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已知O为△ABC内一点,且,,若B,O,D三点共线,则t的值为( )
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已知等差数列的前n项和为Sn且S.200=100
B.C.为平面内三点,点O.为平面外任意一点,若
,则A.
C.A.共线B.不共线
共线与否和点O.的位置有关
位置关系不能确定
若ABC三点共线O是这条直线外的一点且满足则m的值为
-1
1
2
3
已知点O.为△ABC所在平面内一点且则点O.一定为△ABC的
外心
内心
垂心
重心
已知O.A.B.是不共线的三点且1若m+n=1求证A.P.B.三点共线2若A.P.B.三点共线求证m
已知A.B.C.三点不共线对平面ABC外的任一点O.若点M.满足1判断三个向量是否共面2判断点M.是
已知
B.C.是平面上不共线的三点,O.为△ABC的外心,动点P.满足
(λ∈R.,), 则P.的轨迹一定过△ABC的 A.内心
垂心
重心
AC边的中点
对空间任意一点O.与不共线的三点A.B.C.若其中xyz∈R.则P.A.B.C.四点共面.
已知A.B.P.三点共线O.为直线外任意一点若求x+y的值.
如图△ABC中AB=AC点D.为BC上一点且AD=DC过A.B.D.三点作⊙O.AE是⊙O.的直径连
已知
B.C.是平面上不共线的三点,O.为△ABC的外心,动点P.满足
(λ∈R.), 则P.的轨迹一定过△ABC的 ( ) A.内心
垂心
重心
AC边的中点
已知
B.C.是不在同一直线上的三点,O.是平面ABC内的一定点,P.是平面ABC内的一动点,若
(λ∈[0,+∞)),则点P.的轨迹一定过△ABC的( ) A.外心
重心
内心
垂心
已知点O.为△ABC所在平面内一点且则O.一定为△ABC的
垂心
重心
外心
内心
已知点O.为D.ABC所在平面内一点且则O.一定为D.ABC的
外心
内心
垂心
重心
已知平面内O.A.B.C.四点其中A.B.C.三点共线且则x+y=________.
设P.是△ABC所在平面内的一点则
P.、A.C.三点共线
P.、A.B.三点共线
P.、B.C.三点共线
以上均不正确
已知O为△ABC内一点且若BOD三点共线则t的值为
已知等差数列{an}的前n项和为Sn若且A.B.C.三点共线该直线不过点O则S200=_______
已知O.A.B.是不共线的三点且.1若求证A.P.B.三点共线2若A.P.B.三点共线求证.
已知点O.为△ABC所在平面内一点且则点O.一定为△ABC的
外心
内心
垂心
重心
点O.是△ABC内一点且点O.到三边的距离相等∠A.=60°则∠BOC的度数为__________.
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假定你是李华你的英国朋友Henry要来中国旅行他来信希望你能给他推荐一个有特色的主题公园.请你给他回信内容包括 1.你的建议上海迪士尼乐园 2.你的理由带你进入魔幻世界遇见自己最喜欢的卡通人物体验刺激的海盗船自由落体每日上演精彩娱乐活动及表演 3.你的祝愿. 注意1.词数80左右 2.可适当增加细节以使行文连贯 3.开头和结尾已给出不计入总词数. 参考词汇海盗船pirateships DearHenry I'mhappytoreceiveyourletterandknowthatyou'recomingtoChina.______ Yours LiHua
Hisillnesscanaccountfor解释hisnotbeingheretoday.
Waystoimproveyourmemory Thedemandforwaystoimprovememoryishigherinstudentsthanitisinadults.Studentsoftencomeacrossnewknowledgeindifferentareasthattheyneedtostoreforexams.1Herearethreeeffectivewaystoimproveyourmemoryasastudent. ●2 Researchshowsthatlearningactivitiesthattakemorethantwohourswithoutabreakarelessproductivewhencomparedtothosethattakeonehouror30minutes.Studentsarelikelytorememberthingstheylearnoverashortperiodoftime.Makesureyoutakebreaksbetweenlearningsessionstohelpimproveyourmemory. ●Trytorelax Relaxingshouldbeanessentialpartofyourlearningprocess.Scientistshaveproventhatstrongerandlastingmemoriescanbeachievedwhenapersonrelaxes.3Deepbreathingisoneofthemostpopularrelaxationtechniques.Establishaquietenvironmentandfindacomfortableposition.Thengothroughadeepbreathingprocessforatleast15minutes. ●Trainthebrain Studentsshouldgivetheirbrainsaworkoutinordertoimprovetheirmemory.Attimes.thebrainneedstherightstimulationtokeepgrowinganddeveloping.Youneedtocomeupwithabrain﹣boostingactivitythatissuitableforyou.4Writeashortstoryandthentrytouseseventoninewordstodescribeit.Youcanalsodogamesandpuzzlestohelpimproveyourmemory. 5Thetechniquesdiscussedabovewillhelpyoutoimproveyourmemorysignificantly. A.Distribute分散learning. B.Enrichlearningactivities. C.Somestudentssufferwithmemoryproblems. D.Likeamusclememorycanstretchandgrowwithaworkout. E.Forinstanceyoucanpreparealistofitemsandtrytomemorizethem. F.Youneedtousedifferentrelaxationtechniquesinordertoimproveyourmemory. G.Insummaryagoodmemoryisanimportantadvantagetoanystudentwhowantstoimprovehisorhergrades.
Iwouldrather宁愿havethesmallonethanthebigone.
Manyoftheworld'sfamouscitiesareknownbysomespecialnames.ParisisknownastheCityofLight.HongKongistheWallStreetofAsia.OnesmallcityinPennsylvaniamaybethesweetestplaceonEarth.ThatistownofHersheywhichisknownastheChocolateTown.ItisnamedafterMiltonHersheythefounderofthelargestchocolatefactoryintheworld. MiltonHersheybuilthisfirstcandyfactoryintheearly1900s.AtthetimeHersheywasdevelopingatechniqueformilkchocolate.Eventuallyhesucceeded.Hersheywasalsothefirsttoproduceindividuallywrappedchocolatebars.Hisfactorygrewandproducedmoreandmoretypesofchocolate.TothisdayHershey'schocolatefactoryisthelargestintheworld.Hersheyusedhissuccesstogivebacktothecommunity.Hebuiltatownaroundthefactoryforhisemployees.HegavestreetsfunnameslikeChocolateAvenue.Hebuiltschoolsparksandshops.Thisgenerousmangavemillionsofdollarstocharity.Hebuiltanamusementparkwithridestrainsforchildrenandaswimmingpool.Overtheyearsthetowngrew.Peoplefromnearandfarcametovisitthisspecialtownwhosebeautyandfamecontinuetoattractlotsoftourists.EveryyearclosetothreemilliontouristsvisittheChocolateTown. Todayvisitorstothecitycanenjoyavarietyofattractionsandactivities.TheHersheychocolatefactoryofferstours.Visitorscanlearnallaboutchocolateandhowitismade.Agiftshopsellsallkindsofchocolateandtoysmadetolooklikechocolate.Evenifyoudon'tbuyasouvenirthereisonethingthatisimpossibletoforgetthewonderfularomaoffreshchocolateeverywhere.Inthisspecialplaceeventhestreetlightsareshapedlikechocolate. AnotherattractionistheHersheyHotel.Ithasanunusualmineralspringwhereguestscanenjoyavarietyofspecialtreatments.Thetreatmentsallhaveonethingincommonchocolate. 1WhatcanweknowaboutMiltonHershey? A.Hedislikedtocook. B.Hecaredabouthisemployees. C.Hewantedtobefamous. D.Hedidn'tpayhisemployeesverywell. 2WhatwasMiltonHersheydevelopingwhenhebuilthisfirstfactory? A.Publicstructure. B.Anamusementpark. C.Attractionsforthecommunity. D.Atechniqueformilkchocolate. 3What'sthebesttitleforthepassage? A.MiltonHershey B.World'sFamousCities C.TheChocolateTown D.PennsylvaniaChocolates
假设你叫LiHua听说你的朋友Brave在学习上遇到困难心情郁闷你写信开导他. 要点1.遇到困难是很自然的 2.振作树立目标并为之奋斗 3.多跟人交流 4.运动放松心情 5.其他. 要求1.词数100左右 2.内容完整语言流畅书写工整.开头已给出不计入总词数. DearBrave I'msorrytoknowthatyouarehavingatoughtime. Yours LiHua
7.5分Centuriesagothesecaveswereplacesofworship终把forBuddhistmonks.Todaythey'rehomesfor200poorAfghanfamiliesandoneclassroom. FereshtaAhmadiwasabletostayinschoolafterherfamilymovedtothecavesaboutadecadeago.She'snowasenioratanall﹣girlshighschoolinBamyanbutshefelttheneedtoeducatethechildrenofcavesettlers.So6yearsagoshetransformedherlivingspaceintoaclassroom. For2hourseverydaysheteaches30primaryschool﹣agekidsdifferentsubjectsincludingEnglish.Shesaysshewantstogiveanopportunitytothechildrenwhodon'thaveaccesstomainstreamschools. Cavesettlersarenodifferentfrompeoplewholiveinmodemcommunitiesorpeoplewholiveinfancyapartmentsandbuildings.Theytoocanstudycangotopublicschoolsandtakeprivatecoursessotheybuildtheirabilitiesanddevelopment. Usingherownmoneytheyoungteacheropenedasmalllibrarywith200bookstoimprovethereadingskillsofherstudents.Shehopestoexpandhercaveclassinthefuture.Myplanistochangemysmallcoursetoabigschoolandtheremustbesomeassistancefromgovernmentand/orotherorganizationssothatIcantakemyservicestothenextlevel. Thechildreninthisclassroomarehappytogetaneducationandtheyhavebigdreamsforthefuture.WestudydifferentsubjectshereforexampleDarimathEnglishdrawingandreading.Iwanttobecomeadoctorinthefutureandservemypeoplesaidoneofthestudents. Yearsofconflictandpovertyforcedthesefamiliestoseekrefuge避难所intheseancientcaveswithnobasicfacilitiesandprevioustoAhmadi'sinitiative自发性nochanceofgettinganeducationforthechildren.AfteranAfghanservicebroadcastreportaboutAhmadi'sschoolAfghanistan'sMinistryofEducationofferedtohelpherinherefforts 1WhatdoesAhmadithinkvitalforthechildren? A.Asecureincomeinthefuture. B.Theiradmissiontocollege. C.Acomfortablelivingspace. D.Theiraccesstoeducation. 2Whatcanweinferfromthelastparagraph? A.Ahmadihasbeenhonored. B.Themassmediaarepowerful C.Ahmadi'splanispromising. D.AllAfghansarelefthomeless 3WhichofthefollowingwordsbestdescribesAhmad? A.Adventurous B.Selfless C.Innocent D.Aggressive.
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AlthoughIhaveconvinced使信服himofmyhonestyIthinkhestillhassomedoubts.
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下列关于基因对性状控制的叙述错误的是
Sallyisagoodstudent.Shedoeswellinallher1subject.Youmustwonder2shecanstudysowell.Letmetellyousomethingabouthergoodstudyhabits. FirstSallyspendstwohours3studyafterschooleveryday.Andshealwaysstudiesfromseventonineonschedule.Sallyisavery4determinegirlsonothingcanstopherdoingthat. SecondifSallywantstostartstudyingfirstshewillputeverything5hasnothingtodowithherstudyingasidelikethecellphone.And6actualthereareonlybooksleftonherdesk. ThirdSallynever7leaveherproblemstillnextday.Whenshemeetssomedifficultproblemsandshecan'twork8theyoutshewillturntoothers9help.Shedoesn'twait10dothemnextday. WhatdoyouthinkofSally'sstudyhabits?Youcanhaveatry.Ihopetheywillbehelpfultoyou.
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7.5分TheUnitedStates'jobmarkethasmillionsofunfilledjobs.ManyofthoseJobsrequiretechnicalskills.Howeveremployerssaymanyofthosejobsarevacantbecausetheycannotfindpeoplewiththerightskills.Laborexpertscallthisparadoxtheskillsgap.Anumberofeffortshavebeenlaunchedtobetterunderstandandsolveit. NicholasWymanwroteabookcalledJobUHowtoFindWealthandSuccessbyDevelopingtheSkillsCompaniesActuallyNeed.Hecallstheskillsgapalabormarketmismatch﹣peoplewithoutjobsandjobswithoutpeople. IntheUnitedStatesthecostofatraditionalfour﹣yearcollegecanbeveryhigh.U.S.collegesanduniversitiesproducemanygraduateseveryyear.Yetunemploymentratesamongnewgraduatesarehigh. NicholasWymansaysacombinationoftechnicalclassesandon﹣the﹣jobtraining﹣﹣﹣anapprenticeship学徒﹣﹣﹣wouldbeabetterchoiceformanypeople.HenotesthatAnapprenticeshipiswhereyoulearnfromaspecialistyouareprovidedguidanceandyoulearninanon﹣the﹣jobenvironment.Itisvitaltogettechnicalskillsthatareofimmediatevaluetoanemployer.Anditisimportanttogettransferableskillsbecausetechnologyandthenatureoftheworkplacearechangingatafasterratethanbefore. Therearequestionsaboutthedefinitionsizeandnatureoftheskillsgapinthelaborforce.IowaStateUniversityresearchersstudiedsomeofthesequestionsrecently.Theyexaminedemploymenteducationandpopulationinformationandfoundtheevidenceofaskillsgapisweak. IowaState'sLieslEathingtonnotedthatmanypolicymakersandemployerssaythereisopportunityinmiddleskillsareaslikemachining.Yetshesaidthemostrecentrecession经济衰退hitsomeofthosejobareashard.Shesaidstudentsshouldbeonguardbecauseoureconomyreallyisn'taddingthatmanyjobsthatrequirethemiddleskills. Shesaidemployerscouldgetmorewell﹣qualifiedapplicantsiftheyofferedhigherwages.Shenotedthatgraduatesoftwo﹣yeartrainingprogramsstillgenerallymakelessmoneythangraduatesoffour﹣yearcolleges. Thequestionoffindingtherightpersonfortherightjobremainsadifficultone.TheDepartmentofLaborsays=8.7millionAmericansareunemployedandanother6.7millioncanfindonlypart﹣timework. 1Theunderlinedwordparadoxinparagraph1refersto. A.thelargenumberofunemployednewgraduates B.thedemandsemployersmakeonemployees C.peoplewithoutjobsandjobswithoutpeople D.peopledisqualifiedforthevacantpositions 2WhatwillNicholasWymanprobablyadvisenewgraduatestodotogetemployed? A.Toreceivetechnicaltraining. B.Todropthecostlycollegeeducation. C.Tovaluethejobopportunities. D.Toarmthemselveswithvariousskills 3AccordingtoLieslEathingtonwhatisthesolutiontotheskillsgap? A.Reformingthedullnessofeconomy. B.Guardingagainstrecessions. C.Updatingworkers'professionalskills. D.Raisingemployees'earnings.
假定你是学生会__李华下周你所在学校要接待来自英国的交换生.请你代表学校写一篇欢迎辞要点如下 1.表示欢迎2.介绍活动安排3.表达愿望. 注意1.词数80左右2.可适当增加细节以使行文连贯.
IgrewupinasmalltowninOhiowhereeveryoneknewamancalledBob.Uneducatedhecouldn'ttalkplainly.Andbecausehewas1andnotverysmarteveryoneteasedhim.I2hewasaneasymark. Onedayhecamewalkingby.Iwasabout12andthoughtitwouldmakemefeelgrown﹣upto3himliketheadultsdid. HeaskedhowIwasdoing.Itoldhimmyfatherwas4andthatwelackedmoney.Icouldhearmyfriends5inthebackgroundsoIwentonwiththelie.Ihadhim6socompletelythateverytimeheinquiredaboutthe7.Iwouldmakeitseemincreasinglyworrying. Iknewhemadea8bydoingoddjobs打零工soitseemed9whenheaskedmeifweneededanything.Itoldhimthatwedidn'tknowifwewould10.HerespondedYoupoorthing.Iwill11foryou. ThatnightIheardthe12rattle作响softly.ThinkingitwasthewindbeatingagainstitI13it.LaterwhenIopenedthedoortogooutsideIfoundaboxof14Iknewwhohadgiventhefood.I15thesmallboxofcannedfoodwithtearsinmyeyes.Ifelt16andwantedtoreturnthegroceries. Myfatherwouldnotletmetakethebox17.HesaiditwouldhurtBob.EachdaywhenweweretohavedinnermyfatherwouldaskWhatsidedisharewehavingfromthe18boxtoday? Itwas19formetoeatthefood.IknewBobhadgiven20.HegavethebesthehadbutIdidnotdeservethegift. 1A.ill﹣treated B.bad﹣tempered C.good﹣natured D.warm﹣hearted 2A.guessed B.predicted C.insisted D.hoped 3A.condemn B.tease C.annoy D.abuse 4A.delayed B.prohibited C.deserted D.unemployed 5A.laughing B.whispering C.cheering D.clapping 6A.absorbed B.amused C.struck D.fooled 7A.atmosphere B.situation C.money D.reason 8A.budget B.profit C.living D.fortune 9A.funny B.impossible C.practical D.moving 10A.panic B.remain C.starve D.compromise 11A.manage B.operate C.purchase D.pray 12A.window B.door C.fence D.box 13A.explored B.fastened C.ignored D.investigated 14A.groceries B.vegetables C.snacks D.fruits 15A.heldup B.lookedthrough C.checkedout D.tookover 16A.thrilled B.touched C.frustrated D.ashamed 17A.back B.away C.out D.apart 18A.money B.check C.ice D.gift 19A.horrible B.hard C.pleasant D.precious 20A.personally B.secretly C.sacrificially D.enthusiastically
SharknetsinplaceacrossAustraliaspecificallyinNewSouthWalesNSWandQueenslandtoprotectbeachgoersshouldbedroppedastheyhavecausedmoreharmthangoodastudyhasfound. Themeasureswerecarriedoutbysomegovernmentsincludingnetsandtraditionaldrumlinesandprovidedbeachgoerswithafalsesenseofsafety.Thestudyfoundtheeffectivenessifnetswasdifficulttoevaluatewhilethesignificantdamagetheycausetoothermarine海生的wildlifewasclear.Researchesdesirefornon﹣deadlysharkcontrolmeasuressuchasecobarrierssonar声呐technologyandvariousshark﹣spottingtechniques. Researcherssaidwhiletheriskcomingacrossasharkwasrareanyshark﹣relateddeathsandinjuriescaughthugepublicandmediaattention. Oneoftheargumentsinsupportofusingsharknetsisthatjustoneshark﹣relateddeathhasbeenreportedinQueenslandsincethe1960s.Similarlysincethe1930sNSWhashadonlyoneshark﹣relateddeath.Buttherehavebeenatleast13peoplekilledbysharksatbeacheswithoutnetsintheNSWnorthcoastoverthepasttwoyears. TheHumanSocietyInternational'headofcampaignsNicolaBeynonsaidthegovernmentneededtomoveawayfromoutdatedmethods.Deadlysharknetsanddrumlinesaremorethan50yearsbehindscientificandanimalwelfarestandardsfordealingwithmarinewildlifesaidBeynon. TheNSWGreens'marinespokesmanJustinFieldsaidPeopleare100timesmorelikelytodrownatthebeachthantobekilledbyasharkinAustralia.Thereforemillionsofdollarsgoingintothesharknetprogramshouldbedirectedtoobservationtowersforourlifeguardsandimprovingthebeachdevices. 1Whichofthefollowingdoresearchersfocuson? A.Beachgoers'safety. B.Theshark﹣relateddeathrate. C.Friendlysharkcontrolways. D.Advancedshark﹣spottingtechniques 2Whatisparagraph4mainlyabout? A.Shark﹣relateddeaths. B.Measurestoprotectsharks. C.Reasonsofusingsharknets. D.Dangersforbeachgoers 3WhatdoNicolaBeynonandJustinFieldhaveincommon? A.Scienceisdevelopingtoofast B.Observationtowersneedrebuilding C.Manypeoplearedrowneveryyear. D.Nosharknetsaretobeused. 4Whatcanbethebesttitleforthenext? A.Aresharknetsnecessary? B.Anewstudyonseaanimals C.Sharknetprograms D.Effectivewaysofavoidingsharks
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系的以下作文.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词符号∧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. AcharitysalewasheldinourschoolplaygroundinlastSunday.Wepreparedmanythingsmakingbyhandsuchaskitesandmodelplanes.Wealsobroughtoldtoysorsecond﹣handbookstosell.Whentheactivitystartedlotsofstudentsparticipatedinthemandchosetheirfavoriteitems.Inendwemade2000yuaninall.Wedonatethemoneytothecommunitytohelpchildrenwhocouldn'tattendschool. Ihadawonderfullyexperience.Iamproudofwhichwehavedone.Ifeveryonemakesacontributionforthecharitytheworldwillbecomemuchgoodthanitusedtobe.
假如你是李华你最近在某网站购得一部电子书阅读器Kindle却发现商品存在一些质量问题.请你给商品负责人写一封电子邮件进行投诉要点如下 1.购买时间 2.质量问题 3.你的要求. 注意 1词数80左右 2可适当增加细节以使行文连贯.
下列现象不能体现反馈调节机制的是
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Λ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. Mr.Gaolivesnexttomyhome.Heisateacher.HeteachesPEinafamousmiddleschoolwhereisoneofthekeyschoolinourcity.Hehasbeenteachingtherefortenyears.Heisverypatientonhisstudentsandhislessonsareinterestedandlively.Asaresultheishighlyappreciatedbyhisstudents.Heoftentellsthempayattentiontoourhealth.Andheasksthemtoworkoutregular.HissonGaoBowasmygoodfriendandweoftenstudytogether.SometimesMr.Gaoplaysthebasketballwithusafterschool.Insummerheoftentakesustotheswimmingpoolorteachesustoswim.
Jacquelinausedtoweighover500pounds.Andforyearsshe1towearabathingsuit. Sherealizedherlifeneededacomplete2afteranunpleasantexperienceatDollywoodwhereshegot3inaturnstile旋转式栅门.ThenJacquelinadecidedtomakeachange.Shewasgoingtogetcontrolofher4! Ofcourseitwasnoeasytask.Shedevotedyearsto5withdoctorseatingrightandexercising.And6herhardworkJacquelinalost350pounds・ YearslaterJacquelina7toMexicoforavacation.Havinglost350poundsshedecidedshewasreadytowearabathingsuitwithouta8Iwas9totakemycover﹣upoffandwalkintothepool.Istillfeltlikethatsame500poundgirl.Jacquelinaexplained. ButJacquelinawasreadytofaceherfears.10.peoplearoundhercruellypointedand11atJacquelina. InthepastIwould12theircommentstoaffectmyvacationandIprobablywouldnevergotothatpoolagain.shesaidtoherself. 13nowshe'sachangedwoman! Insteadoflettingtheirresponsebringher14.shetookadeepbreaththenchoseto15andwalkintothepool. Thatwasahuge16formeshesaid.Ihadchanged.Iwasnotthe17girlanymore. Whileshe'dlost350poundsitwasn'tjustJacquelina'sbodythathadchanged.Her18changedtoo.Cruelcommentsstill19.butsherealizedherworthhad20todowithwhatotherpeoplethought. 1A.tried B.refused C.agreed D.liked 2A.stop B.hug C.change D.mixture 3A.stuck B.lost C.buried D.punished 4A.touch B.weight C.sight D.thought 5A.arguing B.bargaining C.chatting D.consulting 6A.ratherthan B.incaseof C.becauseof D.insteadof 7A.slid B.wandered C.headed D.escaped 8A.shirt B.cover﹣up C.hat D.decoration 9A.excited B.bored C.willing D.nervous 10A.Sadly B.Hopefully C.Hurriedly D.Calmly 11A.glared B.waved C.aimed D.laughed 12A.forgive B.allow C.persuade D.direct 13A.Though B.Since C.And D.But 14A.down B.up C.forward D.out 15A.pack B.entertain C.smile D.turn 16A.moment B.failure C.comment D.gesture 17A.shy B.same C.silly D.slim 18A.appearance B.style C.figure D.mind 19A.swung B.mattered C.hurt D.helped 20A.nothing B.something C.anything D.everything
Whenpeopleseemachinesthatrespondlikehumansorcomputersthatperformamazingfeatsofstrategytheysometimesjokeaboutafutureinwhichhumanitywillneedtoacceptrobotoverlords.Butburiedinthejokeisaseedofunease.SciencefictionwritingandpopularmovieshaveshownusaboutartificialintelligenceAIthatexceedstheexpectationsofitscreatorsandescapestheircontroleventuallyoutcompetingandenslavinghumansortargetingthemforextinction灭绝.EvenintherealwordnoteveryoneisreadytowelcomeAIwithopenarms.InrecentyearsascomputerscientistshavepushedtheboundariesofwhatAIcanaccomplishleadingfiguresintechnologyandsciencehavewarmedaboutthefrighteningdangersthatartificialintelligencemayposetohumanityevensuggestingthatAIcapabilitiescoulddestroythehumanrace.ButwhyarepeoplesofrightenedabouttheideaofAI?ElonMuskisoneofthefamousvoicesthathaveraisedredflagsaboutAIInJuly2017.MusktoldattendeesatameetingoftheNationalGovernorsAssociationIhaveexposuredtotheverycutting﹣edgeAlandIthinkpeopleshouldbereallyconcernedaboutit.Ikeepsoundingthealarmbell.Butuntilpeopleseerobotsgoingdownthestreetkillingpeopletheydon'tknowhowtoreactbecauseitseemssoimpossible.'Earlierin2014MuskhadlabeledAI'ourbiggestexistentialthreat'andinAugust2017hedeclaredthathumanityfacedagreaterriskfromAIthantheterrorists.PhysicistStephenHawkingwhodiedonMarch14alsoexpressedconcernsaboutAItellingtheBBCin2014that'thedevelopmentoffullartificialintelligencecouldspelltheendofthehumanrace.1WhataretopscientistsinAIworriedabout?A.Itsabilityofimpressivefests.B.Itcontributestoomuchtomovies.C.Itmayendthehumanracesomeday.D.It'scapabilitytoburyourseedsinjokes.2Whatis'redflags'inparagraph4?A.Questions.B.WarningsC.Complaints.D.Wonders.3InStephenHawking'opinionAIcould.A.beagreatthreattohumanbeings.B.learnthehumanemotionslikefear.C.predictthefutureofthehumanrace.D.composehorribletalesintoscarystories.4Thetextisprobablytakenfromaresearchpaperin.A.TechnologyB.HealthC.Planetearth.D.Humannature.
某课题组研究不同浓度NaCl溶液对茄子幼苗光合作用的影响实验结果如表所示检测期间细胞的呼吸强度没有显著变化.请回答 注气孔导度描述气孔开放程度气孔导度越大气孔开放程度越大. 1胞间CO2进入叶绿体后与结合而被固定再被还原生成有机物. 2净光合速率可以通过测定一定时间内的释放量来计算. 3据表中指标分析NaCl浓度为0~15mmol•L﹣1气孔导度导致净光合速率降低NaCl浓度为65~165mmol•L﹣1气孔导度并不是影响净光合速率降低的主要因素依据是. 4若想进一步研究不同浓度NaCl溶液对叶片光合色素的种类和含量的影响可从各组选取等量叶片提取并用纸层析法分离色素观察比较各组色素带的写出两点.
TwoyearsagoIwasatypicalgirlwitharatherplainlife.When1toalocalvoluntaryorganizationcalledPeer﹣to﹣PeerbyaposterIhadnoideawhatthisgroupwasabout.2tolearnmoreaboutitIdecidedtoattenda3whichchangedmylife. Justlikethe4suggestseveryoneisconsideredapeerincludingregularmembersandourleaders.Thismeanswecan5ourleadersbytheirfirstnames.Wecanalsoaskourleadersforhelpin6lifesituationswhichweknowtheywillnever7!Whenitcomestoconversationsaboutawkwardtopicslikeloveweare8nottobeashamedofourselves. Thisorganization'smeetings9inourlocallibrary.Weusuallygatherandcommunicateabout10topicsconcerningoursocietyeducationequalityandsafety…Thiskindofcommunicationhelpsustomaketherightchoiceand11ourmind.Sometimeswe'vegoneoutsideinordertoparticipatein12events.Oneeventwehad13wasGiveacigarette﹣Takeacandyintendingto14smoking. Atthisorganizationwearefriendswitheachotherandarea15community.I'vealsogainedalotof16experiencebycommunicatingwithpeopleandworkingintheteam. WithtimegoingbyIhavefoundanabundanceofother17organizationssuchasGiveGoodandYouthInitiativeCenter.Allofthemhave18meagreatchancetodevelopmyownpersonalityandmakemylife19. I'msureI'llhavealotofwonderful20aboutmyyouthwithmegettingolder. 1A.invited B.transformed C.promoted D.introduced 2A.Besides B.Accidentally C.Therefore D.Luckily 3A.party B.meeting C.competition D.program 4A.name B.poster C.aim D.organization 5A.address B.assist C.inform D.avoid 6A.simple B.difficult C.familiar D.similar 7A.accept B.understand C.realize D.reject 8A.forced B.requested C.encouraged D.reminded 9A.carryon B.takeplace C.setdown D.turnup 10A.light B.rare C.hot D.plain 11A.broaden B.correct C.polish D.support 12A.powerful B.cheerful C.hopeful D.meaningful 13A.inshort B.asusual C.forexample D.ineffect 14A.criticize B.spread C.decrease D.ignore 15A.famous B.tight C.workable D.good 16A.original B.particular C.potential D.precious 17A.voluntary B.individual C.professional D.social 18A.cost B.guaranteed C.owed D.prepared 19A.irregular B.comfortable C.attractive D.unbelievable 20A.memories B.impressions C.secrets D.dreams
下列关于细胞器结构及功能的叙述正确的是
LikemanylanguagesspokenbypeopleAyapanecoisdying.Onlytwopeopleintheworldstillspeakitandtheywon'ttalktoeachother. SpokeninMexicoforcenturiesAyapanecoisoneof68survivinglanguagesinthemainlySpanish﹣speakingnation.ThetwospeakersareManuelSegoviaandIsidroVelazquez.Thoughtheyliveonly500metersfromeachotherinthevillagethetwomenseldomtalktoeachother.DanielanAmericanexpertwhoisworkingtomakeadictionaryofAyapanecosaysthetwomendon'thavealotincommonandthatSegoviacanbeactivewhileVelasqueztendstomindhisownbusinessandstayathome. WhileSegoviastillspeakstohiswifeandsoninAyapaneconeitherofthemcanmanagemorethanafewwords.Velasquezhardlyspeakshisnativetongueanymore.Danielisworkingtoprotectthelanguageindictionaryformbeforeitslastsurvivingspeakerspassaway.AccordingtoDanielAyapanecoandtheotherlanguagesbegandyingoutwiththeintroductionofpublicSpanisheducationinthemid﹣20thcentury.Fordecadeslocalchildrenweren'tallowedtospeakanythingelse.Manypeopletocitiesstartinginthe1970salsohelpedthedyingoutofnativelanguages. AyapanecoisthenamegiventothelanguageSegoviaandVelazquezcallitNuumteOotewhichmeanstruevoice.Neithermanhoweverspeaksthesamelanguage.Thedictionarywillcontaintwoversions版本ofthelanguagewhenitcomesoutlaterthisyear.Thosebehindthedictionaryaren'ttheonlyonestryingtosaveAyapaneco.TheNationalLanguageInstituteplanstoholdclassessothatSegoviaandVelasquezcanpassonwhattheyknowtochildren. Itisthoughtthatthereareabout6000languagesspokenonearthandthatabouthalfwilldisappearoverthenext100years.Let'shopethetruevoiceisn'toneofthem. 1SegoviaandVelasquezseldomtalktoeachotherinAyapanecobecausethey. A.bothdislikethelanguage B.don'tgetalongwellwitheachother C.aretoobusytotalktoeachother D.don'tsharethesameinterests 2WhicharethemainreasonswhythelanguageAyapanecostarteddyingout? a.Noteacherlikedtoteachit. b.LocalchildrenhadtospeakSpanish. c.Thesurvivingspeakersdidn'tliketouseit. d.Manyvillagerswenttoliveincities. A.ab B.ac C.bd D.bc 3HowdoestheNationalLanguageInstitutetrytosaveAyapaneco? A.WriteadictionaryofAyapaneco. B.LetAyapanecobetaughtatschool. C.IntroduceapublicAyapanecoeducation. D.AskvillagerstospeakAyapaneco. 4Fromthetextwelearnthattheauthor. A.agreesthatitisnaturalthatAyapanecoshoulddieout B.thinksDaniel'sefforttopreserveAyapanecowon'twork C.thinkshighlyofAyapanecoandwantspeopletolearnit D.hopesthatAyapanecowillnotdieoutinthefuture
7.5分IntheprocessofmygrowingupDadwashardonmewhoalwaysmadesureImademybedanddidmyhomework.Hewouldcallinadvancetomakesuretherewasnoalcoholattheparty.Igotsoangrywithhimforlayingdownthelow.IwouldscreamIhateyou!DadwouldyellbackGood!Idon'tcare!DeepdownIknewhedid. OnetimeatapartyIdranktoomuchalcoholandgotsosick.IsaidCallmydad.NextthingDadwascarryingmetothecar.IwokeupthenextmorningthinkingIwoulddefinitelybecriticized.AsexpectedIgotaroastingbutInowunderstandwhyIneeddiscipline. Dadwas29whenhegothisbigrolesinfilms.Ihadanearlystartattheageofninewitharoleina1990sTVseriesbutitwasn'tuntilIfinishedfilmstudiesthatIpursuedmycareerasanactress.LikethoseearlydaysforDadIfacedlotsofrejections.WorkinginsuchacompetitiveindustryI'vesometimesthoughtIcan'tdothisanymore. OnceafteratriptoHollywoodIreturnedtoAustraliasodepressedandspentmonthsinmybedroompaintinglisteningtoEckhartTolle'smusicandtryingtofindmyselfagain.DadsatmedownandsaidAliceIknowit'shardbutit'sallaboutpersistence. NowIgettoworkwithDadalotwhichIlove.Webothpassionateaboutactingwhichcomesfromusbeingsointerestedinpeople.Ifitweren'tforDadIwouldn'tbewhereIamtoday.He'smybiggestfanandwhenyouhavethatinyourlifeyoucangoalongway. 1WhatdoestheunderlinedphrasegotaroastinginParagraph2mean? A.gotscolded B.gotdrunk C.gotinjured D.gotstimulated 2WhichofthefollowingstatementsisWRONG? A.Itisherfatherwhohashelpedshapetheauthorwhosheis. B.Theyarebothenthusiasticaboutactingandinterestedinpeople. C.Asanactorherfather'scareertookoffsmoothlyattheverybeginning. D.Shewasbitteraboutherfatherasaschoolgirlashewastoostrictwithher. 3Whichofthefollowingbestdescribetheauthor'sfather? A.talkativebutdiligent B.strictbutcaring C.persistentandhumorous D.passionateandactive
Theletterwasnotaddressed写地址tomebutIopeneditoutofcuriosity好奇.
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