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发现正在使用的电器突然冒烟起火，首先应（ ）
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油锅起火首先应该
当现场发现带电设备起火首先应
断开电源
使用水枪灭火
打电话报警
立即启动固定灭火系统
当发现电气起火时首先应立即切断电源第六章
当发生电器火灾时首先应
货车因撞车起火时首先应该
清理现场
抢救伤员
抢救贵重货物
为了防止电器火灾首先应当了解电器火灾的原因
汽车罐车装油作业中罐车突然起火首先应
停止发油作业
用灭火器进行扑救
用灭火毯进行扑救
报119火警
正在使用的电器突然坏了冒烟你会
马上拆、修
马上切断电源，告诉大人
马上离开
浇一盆冷水上去
当打开房门闻到燃气气味时首先应迅速以防止引起火灾
烧水杯干烧冒烟时首先应采取的步骤是
拔下烧水杯
切断电源
取用最近的灭火瓶
倒入凉水
一天小明要洗澡打开了电热水器过了一会突然发现电热水器的导线冒烟并闻到了焦糊味――导线起火了此时他首先
速打119报警，等消防队来了后救火
立即用水将火扑灭
立即拉断电闸，切断电源，再将火扑灭
立即用手拉断着火的电线将火扑灭
电器起火火势不大时首先应
灭火
快速逃离现场
切断电源
如果因电器引起火灾在许可的情况下首先应怎样做
如果因电器引起火灾在许可的情况下首先应关闭电源开关切断电源; 用细土沙土四氯化碳或l2ll火火器进行
发现正在使用的电器突然冒烟起火首先应
用水浇灭
切断电源
找湿被子盖住
找灭火器灭火
正在使用的电器突然冒烟你应该怎么做
马上拆修
切断电源
赶快求救
汽车维修作业时由于电路短路引起火灾首先应切断电源
发现变电器闸箱冒烟起火怎么办
发现正在使用的电器突然冒烟起火首先应
用水浇灭
切断电源
找湿被子盖住
找灭火器灭火
当发现电气起火时首先应立即切断电源
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HowtoGettheBestHotelDeal Takingtheentirefamilyonvacationcanaddupquickly﹣﹣﹣﹣flightsrentalcargasmealssnacksandofcoursehotels.HoweverbydoingsomeresearchandusingthreelittlewordsyoucouldendupsavingalotofmoneyonaccommodationsFirstsearchhotelbookingsiteslikeTripAdvisororExpediaandcheckoutthehotelratesinyourlocationforthedatesyouwouldliketobook.Takedownallthepricesyoufindonlineforthathotel.Butevenifyoufindastealofadealoraspecialdiscountdon'tpressthebookbuttononthewebsitejustyet. Afterresearchingpricesonlineexpertssaythebestwaytogetthelowesthotelrateistocallthehoteldirectly﹣﹣﹣﹣notanyofthecustomerserviceor1﹣800numbersthatcouldbelistedasacontactnumberespeciallyforachainhotel.Thenyou'regoingtodropsomemagicwords.Awhileyoumightbetemptedtoaskforthebestdealorthelowestrateyoursecretweaponhereistousethephrasecheapestnonrefundablerate.AccordingtoexpertsatTravel+Leisurethatphrasetriggershotelstafftosearchfortheroomthatwillcostyoutheleastforyourvacation. Ifyoudoenduptryingtonegotiateabetterpricementionthenumbersyoufoundonlineandthenreducethosepricesby20percent.Apparentlyhotelspayaheftyfeetobelistedonhotelbookingsitesandthat20percentcouldactuallymeanmoremoneythantheywouldgetifyoubookedthroughoneofthem. Justdon'twaituntilthelastminutetoscoreadealbecausethatcanleadtopayingmorenotless.FredLalondefounderofthetravelserviceHoppertoldTravel+Leisurethatthebestdealsonhotelsareusuallyavailabletwotothreemonthsaheadofthevacationdatepotentiallysavingyoumorethan﹩270foraneight﹣daystay. 1WhatdoestheunderlinedpartthreelittlewordsinParagraph1referto? A.Aspecialdiscount B.Thebestdeal C.Thelowestrate D.Cheapestnonrefundablerate. 2Accordingtothepassagethepreferredwaytogetthebesthoteldealisto. A.callthetargethotelstobargainwiththestaff. B.collectandcomparethepricesfoundonline C.bookhotelsjustbeforeyourdeparturetime D.turntohotelbookingsitesforadiscount
已知函数fx＝1nx+x． 1求函数在点1f1处的切线方程 2若ax≥fx对任意的x∈[+∞恒成立求实数a的取值范围．
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在空间四边形OABC中若⊥⊥∠BOC＝且||＝||＝||＝1若EF分别是ABBC的中点H是EF上一点且EH＝EF记＝x+y+z则xyz＝
Onedayin1995alargeheavymiddle﹣agedmanrobbedtwoPittsburghbanksinbroaddaylight.Hedidn'twearamaskandhesmiledatsurveillancecamerasbeforewalkingoutofeachbank.LaterthatnightpolicearrestedasurprisedMcArthurWheeler.WhentheyshowedhimthesurveillancetapesWheelerstaredindisbelief.ButIworethejuicehemumbled.ApparentlyWheelerthoughtthatrubbinglemonjuiceonhisskinwouldmakehiminvisibletovideotapecameras.Afteralllemonjuiceisusedasinvisibleinksoaslongashedidn'tcomenearaheatsourceheshouldhavebeencompletelyinvisible. ThecasecaughttheeyeofthepsychologistDavidDunningatCornellUniversitywhoenlistedhisgraduatestudentJustinKrugertoseewhatwasgoingon.Theyreasonedthatwhilealmosteveryoneholdsfavourableviewsoftheirabilitiesinvarioussocialandintellectualfieldssomepeoplemistakenlyassesstheirabilitiesasbeingmuchhigherthantheyactuallyare.ThisillusionofconfidenceisnowcalledtheDunning﹣Krugereffectanddescribesthecognitivebiastoinflateself﹣assessment. ToinvestigatethisphenomenoninthelabDunningandKrugerdesignedsomecleverexperiments.Inonestudytheyaskedundergraduatestudentsaseriesofquestionsaboutgrammarlogicandjokesandthenaskedeachstudenttoestimatehisorherscoreoverallaswellastheirrelativerankingscomparedtotheotherstudents.Interestinglystudentswhoscoredthelowestinthesecognitivetasksalwaysoverestimatedhowwelltheydid﹣byalot.Studentswhoscoredinthebottomestimatedthattheyhadperformedbetterthantwo﹣thirdsoftheotherstudents! Sureit'stypicalforpeopletooverestimatetheirabilities.Theproblemisthatwhenpeopleareincompetentnotonlydotheyreachwrongconclusionsandmakeunfortunatechoicesbutalsotheyarerobbedoftheabilitytorealizetheirmistakes.Inasemester﹣longstudyofcollegestudentsgoodstudentscouldbetterpredicttheirperformanceonfutureexamsgivenfeedbackabouttheirscoresandrankings.Howeverthepoorestperformersshowednorecognitiondespiteclearandrepeatedfeedbackthattheyweredoingbadly.Insteadofbeingconfusedorthoughtfulabouttheirincorrectwaysincompetentpeopleinsistthattheirwaysarecorrect.AsCharlesDarwinwroteinTheDescentofMan1871Ignorancemorefrequentlybegetsconfidencethandoesknowledge. Interestinglyreallysmartpeoplealsofailtoaccuratelyself﹣assesstheirabilities.AsmuchasD﹣andF﹣gradestudentsoverestimatetheirabilitiesA﹣gradestudentsunderestimatetheirs.Thedifferenceisthatcompetentpeoplecananddoadjusttheirself﹣assessmentgivenappropriatefeedbackwhileincompetentindividualscannot. 1WhichofthefollowingstatementsabouttheDunning﹣KrugereffectisTRUE? A.Theeffectistrueforeveryoneindailylife. B.Itsuggeststhatmostpeoplelackcognitiveabilities. C.Somepeopleareoverconfidentabouttheirabilities. D.Theconclusionisdrawnbasedonaseriesofbankrobberies. 2Whatdothecollegestudents'behaviorsmentionedintheexperimentsprove? A.Feedbackplaysasignificantroleinestimatingone'sability. B.Incompetentpeoplehavearigidattitudetowardstheirchoice. C.Goodstudentscanpredicttheirfutureperformanceaccurately. D.Peoplecan'trelyontheirpreviousbehaviortomakeadjustments. 3TheunderlinedwordbegetsinParagraph4canbereplacedby. A.givesriseto B.takesadvantageof C.makesupfor D.breaksawayfrom 4Whatcanweinferfromthepassage? A.Realknowledgeisknowingtheextentofone'signorance. B.Itisdifficultforpeopletoevaluatetheirrealcompetence. C.Illusionofconfidenceisthemajorsourceofpeople'sfailure. D.Thosewithgreatabilitiesoftenhavealowopinionofthemselves.
请阅读下面文字和图表并按要求用英语写一篇150词左右的文章Chinesetourismindustryisrelativelyyoungbutveryattractive.With288billiondollarsspentworldwidein2018Chinesetourists'spendingrepresentsaquarterofglobaltourismspending.NowadaystravelingiseasierthansomeyearsagoandvisitingaforeigncountryisascommonasmovinginChina.ForthisreasonwhenChinesetouristsplantheirholidaytheyoftenhavethedilemmawhetheritisbettertomoveabroadortostayinChina.Chinahasthelargestoutbound出境的tourismmarket.Indeedmorethan71millionChinesetouriststraveledabroadin201815percentmorethanthepreviousyear.Thisphenomenonisduetodifferentfactorsthefirstonebeingrisingincomes.Themiddle﹣classhasthemeanstotraveloutsideChina.Thesecondoneisanincreaseinonlineinformationwithacontentofquality.WordofmouthandrecommendationsfromfriendsarethemostfavoredsourceofinformationofChinesetourists.Thethirdfactorwouldbefriendliervisapoliciesfromforeigngovernments.[写作内容]1.用约30个单词概括上述信息的主要内容2.结合上述信息用约120个单词发表你的观点内容包括你对'境外旅游热'持什么观点?说明你的理由至少两点若你所在城市正大力推广本地旅游业你认为应该采取哪些促进措施?[写作要求]1.写作过程中不能直接引用原文语句2.作文中不能出现真实姓名和学校名称3.不必写标题.[评分标准]内容完整语言规范语篇连贯词数适当.
Thereisa1930s﹣oldrestaurantinmyhometownthathasdonelittletoupdateitselfoverthepast80years.Thisispartofitscharmasisthewoodenphonebooththatsitsneglectedintheageofthecellphone. Ahthephonebooth.Weneeditnowmorethanever. Formeitsymbolizesthatphonecallswereonceprivateaffairseveniftheinformationbeingsharedwasnotsensitiveinanyway.Itwassimplyassumedthataphoneconversationwasmeantfortwopeopleandtwopeopleonly.Inpublicplacesthismeantturningtothephonebooth﹣aprivatechamberwhereonecouldconverseinpeacewithoutbeingoverheard. Evenathomephonecallsusedtoberegardedasprivate.Growingupinthe1960swehadonephoneinthehouse﹣fixedtothekitchenwall. AsakidIdidn'tgetormakemanycalls.Idohoweverrememberansweringthephoneaskingfortheidentityofthecallerandthenhandingthephonetomymom.She'dtakeitsayHelloMrs.FlaubertandthenonemomentpleaseassheplacedherhandoverthereceiverturnedtomeanddirectedThisisforme.Whydon'tyougooutsideandplay? Flash﹣forwardtowhatcellphoneshavedonetothisidyll.Withinthespaceofveryfewyearsprivateconversationshavebecomepublicdeclarationandbeingoverheardseemstobethepoint.Alargepartoftheproblemofcourseisthatwenowcarryourphoneswithusandthereflex反射toanswerthedeviceassoonasitringsisaresponsePavlovwouldhaveappreciated. Buttheinformationisrevealed!NotlongagoIwassittinginBoston'sSouthStationwaitingformytrain.AfterpurchasingasandwichIsatdownatatablenearamanwhowasonhiscellphone. LetmeparaphrasewhatthemanhadtosayYesthat'sright.Theredandyellowroses.ThatwillbeaVisa.Thenheproceededtorecitehiscardnumberandexpirationdatebeforesigningoff. Istaredunbelievablyatthefellow.HeglancedatmeandaskedWhat? MyresponsewasimmediateIrecitedhiscardnumberbacktohimalongwiththeexpirationdate. Thereisnomoreprivacynolongerasenseofpersonalbordersorlimitsandthecellphonehasbecomealoudspeaker. ToreturntophoneboothsWhydidtheydisappear?AndshouldyouthinkaphoneboothhasnovaluetodayIsawoneoneBaygoingfor＄4750. 1Whydoprivateconversationsturnintopublicdeclarationaccordingtothepassage? A.Phoneboothshavediedoutinmodernlife. B.Peoplelackasenseofpersonalbordersorlimits. C.Thecontentofphonecallsisnotthatsensitive. D.Itisconvenientforpeopletoreachforcellphones. 2BydescribingwhathappenedinBoston'sSouthStationtheauthorindicatesthat. A.it'sridiculoustoanswercellphonesinpublicplaces B.it'simpolitetooverhearothersansweringcellphones C.it'snecessarytokeepasafedistancefromotherswhenansweringphones D.it'sinappropriatetotouchonpersonalinformationincellphoneconversations 3Whatcanweconcludefromthepassage? A.Pavlovisinfavorofansweringcellphonesinstantly. B.Somethingseeminglyold﹣fashionedholdsitscharmtoday. C.PhoneboothsareverypopularwithconsumersontheInternet. D.Peopleusedtolackasenseoftrustandsecurityinthe1960s.
已知fx＝f-1＝若fa＝1则实数a的值为．
已知函数fx＝3x2则fx在x＝3处的导数为
RecentlyIrolledintoalocalrestauranttotryanImpossibleBurgeranall﹣plantmeat﹣likepieinventedbytheSiliconValleycompanyImpossibleFoods.It'sfamousforhavingaweirdlychewyevenbloodymeat﹣likequalityasurprisingverisimilitude逼真thathasmadeitperhapsthecountry'smostfamousburgerasNewYorkmagazinerecentlywrote.OnebiteintoitsgorgeoussmokyflavorandIwasconvinced. Thisisgoodnewsbecausethetimehascometomass﹣producefake假的meatfast.Why?Becauseinthefighttoeaseclimatechangemeatreplacementisoneofthelowest﹣hangingfruits. Meatproductionchewsuplandandletsoutmethane沼气bythekilotonaccountingforabouttwo﹣thirdsofallgreenhousegasemissionsfromagriculture.AUniversityofOxfordstudyrecentlyfoundthattokeepglobalwarmingbelow2degreesthiscenturyweneedtobeeating75percentlessbeefand90percentlessporkglobally.WithoutconcentratedchangewereallyriskgoingbeyondkeyenvironmentallimitsMarcoSpringmannoneoftheOxfordresearcherswarnsme. Dietsareculturallyenshrined神圣的sochangingthemwillbehard.Fakemeatcanhelpcamouflage掩饰thatdramatictransformationwithslightadjustment. Stilleventhemostexceptionalsubstitutesformeatfaceahugechallengeifthey'regoingtoreplace75to90percentofbeefandpork.ThefirsttasteofanImpossibleBurger﹣amomentwhenlowexpectationsworkapowerfulmagicintheproduct'sfavor﹣isonething.Buthowdoyoukeepmeat﹣eatersaskingformoreaftertheirsixthandtheir26th? Fortunatelythesciencehereisplayinganimportantrole.ImpossibleFoodsowesmuchofitsappealtoabioengineeringprocessthatturnsoutbigblood﹣redtanksofhemeacrucialmolecule分子thatgivesveggie素食主义者meatthatslightlymetallicbloodyflavorasDavidLipmanchiefscienceofficerofImpossibleFoodstellsme.Meanwhileculturedmeatcreatedbygrowingactualanimalcellsinabasinisbecomingareality.InNewYorkthescientistsatOceanHuggerFoodshaveengineeredaprocesstotransformtomatoesintomocktuna.AndoverintheNetherlandsacompanycalledTheVegetarianButcherisdevelopingaNespresso﹣styledeviceYoupourinabagofvegetableprotein蛋白质andoutpopsfakemeat.Thecompanyaimstoreleaseitintwoyears. Togettotruemassadoptionfakemeatwillneedtocompetefavorablywiththerealthingonmultiplefronts.ImpossibleFoods'goalistodrivethepriceofitsproductbelowthatofSafeway's80/20hamburgermeatatwhichpointpeoplewillsimplyvotewiththeirwallets.Thenewindustryalsowantstoimproveonanimalfleshinvariousways.Fakemeatwilloutcompetetraditionalmeatbecauseyouwon'tneedtorefrigerateitifyou'remakingitasyougoco﹣founderNikoKoffemansays.That'dgiveunmeatanenormousadvantageforenergy﹣poordevelopingregions.Plusfakemeatcouldprovidemorechoices.YoucouldhaveverysoftandtendermeatforelderlypeopleKoffemanadds.Youcouldhaveacustommeatforwhateveryouneed. Wecouldspeedthisdietaryshiftwithsmartpublicpolicytoo.Beginningin2006NewYorkCitycutthenumberofadultsconsumingoneormoresugarydrinksperdayby35percentbyrunningappealingpublicservicecampaignsandrequiringthelabelingoftheirhighcaloriecounts含量infast﹣foodrestaurants.ImaginesimilarmeasurespromotingfakemeatSavetheplanetbitebybite.Saveyourhealthtoo.Speakingofyourconscienceindustrial﹣scaleanimalfarmingisethically道德上unpleasant. Youcantelltheworldisshiftingthiswaybecausetheranchers牧场主arenervous.LastyeartheUSCattlemen'sAssociationaskedthegovernmenttodefinemeatasaproductobtaineddirectlyfromanimals.Thatanxietywhichisnodoubtcausedbysciencegoestoshowthatthisgrandshiftisn'timpossible. 1TheauthorwasconvincedbytheImpossibleBurgerbecause. A.itlookslikeatraditionalmeatburger B.itcontainsnomeatbuttasteslikemeat C.itsflavorisdifferentfromthatofnormalones D.morevegetablesareusedintheburger 2Whatdoestheauthormeanbysayinglowesthangingfruitsinparagraph2? A.Ataskthatisdifficulttofulfill. B.Anapproachthatiseconomical. C.Aproductthatisenvironment﹣friendly. D.Agoalthatiseasytoachieve. 3Theauthorismostlikelytoagreethat. A.fakemeatisworthyofinvestmentforitsgreatpotential B.fakemeatcannotchangepeople'sdietaryhabits C.adeclineinmeatconsumptioncanrelieveglobalwarming D.fakemeatwillreplacerealmeatbecauseofitslowerprice 4Fakemeathasanadvantageovertraditionalmeatinthat. A.fakemeatwillnotbenecessarilystoredinarefrigerator B.thepriceoffakemeatwillbeone﹣fourthofthetraditionalmeat's C.fakemeatwillwinovertheolderpeoplethankstoitsquality D.fakemeathasabloodyflavorthatisnotfoundintraditionalmeat 5Whatcanbeinferredfromthelastparagraph? A.TheUSgovernmentdoesn'tgiveenoughsupporttoranchers. B.Theworldwillprobablyaccepttheideaoffakemeat. C.Peopledon'tliketoeatmeatproducedbytheranchersnow. D.Thedefinitionofmeathasbeenrevisedbecauseoffakemeat. 6Whichisprobablythesuitabletitleforthepassage? A.Let'sspeedupthedietaryshift B.Let'swelcomethefakemeat C.Fakemeatortraditionalmeatmustwechoose? D.Traditionalmeatanenvironmentkiller
已知a＞b＞0则下列不等式正确的是
如图FA⊥平面ABC∠ABC＝90°EC∥FAFA＝3EC＝1AB＝2AC＝4BD⊥AC交AC于点D． Ⅰ证明FD⊥BE Ⅱ求直线BC与平面BEF所成角的正弦值．
已知向量＝x11＝410||＝则x＝•＝．
如图F是椭圆C＝1a＞b＞0的右焦点直线ABx-2y+2＝0与椭圆C相切于点A Ⅰ若a＝求b Ⅱ若||＝||＝0求椭圆C的方程．
Whileabruteforceapproachtolearningmaygetthejobdoneit'snotnecessarilythebeststudyplan.Wedugthroughscientificresearchtoidentifyfivestudymethodsthatarerecommendedbycognitivescientists.Thesestudytipsmayimprovetheefficiencyofhowyoustudyhelpingyoutolearnmoreinlesstimeandkeepitlonger. Don'tWaitUntiltheLastMinute Parentsandteachersoftenwarnthatcrammingforexamsisn'tthebestwaytogetgoodgrades.There'ssciencetobackthisup.Researchersfoundthatfinaltestresultsimprovedwhenstudyingwasspacedoutovertime.Thisspacingeffecthasbeenrepeatedlystudiedandoneresearchexperimentfounda36%improvementingradesbecauseofspacingoutstudysessions.Byspacingoutstudysessionsthere'saneural神经的processoflearningforgettingalittlebitandre﹣learning.Thesecyclesarewhatbuildstrongermemory. UsePracticeTests Usingpracticetestswhilepreparingforexamscanhelpyouimproveyourperformance.Thislearningstrategyisn'tjustaboutbecomingfamiliarwithatestingformatit'saboutreinforcingthebrain'smemory. Rememberthatre﹣readingmaterialcanrefreshyourawarenessbutitwon'thelpyoubuildthememoryrecallskillsthatcanhelpyouknowthecorrectanswerduringyourexam.Abetterwaytostudyistouseflashcardsorsamplequizzesfromyourtextbook. DoOneThingataTime Researchshowsthatmultitaskingisn'tgoodforyourmemorysowhenyou'restudyingthat'stheonlythingyoushouldbedoing.ConsideryourbrainpowersimilartoyourInternetbandwidth.Multipledownloadsatthetimewillslowthingsdown.Similarlymultitaskingcausesanincreasedcognitiveloadforyourbrainreducingyourabilitytopayattentiontowhatyou'relearning. Infactresearchersfoundthatevenminimalmultitaskinghasaneffect.Somethingassimpleaswalkingaroundatrackwhilelearningvocabularywordscauseda17%reductionintestscores. AddVariety Whileit'sagoodideatoonlystudyforonesubjectatatimescientistsfoundthatalternatingbetweensubtopicscoulddramaticallyimprovememory. Thisprocessknownasinterleavingmeansthatyou'llcyclethroughaboutthreesubtopicslearningalittlebitmoreabouteachduringeachcycle.Onceyou'vefullystudiedthissetandhaveanunderstandingofthematerialyoucanmoveontothenextsetandrepeatthepattern. TeachaFriend It'slongbeensaidthatthebestwaytolearnsomethingistoteachittosomeoneelse.KnownastheprotégéeffectthislearningtheorydatesbacktoancientRome. Thereasonthestudytechniquehaslastedsolongisthatit'seffective.Researchersfoundthatevenexplainingclassmaterialtoyourselfcouldresultinthreetimesbettertestscoresthanthoseofotherstudentsputtingyouwellahead. Fivelearningstrategiestobe1inyourstudy Passageoutline Supportingdetails Don'twaituntilthelastminute ●Thereisscientificevidenceto2thefactthatcrammingforexamsdoesnotnecessarilybringaboutgoodgrades. ●Insteadofspacingoutstudysessionsstudentstendtopreparefortheirtestsina3. Usepracticetests ●Practicetestsarenotmerelyintendedtomakestudents4withtestingformatsbutreinforcedthebrain'smemory. ●Re﹣readingmaterialcanmakeyou5ofwhatyouhavelearntwhileflashcardsorsamplequizzescanbuildmemoryrecallskills. 6multitasking Multipletaskscanreducetheabilitytofocusonwhatisbeinglearned. Involvesubtopicsinyourstudy ●Studyingforonesubjectatatimeisrecommendedbutalternatingbetweensubtopicsleadstodramatic7inmemory. ●Interleavingisalearningprocesswherestudentslearnaboutthreesubtopicsineach8. Teachafriend ●Protégéeffectisalearningtheoryinwhichstudentscan9fromteachingsomeoneelse. ●Explainingclassmaterialtooneselfmay10.
已知椭圆C1m2x2+y2＝10＜m＜1与双曲线C2n2x2-y2＝1n＞0有共同的焦点e1e2分别为C1C2的离心率则e1•e2的取值范围是
请阅读下面文字及图片并按照要求用英语写一篇150词左右的文章. SoCloseYetSoFar WhereamI?WhatamIdoing?Ifyou'reoneofmy500friendsonlineyou'llalwaysbethefirsttoknow.MyphoneandlaptopareneveroutoftouchingdistancesoI'mconstantlypostingupdatesonsocialmedia﹣whetherI'mhavingacoffeeonmywaytoschoolwatchingTV…evenwhenI'mintheshower.Ihaveanever﹣endingflowofmessagesandupdatesfromallthepeopleIassociatewithonline. Iliveinauniversitydormwithacoupleofgreatroommates.YetthetruthofthematterisIfeellonely.AfewdaysagoIwentoutforadinnerget﹣togetherwithsomefriends.Mybestfriendleftthetablefor30minutesbecausehehadtotakeacall.Somespentthedinnerbentovertheirphonestextingfriendsonlinebutignoringtheonewhosatrightinfrontofthem.Andtheextraordinarythingisnoonethoughtthiswasrudeit'sjusthowlifeisnowadays. 【写作内容】 1.用约30个单词概述上述文字所描述的现象 2.分析造成该现象的原因两至三点 3.请你给Mark提两到三条建议. 【写作要求】 1.写作过程中不能直接引用原文语句 2.作文中不能出现真实姓名和学校名称 3.不必写标题. 【评分标准】 内容完整语言规范语篇连贯词数适当.
已知P为双曲线-＝1a＞0b＞0右支上一点A为其左顶点F40为其右焦点满足|AF|＝|PF|∠PFA＝则点F到直线PA的距离为
InAHistoryofReadingtheCanadiannovelistAlbertoMangueldescribesaremarkabletransformationofhumanconsciousnesswhichtookplacearoundthe10thcenturyA.D.thearrivalofsilentreading.Humanbeingshavebeenreadingforthousandsofyearsbutinancienttimesthenormalthingwastoreadaloud.WiththearrivalofsilentreadingManguelwrites…thereaderwasatlastabletoestablishanunrestrictedrelationshipwiththebookandthewords.Thewordsnolongerneededtooccupythetimerequiredtopronouncethem.Thereader'sthoughtsinspectedthematleisuredrawingnewideasfromthemallowingcomparisonsfrommemoryorfromotherbooks. ①Toreadsilentlyistofreeyourmindtoreflecttoremembertoquestionandcompare.ThecognitivescientistMaryanneWolfcallsthisfreedomthesecretgiftoftimetothink.Athousandyearslatercriticsfearthatdigitaltechnologyhasputthisgiftindanger.TheInternet'sfloodofinformationtogetherwiththedistractionsofsocialmediathreatenstooverwhelmthespaceofreadingleavingusinwhatthejournalistNicholasCarrhascalledtheshallows.InCarr'sviewtheendlesstemptingbuzzoftheInternetendangersourverybeingOneofthegreatestdangerswefacehewritesaswegiveupcontrolovertheflowofourthoughtsandmemoriestoapowerfulelectronicsystemisaslowdamagetoourhumannessandourhumanity. ②There'snoquestionthatdigitaltechnologypresentschallengestothereadingbrain.Butseenfromahistoricalperspectivedigitalreadingandsilentreadinglooklikedifferencesofdegreeratherthanofkind.Totheextentthatdigitalreadingrepresentssomethingnewitspotentialcutsbothways.DonebadlytheInternetreducesustomindlessclickersracingnumblytothebottomofabottomlessfeedbutdonewellithasthepotentialtoexpandtheverycontemplative沉思的spacethatwehaveprizedinourselveseversincewelearnedtoreadwithoutmovingourlips. ③InthefifthcenturyB.C.Socratesworriedthatwritingwouldweakenhumanmemoryandstifle扼杀judgment.InfactasWolfnotesinher2007bookProustandtheSquidtheStoryandScienceoftheReadingBraintheoppositehappenedFacedwiththewrittenpagethereader'sbraindevelopsnewcapacities. ④TheInternetmaycauseourmindstowanderoffandyetaquicklookatthehistoryofbookssuggeststhatwehavebeenwanderingoffallalong.Whenwereadtheeyedoesnotprogresssteadilyalongthelineoftextitalternatesbetweensaccades﹣littlejumps﹣andbriefstopsnotunlikethemovementofthemouse'scursoracrossascreenofhypertext. ⑤It'struethatstudieshavefoundthatreadersgiventextonascreendoworseonrecallandcomprehensionteststhanreadersgiventhesametextonpaper.Buta2015studybytheGermaneducatorJohannesNaumannsuggeststheopposite.Hegaveagroupofhigh﹣schoolstudentsthejoboftrackingdowncertainpiecesofinformationonwebsiteshefoundthatthestudentswhoregularlydidresearchonlinewerebetteratthistaskthanstudentswhousedtheInternetmostlytosendemailchatandblog. ⑥Anewgenerationofdigitalwriterspreferstoincludeinteractivefeatures.The2014iPadnovelPrytellsthestoryofademolition爆破expertreturninghomefromthefirstGulfWar.Thestoryistoldintextphotographsvideoclipsandaudio.Itusesaninterface界面thatallowsyoutofollowtheactionandshiftbetweenlevelsofawareness.Asyoureadtextonthescreendescribingcharactersandplotyoudrawyourfingersapartandseeaphotographofthechiefcharacterhiseyesopeningontheworld.Pinchyourfingersshutandyouvisithistroubledunconsciouswordsandimagesracebyasifyouareinsidehismemory.Pryistheoppositeofashallowworkitswholeplayisbetweenthesurfaceandthedepthsofthehumanmind.Readingitisstimulating. 1InAlbertoManguel'sopinionsilentreading. A.isanabnormalthingtohumanconsciousness B.offersreaders'mindfreedomandtimetothink C.strengthensreaders'powerofmemoryandreflection D.allowsreaderstogainaninsightintobooksandwords 2Whyisdigitaltechnologyconsideredtohaveendangeredourbeing? A.Itpresentschallengestothereadingbrain. B.Itharmsourhumannessandhumanitygradually. C.Itisverylikelytoexpandourcontemplativespace. D.Itleavesourthoughtsandmemoriesoutofcontrol. 3ThesentenceThefearoftechnologyisnotnew.shouldbeplacedin. A.① B.② C.③ D.④ 4WhatcanweinferfromJohannesNaumann'sstudy? A.It'seasiertocollectinformationontheInternetthaninbooks. B.People'shabitofusingtheInternetinfluencestheirperformance. C.TheInternetisn'tsupposedtobeusedasatoolofentertainment. D.Paperreadingisbetterthanscreenreadinginimprovingcomprehension. 5The2014iPadnovelPryismentionedinthelastparagraphto. A.introducetheoccurrenceofareadingrevolution B.showthetechnologyemployedindigitalreading C.provedigitalreadingnotshallowbutattractive D.illustratetheimpactdigitalreadinghasonourlife 6Whatisprobablythebesttitleforthepassage? A.Thedeepspaceofdigitalreading B.Thetimelyarrivalofsilentreading C.Thedevelopmentoftraditionalreading D.Thepotentialdamageofelectronicbooks
已知双曲线＝1a＞0b＞0的一条渐近线方程为y＝-2x则此双曲线的离心率为
MykidssitinGee'slivingroomandcautiouslyliftantiqueChristmasornaments饰品outofawell﹣lovedcardboardbox.Geestandsbesidethemquietly1eachtreasure.ShetellsmethatsheandTombuilttheirornament2piecebypieceduringeachyear'safter﹣Christmassale.She3asweleavewiththebox.Herprecioustreasuresgatheredoveralifetimehavefoundanew4. WefirstmetTomandGeeintheearlydaysofourmarriage.Someonehadbeen5ourgarbagecanstothegarageeachgarbagedayandJimandIhad6who.Thenonedaywe7himanelderlymanwholivedacrossthestreet. Ibakedcookiesandleftthemonastooloutsidethegaragewithathank﹣younote.Whenwegothomefromworkthatdayatypedletterhad8thegift.TheletterwasfromTomandexplainedhowhehadcometowalktheneighborhoodongarbagedayreturningcansforpeoplehe9knew.Backwhenhe'dbeenfightingawarIwasn't10toseehisyoungwifeGeehadfoundherselflivingalone.Neighborshadtakenthetimetohandlehergarbagecans11shedidn'thavetoandheneverforgot.Nowhe12itforwardbydoingthesameforallofus. Afewyearsafterwe'dmovedinTom13.Wephotocopiedthat14andattachedittooneofourownforGee.Wetoldherhow15Tomhadbeentousandhowwegrievedforher.Shewrotebackandtoldusshe16talkedtoTomeveryday.WhenGeeinvitedusovertolookthroughChristmasornamentsIrealizedhowharditmustbeto17withthatboxapieceofTom. JimandIagreeto18ourtreewithGee'sornamentsthisChristmasoutoftheboxthatis19inTom'shandwriting.MaybeI'lltalktohimjustasGeestilldoes.ThankyouI'llsayforteachinguswhatit20tobeaneighbor. 1A.confirming B.explaining C.revealing D.touching 2A.shelf B.basement C.art D.collection 3A.smiles B.weeps C.sighs D.hesitates 4A.home B.destination C.function D.chance 5A.distributing B.exposing C.returning D.attaching 6A.discovered B.wondered C.foreseen D.investigated 7A.spotted B.impressed C.acknowledged D.grasped 8A.answered B.replaced C.delivered D.rewarded 9A.especially B.thoroughly C.previously D.barely 10A.willing B.voluntary C.alive D.keen 11A.so B.before C.because D.if 12A.brought B.carried C.paid D.pushed 13A.survived B.withdrew C.retired D.died 14A.note B.gift C.letter D.treasure 15A.grateful B.close C.special D.superior 16A.still B.even C.just D.ever 17A.live B.finish C.go D.part 18A.supply B.manage C.decorate D.arm 19A.drafted B.labeled C.signed D.preserved 20A.reflects B.desires C.anticipates D.means
用数学归纳法证明“1-+-+…+＝n∈N*”第一步应验证的等式是从“n＝k”到“n＝k+l”左边需增加的代数式是
已知F为抛物线y2＝4x的焦点过点F且斜率为1的直线交抛物线于AB两点设|FA|＞|FB|则＝．
若函数fx＝mx3+2x2-3x-1存在单调递增区间则实数m的值可以为
Someoftheworld'smostfamousmusiciansrecentlygatheredinParisandNewOrleanstocelebratethefirstannualInternationalJazzDay.UNESCOUnitedNationsEducationalScientificandCulturalOrganizationrecently1April30asadaytoraiseawarenessofjazzmusicitssignificanceanditspotentialasaunifying联合voice2cultures. Despitethecelebrations3intheU.S.thejazzaudiencecontinuesto4andgrowolderandthemusichasfailedtoconnectwith5generations. It'sJasonMoran'sjobtohelpchangethat.AstheKennedyCenter'sartistic6forjazzMoranhopesto7theaudienceforjazzmakethemusicmore8andpreserveitshistoryandculture. Jazzseemslikeit'snotreallyapartoftheAmerican9MorantellsNationalPublicRadio.WhatI'mhopingtoaccomplishisthatmygenerationandyoungerstartto10andunderstandthatjazzisnotblackandwhiteanymore.It'sactually11andit'sactuallydigital. Moransaysoneofthe12withjazztodayisthattheentertainmentaspectofthemusichasbeenlost.Themusiccan'tbe13todaythewayitwasin1908or1958.Ithastocontinuetomovebecausethewaytheworldworksis14saysMoran. LastyearMoranworkedonaprojectthat15FatsWaller'smusicforadancepartyjusttokindofputitbackinthemindthatWallerisdancemusic16itisconcertmusicsaysMoran.Formeit'stherecontextualization情景重构.Inmusicwheredoesthe17lie?Areweashumansgainingany18intohowwetalkaboutourselvesand19somethingasabstractasaCharlieParkerrecordgetsusintoadialogueaboutouremotionsandourthoughts?SometimeswelosesightthatthemusichasawidercontextsaysMoransoIwanttocontinuethose20. 1A.saluted B.set C.marked D.laid 2A.through B.around C.across D.outside 3A.regardless B.thus C.though D.rather 4A.expand B.boycott C.extend D.shrink 5A.younger B.smaller C.elder D.larger 6A.inventor B.adviser C.visitor D.officer 7A.widen B.strengthen C.enforce D.enrich 8A.available B.admirable C.avoidable D.accessible 9A.category B.appeal C.appetite D.recipe 10A.reconstruct B.reshape C.restore D.reconsider 11A.colorful B.meaningful C.creative D.sensitive 12A.connections B.problems C.satisfactions D.conflicts 13A.described B.revealed C.presented D.exposed 14A.transferring B.changing C.recovering D.processing 15A.managed B.arranged C.conveyed D.conducted 16A.asmuchas B.aslongas C.asfaras D.assoonas 17A.reality B.emotion C.melody D.future 18A.comprehension B.access C.appreciation D.insight 19A.why B.which C.how D.what 20A.trends B.dialogues C.messages D.contexts
We'reallusedtothelatestgenerationsofmobiletelecoms﹣sois5Gjustanotherupgrade?Farfromit﹣5Gisahugeleapforward﹣liketheshiftfromthehorseandcarttocars.Anditisn'tjustanetwork5Gwillbecomethefoundationoftheentireglobaldigitaleconomycapableofgeneratingtrillionsofpoundsofvalue. Everyoneandeveryindustrywillfeelitseffects.Comparedtotoday5Gwillbe10to20timesfasterandsupportbillionsofdigitaldeviceswithmuchgreaterreliabilityandsecurity.5GprovidestheplatformfortheInternetofThings﹣everythingfromself﹣drivingcarstoenhancedmedicalandsocialcaretoallmannerofnewindustrialandbusinessapplications.Wellestablishedonlineserviceslikemediaandentertainmentwillseesignificantimprovementssuchasultra﹣highdefinitionvideoandverylowlatency延时onlinegaming. 5Gcouplesafullfibrefixednetworkapproachwithhighcapacityhighreliabilityandlowlatencymobileplusadvancedsoftwareapproachessuchasedgecomputingandnetworkvirtualisation.Newtechniquessuchasnetworkslicingallowdifferenttypesofservicestorunatthesametimevastlyincreasingthescopeofapplicationsandservicesthatcanbesupported.Ineffectone5Gnetworkcanactasthousandsorevenbillionsofvirtualnetworkseachspecialisedforaparticulartaskordedicatedtoasinglecustomerbutallrunningononephysicalinfrastructure. Whileconsumersmaybethemostobviousbeneficiariesoffastermoreintelligentandusefulservices5Gwillalsobringenormousbenefitsandopportunitiestobusinessesbyallowingenhancementsanddifferentiatorstoexistingproductsandservicesorbyprovidingaplatformforentirelynewdigitalservices.5Gisanindustrialgame﹣changerandonethatyoucan'tignore.Withtrialsenablingtechnologyalreadyunderwayaroundtheworld5Gwillbecomeanincreasingrealitywithinthenextcoupleofyears. 5GisofsuchcriticalimportancetotheUKeconomythattheGovernmentisstronglybackingeffortstohelptheUKbecomeamarketleaderinexploitingthetechnology.IthasrecentlypublishedastrategytocreateanexcitingUK5Gworldandarrangetheactionsneededtospeeditsintroduction.Itisactivelycoordinatingeffortstoacceleratemaking5Garealityandisfundingtrialsofthetechnologyground﹣breakingapplicationsandinnovativebusinesspartnershipsacrossawiderangeofurbanandruralapplications. 1Whatcanwelearnabout5Gfromthisarticle? A.5Gwillbearegularupgradeofthelatestgenerationsofmobiletelecoms. B.5Gwillbemorereliableandsecurethantheearliergenerationsofmobiletelecoms. C.5Gwillalloweverysinglecustomertohaveonephysicalinfrastructuretorun. D.5Gwillbeontrialaroundtheworldwithinthenextcoupleofyears. 2Whatdoestheunderlinedwordbeneficiariesinparagraph4probablymean? A.Peoplewhomakecontributions. B.Peoplewhomakegains. C.Peoplewhohavecreativity. D.Peoplewhosufferlosses. 3WhatattitudedoestheUKholdtowards5G? A.Hesitant. B.Cautious. C.Concerned. D.Ambitious.
已知抛物线y2＝4x过焦点F作斜率为k1的直线交抛物线于AB两点．1若|AB|＝5求k1．2过焦点F再作斜率为k2的直线交抛物线于CD两点且MN分别是线段ABCD的中点若k1+k2＝1证明直线MN过定点．
已知向量满足||＝1||＝||•＝0．若对每一确定的||最大值和最小值分别为mn则对任意m-n的最小值是．
函数fx＝4-2cosx的最小值是取得最小值时x的取值集合是．
复数z＝1-ii为虚数单位的虚部为
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