解比例 1.25：0.25＝x：1.6 ：＝：x ＝ ：

StanfordisaworldfamousuniversityonthewestcoastoftheUS.1becausethepoorboydiedofastrangedisease. TouristsareoftensurprisedatthebeautyofStanford.Amongthegreentreesbuildingswithyellowwallsandredtopsmakeupabeautifulpicture.2.That'sbecausetheywerethefavoritesofMrs.Stanford. 3.Itstandsatthecenter.ItwasbuiltbyMrs.Stanfordtorememberherhusbandwhodevotedhimselftotheuniversity.TherestudentsandteacherscancommunicatewithGodandtheycanalso holdgreatactivitiessuchasconcertsandcelebrations. 4.Itisthelandmarkoftheuniversity.AmannamedHooverhaddonealotfortheuniversity.Thethingsheonceusedcanbeseenonthefirstfloor.Onthetopofthetowertouristscanhaveagoodlookatthewholecampus. AsoneoftheworldtopuniversitiesStanfordhasmanysubjectsthatstandamongthetoponesintheworld.5.Ifyouwanttostudycomputerinauniversityabroadmaybeitisyourbestchoice. A.Andcomputersciencehasbeenthefirstformanyyears B.ThetallestbuildinginStanfordisHooverTower C.Manytouristswonderwhyyellowandredwerechosen D.TheBigChurchisthemostimportantbuildinginStanford E.ItwasbuiltbyStanfordandhiswifeinmemoryoftheironlyson

LastyearIwas14yearsold.Ihadanenemyagirlwholikedtopointoutmyshortcomings缺点.Daybydayherlistgrew:Iwasverythin;Iwas1;Isometimesdidn'trespecttheteachersItalkedtoomuch:Iwastooproudandsoon.AtlastIcouldn'tstandit.Icriedand2tomyfather.Helistenedtomequietly.ThenheaskedAlfredarethethingsshesaystrueornot?Didn'tyoueverwonderwhatyouarereally3?Wellyounowhavethatgirl'sopinion.Goandmakealistofeverythingshe4andfindoutthepointsthataretrue.Paynoattentiontotheotherthingsyouheard. Idid5myfathertold.TomysurpriseIdiscoveredthatabouthalfthethingsweretrue.SomeofthemIcouldn'tchangelikebeingverythinbutalargenumberIcouldandsuddenlyIwantedtochange.ForthefirsttimeIgotafairlyclearpictureof6. IbroughtthelistbacktoDaddy.Herefusedtotakeit.It'sjustthecaseforyou.hesaidyouknowbetterthananyonethe7.aboutyourselfButyouhavetolearntolistennotjustcloseyourearsinangerandfeelinghurt.Whensomethingsaidaboutyouistrueyou'llfinditwillbeofgreathelptoyou.Ourworldisfullofpeoplewhothinktheyknowyourduty.Don'tshutyourearslistentothemallbuthearthefactonlyanddowhatyouknowisrightthing8. Inmylife.I'venever9abetterpieceofadvice.Thanksfortheshortcomingsthatsomeonehaspointedoutforus.Theycanmakeusknowourselvesmoreandimproveus10aswegrowup.

一列简谐横波沿x轴正方向传播t＝0时刻的波形如图所示此时波刚好传播到x＝5m处的M点从此时起经过0.1s平衡位置在x＝1.5m处的质点第一次回到平衡位置．则下列判断正确的是

Inventionsusuallymakeabigdifferencetopeople'slives.Doyouhaveanygreatinventionsathome?Dotheyhelpyoualotinyourlifeorbringyoumuchfun?Herearesomeofthemostusefulinventionsinfamiliesaccordingtoasurvey. Themosthelpfulandcreativeinventionforkidsisthereadingpen.Withthespecially﹣designedpenkidsfinditconvenientandfuntolearn.Littlekidscanlearnalotincludingstory﹣tellingpoemsandmusic.Theystartlearningbytouchingthecontentsinthebookswiththepen.Thiswaykidscanlearnbythemselves.Theyarealsogreathelpersforprimaryschoolstudentsafterschool. Moppingrobots扫地机arepopularwithpeoplewhoaretoobusytodohousework.Theyaremorepopularwithofficeladies.Theycanhelppeoplecleandirtdustandhaireasily.Withthehelpofthempeopledon'tneedtospendmuchtimeonhousework.Theycanenjoyamorerelaxinglifeafterwork. Asforoldpeopleanelectricfootbasin电动洗脚盆isthebestinvention.It'sagoodchoicetobuyoneforyourgrandparents.Itcanhelpkeeptheirbloodpressurenormalandimprovebloodcirculation循环.Thespecialbasincankeepthewaterhelpoldpeoplebecomehealthierandwarm.Sowashingfeetwithitwillmorerelaxed. 1Itisforkidstolearnwiththereadingpen. A.boring B.convenient C.difficult 2Thethreeusefulinventionsaremainlyused. A.atschool B.intheoffice C.athome 3Moppingrobotsarepopularwith. A.kids B.officeladies C.oldpeople 4Oldpeoplecankeeptheirbloodpressurenormalby. A.usingtheelectricfootbasin B.listeningtomusicwiththereadingpen C.enjoyingthemoppingmachineworking 5WhichofthefollowingsentencesisTRUE? A.Thewaterwon'tgetcoldwhentheelectricfootbasinisused. B.It'sdangerousforkidstousethereadingpenalone. C.Moppingrobotscanhelppeopleforgettheirbusylife.

把﹣30.6766.7%按从大到小的顺序填写在横线上． ＞＞＞

解比例 1.250.25＝x1.6 ＝x ＝

静止在水平面上的小车固定在刚性水平轻杆的一端杆的另一端通过小圆环套在竖直光滑的立柱上．每当小车停止运动时车上的弹簧枪就会沿垂直于轻杆的水平方向自动发射一粒弹丸然后自动压缩弹簧并装好一粒弹丸等待下次发射直至射出所有弹丸．下图为该装置的俯视图．已知未装弹丸的小车质量为M每粒弹丸的质量为m每次发射弹丸释放的弹性势能为E发射过程时间极短小车运动时受到一个与运动方向相反大小为小车对地面压力λ倍的作用力忽略所有摩擦阻力重力加速度为g． 1若小车上只装一粒弹丸求弹丸被射出时小车的速度大小 2若l问中发射弹丸后小车恰能运动一周求射出弹丸时杆对小车的拉力大小

阅读下面的文章从每题所给的ABCD四个选项中选出最佳选项 Atabout6p.m.onSaturdayaforestfirebrokeoutinavillageinMuLiLiangshan.Thelocalgovemmentactedquicklyand689peopleweresenttoputoutthefire.FiregroupswerefightingthefireonSundaywhenasuddenchangeofwinddirectioncausedahugefireball.27firefightersand3localslosttheirlives.Mostofthefirefighterswereintheirtwentiesandtwoofthemwerelessthantwentythoughseveralwereolder.TheirdeathtouchedourheartsalloverChina.Thereisreasonenoughtoregardthemasheroes.PresidentXiJinpingPremierLiKeqiangandmanyotherleaderscaredfortheheroesandexpressedcondolencetotheheroes'familiesandfriends. Weshouldrememberalltheheroesandtheirspiritbraveryshowedinfightingthefire.Astheoldsayinggoes:anationislostwithoutitsmemories.ForestfiresarecommoninspringrulestopreventfireshavecomeoutinLiangshan.Manyexpertsbelievetherearesomereasonsforforestfires.Thefirstreasonisweatherchange.Warmeranddrierweatherleadstodangerousfireconditions.Nextlighteningisanotherreason.Drygrassandtreeseasilycatchfire.Finallyhotwindsaddtothepossibilityofforestfires.Thewindspreadsafirequickly.However90%offorestfiresarecausedbyhumansaccordingtoareport.Forestfirescanburnatover900℃andreachheightsofmorethan50meters.Forestfirescanmoveatspeedsofupto23kilometersanhourburningeverything﹣treesbrushhomesevenpeopleExpertsremindpeopletobecarefulduringtheholidayofQingmingknownasTombSweepingDay.Millionsofpeopletraveltotheirhomesduringtheholidaysotherisksoffiresinmountainsarehigh. Inordertokeeptheheart﹣brokenlessoninmindweshouldstopfiresfromhappeningagain. 1AccordingtothepassagewhichofthefollowingisNOTtrue? A.Allthefirefighterswholosttheirliveswereintheirtwenties. B.About700peopleweresenttoputoutthefire. C.Asuddenchangeofwinddirectionledtoahugefireball. D.ThedeathoftheheroestouchedourheartsaroundChina. 2Allofthefollowingcancauseforestfiresexceptinthepassage. A.weatherchange B.lighteningandhotwinds C.humanbehavior D.tombSweepingDay 3Whatdoestheunderlinedsentencemeaninthispassage? A.Weshouldrememberthereasonsforforestfiresincludingtheconditionsfromnatureandhumans. B.Weshouldremembertheheroesandtheirspiritbraveryshowedinfightingthefire. C.Weshouldrememberthenumberoftheheroesthatlosttheirlivesinfightingthefire. D.WeshouldremembertobecarefulduringtheholidayofQingmingknownasTombSweepingDay. 4Whatisthecharacterofforestfiresfromthepassage? A.Forestfirescanburnatmorethan9000Candreachheightsofover50meters. B.Forestfirescanrunatspeedsofupto23kilometersanhour. C.Forestfirescanburneverything﹣treesbrushhomesevenpeople. D.BothABandC. 5Youcanprobablyfindthispassage. A.inanewsreport B.inafairybook C.inastory﹣book D.inanovel

如图所示带电小球a由绝缘细线PM和PN悬挂而处于静止状态其中PM水平地面上固定一绝缘且内壁光滑的圆弧细管道GH圆心P与a球位置重合管道底端H与水平地面相切一质量为m可视为质点的带电小球b从G端口由静止释放当小球b运动到H端时对管道壁恰好无压力重力加速度为g．在小球b由G滑到H过程中下列说法中正确的是

如图所示半径为R的绝缘光滑半圆形槽圆心为O槽内有两个质量电量都相同的带电小球A和B其中A小球固定在槽的最低点．当B小球静止时OB连线与竖直方向成θ夹角．下列能保持夹角θ不变的方法有

Hurryup!We'relate.Idon'twanttothestartofthefilm.A.catch B.get C.miss D.lose

甲数是150乙数比甲数多15%丙数比乙数少20%丙数是．

已知函数fx＝则f2＝

用递等式计算能简算的要简算．

Strawberrieslooknicebutalightpressurecanmakethemoutofshape.Nowadaystherearemanyyoungpeoplewhoarejustlikestrawberries.Theyeasilybreakdownwhentheyfacedifficulties.Theydon'tknowwhattodowhentheyareintrouble.Theyhaveacommonname﹣strawberrykids. Whyaremanystudentssoeasytobreakdown?Parentsandschoolsareamainreason.Parentsdoalmosteverythingforthemintheirdailylifewhileschoolscaremoreabouttheirgradesinsteadofdevelopingtheirpersonality个性. LiuYue13isfromFujian.Hismomhardlycriticizes批评himandhealwaysfeelsgoodabouthimself.Whenateachercriticizedhimstrictlyhefeltsurprisedandsad.Hebegantodoubthisability. Studentsshoulddosomethingtomakethemselvesmentallystrong.AnexpertsaidWhenyouareintroubledon'taskforhelptooquickly.Youshouldtrytodealwithproblemsfirstbyyourself.Ialsoadviseyoutotakeanactivepartinsportsandsocialactivities.Thatcanmakeyoumentallystrong. Growingupisnotjustahappyprocess过程.Painsalsogoalongwithit.Themostimportantthingistofacethepainsbravelyandlearnfromthem. 1Somestudentsarecalledstrawberrykidsbecausetheyallliketoeatsomefruitespeciallystrawberries. 2LiuYue'smotheroftencriticizeshim. 3Parentsdoalmosteverythingfortheirchildrenintheirdailylife. 4Accordingtothefourthparagraphstudentsshouldaskforhelpquicklywhentheyareintrouble. 5Thewriteradvisesstudentstobebraveinthefaceofpains.

一IsthatyourwatchMike? 一Noitisn't.isonthetable. A.I B.Me C.Mine

如图所示由红光和蓝光组成的一细束复色光投射到一块玻璃碎片上被分成①②两束则下列说法正确的是

Iwasboredlastnight.SoIwenttowatchthefilmTreasureIsland.I'mnota1ofpirates海盗andIdidn'twatchmanypiratemovies.IthinkthismovieisthebestoneIhaveseen.Ittookmetoaworldofpirates.Thoughtheyarepirates2theyaren'tscary.EddieIzzard3theroleofLongJohnSilverinthemovie.Ithinkheactedbest.Ihaveneverthoughtmuchofhim.Asanactorbeforebutthemoviecertainlybeatmymind.TobyRegbowhoplayedJimHawkinsperformedvery4too.Hetoldusthattherealtreasuretouswaskindnessnotthegoldontheisland.Other5alsodidagoodjob. Themoviewasreallya6.SoI'dliketo7ittoyou.I'msureyouwillloveit. 1A.fan B.writer C.kid 2A.but B.if C.不填 3A.studied B.played C.showed 4A.right B.good C.well 5A.singers B.doctors C.actors 6A.trouble B.success C.question 7A.introduce B.lead C.report

某实验小组利用如图1所示的装置对轻质弹簧的弹性势能进行探究．一轻质弹簧放置在较光滑的水平桌面上弹簧右端固定左端与一小球接触但不拴接弹簧处于原长时小球恰好在桌面边缘．向右推小球使弹簧压缩一段距离后由静止释放小球离开桌面后落到铺有白纸和复写纸的水平地面上通过测量和计算可得到弹簧被压缩后的弹性势能． ①为测得小球离开桌面时的动能Ek已知重力加速度g需要测量下列物理量中的选填选项前的字母． A．小球的质量m B．小球抛出点到落地点水平距离s C．桌面到地面的高度h D．弹簧的压缩量x ②用所选择的测量量和已知量表示EkEk＝． ③如果忽略桌面摩擦阻力的影响可认为小球离开桌面时的动能Ek等于弹簧被压缩后的弹性势能Ep．实验时测得小球质量m＝190.0g桌面到地面的高度h＝40.00cm．已知弹簧的劲度系数k＝40N/m本地重力加速度g＝9.8m/s2． 某同学根据实验数据作出弹簧的弹性势能Ep与弹簧的压缩量的二次方x2关系的图象如图2所示．在Ep﹣x2图象中设图象的斜率为β由图象可得Ep随x2变化的表达式为．根据功与能的关系弹性势能的表达式中可能包含x2这个因子分析实验结果的单位关系与图线斜率有关的物理量应是．通过寻找这个物理量与β间的数值关系可得到弹簧的弹性势能的表达式为Ep＝．

如图所示斜面的倾角为30°物块AB通过轻绳连接在弹簧测力计的两端AB重力分别为10N6N整个装置处于静止状态不计一切摩擦则弹簧测力计的读数为

一I'mtiredofcleaningthehouse. 一Sweepingrobotsmoreandmorewidelytoday.Whynotbuyone? A.areused B.wereused C.areusing D.used

Inyourlifetherewillbetimeswhenyouhavetodecidewhattodo.istheroadsignforthat.Rightorleft?Maybeit'sjustaquestionofhowtomanageyourtime﹣youshouldthinkhowyoucoulddivideyourtimebetweenstudyingandhobbies. A. B. C. D.

﹣HiShirley.Couldyoutellme? ﹣At1130tomorrowmorning. A.whenyouwillarrive  B.whenwillyouarrive  C.whereyouwillarrive

如图所示光滑水平面OB与足够长粗糙斜面BC交于B点．轻弹簧左端固定于竖直墙面用质量为m1的滑块压缩弹簧至D点然后由静止释放滑块滑块脱离弹簧后经B点滑上斜面上升到最大高度并静止在斜面上．换用相同材料质量为m2的滑块m2＞m1压缩弹簧至同一点D后重复上述过程．不计滑块经过B点时的机械能损失下列说法正确的是

一HiBob.Youdon'tlookwell.What'sthematteryou? 一Italkedtoomuchanddidn'thaveanywaterlastnight.Ihaveasorethroatnow. A.in B.of C.with

甲乙两个水果店乙水果店原有水果800千克．当甲水果店销售掉乙水果店销售掉80%后乙店剩下的水果重量与甲乙两个店剩下水果的重量总数之比为27甲店原有水果多少千克解答题写出主要解答步骤

如图所示为研究光电效应的实验装置闭合开关滑片P处于滑动变阻器中央位置当一束单色光照到此装置的碱金属表面K时电流表有示数下列说法正确的是

Youmayoftenhearsomemyths传言aboutanimals.Forexampleonedogyearequalsaboutsevenhumanyearschameleons变色龙changecolortomatchtheirenvironmentTodaylet'stalkaboutbirds.Itissaidthatifyoutouchababybirdtheparentswillcompletelyabandon抛弃it.Doyoureallybelieveit? Infactmostbirdshaveaverypoorsenseofsmellsoinmostcasesareunabletoevennoticethesmellofhumansonbabybirds.Notonlythatbutmosttypesofbirdsaren'tsoquicktoabandontheiryoungwhentheysensedanger.Sometypeswillevendotheirbesttoprotecttheiryoungwhentheyareindanger. Indeedinveryfewknowncasesparentbirdssometimesabandonedtheirnestsfromsomethingtouchingtheiryoungjustbecausetheynoticeditbysightnotsmell.Whenthishappenstheparentbirdsusuallywon'tcareotherthantobealittlemorecarefulthannormal.Sometimestheymaytemporarily暂时地abandonthenestinordertobetterwatchwhateverdisturbedtheirnestcomesback. What'smoreinmostcasesevenifthenestisdestroyedbywindorsomethingtothateffectyoucouldcreateanewoneandputallthebabybirdsbackinitandwhentheparentscamebacktheywouldn'tcaretheirbabybirdswereinadifferentnestsolongasyouputthenewnestnearwheretheoldonewassotheycanfindit. 1Whichofthefollowingistrue? A.Birdshaveaverygoodsenseofsmell. B.Ababybirdwilldiesoonifitistouchedbysomeone. C.Whateverdisturbedthenestwillnevercomeback. D.Somebirdswillprotecttheirbabieswhentheyareindanger. 2WhatdoestheunderlinedworditinParagraph3referto? A.Theirnest. B.Theirbaby. C.Somebirdsabandoningtheirnests. D.Somethingtouchingtheiryoung. 3Theparentbirdsifwemakeanewnestforbabybirdstotaketheplaceoftheoldone. A.willnevercomeback B.willworryabouttheirbabies C.won'tmind D.willtaketheirbabiesaway 4Whichofthefollowingshowsthestructure结构ofthepassage? ①＝Paragraph1第一段②＝Paragraph2 5Whatisthebesttitleofthispassage? A.BirdTruth B.BabyBirds C.BirdNests D.BirdSmell

氢原子的能级图如图所示现让光子能量为E的一束光照射到大量处于基态的氢原子上氢原子能发出3种不同频率的光那么入射光光子的能量E为eV．若某种金属的逸出功为3.00eV则用上述原子发出的三种光照射该金属产生的光电子的最大初动能的最大值为eV．

图1是甲乙两个长方体容器的截面示意图乙容器中立放有一圆柱体铁块．把甲容器中的水匀速注入乙容器8分钟后甲容器的水全部注入乙容器中图2表示乙容器水深的变化情况． 1从图2中可以看出乙容器中初始水深为厘米甲容器向乙容器注水分钟时水面高度和铁块高度同样高． 2已知甲容器的底面积是40平方厘米乙容器的底面积是27平方厘米铁块的底面积是12平方厘米甲容器中水深多少厘米

比48多的数是的比60少20．

﹣didtherainstormcome? ﹣Whileweaphysicslessonyesterday. A.When;havehad B.While;arehaving  C.When;werehaving D.While;have

下列说法中正确的是

某工程队修一段长720米的公路已经修了8天每天修60米如果余下的3天修完平均每天要修多少米

如图是一个边长为厘米的正方形把这个正方形平均分成三份那么其中一份的面积应该是．

Manyenvironmentalgroupsarewarningthatoceansoftheworldareingreatdanger.Inthepast50yearsthenumberofwaterwithzerooxygen氧气intheopenoceanhasincreasedmorethanfourtimes.Inthenearcoastwaterbodiesincludingtherivermouthandseaslow﹣oxygenareashaveincreasedmorethan10timessince1950.ScientistsdiscoverthatoxygencontinuesdroppingeveroutsidethesezonesastheEarthwarms.Tostopthedroptheworldneedstocontrolinbothclimatechangeandnutrient养分pollution. Oxygenisamusttolifeintheoceans.ThedropinoceanoxygenisamongthemostseriouseffectsofhumanactivitiesontheEarth'senvironment. Thisisthefirsttimeforthescientiststotakesuchadeeplookatthecausesresultsandsolutionstolowoxygenworldwideinboththeopenoceanandthenearcoastwaters.AbouthalfoftheoxygenonEarthcomesfromtheocean.Howevermixedeffectsofnutrientloadingandclimatechangearegreatlyincreasingthenumberandsizeofdeadzonesintheopenoceanandthenearcoastwaterswhereoxygenistoolowtosupportmostsealife. Intheareastraditionallycalleddeadzones.likethoseinChesapeakeBayandtheGulfofMexicooxygendropstolevelssolowthatmanyanimalshavetroubleinbreathinganddie.Asfishesrunawayfromthesezonestheirlivingareasbecomesmallerandsmaller.Buttheproblemgoesfarbeyonddeadzones.Evensmalleroxygendropscanholdupthegrowthinanimalsandleadtodiseaseorevendeath.Lowoxygenalsocancausethereleaseofdangerouschemicals.Althoughafewanimalscangrowwellindeadzonesoverallbiodiversity多样性falls. 1Howtostopthedropofoceanoxygeninthearticle? A.Bycontrollinginbothclimatechangeandnutrientpollutionaroundtheworld. B.Bytakingadeeplookatthecausesresultsandsolutionstolowoxygenworldwide. C.Byrunningawayfromthesezonesforthelivingareasbecomesmallerandsmaller. D.Bycuttingdownthenumberofanimalsintheoceans. 2Whyarethesewaterscalleddeadzonesfromthearticle? A.Becausetheoxygenintheseareasistoolowformostsealifetolive. B.Becausenutrientloadingandclimatechangearegreatlyincreasing. C.Becausetherearenoanimalslivingintheseareas. D.Becauselowoxygenalsocancausethereleaseofdangerouschemicals. 3WhichofthefollowingstatementsisTRUEaccordingtothearticle? A.Onlyafewanimalslivingintheseaneedoxygen. B.Climatechangecanhelpcutdownthedeadzones. C.Fishesgrowfasterandbetterinlowoxygenareas. D.Humanactivitieshavemanyseriouseffectsonoceanenvironment.

如图所示为研究光电效应的实验装置闭合开关滑片P处于滑动变阻器中央位置当一束单色光照到此装置的碱金属表面K时电流表有示数下列说法正确的是

高速公路的ETC电子收费系统如图所示ETC通道的长度是识别区起点到自动栏杆的水平距离．某人驾驶汽车以6m/s的速度匀速进入识别区ETC天线用了0.3s的时间识别车载电子标签识别完成后发出滴的一声司机发现自动栏杆没有抬起于是采取制动刹车汽车刚好紧贴栏杆停下．已知司机的反应时间为0.7s刹车的加速度大小为5m/s2则该ETC通道的长度约为

完形填空 Atadarknight.amancametoalonelyvillage.Whenhewalkedslowly.ayellowlightsuddenly1attheendoftheroad.Itcamefroma2whichwascarriedbyaman.Avillagernearhimsaid.HereBlindSuncomes. Blind?themansaid.That'stoo3.Ablindmanhasnoideaofdayandnight.cannot4thebeautyofnature.orevendoesn'tknowwhatthelightis.Wasn'thefunnytocarryalantern? Asthelanternwascomingnear.theyellowlightmovedgraduallytotheman.Themanasked.5.mayIaskyouwhetheryou'rereallyblind? Theblindmananswered.Yes.themomentIsteppedintotheworld.Ican'tsee6. Themanasked.Inthatcase.7doyoucarryalantern?Theblindmansmiled.Atnightallthepeoplewithoutlightarejustasblind8me.soIlightalantern. Themansaid.Isee.youlightforothers. Butthemansaid.No.Idoitfor9. Foryourself?Butthereisno10todothat.themanfeltsurprisedagain. Theblindmanexplained.Wereyoueverknockedbyothers11thedark? Themannodded.Yes.sometimes. Themansaidproudly.Believeitornot.I12knockedanyone.AlthoughI'mblind.Icarrythelantern.notonlylightforothers.butletothersseeme.13theywon'tknockme. Afterhearingthat.themanwaslostinthought Infact.everyonehasalampinhimself.lightitactivelynotonlyforothers.butalsoforyourself!﹣Neverputyourselfinadark14whenyoufeelleftoutandfindithardto15wellwithothers.areyoureadytolightyourlamp? 1A.appeared B.fell C.went D.closed 2A.basket B.toy C.lantern D.bag 3A.easy B.clear C.useful D.strange 4A.hear B.enjoy C.touch D.play 5A.Excuseme B.Comeon C.I'msorry D.Nevermind 6A.something B.nothing C.everything D.anything 7A.how B.why C.where D.which 8A.as B.like C.to D.of 9A.yourself B.himself C.myself D.ourselves 10A.time B.need C.way D.problem 11A.suchas B.insteadof C.becauseof D.asfor 12A.always B.never C.often D.usually 13A.after B.so C.if D.because 14A.situation B.village C.dream D.country 15A.turnon B.holdon C.puton D.geton

一个圆的直径是4分米则这个圆面积是．

一个三角形三个内角度数之比为252这个三角形中最大的一个内角是°如果把三角形按边进行分类它属于三角形．

如图所示在竖直平面内xOy坐标系中分布着与水平方向夹45°角的匀强电场将一质量为m带电量为q的小球以某一初速度从O点竖直向上抛出它的运动轨迹恰好满足抛物线方程y＝kx2小球运动能通过P．已知重力加速度为g求 1该匀强电场的电场强度E＝ 2小球到达P点所用时间t及末动能Ek

一个装满水的圆柱形容器底面积为24平方分米高为6分米容器中水的体积是升如果将这些水倒入一个底面长为9分米宽4分米高为8分米的长方体容器中水深分米．容器的厚度忽略不计

如图所示小球在竖直放置的光滑圆形管道内做圆周运动内侧壁半径为R小球半径为r则下列说法正确的是

物体甲做匀变速直线运动物体乙做匀速直线运动它们的位移﹣时间图象如图所示t＝2s时曲线与横轴相切．下列说法正确的是

Allthemembersdecidedtothemoneyfromthebooksaletohomelesspeople. A.giveup B.giveaway C.takeup D.takeaway

一半径为R的半球面均匀带有正电荷Q电荷Q在球心O处产生物的场强大小EO＝方向如图所示．把半球面分为表面积相等的上下两部分如图甲所示上下两部分电荷在球心O处产生电场的场强大小分别为ElE2把半球面分为表面积相等的左右两部分如图乙所示左右两部分电荷在球心O处产生电场的场强大小分别为E3E4．则

大胃王辉辉和盖瑞一起相约吃汉堡辉辉吃了所有汉堡的盖瑞吃了所有汉堡的还剩下这堆汉堡的几分之几

物理学中用磁感应强度B表征磁场的强弱磁感应强度的单位用国际单位制SI中的基本单位可表示为

一个正方体的表面积是24平方厘米它的体积是立方厘米．

为验证机械能守恒定律某同学做了如下实验将一小球用细绳悬挂于O点在O点正下方安装与光电计时器相连的光电门．将小球拉至细线水平由静止释放小球向下摆动后通过光电门光电门记录下了小球通过光电门的时间△t若测得小球的直径为d． 1小球通过光电门时的速度大小可表示为v＝ 2要验证小球在向下摆动过程中机械能守恒若测得悬点到小球球心的距离为L重力加速度用g表示需要验证的表达式是用△tdLg等物理量表示 3请写出一条有利于减少本实验误差的措施．

JackcomesfromAmericabutheknowsmany传统folkstoriesaboutChinesefestivals.

阅读如图程序框图若输出的数据为30则判断框中应填入的条件为

下列说法正确的是

如图甲所示在xOy坐标系的一四象限存在匀强磁场规定垂直纸面向里为磁场的正方向磁感应强度随时间的变化情况如图乙所示t＝0时刻一个比＝1.0×104C/kg的正电荷从0处以v0＝1.0×104m/s的速度沿y轴负方向射入磁场则

Benwasverytohaveadoghelper.luck

MyfatherdiedwhenIwasfive.Itwashardonusall.Mybrother.whoiseightyearsolderthanme.begantotakecareofmymotherandme. Hetookonmoreresponsibilitiesthanexpected.Irememberhemadesuretherubbishwastakenout.andtheyardwascleaned.Hedidonhisown.withoutbeingtoldtodoso. Becauseofmyfather'sdeath.momhadtogetafulltimejob.Brotherwouldgetmeupforschoolandmakemebreakfast.WhileIwaseating.hewouldlayoutmyclothes..makemybed.andgathermyschoolbooksup. Handinhandwewouldwalktothebusstop.Aswewaited.hewouldplaygamesmyfatherusedtoplaywithme.Whenwereturnedfromschool.wewerealoneforabouthalfanhour.untilmomwashomefromwork.BeforeIdidmyhomework.hewouldsitmedownwiththreecookiesandaglassofmilk.Thenhewouldpreparesomethingformomtocookdinner. Momwouldgreetuswithahugandkiss.Thiswasourtimetohavesomefunoutside.Thiswasmybrother'stimetobeakid. OneSaturdayinJuneseveralyearslater.mymotherandIwereatastorewheretheFather'sDaycardsweresold.Istaredatthecards.Momsaid.Cindy.Iknowthisishardtimeforyou. No.mom.That'snotit.Whydon'ttheyhaveBrother'sDaycards? Shesmiled.You'reright.yourbrotherhasexactlybeenafathertoyou.Goaheadtochooseacard. Ididso.andonFather'sDay.mymotherandIsatmybrotherdownandgavehimthecard. Ashereadit.Isawthetearsinhiseyes.Momsaid.Son.yourfatherisproudofyou.seeingthatheraisedagoodman.andthatyoudoyourbesttofillhisshoes.Weloveyouandthankyou. 1Whoaskedthebrothertotakeonmoreresponsibilities? A.Thefather. B.Themother. C.Hehimself. D.Cindy. 2Whatdidthebrotherdoforthewholefamily? ①HegotCindyupforschool.②Hepreparedfordinner. ③Hedidthedisheseveryday.④HegatheredupCindy'sbooks. ⑤HeplayedgameswithCindy.⑥HehelpedCindywiththehomework. A.①②③④ B.①②④⑤ C.①③④⑤ D.②③⑤⑥ 3Cindy'sbrotherreturnedtobeakidwhen. A.heplayedgameswithheratthebusstop. B.theystayedhomealonewaitingformom. C.heoffereddeliciouscookiesandmilk. D.theyhadfunoutsideaftermomcameback. 4Whilereadingthecard.Cindy'sbrotherfelt. A.down B.embarrassed C.moved D.angry 5What'sthebesttitleforthepassage?. A.MyChildhood B.MySecondFather C.AValuableCard D.ACarefulBrother

如图所示一横截面为半圆柱形的玻病砖圆心为O半径为R．某一单色光垂直于直径方向从A点剩入改璃折射光线经过P点OP与单色光的入射方向平行且A到O的距离为P到O的距离为R则玻璃砖对单色光的折射率为．若另有折射率n＝2的单色光仍沿原方向从A点射入该玻璃砖则单色光第一次到达玻璃砖面填能或不能发生全反射．

一Jimmywhatdoyouwanttobewhenyougrowup?一Iwanttobeengineer.A.a B.an C.the

某实验小组利用如图1所示的装置对轻质弹簧的弹性势能进行探究．一轻质弹簧放置在较光滑的水平桌面上弹簧右端固定左端与一小球接触但不拴接弹簧处于原长时小球恰好在桌面边缘．向右推小球使弹簧压缩一段距离后由静止释放小球离开桌面后落到铺有白纸和复写纸的水平地面上通过测量和计算可得到弹簧被压缩后的弹性势能． ①为测得小球离开桌面时的动能Ek已知重力加速度g需要测量下列物理量中的选填选项前的字母． A．小球的质量m B．小球抛出点到落地点水平距离s C．桌面到地面的高度h D．弹簧的压缩量x ②用所选择的测量量和已知量表示EkEk＝． ③如果忽略桌面摩擦阻力的影响可认为小球离开桌面时的动能Ek等于弹簧被压缩后的弹性势能Ep．实验时测得小球质量m＝190.0g桌面到地面的高度h＝40.00cm．已知弹簧的劲度系数k＝40N/m本地重力加速度g＝9.8m/s2． 某同学根据实验数据作出弹簧的弹性势能Ep与弹簧的压缩量的二次方x2关系的图象如图2所示．在Ep﹣x2图象中设图象的斜率为β由图象可得Ep随x2变化的表达式为．根据功与能的关系弹性势能的表达式中可能包含x2这个因子分析实验结果的单位关系与图线斜率有关的物理量应是．通过寻找这个物理量与β间的数值关系可得到弹簧的弹性势能的表达式为Ep＝．

把下面的数四舍五入到万位或亿位． 5079000≈ 150000000元≈

AmajorfiredestroyedNotre﹣Dame巴黎圣母院builtinthe12and13centuriesinPanisonApril52019.改为被动语态 Notre﹣Damebuiltinthe12and13centuriesinParisbyamajorfireonApri152019.

Onedayalittlemonkeyandalittlefoxwentouttoplay.Theysawanappletreeontheothersideoftheriver.Thereweremanybigandredapplesonit.Buttherewasnobridgeovertheriver.Themonkeythoughthardandhadanidea.Theypulleddownatreeandputitovertheriverasabridge. ThemonkeysaidMyoldfriendyougotherefirst.Butafterthefoxwenttotheothersidehekicked踢thetreeintotheriverandrantotheappletree.HowcanIgettherewithoutthetree?criedthemonkey.ThefoxlaughedandsaidYoujuststandthereandwatchmeeatingtheapples.Themonkeywasveryangry. Suddenlyitbegantorain.Thewaterlevel水位intheriverrose上涨andthetreeflewawaywiththewater.Youcaneatalltheapples.Butyoucan'tcomebackshoutedthemonkey.Thefoxstoppedeatingandlookedatthemonkeysadly. 1Whatdidthemonkeyandthefoxseeontheothersideoftheriver? A.Abridge. B.Anappletree. C.Aboat. 2Whothoughthardandhadanidea? A.Themonkey. B.Thefox. C.Bothofthem. 3Whatdidtheyputovertheriverasabridge? A.Atree. B.Anapple. C.Amonkey. 4Whywasthefoxsadatlast? A.Becausehewasangrywiththemonkey. B.Becausehecouldn'tcomeback. C.Becausehecouldn'teatapples. 5Whatdoesthestorytellusaccordingtothepassage? A.Thefoxshouldn'tgofirst. B.Themonkeycouldeatapplesfirst. C.Oneshouldn'tcareonlyabouthimself.

已知曲线y＝在x＝1处的切线l与直线2x+3y＝0垂直则实数a的值为．

1772年法籍意大利数学家拉格朗日在论文三体问题指出两个质量相差悬殊的天体如太阳和地球所在同一平面上有5个特殊点如图中的L1L2L3L4L5所示人们称为拉格朗日点．若飞行器位于这些点上会在太阳与地球共同引力作用下可以几乎不消耗燃料而保持与地球同步绕太阳做圆周运动．若发射一颗卫星定位于拉格朗日L2点下列说法正确的是

如图所示一足够长的木板在光滑水平面上以速度v向右匀速运动现将质量为m的物体竖直向下轻轻地放置在木板上的右端已知物体和木板之间的动摩擦因数为μ．为保持木板的速度不变须对木板施一水平向右的作用力F．从物体放到木板上到它相对木板静止的过程中力F做的功为

习__说:我们都在努力奔跑我们都是追梦人. Weareveryhardwearealldreamchasers.PresidentXiJinpingsaid.

﹣SimonyoulooksmartintheT﹣shirt.Couldyoutellmeit? ﹣OK.Iboughtitinastoreonline. A.whereyoubought B.wheredoyoubuy  C.whenyoubuy D.whendidyoubuy

某同学用如图甲所示装置验证机械能守恒定律力传感器固定在天花板上细线一端吊着小球一端连在力传感器上传感器显示细线拉力的大小．小球的质量为m当地的重力加速度为g． 1实验开始前用游标卡尺测出小球的直径示数如图乙所示则小球的直径D＝mm．再让小球处于自然悬挂状态测出悬线的长为L． 2将小球拉离平衡位置使细线与竖直方向成一定的张角θ由静止释放小球使小球在竖直面内做往复运动力传感器测出悬线的拉力随时间变化的关系如图丙所示则小球运动到最低点时速度的大小为v＝．小球摆到最高点时与最低点的高度差h＝均用已知和测量物理量的符号表示 3验证机械能守恒定律成立的表达式为用已知和测量物理量的符号表示．

已知椭圆C＝1a＞0b＞0的左右焦点分别为F1F2O为坐标原点P为第二象限内椭圆上的一点且∠F1PF2＝30°直线PF2交y轴于点M若|F1F2|＝2|OM|则该椭圆的离心率为

观察下图每一个黑色圆周围都要有6个白色圆照这样的规律画下去当画完第6个黑色圆时一共画了个白色圆当画完第a个黑色圆时一共画了个白色圆．

一Weshouldworkhard.We'llnevergiveup.Chinadreamcancometrue. 一Ithinkso.Let'stryourbest. A.But B.And C.Or

以下哪一个是3和0.9的倒数

下面两句话各把什么量看做单位1在横线里写一写．①小明拥有的积分卡数量是小方的．②小汽车比小卡车快．

已知函数fx＝axex﹣x2﹣2x+1其中a∈Re为自然对数的底数． 1若a＝1求函数fx的单调区间 2若x≥1时fx≥0恒成立求a的取值范围．

在一幅地图上3厘米表示实际距离3600米这幅图的比例尺是甲乙两地相距600米在这幅地图上的距离是厘米．

一XiaoLinthisdeskisheavyIcan'tmoveit. 一Don'tworry.I'llhelpyou. A.suchthat B.tooto C.sothat

如图平行板电容器AB两极板水平放置将其和二极管串联接在电源上已知A板和电源正极相连二极管具有单向导电性．一带负电小球从AB间的某一固定点水平射入打在B板上的N点小球的重力不能忽略现通过上下平移A板来改变两板间距则下列说法正确的是

Canyouimaginethatwecouldbuildabeautifulcitywithrubbish?Maybeyouwillthinkitis1.Howeveritcanbetrue!Nothingisawasteifwehaveacreativemind.Letmeshowyousomethingabout2rubbish. Sometimeswecanseetonsofrubbishinthestreetsontheroadsnearthebuildingshereandthere.Manylargecitiesbecamesougly3it.Nobodylikesrubbishbutinfactsomerubbishcanbeusedagain.Allofuswanttosolvetheproblemwemustdosomethingto4rubbish.Weshouldtakeactionfromnowon.5somegoodthingswillnotbewasted. Doyouoftenthrowawaythingsyoudon'tneedanymore?Haveyoueverthoughtabouthowthesethingscanactuallybeputtogooduse?Forexamplewhenacargetstooolditmaynotrunanymore.Butwecanusethemetalofthecartomakesomethingelse.Whenabottleisemptyit6aswaste.Youdon'tknowbottleglasscanbemadeintosandandusedtobuildstreets.Rubbish7foodcanbechangedintofertilizertomakeplantsgrowbetter.Itischeapandsafe.Andotherrubbishcanalsobeusedtomakebuildingblocks.Now8machinesaredesignedforthat.9peoplewillwatchfilmsinabeautifulcinemawhichisbuiltoutofrubbish.Besidesbuildingsandroadscitiesmaybemadefromrubbish.Butsofarbuildingbeautifulcitiesmadefromrubbishisonly10. 1A.important B.understanding C.unbelievable D.possible 2A.returning B.reusing C.reflecting D.repeating 3A.because B.becauseof C.insteadof D.asfor 4A.makealivingas B.makepromisesto C.makeupourmindto D.makeuseof 5A.Ontheway B.Bytheway C.Inthisway D.Outoftheway 6A.willbethrownaway B.willthrowaway C.threwaway D.wasthrownaway 7A.from B.in C.on D.to 8A.fewerandfewer B.lessandless C.moreandmore D.moreandless 9A.Someday B.Theotherday C.Nowadays D.Intheday 10A.asymbol B.aletter C.alesson D.adream

质量m＝260g的手榴弹从水平地面上以v0＝10m/s的初速度斜向上抛出上升到距地面h＝5m的最高点时炸裂成质量相等的两块弹片其中一块弹片自由下落到达地面落地动能为5J．重力加速度g＝10m/s2空气阻力不计火药燃烧充分求 1手榴弹爆炸前瞬间的速度大小 2手榴弹所装弹药的质量 3两块弹片落地点间的距离．

某旅游景点门票的原价是每张120元国庆节期间打八折优惠国庆节期间购买一张门票可以节省多少钱

直接写出得数．

某兴趣小组为测一遥控电动小车的额定功率进行了如下实验 ①用天平测出电动小车的质量为0.4kg ②将电动小车纸带和打点计时器按如图1所示安装 ③接通打点计时器其打点周期为0.02s ④使电动小车以额定功率加速运动达到最大速度一段时间后关闭小车电源．待小车静止时再关闭打点计时器设在整个过程中小车所受的阻力恒定． 在上述过程中打点计时器在纸带上所打的点迹如图2甲乙所示图中O点是打点计时器打的第一个点． 请你分析纸带数据回答下列问题 1该电动小车运动的最大速度为m/s 2该电动小车运动过程中所受的阻力大小为N 3该电动小车的额定功率为W．

随着年龄的增长.你周围的事物也发生了很大变化.请根据以下提示.以Greatchangesaroundme为题.写一篇短文. 写作要点1.过去.道路狭窄narrow.房展老旧.空气河水 2.现在.路面洁净宽阔.交通便利高楼林立蓝天白云.满城绿树鲜花.小鸟歌唱人们 3.感受. 写作要求1.要点齐全.省略号处须作适当发挥.但不要逐句翻译 2.语句连贯.条理清晰.详略得当.书写工整 3文中不得出现任何宾实的信息地名校名和人名等 4.100词左右.短文的翅目和开头已给出.不计入总词数. GreatChangesaroundMe Inthepastfewyears.greatchangeshavetakenplacearoundme.

Idon'twanttobeelse.Ijustwanttobe. A.anybody;myself B.somebody;myself  C.everybody;me D.anybody;me

OnApril23.2019aseriesofeventstocelebrate the1anniversaryoftheChinesePeople'sLiberationArmyPLANay中国人民海军washeldinQingdao. Destroyers驱逐舰sailedintheseasubmarines潜艇slidunderthesurfaceandfighterjetsflewacrossthesky.Itwasn'tascenefromawarmovieindeeditwasarealgrandnavalparade. Asalargecountry2morethan18000kilometersofcoastlineChinaneedsastrongnavy.Thiswasahardlesson3byhistory.AccordingtoXinhuafromthe1850suntil1949.foreignforcesusedtheseatomakeabout470invasionsofChina.ThereforethePLANavyhasbecomeakeylineofthenation'sdefense. AsPresidentXiJinpingsaidtheoceansareofgreatsignificanceastheysustainlifeandconnecttheworld.Theblueplanetthathumansinhabitisnotdividedintoislandsbytheoceans.4isconnectedbytheoceanstoformacommunitywithasharedfuturewherepeopleofallcountriessharewealandwoesaidXiduringhis5attheevent. 1A.seventy B.seventieth C.seventith D.seventeen 2A.has B.have C.with D.of 3A.teach B.taught C.learn D.learned 4A.But B.and C.or D.with 5A.speak B.talk C.chat D.speech

Whenwewatchmoviesaboutthefuturewesometimesseerobots.1Somerobotsareveryhuman﹣like.2它们能像人一样走路和跳舞.Somescientiststhinkthatinthefuturetheywillmakerobotsmorelikehumans.Howeversomescientiststhinkalthoughwecanmakerobotsmovelikepeopleitwillbedifficulttomakethemreallythinklikeahuman.ForexamplescientistJamesWhitethinksthat3robotswillneverbeabletowakeupandknowwheretheyare.4但是许多科学家不赞同怀特先生.Theythinkthatrobotswillevenbeabletotalklikehumansin25to50years.5Weneverknowwhatwillhappeninthefuture. 1. 2. 3. 4. 5.

下列几组量中不成反比例关系的是第组．

一物体静止在水平地面上在竖直向上拉力F作用下开始向上运动如图甲．在物体向上运动过程中其机械能E与位移x的关系图象如图乙已知曲线上A点的切线斜率最大不计空气阻力则

Thechildrenwere惩罚fortellinglies.

LeiFengSpiritCarryingon Itisnothardtodoonegooddeedbutitishardtodogooddeedsallyourlife.ChairmanMao1said.Andhecalledonpeopletolearnfromhim.Doyouknowwhothemanis?HeisLeiFeng. LeiFengwasborninapoorfamilyinalittlemountainvillageofHunanProvinceonDecember18th1940.Hedidn'tgotoschool2hewas10yearsold.Attheageof18hebecameasteel3.Hewasoftenpraisedforhisgoodjob.OnJanuary8th1960hejoinedthearmyandseveralmonthslaterhejoinedtheCommunistParty.HelovedthePartyandthepeopleandkeptdoingsomethinggoodforothers.Whenhegot4healwayssaidIt'smydutyandit'sjustthatsomepeopleneedsomehelpthereshouldbesomeonestandingout5themahand.Hebecameamodelsoldieroneyearlater.TooursadnessLeiFengdiedinanaccidentin1962. March5th6aLearnfromLeiFengDaysince1963.WhenLeiFeng'sDiarycameoutPeoplebegantoknowmoreabouthimthanbefore.NowthetermLivingLeiFenghasbecomeanameforanyonewhoisbraveanyonewhohas7loveforhiscountryanyonewhoworkshard8anyonewhoisalwaysreadytohelpothers. LeiFeng'sspiritwilllivein9hearts.LeiFeng'sspiritwillberememberedbythe10nationforever.Andwewillsurelypracticehisspiritinlifeashedid.

小黑参加田径赛跑一共花了30分钟到达终点前十分钟跑了总路程的中间十分钟跑了剩下路程的最后十分钟跑了总路程的．

如下图AB与CD平行E是AB的中点比较三角形甲和三角形乙的面积结果是

AWhat'syourfavoriteseasonTim? B1BecauseinspringtheweathergetswarmerandwarmerandIcanplanttrees. A2? BYesweplanttreeseveryyear. A3? BBecausetreesareimportanttous.Weshouldplantmoretreesandprotectthemwell. ATomorrowisTreePlantingDay.4? BSure.Welcometojoinus! A5? BLet'smeetattheschoolgateat800a.m..

如图所示质量相同的两个小球ab由斜面底端斜向上抛出分别沿水平方向击中斜面顶端A和斜面中点B不计空气阻力下列说法正确的是

﹣Who'sthelittleboyinthephoto? ﹣It'sme.ThephotowhenIwassixyearsold. A.takes B.took C.wastaken

一列简谐横波沿x轴正方向传播t＝0时刻的波形如图所示此时波刚好传播到x＝5m处的M点从此时起经过0.1s平衡位置在x＝1.5m处的质点第一次回到平衡位置．则下列判断正确的是

下列说法正确的有

算法统宗是明朝程大位所著数学名著其中有这样一段表述远看巍巍塔七层红光点点倍加增共灯三百八十一其意大致为有一栋七层宝塔每层悬挂的红灯数为上一层的两倍共有381盏灯则该塔 中间一层有盏灯．

下列有关热学知识的叙述中正确的是