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随机变量ξ服从正态分布N(μ,σ2),若P(ξ<2)=0.2,P(2<ξ<6)=0.6,则μ=( )
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高二下学期数学《》真题及答案
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已知随机变量X.服从正态分布N.2σ²且P.0≤X.≤2=0.3则P.X.>4=_____.
设随机变量ξ服从正态分布N34若Pξa+2则a=
4
3
2
1
设随机变量X和Y独立并且都服从正态分布Nμσ2求随机变量Z=minXY的数学期望.
已知随机变量ξ服从正态分布N.2σ2且P.ξ<4=0.8则P.0<ξ<2等于.
设随机变量ξ服从正态分布N1σ2若Pξ
0.2
0.3
0.4
0.6
设随机变量ξ服从正态分布N.29若P.ξ>c+1=P.ξ<c-1则c等于______
已知随机变量X.服从正态分布N2σ2PX≤4=0.84则PX
设随机变量ξ服从正态分布N.29若P.ξ>c+1=Pξ<c﹣1则c=.
设随机变量X服从正态分布Nμσ2σ>0Fx是X的分布函数随机变量Y=FX试求EX+Y
已知随机变量ξ服从正态分布N0σ2Pξ>2=0.023则P-2≤ξ≤2=
0.977
0.954
0.488
0.477
已知随机变量ξ服从正态分布N.2σ2P.ξ≤4=0.84则P.ξ≤0=
0.16
0.32
0.68
0.84
已知随机变量ξ服从正态分布N0σ2Pξ>2=0.023则P-2≤ξ≤2=
0.997
0.954
0.488
0.477
已知随机变量ξ服从正态分布N2σ2Pξ≤4=0.84则Pξ<0=
0.16
0.32
0.68
0.84
设随机变量ξ服从正态分布N3σ2若Pξ<2a﹣3=Pξ>a+3则实数a的值为.
设随机变量X服从正态分布Nμσ2σ>0Fx是X的分布函数随机变量Y=FX试求Y的概率密度
随机变量ξ服从正态分布N.1σ2已知P.ξ<0=0.3则P.ξ<2=
已知随机变量ξ服从正态分布N0e2若Pξ>2=0.023则P-2<ξ<2=
0.477
0.625
0.954
0.977
已知随机变量X.服从正态分布N.0σ2且P.﹣2≤X≤0=0.4则P.X.>2=
已知随机变量ξ服从正态分布N.0σ2若P.ξ>2=0.023则P.-2≤ξ≤2=__________
设随机变量X服从正态分布Nμσ2σ>0Fx是X的分布函数随机变量Y=FX试求EX2+Y2
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假如你是李华.最近美国笔友Peter发来电子邮件说他在汉语学习中遇到了困难感到非常着急.请根据下面的写作提纲给他回复一封电子邮件.内容包括 1同情他的处境2给他提出几点建议3希望他情况好转. 注意1.可以适当增加细节以使行文连贯2.词数100左右. 3.开头和结尾已给出不计入总词数 DearPeter LearningthatyouarehavingahardtimelearningChineseI'mwriting… Sincerelyyours LiHua
WhenIwasthreeyearsoldmyparentsdiscoveredIwastotallydeaf.Afterdiscussingwithdoctorstheymadeadecisiontosendmetoa1school. Iexperiencedgreat2throughoutelementaryschoolbecauseI3withmostofmyschoolworkinorderthatIcouldkeepup.Becauseofmy4IhadtoconstantlyaskeveryoneWhatdidhe/shesay?Classmatesarewarmhearted.5Iworriedthateveryonewouldsoon6repeatingeverythingbacktome.OftenIwasafraidmyclassmateswouldmakefunofmesoI7answeredanyteacher'squestion. Mrs.Jordanmy5thgradeteacherchangedmy8withasimplethreewordphrase.Onemorningsheaskedtheclassaquestion.Ireadherlipsandimmediatelyraisedmyhand.YetIdaren't9it﹣thistimeIknewtheanswer.WhenshecalledonmeIwasnervous.Despitemy10IfeltconfidentbecauseIwas11thatIhadtherightanswer.Itookadeepbreathand12answeredMrs.Jordan'squestion. Iwillnever13whathappenednext.Her14surprisedallofus.Mrs.Jordanenthusiasticallyhitthefloorwithherrightfootandranherrightfingerinafullcircleuntilitpointeddirectlyatme.Withsparkling闪闪发光的eyesandawidesmileshe15THAT'SRIGHTSTEPHEN! ForthefirsttimeinmyyounglifeIwasaninstantstar.Mypride16inmyheart.My17roselikeneverbefore.Asimplethreewordphrasedeliveredwith18enthusiasmhadtotallychangedmyyounglife. Fromthatdaymygrades19dramatically.My20amongmypeersincreasedandmyoutlookonlifedidacompleteturnabout. 1A.boarding B.normal C.special D.medical 2A.gratitude B.discrimination C.anxiety D.indifference 3A.struggled B.dealt C.trembled D.reacted 4A.curiosity B.bravery C.courage D.disability 5A.Therefore B.besides C.However D.Otherwise 6A.gettiredof B.getshyof C.getashamedof D.getskilfulat 7A.briefly B.eagerly C.narrowly D.rarely 8A.belief B.situation C.environment D.decision 9A.deny B.bear C.judge D.believe 10A.fears B.annoyance C.disadvantage D.embarrassment 11A.astonished B.pleased C.convinced D.excited 12A.nervously B.gladly C.simply D.respectfully 13A.meet B.forget C.expect D.doubt 14A.response B.answer C.abuse D.expression 15A.admitted B.nodded C.cried D.explained 16A.disappeared B.continued C.ended D.burst 17A.honesty B.satisfaction C.firmness D.confidence 18A.innocent B.little C.incredible D.natural 19A.improved B.dropped C.influenced D.slid 20A.strength B.popularity C.honor D.appreciation
StephenWiltshireisafamousartist.Hisdrawings﹣oftendrawnfrommemoryandatgreatspeed﹣aresketched素描onthespotatstreetlevel. StephenwhowasborninLondonin1974didn'tsayawordasasmallchildandfoundithardtorelatetootherpeople.AttheageoffiveStephenwassenttoQueensmillSchoolLondonwhereitsoonbecameapparentthathecommunicatedthroughthelanguageofdrawing.Histeachersencouragedhimtospeakbytakingawayhisartmaterialsforashorttimeeventuallyhesaidhisfirstwords﹣paperandpencil﹣butdidn'tlearntospeakfullyuntiltheageofnine. Stephenloveddrawingandhewasseldomtobefoundwithoutpenandpaper.Oncehetookpartinartcompetitionsnewsofhisgreattalentbegantospread.EarlyfansincludedthelatePrimeMinisterEdwardHeathwhoboughthisdrawingofSalisburyCathedralmadewhenStephenwasjusteight. ButStephencametowiderpublicattentionwhentheBBCfeaturedhimintheprogrammeTheFoolishWiseOnesin1987whenhewasintroducedbySirHughCassonapastpresidentoftheRoyalAcademyasthebestchildartistinBritain. AfterthatStephen'sreputationgrewworldwide.AsecondBBCdocumentaryin2001showedStephenflyingoverLondoninahelicopterandlatercompletingadetaileddrawingofLondonwithinthreehourswhichincluded12historiclandmarks地标性建筑and200otherstructures. In2006StephenwasrecognisedforhisservicestotheartworldwhenhewasmadeamemberoftheOrderoftheBritishEmpire.TodaywhereverStephengoespeopleareattractedbyhisoutstandingtalent. 1WhatproblemdidStephenhavewhenhewasasmallchild? A.Noschoolswantedhim. B.Noteacherslikedhim. C.Hecouldn'tspeak. D.Hecouldn'tspell. 2WhendidStephenbecomeworldfamous? A.AfterhissecondBBCdocumentary. B.AftertheprogrammeTheFoolishWiseOnes. C.AfterhemetwiththelatePrimeMinisterEdwardHeath. D.AfterSirHughCassonboughthisdrawingofSalisburyCathedral. 3WhatisspecialaboutStephen'sdrawingofLondon? A.Itwashisgreatestwork. B.Itwasdrawninahelicopter. C.Itfeaturedhistoriclandmarks. D.Itwasfinishedinashorttime. 4Thetextislikelytoappearin. A.anovel B.abiography C.anofficialreport D.ahistorypaper
已知如图在坡顶A处的同一水平面上有一座古塔BC数学兴趣小组的同学在斜坡底P处测得该塔的塔顶B的仰角为45°然后他们沿着坡度为12.4的斜坡AP攀行了26米在坡顶A处又测得该塔的塔顶B的仰角为76°.求 1坡顶A到地面PO的距离 2古塔BC的高度结果精确到1米. 参考数据sin76°≈0.97cos76°≈0.24tan76°≈4.01
Manylittlekidsdreamofchangingtheworldbuthowdoessomeoneso1makeadifferencetoaplacesobig?This5﹣year﹣oldboyfromtheUKmayhavefounda2. TobyLittleisreachingouttoeverycountrythroughletters.He's3tocontactatleastonepersonfromeachcountry﹣andgeta4.Toby'smission使命beganwitha5assignmentfromschool.HismotherSabineLittlesaid HewasaskedtoreadabookcalledALettertoNewZealandwhich6thejourneyalettertakes.7readingitheaskedMummycanIwritealettertoNewZealand?AndwhileIwasstilltryingto8howtoanswerthathesaidCanIwritealettertothe9world?Atfirstshethoughthis10fortheprojectwould11but239letterslaterTobyisstillgoingstrong.12he'swrittento187countriesandheardbackfrommanyofhiscontacts.ButToby'sprojectwon't13there.The5﹣year﹣oldalsowantstofindawaytohelpthepeoplehe's14with. Whenwestartedwritingletterswe15witheasilyaccessiblefirst﹣worldcountrieshismotheradded.Suddenlywegotan16forSomalia.WhenweresearchedthecountryTobywas17andaskedwhathecoulddotohelp.Togetherwe18acharitywhoseworkwasaccessibletochildren. TobychoseShelterBoxacharitythatprovidesforfamiliesandchildrenwhohave19everythingduetodisasters.JusttodayTobymethis20ofraising﹩950.IwanttheworldtobeabetterplaceTobysaid. 1A.noisy B.small C.lovely D.clever 2A.way B.skill C.friend D.partner 3A.careful B.proud C.satisfied D.determined 4A.result B.story C.permit D.response 5A.reading B.writing C.listening D.speaking 6A.begins B.explains C.describes D.completes 7A.Until B.After C.Before D.Despite 8A.show B.understand C.figureout D.preparefor 9A.free B.new C.other D.whole 10A.support B.concern C.enthusiasm D.sympathy 11A.fade B.spread C.return D.develop 12A.Afterall B.Sofar C.However D.Therefore 13A.end B.pass C.apply D.expand 14A.played B.stayed C.connected D.competed 15A.worked B.negotiated C.kickedoff D.caughtup 16A.idea B.deal C.question D.address 17A.sad B.excited C.happy D.scared 18A.setup B.lookedfor C.headedfor D.droppedinto 19A.requested B.provided C.recorded D.lost 20A.standard B.goal C.challenge D.match
“广场舞”近期在各地频频引发争论因其响声震天干扰了居民的正常生活从物理学的角度讲“响声震天”是指声音的大针对这种现象宜春鼓楼社区居民在跳广场舞时用无线耳麦取代大喇叭既不耽误锻炼也除去了扰民的烦恼这种减弱噪声的途径是从减弱的.
Whatcanmakeyouhappy?Aniceholidayonbeach?Maybeabigmealwithfriendsatanexpensiverestaurant?Orpossiblyspendingmoneyonapairofthelatestdesignerjeans?Allthesepleasurescostmoney.Sodoesthatmeanweneedlotsofcashtofeelgoodordoestheoldsayingmoneycan'tbuyhappinessstillprovetrue? ThissayinghasbeenputtothetestbyresearchersinCanada.Theyfoundthatwhenusedintherightwaymoneycanbringushappiness.Theydiscoveredthatwhenyouusemoneytofreeuptimebypayingsomeonetodoyourworkyouarehappier.Inanexperimentpeoplereportedhigherlifesatisfactioniftheyusedmoneytosavetimeratherthanspenditonmaterialgoodssuchasanewpairofshoes.Butsurprisinglytheresearchersfoundthatonlylessthanathirdofpeopleusedtheirmoneytobuytimeeachmonth. Inourbusylivesweareshortoftime.Peoplegetstressedoverthedailydemandsontheirtime.Psychologistssaythatstressoverlackoftimecauseslowerhappinessandcontributestoanxietyandsleeplessness.Butasincomesarerisingthereisachoicetobuytime. Thiscanbethroughhiringacleanertocleanyourhouse﹣﹣﹣givingusvaluableextrahourstodothethingswewanttodo.Andinmanyforward﹣thinkingcompaniesemployeesaregiventhechancetobuymoretimeoffworkorworkflexibly. Ineverdoubtthatbuyingmoretimemakesmefeelhappierandmorerelaxed.Butputtingtimeinthefirstplaceoverputtingmoneydoescomeataprice.Sometimesthetruthisthatyouhavelesscashtospendonthethingsyounowhavetimetodo.Thenyoumaythinkabouthowtomakeadecision. 1Howdoestheauthormainlyintroducethetopicofthetext? A.Bytellingastory. B.Byusingimagination. C.Byofferingexamples. D.Byraisingquestions. 2WhatisashockinanexperimentcarriedoutbyresearchersinCanada? A.Mostpeoplehadmuchhigherlifesatisfaction. B.Moneycouldbringrealhappinesstopeople. C.Notsomanypeoplespentmoneybuyingtime. D.Moremoneywasspentonmaterialgoods. 3Whatdoestheauthorsuggestpeopledoaboutbuyingtimeatlast? A.Shareitsbenefitswithothers. B.Consideritbeforedeciding. C.Carryitouttogainhappiness. D.Giveitupwhenlackingmoney. 4What'sthebesttitleforthetext? A.CanMoneyMakeUsHappy? B.TimeValuesMoreThanMoney. C.HappinessComesFirstinOurLife. D.ShouldWeSpendMoneyonTime?
如图在▱ABCD中AB=6BC=8以C为圆心适当长为半径画弧分别交BCCD于MN两点分别以MN为圆心以大于MN的长为半径画弧两弧在∠BCD的内部交于点P连接CP并延长交AD于E交BA的延长线于F则AE+AF的值等于.
某工厂生产一批竹编笔筒该批产品出厂价为每只4元按要求在20天内完成工人小薛第x天生产的笔筒为y只y与x满足如下关系y= 1小薛第几天生产的笔筒数量为320只 2如图设第x天生产的每只笔筒的成本是P元P与x的关系可用图中的函数图象来刻画若小薛第x天创造的利润为W元求W与x之间的函数表达式并求出第几天的利润最大最大利润是多少元
函数y=+中自变量x的取值范围是.
AlthoughtheUnitedKingdomIrelandCanadaAustraliaandNewZealandhaveEnglishasanofficiallanguagetheUnitedStatesdoesnothaveanofficiallanguage.Thisishowit'spossibletobecomeaUScitizenwithoutspeakingEnglish.CanadaalsohasFrenchasanofficiallanguagethoughitismostlyspokenintheprovinceofQuebec.BecausemanyoftheEnglishspeakerswhooriginallyinhabited居住CanadacamefromtheUSthereislittledifferenceintheAmericanandCanadiandialectsofEnglish.SimilarlyAustralianandNewZealandEnglishhavefewdifferencesexceptAustraliawasoriginallysettledasapenalcolony流放地andNewZealandwasnot.BritishcolonialismhasspreadEnglishallovertheworldanditstillholdsprestige影响力inSouthAfricaIndiaandSingaporeamongothernations.InSouthAfricaEnglishbecameanofficiallanguagealongwithAfrikaansand9Africanlanguagesinthe1996constitution__.Howeveronly3%ofthecountry's30millionpeoplearenativeEnglishspeakers.Twentypercentaredescendants后代ofDutchfarmerswhospeakAfrikaansandtherestarenativeAfricans.IndiabecameindependentfromBritainin1947andtheEnglishlanguagewassupposedtobephasedout淘汰by1965.HowevertodayEnglishandHindiaretheofficiallanguages.IndianEnglishischaracterized具有的特征bytreatingmassnounsascountnounsfrequent频繁的useofthe'isn'tit?'taguseofmorecompoundsandadifferentuseofprepositions.InSingaporeChineseMalayandIndianlanguageshaveanimpact影响ontheformofEnglishspoken.EveryoneistaughtEnglishintheschoolsystembutthereareafewdifferencesfromBritishEnglishaswell.Massnounsaretreatedascountnouns'useto'meansusuallyandnoarticles冠词areusedbeforeoccupations职业.1WhycanpeoplebecomeaUScitizenwithoutspeakingEnglish?A.DifferentlanguagesarespokenintheUS.B.TheUSdoesn'thaveanofficiallanguage.C.Theycanspeaktheirownlanguagethere.D.TheycanlearnEnglishthere.2Compared比较withAustralianEnglishtheEnglishspokenbyNewZealanders.A.isclosertoAmericanEnglishB.isakindofoldEnglishC.isverysimilarinmanywaysD.isdifferentfromBritishEnglish3WhatdoweknowaboutSouthAfrica?A.Ithas11differentofficiallanguages.B.Englishisitsonlyofficiallanguage.C.20percentofitspeoplearenativeEnglishspeakers.D.Englishisbecominglessimportantthere.4Whatcanweinferfromthelastparagraph?A.TheIndiansarepoorwithEnglishgrammar.B.SingaporeanEnglishissimilartoIndianEnglish.C.PeopleinSingaporetendto倾向于misusecountnouns.D.EnglishisarequiredsubjectinSingaporeanschools.
分式方程=1的解是
如图在平面直角坐标系xOy中抛物线y=﹣x2+x+分别交x轴于A与B点交y轴于点C点顶点为D连接AD. 1如图1P是抛物线的对称轴上一点当AP⊥AD时求P的坐标 2在1的条件下在直线AP上方对称轴右侧的抛物线上找一点Q过Q作QH⊥x轴交直线AP于H过Q作QE∥PH交对称轴于E当▱QHPE周长最大时在抛物线的对称轴上找一点使|QM﹣AM|最大并求这个最大值及此时M点的坐标. 3如图2连接BD把∠DAB沿x轴平移到∠D′A′B′在平移过程中把∠D′A′B′绕点A′旋转使∠D′A′B′的一边始终过点D点另一边交直线DB于R是否存在这样的R点使△DRA′为等腰三角形若存在求出BR的长若不存在说明理由.
如图5个完全相同的小正方体组成了一个几何体则这个几何体的主视图是
OnourwaybackhomefromChristmastoydriveIaskedTommyifhehadanythingtoshare. Idon't1anythingMomheanswered.We'resopoor. Butyou'reneversopoorthatyouhavenothingto2Isaid. ButhowcouldIhelphimunderstand3Imyselfstillcomplainedaboutthe4thingsIcouldn'tafford? Thenextdayoneofmy5handedmeaChristmasgift﹣﹣aboxofchocolates.Shehadbeen6formonths! ThankyouJoannaIsaidtryingtoholdbackthe7asIhuggedher. Ihadn'texpecteda8﹣﹣Iworkatanadulteducationcenterwherewedealwithpeoplewhostrugglefinancially. LookingatmyChristmasgiftIwonderedifithadbeenanofferingoutofa9foodbudgetandIwantedtorefuseit.10IsaidThankyou. WhenIbroughtthecandieshometo11withmyfamilyItoldthemhow12eachchocolatewasifyouthoughtofhowmuchtheunemployedwoman'sfamilymakesayear.Isaidit13understandingmuchbetterYou'reneversopoorthatyouhavenothingtogive. Perhapsthe14Icouldhelpmysonunderstandwasformetounderstandfirst.15Iwenttomybookshelfandchoseseveralofmyfavorite16tosharewiththecenter.WhenIhadthem17Ifoundmysondraggingabasketoftoyshehadplayedwithwhenyounger.Idon'twantthese18thingshesaid. HehadlearnedthewayIhad﹣﹣by19!HereIhadthoughtIwastheteacherbutastudentistheone20meYou'reneversopoorthatyouhavenothingtogive. 1A.need B.have C.hide D.purchase 2A.afford B.appreciate C.expect D.give 3A.but B.until C.when D.though 4A.expensive B.practical C.delicious D.natural 5A.colleagues B.friends C.students D.relatives 6A.outoftouch B.inpower C.incharge D.outofwork 7A.tears B.anger C.curiosity D.desires 8A.gift B.coincidence C.reward D.hug 9A.tight B.perfect C.actual D.wrong 10A.Otherwise B.Instead C.Besides D.Therefore 11A.study B.deal C.experience D.share 12A.nutritious B.precious C.tasty D.inviting 13A.later B.already C.again D.before 14A.opportunity B.time C.way D.importance 15A.Unwillingly B.Immediately C.Curiously D.Frequently 16A.Clothes B.chocolates C.colors D.novels 17A.weighed B.boxed C.stored D.repaired 18A.frightening B.cheap C.dirty D.old 19A.word B.example C.punishment D.praise 20A.remembering B.helping C.teaching D.loving
Duringthepast10yearsdomesticviolencehascaughtwiderpublicattentionthankstomoreexposureofcasesinthenewsmediaandonline.KimLeetheAmericanwifeofLiYangapopularEnglishteacherandfounderoftheCrazyEnglishpostedphotosofherswellingforeheadandbruisingkneesontheSinaWeibomicro﹣bloggingserviceinAugust.LeeaccusedherhusbandofbeatingherinfrontofoneoftheirchildrenandfiledaappealfordivorceinOctober. Itisestimatedthatabout25percentofChinesewomenhavebeenabusedbytheirhusbandsverballyandphysically.TheAll﹣ChinaWomen'sFederationandtheNationalBureauofStatisticsreleasedthefigureonOct21followinganationalsurveyof105573peopleaged18andover. WiththegrowthoflegalconsciousnessmoreandmorepeopleareawarethatChinahasaspeciallawtoprotectwomen'srightsandinterests.Howevermostofthevictimscouldnotprovetheabuseincourtduringdivorcehearingsbecauseevidenceisdifficulttoproduce.Expertssaidthatthelegalsystemdoesnotprotectthevictimseffectively.Previouslawsandregulationsconcerningdomesticviolencearedifficulttopractice. That'swhyourfederationiscallingforanationallawspeciallydevotedtocontaindomesticviolencetoclarifydefinitionsoftheoffensesidentifyresponsibilitiesofrelevantdepartmentsandensurethepowerofpunishmentofviolators违法人员.saidZhenYanvice﹣presidentoftheAll﹣ChinaWomen'sFederation. InspiteofthehardshipsKimLeemadeafirmstatementinalettershewrotetoLiYangandalsosenttotheAnti﹣DomesticViolenceNetworkofChinaLawSociety Imayfailtobringyoutojusticeandyourfamemayprotectyoufromconsequencesforyourbadactions. Iwillnotfail…inmymissiontohelpmillionsofChinesewomengainthelegalprotectionthattheydeserve.Evenifyoubeatheritisimpossibletodefeatthewomanwhonevergivesup. 1WhatcanwelearnaboutKimLeefromParagraph1? A.ShewasattackedbyherhusbandontheSinaWeibomicro﹣bloggingservice. B.ShepostedherphotosontheInternetinordertopromoteTheCrazyEnglish. C.ShewasbeatenbyherhusbandwhensheproposedadivorceappealonOctober. D.Shecouldn'tacceptthatherhusbandbeatherinoneoftheirchildren'spresence. 2Accordingtothepassagewhydoesthelegalsystemnotprotectthevictimseffectively? A.Becauseitishardtogettheviolatorsofdomesticviolencepunishedincourt. B.Becauseitiscommonandnormalforahusbandtobeathiswifewhennecessary. C.BecauseChinadoesn'thaveaspeciallawtoprotectwomen'srightsandinterests. D.Becausemostwiveslovetheirhusbandtoomuchandcanputupwitheverything. 3AccordingtoZhenYanwecaninferthat. A.ZhenYanbelievesthatwomeninChinawillhaveabrightfuture B.theAll﹣ChinaWomen'sFederationisthelargestwomen'sorganization C.there'snospeciallawdealingwithdomesticviolenceinthepresentlegalsystem D.theirorganizationisexperiencedwiththecasesconcerningdomesticviolence 4AccordingtoKimLee'slettermentionedinthepassagewecanconcludethat. A.KimLeeistryingtoensurethatherhusbandwillbepunishedbylaw. B.LiYangwillnottakehisresponsibilitybecauseheissofamous C.Awomancan'tbedefeatedbydomesticviolencebutbylove D.KimLeeisdeterminedtomakesurewomenarelegallyprotected
InthefourmonthssinceIlastpostedarticlesonmyblogI'vebeenspendingalotoftimestudyingChinese.IwantedtopasstheHSK.FromthebeginningofmyprogramtheHSKwastheendgoalofmyChineselearningthisyear.LuckilyIpasseditandnowIhaveoneandahalfmonthstogohomeandstaywithmyfamily. It'sreallyexcitingtolearnChineseinanenvironmentwhereIcanstudyveryfast.What'smoreIcanseemyownprogressindifferentways.WhenIgothereeightandahalfmonthsagoIonlyknewafewofthe150wordstestedintheHSK1.HoweveruntilnowI'vetakenandpassedthe2500wordHSK5. IrememberatimearoundJanuary.IthoughtmyChinesehadreachedthepointwhereIwascomfortableinmydaytodayconversations.Somyprogresswouldslowdowngreatly.HoweveritturnedoutthatIwastotallywrong.TheconversationsIcanhavenowfarsurpass超过theonesIwashavinginJanuary. TodayIhitalanguagelearninglandmark里程碑thatwasparticularlyexcitingformeIfinishedreadingHarryPotterandtheSorcerer'sStoneinChinese.Itmightnotseemthatexcitingbutitwasformebecauseit'sthefirstfullbookI'vereadinChinese.Andit'sthethirdlanguageI'vereadHarryPotterin.I'mespeciallyproudbecauseIspentaboutsevenmonthsreadingthefirst35pagesbutinthelastmonthandahalfImanagedtoreadabout150pages.MynextchallengeistoreadanovelwrittenbyaChineseauthorratherthanonethatI'vealreadyreadmanytimesinEnglish! HopefullyI'llbeabletokeepupmylanguagelearningprogressoverthenextmonthandahalfbecauseIknowI'llprobablyneverhaveanotheropportunitytolearnalanguagelikethis. Doyouwanttolearnanewlanguage?Ifyoudogotothecountrywherepeoplespeakitandlearnitfromthelocals. 1WhatdoweknowabouttheauthorwhenshefirstcametoChina? A.Shedidn'twanttolearnChinese. B.ShetooktheHSK1immediately. C.ShewasextremelypooratChinese. D.Shejustknew150wordstestedintheHSK1. 2WhydoestheauthorsayshewastotallywronginParagraph3? A.Becauseshedidn'treallyknowhowtolearnChinese. B.BecauseshecouldlearnbetterinaChineseenvironment. C.Becauseshewasuncomfortableinherdaytodayconversations. D.Becauseshemaderapidprogressinherdaytodayconversations. 3WhatdoestheauthorwanttoshowbymentioningreadingHarryPotter? A.Shecouldreadbooksreallyfast. B.It'sgoodtolearnthroughreading. C.ShelearnedtheChineselanguagequickly. D.TheHarryPotterbooksareworthreading. 4Whatdoestheauthor'sChineselearningexperiencemainlytellus? A.Weshouldlearnalanguagethroughtravelling. B.Learningasecondlanguageisreallyimportant. C.TheChineselanguageisnotsodifficulttolearn. D.Thelanguagelearningenvironmentisimportant.
假定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处语言错误每句中最多有两处.每处错误仅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. Sharkshadbeenaroundforaverylongtime.Sharksarefishandthereareover400typesofsharksofthatthebiggestisthegreatwhiteshark.Whentheyhavebabiesthebabiesarecallingpups.Sharkslosetheirteethlikehumansandtheydon'tjustlosetheirbabytooth.Theyloseteeththroughouttheirlives.Whenasharklosingatoothatoothfromanotherrowofteethwillmoveintoitsplace.Newteetharealwaysgrowing.Becausemostsharkseatmeatsotheyfeedotheranimals.Sharksmightlookscarybuttheyarenotusuallydangeroustopeople.Peoplearemoredangeroustosharkssincepeoplehuntsharks.Tobesafelythoughitisagoodideatoleavesharksaloneifyouseeit!
如图F为⊙O上的一点过点F作⊙O的切线与直径AC的延长线交于点D过圆上的另一点B作AO的垂线交DF的延长线于点M交⊙O于点E垂足为H连接AF交BM于点G. 1求证△MFG为等腰三角形. 2若AB∥MD求MFFGEG之间的数量关系并说明理由. 3在2的条件下若DF=6tan∠M=求AG的长.
假定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.作文中共有10处语言错误每句中最多有两处.每处错误仅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. Ialwayswantedtobegreatscientist.Ihadthesedreamsofdiscoveringanewdrugthatwouldsavethelifeofhundredsofpeople.UnfortunateIwasneververygoodatchemistryatschoolandtheteacherusedtogettingveryangrywithme.AfterawhileIdecidedIwouldbecomeaninventoranddesignedanonlyproductwhichwouldbecomeahouseholdname.Myparentswerequiteencouragedbuttoldmetobealittlemorerealistic.AfewweekslateIhadacleverideaforapenthatwouldwritewithupsidedown.Tomydisappointmentafriendofmepointedoutitwasnotanewdiscovery.
王老师给同学们演示了一个电学实验取口香糖锡纸剪成条状将锡纸条带锡的一面的一端接在电池的正极另一端接在电池的负极很快发现纸条中间处开始冒烟起火苗如图所示.这是因为锡具有性将它的两端直接接在电池的正负极就会造成.
如图a∥b点B在直线b上且AB⊥BC∠1=35°那么∠2=
There'sagoodchancesomethingyou'veboughtonlinehasbeeninthehandsofapickerfirst.Thesearetheworkersinwarehouses仓库whopickpackandshipallthosethingswe'reordering. AtAmazonandothercompaniesthey'reworkingsidebysidewithrobots.Expertssaywhiletherobotsarereplacingsomehumanworkersthemachinesaren'tquitereadytotakeovercompletely. Whenarobotfindsitsstorageunititslidesunderneathliftsitupandthendeliversittoaworker一they'recalledpickers.Onarecentdaythecomputertoldapickertograbwhatlookedlikeafantasyboard棋盘game.Thepickerfounditcanneditandplaceditontheconveyorbelt. Inatraditionalfulfillmentcenterwheretheassociatewouldwalktothedifferentitemsitcantakehourstofulfillacustomerorder.Robinsonsays. Nowwiththehelpofrobotsthattasktakesminutes一andfewerhumans. Soisthisasignwe'reenteringanewindustrialrevolution? It'sdefinitelygoingtotakeoveralotofjobs.saysKarenMyersascientistatSRIoneofSiliconValley'soldestresearchcenters. Atthesametimeshesayswe'rerunningagainstthelimitsoftechnology.TakethepickerattheAmazonfulfillmentcenter.Myerssaysthoseskillsareprovingtobeuniquelyhuman. Ourfingersareincrediblyflexibleandthecurrentgenerationofroboticoperatorsthey'regettingmuchmuchbettershesays.Butthey'rejustnotquitethereyet. There'salsotherobot'sbrain. RememberthatboardgametheAmazonworkerwaslookingfor?Shecouldbarelyseetheboxfilledintothestoragebin﹣butshecouldtellitwasaboardgame.Robotscan'tdothat. Technologistssaythatincreasinglyhumanswillworksidebysidewithrobots﹣insteadofrobotsworkingalone. AmazonsaysrobotsandhumansenabledtheTracywarehousetofulfillcustomerordersfaster.Thatmeansmorecustomersandmorehumanworkers. 1Apickerdoessometasksexcept. A.pickinggoods B.producinggoods C.spottinggoods D.packinggoods 2Withthehelpofrobotssometasksare. A.moreefficient B.lessstraight C.moredifficult D.lessprofitable 3Comparedwithrobotshumansaremore. A.powerful B.artificial C.flexible D.energetic 4Whatisthebesttitleforthetext? A.Robotsreplacinghumanscompletely. B.Theadvantagesofshoppingonline. C.Thefutureofrobots. D.Robotsandhumansworkingsidebyside.
已知方程组当m为何值时x>y
如图若二次函数y=ax2+bx+ca≠0图象的对称轴为x=1与y轴交于点C与x轴交于点A点B﹣10则 ①二次函数的最大值为a+b+c ②a﹣b+c<0 ③b2﹣4ac<0 ④当y>0时﹣1<x<3.其中正确的个数是
已知an=1﹣n=123……定义b1=a1b2=a1•a2…bn=a1•a2…•an则b2019=.
在△ABC中∠BAC=90°AC=AB=4E为边AC上一点连接BE过A作AF⊥BE于点FD是BC边上的中点连接DF点H是边AB上一点将△AFH沿HF翻折.点A落在M点若MH∥AFDF=则MH2=.
假定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处语言错误每句中最多有两处.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. DisappointingattheresultoftheexaminationIsatonthesofainsilentafterschool.MyfatherhefoundIwassounhappycometoaskmewhy.Afterlearningthereasonmyfathergavemeasmile.HesaidDon'tallowtheterriblythingsinyourlifetodiscountthepositiveones.Don'tletabaddayormonthoryeartomakeyoufeellikeyouhaveabadlifeinsteadfocusingoneverythingthat'sgoingwrongstartholdingontoallofthethingsthatisgoingright.You'llfeelbettersoon.HeardwhatmyfathersaidIfeltittheshametoactlikethatanddecidedtocheermyselfup.
一些脍炙人口的歌曲中蕴含了丰富的物理知识周杰伦的菊花台中的一句歌词这样唱道“北风乱夜未央你的影子剪不断徒留我孤单在湖面成双.”其中的“影子”是由光形成的“湖面成双”是由光形成的.
某校有35名同学参加眉山市的三苏文化知识竞赛预赛分数各不相同取前18名同学参加决赛.其中一名同学知道自己的分数后要判断自己能否进入决赛只需要知道这35名同学分数的
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