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已知等比数列{an}中,a1=3,a4=81,若数列{bn}满足bn=log3an,则数列的前n项和Sn= .
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高一下学期数学《》真题及答案
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LastweekendIwentsnowshoeingwithagroupofteachersfrommyschool.1itfeltalittlestrange﹣﹣﹣abitlikewearingflippers脚蹼2youswim!lfeltquiteclumsytostartwithanditwas3toclimboverthefallentreeswiththesnowshoes4tomyfeet.HoweverIlove5andamusedtowalkinginmountainousareas6Isoongotusedtoit.Ilovedwalkingthroughtheforestandseeingallthetreescoveredin7!Attimeswalkinguphillinthesnowwashard8whentherewererocksunderneaththesnow.Oncewereachedthe9itwasworthit!Themountainwe10wascalledLeTanetanditwasl292mhigh﹣﹣﹣that'shigherthanSnowdonthetallestmountaininWales!Theskywasabitgraybuttheviewswere11.Imanagedtogetsomegreat12﹣﹣﹣andrememberedtousemynewcamera!Aftertakinglotsofphotoswestartedgoingdown.Insomewaysgoingdownthemountainwasharderthan13.Itwasverysteep陡峭anditwaseasyto14inthesnow. Atthebottomwehadahotdrinkinacabin﹣﹣﹣itwasclearly15afterafewhoursofwalkinginthecold!Beforewewent16Iattemptedsledging雪橇whichI'dnever172before!Itwasgreatfun! TobehonestI'dreally18snowshoesasanalternativetothemorewell﹣known19sports.Besidesbeingalotcheaperthanskiingit'seasiertodoandisconsideredtobealot20! 1A.Atfirst B.Byday C.Aboveall D.Bychance 2A.unless B.when C.since D.before 3A.practical B.easy C.difficult D.enjoyable 4A.designed B.reviewed C.adjusted D.attached 5A.swimming B.skiing C.hiking D.riding 6A.and B.but C.if D.so 7A.mud B.fog C.dirt D.snow 8A.especially B.normally C.directly D.perfectly 9A.bottom B.top C.valley D.beach 10A.promoted B.climbed C.protected D.ignored 11A.excellent B.common C.similar D.universal 12A.assistance B.guides C.photos D.equipment 13A.lying B.checking C.stayingup D.goingup 14A.spread B.test C.slip D.sleep 15A.needed B.displayed C.controlled D.backwards 16A.upstairs B.home C.abroad D.changed 17A.gotten B.seen C.lost D.tried 18A.suspect B.dislike C.recommend D.quit 19A.extreme B.winter C.water D.track 20A.cheaper B.safer C.firmer D.slower
假定英语课上英语老师要求同桌之间互相修改作文请你修改你同桌的以下作文.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. 删除把多余的词用斜线\划掉. 增加在缺词处加一个漏字符号∧并在该词下面写出该加的词. 修改在错的词下划一横线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11处起不计分. Mylistoffavoritebooksarelong.IreadalotandIjustkeepfindingnewfavorites.Inmyfamilyweoftentalkaboutthebookswearereadingandpassingaroundourfavorites.Itbenefitsawholefamily. Idiscoveredhowsharefavoritebookscanhelpstrengthafriendshiplongago.WhenIwasakidmyfriendLizbecameverysickerandwasgoingtomissalotofschool.Ifillabigbagwithsomeofmyfavoritebooksforherread.Sheneverforgotthat.Todayshelivesthousandofmilesawayfrommebutshesometimese﹣mailswithmeaboutthebookssheisreading.
假定你是李华最近你要为你们学校的英文报写一篇关于中欧友好日暨中欧环保小使者活动走进欧盟学校的新闻报道. 内容要点 1.中国学生表演了武术书法气功等中国特色项目 2.欧洲学生上演了有关环保的戏剧节目 3.活动的意义. 注意 1.词数100左右开头已写好不计入总词数 2.可以适当添加细节以使行文连贯.参考词汇武术martialarts气功Qigong OntheChina﹣EuropeFriendshipDaymanyChinesestudentsandtheirEuropeanfriendsgottogetherataEU'smiddleschool..
Nobodylikesanoldpoop傻子.Developingasenseofhumorispartofbecomingamatureemotionallyhealthyindividual.Laughterisgoodforthesoulbuildsfriendshipsandrelievesstress.Itservesastheglueforsocialsituationsandasanice﹣breakerforsadnessandboredom.Ifyou'veeverbeentoldtolightenuporchilloutyoushouldsavetheblueattitudeforserioussituationsanddevelopyoursenseofhumor. Forgivetheaccidental.Asuddenfallishumorousnotbecauseweliketoseepeoplefallbutbecauseitsurprises.Fromaspilled溢出waterglassinameetingtoAuntRae'steethcomingoffintheThanksgivingturkeytheembarrassmentofaccidentscanberelievedbyhumorandahelpinghand.Aftermakingsurethatnobody'shurtforgiveaccidentswithachuckle咯咯地笑ratherthanascolding. Lookfortheunexpected.Thekidwhousedtolookatyouwithhiseyesclosedduringatesthadtheidea.Parentswhoservegreeneggsandhamtotheirchildrenongraduationdaygettheidea.Unexpectedactionslightenanatmosphereandrelaxpeople. Learntolaughwithyourkids.Mostofwhatchildrensayanddoisfunny.Helpthemlearnthataccidentsaresometimesfunnyandsometimesoccasionsforjoininginandhelpinganotherhumanbeing.Bysharinglaughsandattemptingtoexplainhumoryoudevelopyoursenseofhumoraswellashelpkidsdeveloptheirownsenseofhumor. 1Ifyou'veeverbeentoldtolightenuporchilloutitmeans. A.youarehumorous B.youareblue C.youlackhumor D.youarefunny 2AccordingtoParagraph2whenyourfriendfallsyoucan. A.laughathim B.chuckle C.scoldhim D.feelembarrassed 3Intheauthor'sopinionifyourmotherservesgreeneggsandhumtoyouonyourgraduationdaysheis. A.boring B.serious C.considerate D.humorous 4Whatisthebesttitleforthepassage? A.HowtoDevelopaSenseofHumor B.WaystoBecomeaHealthyIndividual C.TheFunctionofHumor D.ProperAttitudesTowardHumor
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Asanyonewhofreelances做自由职业knowstherearelotsofadvantagesofworkingathomealone.Buttherearedrawbackstoolikethepotentialloneliness.Nowonderco﹣workingspacesarebecomingsopopulartheypermitself﹣employedindividualstofeelliketheyarepartofallofficeenvironmentwhilemakingthemgetsomeworkdonetoo.Butrentingaco﹣workingspacedoescostmoney. NowaSwedishprojectisaimingtochangethatbyturningpeople'sunder﹣usedhomesintotemporaryco﹣workingspacesavailabletofreelancersforfree.HofficewasstartedbyfreelancersChristoferGradinFranzenandJohlineZandraaboutayearagoinStockholmwhentheyinvitedafewpeopleintotheirhomeofficetoworktogether.ItwasagreatsuccessandtheprojecthassincespreadtoanumberofcitiesinEuropeNorthandSouthAmericaAustraliaIndiaandJapan.Anyonecansignupandoffertheirhomespaceasafreeco﹣workingspaceorgofindaHofficenearthem. OnaHofficedayeveryonearrivesandstartsworkatacertainhour.After45minuteseveryonegetsuptotakeabreakstretchdoqigongoryogafor10to15minutes.Afterwardspeoplecangatheraroundagainandre﹣statetheirintentionsandgoalsfortherestoftheworkdayasawaytomotivateeachother.Mealscanbeeatentogetheratacertainhourpotluck﹣style家常饭orbybringingyourownlunch. Thisprocesscreatesanencouragingandsupportiveworkenvironment.AssomefreelancersdescribeByworkingatHofficewegiveourselvesandeachotherthegifttospendourdaysinasocialworkingenvironmentwhereweareextremelyproductivewithoutignoringourotherhumanneeds.Wealsomakesuretogiveusandeachotherwhatweneedtofeelcalmhappyinspiredandcreativeduringtheworkingday. SoHofficeisnotjustaboutsharingspaceit'salsoaboutafreeexchangeofideas.AndperhapsthebestthingisthatHofficesarefreetouse. 1Hofficewasstartedto. A.changepeople'sattitudetowork B.encouragepeopletobemoresocial C.improvepeople'sworkingconditions D.provideaco﹣workingspaceforfree 2What'sthemainideaofParagraph3? A.HowpeoplerespondtoHoffice. B.HowaHofficedayworks. C.WhatpeopleshareatHoffice. D.WhatHofficemeanstopeople. 3Somefreelancers'descriptionsofHofficesuggestthatthey. A.benefitalotfromtheworkingstyle B.worklongerthanbefore C.expectmorepeopletojointhem D.can'tbeseparatedfromeachother 4WhatdoweknowaboutHofficeaccordingtothetext? A.Itisbecomingincreasinglypopular. B.Ithasbeenaroundforquiteafewyears. C.Ithascreatedmanynewjobopportunities. D.Itissuitableforpeoplefromallwalksoflife.
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