyistheIcelandicKronaISK.Theoptionaltoursonday3costextraandaminimumof4peopleisrequiredforboththejeepandsnowmobilingtours. CurrentcostsThorsmorkJeeptour27000ISKsnowmobiletour34200ISKwhale﹣watchingsummeronly9000ISK. •Tippingisvoluntarybutisexpectedinthispartoftheworldforworkersinthetourismindustry. •Youmusthavetravelinsurancetotravelonourtours.Youcanarrangeforthisyourselforbuyitthroughourcompany. •Youcaneitherbookaflightwithusorarrangeyourownflight.Ifyouchoosethelatteryouwillhavetomakeyourownwaytothehoteldetailsofwhichwillbesenttoyouinadvance. 1OnwhichdaycanthetouristsseeGullfossWaterfall? A.Day1. B.Day2. C.Day3. D.Day4. 2Whatcanbelearnedaboutthewhale﹣watchingtour? A.Itisoneoftheoptionaltours. B.Itisavailableallyearround. C.Itcostsmorethanthesnowmobiletour. D.Itrequiresatleastfourpeopleforeachtour. 3Whatisrequiredofthetourists? A.Tippingtheirguides. B.Bookingaflightwiththetourcompany. C.Reachingtheirhotelinadvance. D.Buyingtravelinsurance.
假定你是李华你校将迎接英国学生代表团.作为学校书法社团部长请你写一篇发言稿要点如下 1.介绍书法用品 2.阐述书法学习的好处 3.邀请英国学生参加书法练习活动 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.开头已为你写好. 参考词汇书法calligraphy 文房四宝theFourTreasuresoftheStudywritingbrushinkstickpaperinkslab Dearfriends We'dliketoshareourculturewithyoubyintroducingyoutotheartofChinesecalligraphy.
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Forhealthyadultsexpertssaythateatingalotoffruitisunlikelytogetyouintotroubleaslongasit'spartof1normaldiet. Themainconcernwithovereatingfruitis2itnaturalsugaryetresearchhasalwayslinkedwhole﹣fruiteatingtoa3reduceriskforobesityandotherdiseases.That'sbecausewholefruithasafewbuilt﹣in4advaniagethatseemtoreduceanysugar﹣drivenhealthrisks.Itcontainstwokindsoffiberwhichformabarrierontheinsideofthesmallintestine肠.Thisbarrierlimitstherateofsugarabsorbingsothattheliver肝isnotharmedjustlikestoppingalargewave5buildinganunderwaterwall.Fruitfiberalso6helpfoodreachthefinalpartofyoursmallintestinesoonersoyoutendtofeelfull7quickaftereatingfruit.Asaresultthechancesyouwillovereatfruitarerelativelylow. Somefruitsmaybebetter8eatthanothers.Forexampleberrieshavebeenlinkedtobothbetterheartandbetterbrainhealth.9grapesmayneedmoreself﹣control.They'remainlylittlebagsofsugar. Ifyoulovewholefruitthere'slittleevidencetoshow10eatingit一evenawholelotofit﹣isbadforyourhealth.
WhyYouShouldn'tPunishYourKidsForLyingIt'snoeasytasktostopyourchildrenlying.TherearemanyinfluencesTVmoviesvideogamesandsomegreatbooksinwhichliesarecommon.Childrenseeparentslietoothersonlytobepolite.MostparentsaddtothatwithtalesaboutthelivesandactivitiesofSantaClausortheToothFairytobringjoyortolessenfears.1butforsomechildrenlyingcanbecomeaproblem.Themostcommonreactionstochildrenwholieareexplainingwhyitiswrongandpunishingthem.2.Herearethreebettertoolssupportedbyresearchtouseinstead.PRAISEYoucouldaskyourchildtosaysomethingthathappenedatschoolthatistrue.Whenyourchildobeyspraisehimenthusiastically.Bespecific'Thatwasgreat!YoutoldmewhathappenedjustasIasked.Wow!'andgiveyourchildahugorahighfive.Aimforoneortwointeractions互动likethisaday.Ifyouhappento'catch'yourchildinaliesaysomethinglike'Thatisnottrueandcouldgetyouintroubleoutsideofthehome.'MODEL3.Thiscouldbeaboutsomethingthathappenedwhenyouwereachildorsomethingthathappenedduringtheday.Itneednotbedramatic.Anotheroptionistoplayagameatdinner.Eachpersontellsonethingthatwastruethatday.Againgivealittlepraisetothechildwhonormallyliesifheplaysalong.DECREASEPUNISHMENTANDMORALIZINGSomechildrenareunlikelytochangebehaviorordeveloptheconductyouwant.Thatdoesnotmeanyoucanignoretheirlyingorletitgo.Ratheruseverymildpunishmentlightscoldingshortlossofprivilegeabrieftime﹣out.4.Trytheseproceduresfortwotothreeweeksandseewhereyouare.Usuallyliescanbedroppedbythen.5butwiththerightencouragementcanbedramaticallylessened.A.ParentspunishchildrenbecausetheyareinapositionofgreaterpowerB.ButaswaysofchangingbehaviortheseareineffectiveC.TheythinkitunnecessaryforchildrentotellalieD.ParentsdothisoutofloveE.SeverepunishmentsarenotalwayseffectiveinactuallychangingthefrequencyoflyingF.YoushouldsetagoodexampletoyourkidsandexplicitlytellthetruthG.Itisunlikelythatlyingwillbecompletelyremoved
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已知抛物线y＝x2+bx+c经过A10B02两点顶点为D． 1求抛物线的解析式 2将△OAB绕点A顺时针旋转90°后点B落到点C的位置将抛物线沿y轴平移后经过点C求平移后所得图象的函数关系式．
Helpfultipsforcollege﹣boundseniors Researchingacollegeisoneofthemosttime﹣consumingtasksthatyou'llencounter.1Forexamplewhatclassesandfacilitiesthecollegehastoofferandwhatsportsitoffers.Afternarrowingyourchoicestoagroupofcollegesyou'llhavetostarttoresearchtheseindepth.2Heorshemaybeabletohelpyoufindthingsaboutthecollegesthatyoucouldnotgetyourself. Knowingwhatyouwanttostudyisanotherkeytolookingforacollege.3ByknowingwhatIwanttodoIcanthenlookatcollegesthatI'vebeenthinkingaboutapplyingtoandnarrowmychoicesdown.Ifacollegedoesn'thavethecoursesIneedthenit'sdefinitelyoutofthepicture. Anotherkeythingtolookforisthecollege'stestingrequirements.4SomecollegesalsorequireanSATIItestincertainareasforexampleEnglishorMath.Remembertolookatacollege'sGPArequirementstoo.Youmayfindacollegewherethere'severythingyouwantbutyourGPAisn'thighenoughtobeconsidered.Inthiscaseyoumayneedtoattendajuniorcollegeforoneortwoyears. 5Atthispointyoumaywanttohavealongdiscussionwithyourparentsandfindouthowmuchthey'rewillingandabletospendoncollege.Ifitisn'tenoughtocoveryourfulltuitionthenyoumaywanttoapplyforfinancialaidorascholarship.Andyourfinaloptionmaybelookingforacollegethatdoesn'tcostasmuch. A.AllcollegesrequireanSAToranACTtest. B.Andlastlybutdefinitelynottheleastistuition. C.Lookforacollegenowifyouplanonattendingone. D.Youneedtofindoutmanybasicsaboutpossiblecolleges. E.Ifyouwillbeaseniorinthenearfuturethisarticleisforyou. F.Iplantomajorinbusinessmanagementandminorincomputerapplications. G.Ifyouhaveacollegecounseloratyourschoolthiswouldbeagoodtimetoaskforadvice.
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解方程＝﹣3．
如图在物理课上小明用弹簧秤将铁块A悬于盛有水的水槽中然后匀速向上提起直至铁块完全露出水面一定高度则下图能反映弹簧秤的读数y单位N与铁块被提起的高度x单位cm之间的函数关系的大致图象是
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如图△ABC是⊙O的内接正三角形图中阴影部分的面积是12π则⊙O的半径为．
如图四边形ABCD是矩形AB＝6BC＝8点P从A出发在线段AD上以1个单位/秒向点D运动点Q同时从点C出发以1个单位/秒的速度向点A运动当点P到达点D时点Q也随之停止运动． 1设△APQ的面积为S点P的运行时间为t求S与t的函数关系式 2t取几时S的值最大最大值是多少 3当t为何值时△APQ是等腰三角形
DutchdesignerDaanRoosegaardehasspentmuchofhistimeseekingartisticsolutions解决方案tosolveourenvironmentalproblems.HispastprojectsincludeBioluminescent生物发光TreestolightstreetsaSmog﹣FreeTowertocleanBeijing'spollutedair.andGatesofLight.whichusestheheadlampsofpassingcarstolightupthe60floodgatesoftheAfsluitdijkamajordamintheNetherlands.Nowheishopingtousehisskillstosolveapressingglobalproblem﹣spacejunk! Scientistsguessthatthereareover500000bitsoflargerubbish.TodealwiththeproblemRoosegaardeintendstoachievehisgoalbyeducatingthepublicabouttheneedofthesituationandcomingupwithpossiblesolutions.Theplan.calledtheSpaceWasteLab.startedinOctober2018withalaser激光showintheNetherlands.TheuniqueoutdoorartworkofLEDsusedreal﹣timetrackinginformationtopointatpiecesofspacejunkfloatingataltitudesof200to20000kilometers.Theexperiencewasdesignedtomakethepublicknowmoreabouthowmuchspacejunkthereare. Tofindasolutionthedesignerhasbeenthinkingwithexperts.OneoftheprojectsbeingconsideredisShootingStarswhichattemptstoreintroducethetrashtotheatmosphereinacontrolledway.Uponreentry.thewastewouldburnintheatmospherelikeashootingstar.Roosegaardeenvisagesthatifsuccessful.burningspacetrashcouldsomedayreplacefireworksatlargepublicevents! InSeptember2018.theRemoveDEBRISsatellitesuccessfullysentanettocatchatargetwhileorbitingatanaltitudeofabout300kilometers190miles.Sometimethisyear.thecapsulewillsetfreeaharpoonthathasbeendesignedtoremovespacetrash.AttheendofitstaskRemoveDEBRISwillletgoasailtobringthesatelliteitself.and.hopefullysometrashbackintotheatmosphere.whereitwillburnup. 1WhatcanweinferaboutDaanRoosegaarde? A.Heistooaggressivetoputforwardgoodplans. B.Heiscreativeinsolvingenvironmentalproblems. C.Heisfondofspendingallofhistimeseekingartskills. D.Heissensitivetoartreflectedinenvironmentalprojects. 2WhywasalasershowheldinOctober2018? A.Toconfirmreal﹣timeinformationaboutspacetrash. B.ToshowthegreatbeautyofLEDtocommonpeople. C.Toraisepublicawarenessoftheamountofspacetrash. D.Toinspirepeopletoconsiderthesolutiontospacetrash. 3Whatdoestheunderlinedwordenvisageinparagraph3probablymean? A.Suspect. B.Demand. C.Advise. D.Imagine. 4Whatisthefunctionofasail? A.Bringingthesatellitetoatmospheretoburn. B.Keepingtrashtravelingalongitsownorbit. C.Takingthesatelliteawayfromatmosphere. D.Removingspacetrashoutofthecapsule.
PTSD战后创伤issadlyacommonaffliction折磨formanysoldierswhohavewitnessedconflictaninvisiblewoundthatcontinuestocauseincrediblesufferinglongafterthegunshavefallensilent. AlotofuscomehomewithoutrealizingwearebringingthewarhomewithussaidJoshMarinoaveteran退伍兵oftheIraqwarwhosufferedtheeffectsofPTSDofsuicide. Ididn'twanttodealwithitanymoreMarinosaid.Hewroteagoodbyenotegrabbedaknifeandwentoutsideforafinalcigaretteintherain.Butthenfromthedeepestdepthofdespaircamehope.Meowingoutofthebushesnexttohimcameastrayblackandwhitekitten小猫whichaccordingtoMarinojustwalkedupandstartedrubbingupagainstmylegandletmepethim.IcametolifeagainandIbrokedowncrying.Iburstintotears. Fromthisaccidentalencountereverythingchanged.MarinofoundanewpurposeinlifethroughthefriendlycatwhohenamedScoutandwhohecreditswithsavinghislife.IstoppedthinkingaboutallmyproblemsandstartedthinkingaboutallhisproblemsandwhatIcoulddotohelphimMarinosaid.Thebondbetweenthemwasinstantbutthatwasn'ttheendofthestory. MarinohasmadeavideoofhisandScout'sremarkablestoryofhealingandheartbreakwhichyoucanwatchontheInternet.Thestoryisdedicatedtoshowinghowanimalscanhelphumansthroughtoughtimesaswellashumanscanhelpthem.Itisabeautifulstorythatissuretotugatyourheartstringsshowingjusthowpowerfulthebondbetweenhumansandanimalscanbe.Weloveitandwehopeyoudotoo! 1Whatcanwegetfromthefirsttwoparagraphs? A.TakingpartintheIraqwarhadbadeffectsonJoshMarino. B.JoshMarinowoundedbadlyduringtheIraqwar. C.PTSDisakindofdiseasewhichcannotbecurednow. D.PTSDusuallyhappensafterthesoldiersdroptheirguns. 2WhydidJoshMarinosuddenlyburstintotearsaccordingtothepassage? A.Hejustcouldn'thelpcrying. B.Thelittlecatgavehimhopetotreasurelife. C.Thewildlittlecatattackedhimsobadly. D.Hesuddenlyrealizedthatthecatcametohelphimonpurpose. 3Whatisthebesttitleforthepassage? A.PTSD﹣adiseasecuredbyasoldier. B.Themanandthecat. C.Arescuebetweenasoldierandacat. D.Howcanacatbeusedtostopsuicide.
VolunteersarevitallyimportantforMelbourne'stourism.TheyprovideinformationonMelbourneforaroundtwomillionvisitorseachyear.TheirloveandknowledgeofthecityaddtoMelbourne'sreputationasafriendlywelcomingandculturallyvibrantcity.Ifyouwouldliketoreceiveanemailadvisingyouonthenextrecruitment招募sessionpleaseemailtourism@melbourne.vic.gov.au.TheCityofMelbourne'stourismbranchgenerallyconductstwovolunteerrecruitmentintakeseachyearforthefollowingtourismprograms*CityAmbassadors*MelbourneVisitorBoothatBourkeStreetMall*MelbourneVisitorCentreatFederationSquare*MelbourneGreeterServicePlacesarelimitedandpotentialvolunteersmustparticipateinaselectionprocessbasedonthefollowingcriteria.Volunteersmustbe*passionateaboutMelbourne*customerservicefocused*familiarwithcomputer*availableforonefour﹣hourshift轮班eithermorningorafternooneveryfortnightforaminimumofoneyear*teamplayerswholovemeetingpeople*abletodemonstrateacommitmenttotheCityofMelbourne'svaluesMoreinformationTofindoutmoreaboutbecomingavolunteercontactusonlineorphonetheCityofMelbourne'sVolunteerProjectOfficerTourismMelbourneon0396589658.ForothervolunteeringopportunitiesseenationalvolunteerrecruitmentwebsiteGoVolunteer.1WhichofthefollowingisNOToneofthequalificationstobeavolunteer?A.Beingwillingtocooperate.B.Havingcomputerskills.C.Beingabletodoshiftworkeverynightforayear.D.HavingpassionforMelbourne.2Howcanyougetothervolunteeringchances?A.Byemailingtourism@melbourne.vie.gov.au.B.Byseeingnationalvolunteerrecruitmentwebsite.C.ByphoningtheCityofMelbourne'sVolunteerProjectOfficer.D.BycontactingTourismMelbourneonline.3Whereisthetextmostprobablytakenfrom?A.Agovernmentwebsite.B.Aradioreport.C.Abookreview.D.Ageographytextbook.4Whatmaybethebesttitleforthetext?A.GuidetoTouringinMelbourneB.WelcometotheCityofMelbourne!C.DoesVolunteeringPayBack?D.TourismVolunteerProgram!
Pictureaniceberg冰山.You'llprobablyimaginesomethingwhiteassnowrisingupoutofabluesea.Buticebergscanbeallsortsofshades.Theycanbefromafrostybluetoanattractivegreen. Researchersandsailorshaveobservedemerald翠绿色icebergsforyears.Alargepieceoficemast﹣highandgreenasemeraldevenappearsinSamuelTaylorColeridge's1834poem.Buttheyhaven'tfoundoutexactlywhytheseicebergslookthewaytheydo. AnewpaperledbyStephenWarrenwaspublished.Itallhastodowithwhaticebergsaremadeoutof.Icebergsbreakoffglaciers冰川oriceshelveswhichhappensmainlyaroundAntarcticaandGreenland.Theybegintheirlivesassnowfallthataccumulatesovertime.So.icebergscontainairpocketswiththeformofbubblesthatspreadlight.Withsomeexceptionsandrarelinesglaciericetendstolookbluishwhite. AtfirstWarrenguessedthatthegreenwasaproductofmeltcarbon.Anditcamefromrottingplantsorseaanimals.Butsamples样本didn'tproveit.AnotherideastartedtotakeshapeaftertheyhadfoundahighconcentrationofironinasampleofseaicefromtheAmeryIceShelf. Whenglaciersrubacrosslandtheyproducewhat'sknownasglacierflour.Itisaproductofbedrockbeinggroundclownbythemovingmass.Asglaciersmoveawaytheseremainsareusuallywashedoutintowater.inparticlessometimestoosmalltobenoticeabletoyoureyes.Butonland.soilandrockscontainironoxidesthatoftenhaverosycolors.likeredsyellowsandbrowns﹣andsincetheseaicecontained500timesmoreironthantheglaciericeWarrenwonderedwhethertheremainswereresponsibleforicebergstakingonagreenappearance. Hedoesn'tknowforsure.He'shopingtosecuremoneysothathecanreturntotheareaandstudytheicebergsthemselves. 1WhyisSamuelTaylorColeridge'spoemmentionedinthetext? A.Ittellswhyicebergslookthewaytheydo. B.Itdescribesvividlywhaticebergsarelike. C.Itsayscausesoftheappearanceoficebergs. D.Itprovestheexistenceofcolorfulicebergs. 2WhatcanweknowaboutStephenWarren'spaper? A.Itdrawsonresearchers'andsailors'views. B.Itistherecordofthemovementoficebergs. C.Ittalksabouthowicebergscomeintobeing. D.Itisacollectionofvarioussocialphenomena. 3Whatdoestheunderlinedworditinparagraph4referto? A.Asampleofseaice. B.Warren'sfirstguess. C.Warren'sideaoniron. D.Aproductofmeltcarbon. 4Whatisparagraph5mainlyabout? A.Thepossiblereasonwhyicebergslookgreen. B.Wheremostoficebergseventuallydisappear. C.Howicebergstakeinthecolorsfromglaciers. D.Thewayinwhichicebergsbreaksoffglaciers.
如图在2×2的网格中以顶点O为圆心以2个单位长度为半径作圆弧交图中格线于点A则tan∠ABO的值为．
Whenadisasterstrikeshumanitarianagencies人道主义机构likeTheWorldFoodProgrammeWFPneedinformationmorethananythingelse.Theyneedaclearpictureofthedamagetoroadsandbridgesforexampletobeabletotakequickaction. WFPhaspublishedapictureofdamagetotheepicenter震中oftheearthquakewhichstruckHaiti.Thepicturewhichhasbeenproducedintheformofasatellite﹣basedmapshowsgreatdamagetotheepicenterwhere90%ofthebuildingsweredestroyed.Inthemaponepixel像素standsforhalfameterofland.That'saverycloselookofhowthingsareontheground.Ithelpedrescueteamsalot. WFP'sEmergencyPreparednessandResponseBranchproducedaseriesofclearmapsshowingthedamageofHaiti.ThemapshavebeenproducedinpartnershipwitharesearchanddevelopmentinstitutecalledInformationTechnologyforHumanitarianAssistanceCooperationandActionITHACA.TheorganizationwassetupyearsagoespeciallytoworkwithWFPinbringingdevelopmentsofsatellitetechnologyintoitsresponsetodisasters.Justafewyearsagothiswouldhavemeanthavingtowaitforhelicopterstooverflyareasandforhumanbeingstophysicallyseethedamage.Thesatelliteswhichoperatearoundhighaboveourheadsareofgreathelp.Theyareabletoseethroughcloudswhichishelpfulwhenweatherconditionspreventtheuseofopticalinstruments光学仪器. NowbothWFPandITHACAhaveteamsworkingaroundtheclocktomakeuseofmorenewtechnologiestohelppeopleactivelydealwithnaturaldisasters.Deathsandinjuriesfromnaturaldisasterscanbereducedifthedisastercanbepredicted.Severaldisasterpredictiontechnologieshavebeendevelopedovertheyears.WearealsoworkinghardtoprovideamoreeffectiveinstrumenttopredictnaturaldisasterssaidRiccardoRoscellipresidentofITHACA. 1AccordingtoParagraph1whatdoesWFPextremelyneedafteradisaster? A.Doctorsandvolunteers. B.Medicalandfoodsupplies. C.Theinformationaboutthedamage. D.Thedetailsaboutthecausesofthedisaster. 2WhatdoestheauthormainlywanttoshowuswhenhementionstheHaitianearthquakeinParagraph2? A.Thesatellite﹣basedmapisuseful. B.Itwasaveryseriousearthquake. C.Itcausedmanyinjuriesanddeaths. D.Thepictureofthedamageisunclear. 3Whatistheuniqueadvantageofthesatellitescomparedwithopticalinstruments? A.Theycanbeusedasthesubstitutionofhelicopters. B.Theycanreducedeathsandinjuriesfromnaturaldisasters. C.Theycanbeoperatedaroundhighaboveourheads. D.Theycanseethroughcloudsinbadweatherconditions. 4WhatcanwelearnfromRiccardoRoscelli'swordsinthelastparagraph? A.Itisnoteasyforpeopletopredictnaturaldisasters. B.Naturaldisasterscancausemoreterribleconsequences. C.Theyaretryingtofindoutabetterdisasterpredictioninstrument. D.Theyhavestudieddisasterpredictiontechnologiesforyears.
HalloweenComingOut Amanwasshotinthefaceduringabankrobbery.Thatwasthenewsaboutmefiveyearsago.FromthenonIneverlookedina1itevenscaredmyselfwhenseeingmydestroyedface.Ilivedinmyhousealonewithoutoutsidecontact.ButonenightIwasmakingan2.ItwasHalloween. Whatafittingnightformeto3!Ilongedforhumancontact.WhenmypumpkinlanternsmiledatoothywelcomeinmyfrontdoorIheardfootstepsandgiggling咯咯的笑aschildrencameclosetomyhouse. Trickortreattheycried. Myhandsstartedto4.Iopenedthedoorandgavethema5smilethroughmydamagedlipsbeneatharoughscarwheremynoseonce6. Doyouwantatrickordoyouwantatreat?Myvoicesoundedmorelikeaghost.The7expressiononthechildren'sfacessuggestedeverything. Treat!They8pickedacandyortwofrommybucketandrantothe9oftheirparents. Iclosedthedoorandpressedmybackagainstit.IfeltdizzybutI10it.Thenthebellrang.Trickortreat.a11voicecametome.IopenedthedoortofindasmallgirlwearingaShirleyTemplemask. HiShirley.Ispokequietlynotto12her.Aren'tyoubeautifultonight? ShestaredatherfeetandshookherheadNo. Yesyouare.You'reShirleyTemplethemostbeautifulgirlintheworld. Shelookedupatmeandpulledher13totheside.Seeingherdeformed变形的facemyheartmissedabeat. WellIthinkyouarebeautifuldarling.Isaidgently. Atthewordshereyesconnectedwithmine.Anuncertainhandreachedtowardmybucketandtookonepieceofcandy.Thankyou.Hervoicewasa14.Sheturnedandrantohermother.Inoddedmyheadtohermotherandgavethembotha15. Iclosedmydoorandturnedoffmygatelamp.My16lifebeganagain. ThenextmorningIheardmydoorbellring.Itriedtoignoreit17itrangagain.IwenttothedoorandcalledoutWho'sthere? It'sShirleyTempleandherMom. Iopenedthedoorinafew18andlooked.Itwasthewomanandherdaughterwithouthermask.BeforeIspokethemothersaidMygirlsaidshewantedtomeetyou.Iwatchedtearsstartto19inthemother'seyes.Thisisherfirsttimeoutsidewithouthermask. Ipulledthedooropenandthatwasalsothefirsttimeinfiveyearsformetoinvitesomeoneintomy20. 1A.mirror B.wallet C.pocket D.bank 2A.expectation B.appointment C.introduction D.exception 3A.act B.stay C.appear D.flee 4A.shake B.cross C.dance D.tap 5A.bitter B.friendly C.simple D.quiet 6A.lived B.sat C.breathed D.slept 7A.moved B.excited C.shocked D.puzzled 8A.easily B.politely C.sadly D.quickly 9A.security B.shadow C.defense D.sight 10A.finished B.promoted C.got D.did 11A.thin B.loud C.claim D.clear 12A.interrupt B.scare C.discourage D.cheat 13A.gloves B.hat C.mask D.glasses 14A.whistle B.whisper C.signal D.sigh 15A.glance B.wave C.hand D.surprise 16A.busy B.social C.meaningful D.lonely 17A.for B.so C.but D.or 18A.seconds B.efforts C.inches D.steps 19A.well B.dry C.freeze D.fix 20A.future B.story C.mind D.life.
Screamifyouwanttochargeyourphone.ThankstothewondersofscienceridersonThorpePark'snewattractionarollercoaster过山车calledTheWalkingDeadcannowpowertheirsmartphonesbyscreamingloudly.That'sbecausetherearedevicesonitthat'harvestkineticenergy'动能.Theparkconductedresearchwhichshowsthatmillennials'biggestfearistheirphonesrunningoutofbatterysothedeviceshouldprovepopular.AlloftheWalkingDead'scarriageshavebeenfittedwiththeharvestingdeviceswhichnotonlyharvesttheenergyofscreamsbutthatfromg﹣forceandvibrations振动too.Theunitsarethenremovedfromthecarriagesbystaffanddepositedintoanon﹣sitemobilechargingpoint.ThorpeParksaid'Ifthrill﹣seekersarebraveenoughtoopentheireyestheywillseeasetofLEDlightsinbloodredpoweringupasguests'screamsbecomelouderthroughoutthespine﹣tingling90﹣secondexperience.'DesignedandinstalledbyresearchersatQueenMaryUniversityLondonandtheengineeringteamatThorpeParkResortthetechnologytookthreemonthstoimplement执行fromdesigntoinstallation.Itwillbeavailableatthethemeparkforaninitialtrialperiod.Ifthisprovessuccessfulthetechnologymaybecomeapermanentfixturefortheremainderofthe2018season.ThorpeParkResort'sJohnBurtonwhocameupwiththerideconceptsaid'TheWalkingDeadTheRideis15outof10onthescarefactorscale等级soitmakessensetobeabletocombineandusethepowerofourvisitors'screamsandtheride'svibrationstohelpsolveaproblemeachandeveryoneofusfaces﹣losingthechargeonourmobileswhenwe'reonadayout.'DrJoeBriscoeSchoolofEngineeringandMaterialsScienceatQueenMaryUniversityofLondonsaid'Thisisanexcitingconceptthatwillundoubtedlybeusedmorefrequentlyinthefuture.Thesystemusesaminienergyharvestertocapturethekineticenergytransferringittoaseparateelectricalcircuitandstorageunitwhichisenoughtochargeamobilephone.'1Wecanlearnfromthetextthat.A.aphoneshouldbeputintherollercoastertobechargedB.itwasJohnBurtonwhodesignedandinstalledthedeviceC.theenergyofscreamsg﹣forceandvibrationscanbeharvestedbythedeviceD.thetrialperiodofthetechnologywilllastthreemonths2Whatdoestheunderlinedword'spine﹣tingling'meaninParagraph4?A.Unforgettableandsatisfying.B.Interestingandinspiring.C.Exhaustingbutdelightful.D.Frighteningbutexciting.3WhatisDrJoeBriscoe'sattitudetowardthefutureofthenewconcept?A.Skeptical.B.Optimistic.C.Critical.D.Neutral.4What'sthemainideaofthetext?A.Thetraditionalwayofchargingyourphoneisonthewayout.B.Anewbatteryforpoweringyourphoneisinvented.C.Visitors'screaminThorpeParkcanbeusedtochargethephone.D.ThemosteffectivewayofchargingyourphonehasbeenfoundinThorpePark.
Theideaofrobotrulersfriendsandlovershasbeenatopicofsciencefictionnovelsforyears. Butaccordingtoonemathematicalmodelofhowourbrainscreateconsciousnessemotionalmachineswillneverexist. Thisisbecausecomputerscan'thandleanyprocessthatcompletelyintegrates整合informationsotheycannotbeconsciousorfeeloneexpertsays. AmathematicalmodelforconsciousnessdevelopedbyGiulioTononiattheUniversityofWisconsin﹣Madisonsaysthattheabilitytointegrateinformationisakeyfeatureofconsciousness. Hebelievesthatintegratedinformationcan'tbebrokendownintosmallerpiecesinconsciousmindsbecausethebraincontextualizes将……融入背景information. Forexamplewhenweseearedcircleourbrainsdon'tseetheshapeasacolourlesscircleplusashapelesscolouredareaNewScientistreported.Insteadweseeitasawhole﹣aredcircleweunderstandthewiderpicture. It'seasyenoughformachinestoeditacollectionofindividualimages图象butmemoriesaremadeupofabankofintertwined相互交织的imagesandexperiencesandcannotbechangedinthesameway. Researchershaveusedmathematicstoshowthatcomputerscannothandlethecomplexprocessesneededtofitpiecesofinformationtogetherperfectly. Thereforeifconsciousnessisbasedontheintegrationoflotsofpiecesofinformationcomputerscan'tbeconsciousandcan'texperienceemotionslikehumans. ProfessorPhilMaguireoftheNationalUniversityofIrelandinMaynoothsaysthatconsciousnesscannotbecreatedinaphysicalmachineinlimitedtimeusinglimitedmemory. Itdoesn'tnecessarilymeanthatthereissomemagicgoingoninthebrainthatinvolvessomeforcesthatcan'tbeexplainedphysically.Itisjustsocomplexthatit'sbeyondourabilitiestochangeithesaid. Hisresearchmaymeanthatlonelyhumanswillnotfindlovewitharobottheyareunlikelytobemadetheirslaveseither. 1Whydoexpertsthinkemotionalmachineswon'texist? A.Machinescan'tsolveproblems. B.Machinescan'tintegrateinformation. C.Machinescan'thandleinformation. D.Machinescan'tcommunicatewithpeople. 2TheexamplementionedinParagraph6isusedtoshow. A.machinescannotfeel B.thebrainhasconsciousness C.machinescanrecognizeshapesandcolors D.thebraincancontextualizeinformation 3Itcanbelearnedfromthetextthat. A.theideaofrobotloverswon'tcometrue B.machinescaneditintertwinedimages C.robotscanfitpiecesofinformationtogetherperfectly D.computerscanexperienceemotionslikehumansoneday 4Whatwouldbethebesttitleforthetext? A.Howrobotswork B.Robotswillneverhavefeelings C.Willrobotsbecomepeople'sfriends? D.Whatwillrobotsbelikeinthefuture?
AfewyearsagomywifeandItookatriptoCostaRica.Uponarrivalwe1acarandheadedouttoourfirstdestinationwhichwasafewhoursaway.Ihada2soIfiguredI'dbeingreatcondition.About20minutesintothedriveIfoundmyselfpractically3intheunmarkedstreetsanddirtyroads.Upset.IturnedtoSiriavirtual虚拟的assistantinmyphoneforhelp. Itypedthe4toourdestinationinmyphoneandinstantlySirihad5thebestroute路线togetthereandwewereonourway. Theonly6wasthatthingsdidn'talwaysgothewayIthoughttheywould.Withthestreetsnotbeingwell7Iwouldsometimesmissaturnandheadinthe8direction.LuckilySirinevergot9withme.AnytimeImissedaturnSiriwouldsimply10andsayRecalculatingroute.11route.AndwithinafewsecondsSiriwouldhaveanewroute12togetustoourdestination. SometimesthenewroutemeantIhadto13totherightturnandsometimesshefoundadifferentroutethattookmynewlocationinto14Eventuallywemadeittoourhotel15andenjoyedsomebeautifulsceneryalongtheway. Mostpeoplemakethe16ofthinkingthatsuccessandhappinesscomefromsomeonesettingagoalandthen17straighttowardsit.The18isthatthereisnostraightpathtosuccess.Thereisn'teventhe19path.Therearemanypathsthatcangetyoutoyourgoals.Youjusthavetobe20torecalculateyourroutewhenyoumissaturnorthereissomethinginyourway. 1A.produced B.repaired C.rented D.purchased 2A.car B.phone C.compass D.map 3A.absorbed B.lost C.experienced D.free 4A.address B.approach C.receipt D.schedule 5A.polished B.discovered C.opened D.managed 6A.fear B.difference C.sympathy D.problem 7A.marked B.paved C.arranged D.expanded 8A.illegal B.new C.wrong D.potential 9A.generous B.mad C.concerned D.cautious 10A.breakdown B.cutin C.getup D.goaway 11AAbandoning B.Cancelling C.Reaching D.Changing 12A.checked B.updated C.adjusted D.planned 13A.point B.lead C.return D.apply 14A.order B.direction C.account D.place 15A.safely B.frequently C.hungrily D.gradually 16A.mistake B.excuse C.accident D.trouble 17A.accumulating B.withdrawing C.marching D.fleeing 18A.answer B.truth C.condition D.privilege 19A.first B.suitable C.accurate D.only 20A.willing B.proud C.anxious D.ambitious
今年5月份十八中九年级学生参加了中考体育模拟考试为了了解该校九年级1班同学的中考体育情况对全班学生的中考体育成绩进行了统计并绘制以下不完整的频数分布表和扇形统计图根据图表中的信息解答下列问题 1求全班学生人数和m的值． 2求扇形统计图中的E对应的扇形圆心角的度数 3该班中考体育成绩满分共有3人其中男生2人女生1人现需从这3人中随机选取2人到八年级进行经验交流请用“列表法”或“画树状图法”求出恰好选到一男一女的概率．
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