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如图所示，小球从斜面的顶端A处以大小为V0的初速度水平抛出，恰好落到斜面底部的B点，且此时的速度大小vB＝v0，空气阻力不计，．该斜面的倾角为（ ）
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高三下学期物理《》真题及答案
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如图所示斜面上有abcde五个点ab＝bc＝cd＝de从a点以初速度v0水平抛出一个小球它落在斜面上
小球将落在c点与d点之间
小球将落在e点
小球落在斜面的速度方向与斜面的夹角大于θ
小球落在斜面的速度方向与斜面的夹角等于θ
如图所示将小球从斜面AB上某一点
水平抛出：第一次以初速度v0抛出，其落点到A.的水平距离为s1；第二次以初速度2v0抛出，其落点到A.的水平距离为s2，不计空气阻力，则s2与s1的比例不可能为（ ） A.2：1
3：1
4：1
5：1
如图所示小球从离地h=5m高离竖直墙水平距离s=4m处水平抛出不计空气阻力取g=10m/s2则1若要
如图所示从倾角为θ的斜坡顶端以初速度v0水平抛出一小球不计空气阻力设斜坡足够长则小球抛山后离开斜坡的
在倾角为的斜面顶端A点将一小球以初速度v0水平抛出问小球抛出后经过多长时间与斜面相距最远
所示一个斜面固定在水平面上从斜面顶端以不同初速度v0水平抛出小物体得到物体在空中运动时间t与初速度v
如图所示在倾角为θ=30°的光滑斜面的顶端O.点以不同的水平初速度抛出一小球以初速度v1抛出时落到斜
点，经过的时间为t
1
；以初速度v
2
抛出时，落到斜面的底端
点，经过的时间为t
2
。若让小球从O.点由静止释放，运动到底端B.点的时间为t
3
，则 A.t
2
=2t
1
B.t
3
=2t
2
v
2
=
v
2
=2v
1
如图所示在倾角为α的斜面的顶点将小球水平抛出若抛出时的初速度较大小球落到斜面上时的速度也较大因此有人
如图所示斜面上有abcde五个点ab＝bc＝cd＝de从a点以初速度v0水平抛出一个小球它落在斜面上
小球将落在c点
小球将落在e点
小球落在斜面的速度方向与斜面的夹角大于θ
小球落在斜面的速度方向与斜面的夹角等于θ
如图所示从倾角为θ的足够长的斜面P.点以速度v0水平抛出一个小球落在斜面上某处Q.点小球落在斜面上的
小球在空中运动的时间不变
夹角α将变大
PQ间距一定大于原来间距的3倍
夹角α与初速度大小无关
将一小球从倾角为θ图中未画出的斜面顶点以一定的初速度沿水平方向抛出小球落在斜面上如图所示.1若小球抛
如图所示斜面上有abcd四个点ab=bc=cd从a点以初速度V.0水平抛出一个小球它落在斜面上的b点
小球一定落在c点
小球可能落在d点与c点之间
小球落在斜面的运动方向与斜面的夹角一定增大
小球落在斜面的运动方向与斜面的夹角不相同
如图所示一小球自平台上水平抛出恰好落在临__台的一倾角为α=53°的光滑斜面顶端并刚好沿光滑斜面下滑
如图所示从倾角为θ的足够长的斜面顶端P以速度v0抛出一个小球落在斜面上某处Q点小球落在斜面上的速度与
空中的运动时间变为原来的2倍
夹角α将变大
PQ间距一定等于原来间距的4倍
夹角α与初速度大小无关
如图所示水平地面有一倾角为45°高为3.2m的斜坡从斜坡最高点将一小球沿水平方向抛出不计空气阻力g取
如图所示在倾角为α的斜面上A.点以初速度v0水平抛出一小球小球落在斜面上的B.点不计空气阻力求小球落
如图所示在倾角为α的斜面的顶点将小球水平抛出若抛出时的初速度较大小球落到斜面上时的速度也较大因此有人
如图所示从倾角为θ的足够长的斜面顶端P.以速度v0抛出一个小球落在斜面上某处Q.点小球落在斜面上的速
小球在空中的运动时间变为原来的2倍
夹角α将变大
PQ间距一定大于原来间距的3倍
夹角α保持不变
如图所示一小球自平台上水平抛出恰好无碰撞的落在临__台的一倾角为α=53°的光滑斜面顶端并刚好沿光滑
如图所示一小球自平台上水平抛出恰好落在临__台的一倾角为α=53°的固定光滑斜面顶端并刚好沿光滑斜面
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Ifyoufeelstressedbyresponsibilitiesatworkyoushouldtakeastepbackandidentify识别thoseof61greatandlessimportance.Thenhandlethemostimportanttasksfirstsoyou'llfeelarealsenseof62achieve.Leavingthelessimportantthingsuntiltomorrow63beoftenacceptable. Mostofusaremorefocused64ourtasksinthemorningthanwearelaterintheday.Sogetanearlystartandtrytobeasproductive65possiblebeforelunch.Thiswillgiveyoutheconfidenceyouneedtogetyouthroughtheafternoonandgohomefeelingaccomplished. Recent66studyshowthatwearefarmoreproductiveatworkifwetakeshortbreaks67regular.Giveyourbodyandbrainarestbysteppingoutsidefor68whileexercisingordoingsomethingyouenjoy. Ifyoufindsomethingyoulovedoingoutsideoftheofficeyou'llbelesslikely69bringyourworkhome.Itcouldbeanything﹣gardeningcookingmusicsports﹣butwhateveritis70makesureit'sarelieffromdailystressratherthananotherthingtoworryabout. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70.
内环境保持稳态是细胞进行正常生命活动的必要条件．图1表示进食后血糖浓度胰高血糖素和胰岛素三种物质含量的变化图2是两种糖尿病I型和Ⅱ型的发病机理．图3为人体生命活动调节示意图．请据图回答下列问题 1图1中表示胰岛素含量变化的是填字母． 2图1中A含量第二次升高的原因是A的含量增加导致了C含量达到最大值后含量下降这种调节属于． 3图2所示的两种糖尿病中糖尿病可以用注射胰岛素制剂的方法治疗．胰岛素分子从产生部位运输到靶细胞附近后只有与靶细胞表面上的结合后才能发挥降血糖的作用据此可分析Ⅱ型糖尿病的病因是． 4若图3表示体温调节过程则体温调节方式属于调节C→D→E调节过程参与血糖调节此过程属于调节．
Hundredsofpeoplehaveformedimpressionsofyouthroughthatlittledevice装置onyourdesk.Andthey'veneveractually41you.Everythingtheyknowaboutyou42throughthisdevicesometimesfromhundredsofmilesaway.43heyfeeltheycanknowyou44fromthesoundofyourvoice.That'showpowerfulthe45is. Powerfulyesbutnotalways46.ForyearsIdealtwithmytravelagentonlybyphone.RanimyfacelessagentwhomI'dnevermet47gotmerock﹣bottompricesonairfarescarsandhotels.Buthercoldvoicereally48me.Isometimeswishedto49anotheragent. OnemorningIhadto50animmediateflighthomeforafamilyemergency.IranintoRani'soffice51.Thewomansittingatthedesk52mymadnesssympatheticallyjumpedup.Shegavemea53smilenoddedwhilelisteningpatientlyandthenprintedoutthe54immediately.Whatawonderfullady!Ithought. Rushingout55IcalledoutovermyshoulderBythewaywhat'syourname?I'mRanishesaid.Iturnedaroundandsawa56womanwithabigsmileonherfacewavingtowishmeasafetrip.Iwas57!WhyhadIthoughtshewascold?Raniwaswellso58. SittingbackinthecaronthewaytotheairportIfigureditallout.Rani's59﹣﹣﹣herwarmsmilehernodsher‘I'mhereforyou'60﹣﹣﹣wereallsilentsignalsthatdidn'ttravelthroughwires. 41.A.accepted B.noticed C.heard D.met 42.A.came B.moved C.ran D.developed 43.A.Thus B.Yet C.Then D.Indeed 44.A.rather B.also C.just D.already 45.A.Telephone B.voice C.connection D.impression 46.A.direct B.useful C.easy D.accurate 47.A.inperson B.bymyself C.inpublic D.onpurpose 48.A.annoyed B.interested C.discouraged D.confused 49.A.promote B.train C.find D.know 50.A.arrange B.postpone C.confirm D.book 51.A.forthefirsttime B.atanytime C.fromtimetotime D.ingoodtime 52.A.expecting B.seeing C.testing D.avoiding 53.A.shy B.comforting C.familiar D.forced 54.A.bill B.form C.ticket D.list 55.A.hopefully B.disappointedly C.gratefully D.regretfully 56.A.careful B.serious C.nervous D.pleasant 57.A.amused B.worried C.helpless D.speechless 58.A.calm B.nice C.proud D.clever 59.A.forgiveness B.eagerness C.friendliness D.skillfulness 60.A.explanation B.attitude C.concept D.Behavior
What'sOn? ElectricUnderground 7.30pm﹣1.00amFreeattheCyclopsTheatre Doyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic. GeeWhizz 8.30pm﹣10.30pmComedyatKaleidoscope ComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐. Simon'sWorkshop 5.00pm﹣7.30pmWednesdaysatVictoriaStage Thisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny. CharlotteStone 8.00pm﹣11.00pmPizzaWorld Finefoodwithbeautifuljazzmusic;thisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine. 21.Whocanhelpyouifyouwanttohaveyourmusicproduced? A.JulesSkye.B.GeeWhizz. C.CharlotteStone.D.JamesPickering. 22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh? A.TheCyclopsTheatreB.Kaleidoscope C.VictoriaStageD.PizzaWorld 23.WhatdoweknowaboutSimon'sWorkshop? A.Itrequiresmembershipstatus. B.Itlaststhreehourseachtime. C.Itisrunbyacomedyclub. D.ItisheldeveryWednesday. 24.WhenwillCharlotteStoneperformhersongs? A.5.00pm﹣7.30pm. B.7.30pm﹣1.00am. C.8.00pm﹣11.00pm. D.8.30pm﹣10.30pm.
如图甲所示轻弹簧竖直固定在水平面上一质量为m＝0.2kg的小球从弹簧上端某高度处自由下落从它接触弹簧到弹簧压缩至最短的过程中弹簧始终在弹性限度内其速度v和弹簧压缩量△x的函数图象如图乙所示其中A为曲线的最高点小球和弹簧接触瞬间的机械能损失不计取重力加速度g＝10m/s2则下列说法中正确的是
如图所示虚线abc为电场中的一簇等势线相邻两等势面之间的电势差相等等势线a上一点A处分别射出甲乙两个粒子两粒子在电场中的轨道分别交等势线c于BC点甲粒子从A到B的动能变化量的绝对值是E乙粒子从A到C动能变化量绝对值为E．不计粒子的重力由此可以判断
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如图所示在固定的气缸A和B中分别用活塞封闭一定质量的理想气体活塞面积之比为SASB＝12两活塞以穿过B的底部的刚性细杆相连可沿水平方向无摩擦滑动．两个气缸都不漏气．初始时AB中气体的体积皆为V0温度皆为T0＝300K．A中气体压强PA＝1.5P0P0是气缸外的大气压强．现对A加热使其中气体的压强升到pA′＝2p0同时保持B中气体的温度不变．求此时A中气体温度TA．
1981年我国科学工作者在世界上首次人工合成了醇母丙氨酸tRNA用tRNAyAla表示．回答下列问题 1tRNA在细胞中的合成以为模板． 2一种tRNA可以携带种氨基酸． 3tRNAyAla的生物活性是指在蛋白质合成过程中既能携带丙氨酸又能． 4在测定人工合成的tRNAyAla活性时科学工作者先将3H﹣丙氨酸与tRNAyAla结合为3H﹣丙氨酸﹣tRNAyAla然后将其加入到蛋白质的生物合成体系中．若在新合成的多肽链中检测到则表明人工合成的tRNAyAla具有生物活性．还有其他不同的tRNA也能携带丙氨酸原因是． 5一个核糖体与mRNA的结合部位形成个tRNA结合位点． 6需要tRNA和核糖体参与的过程是． 7mRNA上的密码子与tRNA上的反密码子的对应关系是． 8请用一句话概括“基因”“性状”以及“蛋白质”之间的关系．
如图表示同一群落中的甲乙两个种群其δδ＝出生率/死亡率随时间的变化的曲线有关分析正确的是
假定你是李华你校摄影俱乐部photographyclub将举办国际中学摄影展.请给你的英国朋友Peter写封信.请他提供作品.信的内容包括: 1.主题:环境保护; 2.展览时间; 3.投稿邮箱:intlphotoshow@gmschool.com. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
JoyintheJourney Ifyouhaveeverbeendiscouragedbecauseoffailurepleasereadon.Foroftenachievingwhatyousetouttodoisnottheimportantthing.Letmeexplain. Twobrothersdecidedtodigadeepholebehindtheirhouse.Astheywereworkingacoupleofolderboysstoppedbyto1.Whatareyoudoing?askedoneofthevisitors.Weplantodigaholeallthewaythroughthe2!Oneofthebrothersvolunteered3. Theolderboysbeganto4tellingtheyoungeronesthatdiggingaholeallthewaythroughtheearthwas5.Afteralongsilenceoneofthe6pickedupajarfullofspiderswormsandmanyotherkindsofinsects.He7thelidandshowedthewonderful8tothescoffing嘲笑的visitors.Thenhesaidquietlyand9Evenifwedon'tdigallthewaythroughtheearthlookatwhatwehavefound10theway! Theirgoalwasfartooambitiousbutitdidcausethemtodig.Andthatis11agoalisfor﹣tocauseustomoveinthe12wehavechoseninotherwordstokeepus53!Butnoteverygoalwillbefully14.Noteveryjobwillend15.Noteveryhopewillcometopass.Noteverylovewilllast.Noteverydreamwillbe16.Butwhenyoufall17ofyouraimperhapsyoucansayYesbutlookatwhatIfoundalongtheway!Lookatthewonderfulthings18mylifebecauseItriedtodosomething!Itisinthedigging19lifeislived.AndIbelieveitisthejoyinthejourneyintheendthattruly20. 1.A.rest B.work C.watch D.laugh 2.A.house B.earth C.wall D.road 3.A.calmly B.patiently C.excitedly D.impatiently 4.A.laugh B.think C.stare D.smile 5.A.important B.difficult C.impossible D.interesting 6.A.passers﹣by B.watchers C.visitors D.diggers 7.A.pulled B.removed C.broke D.pushed 8.A.contents B.scenes C.pictures D.jars 9.A.properly B.confidently C.carefully D.happily 10.A.in B.along C.to D.out 11.A.what B.how C.where D.which 12.A.way B.direction C.life D.sight 13.A.thinking B.moving C.digging D.living 14.A.made B.prepared C.kicked D.achieved 15.A.hopelessly B.pleasantly C.surprisingly D.successfully 16.A.cometrue B.realized C.made D.treasured 17.A.short B.lost C.out D.behind 18.A.breakinginto B.turningto C.cominginto D.holdingto 19.A.when B.where C.which D.that 20.A.matters B.happens C.appears D.exists
如图所示．绕在铁芯上的线圈与电源滑动变阻器和开关组成闭合回路．在铁芯的右端套有一个表面绝缘的铜环A．不计铁芯和铜环A之间的摩擦．则下列情况中铜环A会向右运动的是
Iwanttostartwiththeresponsibilityyouhavetoyourself.Everysingleoneofyouhassomethingthatyou'regoodat.Everysingleoneofyouhassomethingtooffer.Andyouhavearesponsibilitytoyourselftodiscoverwhatthatis.That'stheopportunityaneducationcanprovide. Maybeyoucouldbeagreatwriter﹣maybeevengoodenoughtowriteabookorarticlesinanewspaper﹣butyoumightnotknowituntilyouwritethatEnglishpaper﹣thatEnglishclasspaperthat'sassignedtoyou.Maybeyoucouldbeaninnovatororaninventor﹣maybeevengoodenoughtocomeupwiththenextiPhoneorthenewmedicineorvaccine﹣butyoumightnotknowituntilyoudoyourprojectforyourscienceclass.MaybeyoucouldbeamayororasenatororaSupremeCourtjustice﹣butyoumightnotknowthatuntilyoujoinstudentgovernmentorthedebateteam. AndnomatterwhatyouwanttodowithyourlifeIguaranteethatyou'llneedaneducationtodoit.Youwanttobeadoctororateacherorapoliceofficer?Youwanttobeanurseoranarchitectalawyeroramemberofourmilitary?You'regoingtoneedagoodeducationforeverysingleoneofthosecareers.Youcan'tdropoutofschoolandjustdropintoagoodjob.You'vegottotrainforitandworkforitandlearnforit. Andthisisn'tjustimportantforyourownlifeandyourownfuture.Whatyoumakeofyoureducationwilldecidenothinglessthanthefutureofthiscountry.ThefutureofAmericadependsonyou.Whatyou'relearninginschooltodaywilldeterminewhetherweasanationcanmeetourgreatestchallengesinthefuture. 1.Whatistheresponsibilityyouhavetoyourself? A.Todiscoverwhatthatis. B.TostudyforthefutureofAmerica. C.Tobeagreatwriter. D.Tobeateacher. 2.What'stheopportunityaneducationcanprovideaccordingtothepassage? A.Tobeapresident. B.Tobeamillionaire. C.Tobeamayororasenator. D.Tomeetgreatestchallenges. 3.Whatwillyouneedtodoforapoliceofficer? A.Tofindagoodjob. B.Toneedagoodeducation. C.Todropoutofschool. D.Tobetrained. 4.Themainideaofthispassageis. A.educationthatAmericacanprovide B.whatyouwanttodowithyourlife C.theimportanceofeducation D.responsibility
如图第一象限内存在沿y轴负方向的匀强电场电场强度大小为E第二三四象限存在方向垂直xOy平面向外的匀强磁场其中第二象限的磁感应强度大小为B第三四象限磁感应强度大小相等一带正电的粒子从P﹣d0点沿与x轴正方向成α＝60°角平行xOy平面入射经第二象限后恰好由y轴上的Q点图中未画出垂直y轴进入第一象限之后经第四三象限重新回到P点回到P点时速度方向与入射时相同不计粒子重力求 1粒子从P点入射时的速度v0 2第三四象限磁感应强度的大小B′．
下列生命系统的活动不是单向进行的是
假定你校正在开展根除陋习创建文明校园活动.请你以此为主题用英语写一篇发言稿向全校学生倡议: 1.根除:乱扔垃圾浪费食物吸烟…2.提倡:讲礼貌互助… Dearfriends Asisknowntoallourschoolhaslaunchedacampaignagainstbadhabitsinordertobuildacivilizedcampus. That'sall.Thankyou.
Teacherssaythedigitalagehashadagoodinfluence﹣andanot﹣so﹣goodinfluence﹣onthisgenerationofAmericanteenagers.Morethan2000teacherstookanonlinesurvey.Three﹣quartersoftheteacherssaidtheInternetanddigitalsearchtoolshavehadamostlypositiveeffectontheirstudents'researchhabitsandskills.But64percentsaidthetechnologiesdomoretodistract使……分心studentsthantohelpthemacademically.And87percentagreedthatthesetechnologiesarecreatinganeasilydistractedgenerationwithshortattentionspans. ThePewInternetProjectdidthesurveywiththeNationalWritingProject.JudyBuchananisthevicedirectoroftheNationalWritingProjectandaco﹣authorofthereport.Ms.Buchanansaysdigitalresearchtoolsarehelpingstudentslearnmoreandfaster.Teachersreallyfavorthesetoolsbecausetheyarewaystomakesomeofthelearningexcitingandengaging.Youngpeoplefavorthesetools.Thegoalistoreallyhelpthembecomecreatorsofmeaningfulcontentandnotjustsortofconsumers. Butoneproblemthesurveyfoundisthatmanystudentslackdigitalliteracy.TheytrusttoomuchoftheinformationtheyfindontheInternet.Judysaysthesestudentshaven'tdevelopedtheskillstodeterminethequalityofonlineinformation.It'ssomethingthatreallyhastobetaughtandpaidattentionto.Becauseinaworldinwhichthingshappenquicklyyoudoneedtostepbackreflectandanalyzetheinformationyouhave. Anotherproblemisblamedonsomethingthatmightnotseemlikeaproblematall:beingabletoquicklyfindinformationonline.Teacherssaytheresultisareductioninthedesireandabilityoftheirstudentstoworkhardtofindanswers.Theysaystudentsareoverlydependentonsearchenginesanddonotmakeenoughuseofprintedbooksorresearchlibraries. ManyteachersarealsoconcernedthattheInternetmakesiteasyforstudentstocopyworkdonebyothersinsteadofusingtheirownabilities. 1.Thetextmainlytellsus. A.allthestudentsusedigitaltools B.theInternetisplayingakeyrole C.teachersencourageusingdigitaltools D.digitaltoolsbringaboutbenefitsandproblems 2.Whichofthefollowingbestshowsthestructureofthetext? ①＝Para1②＝Para2③＝Para3④＝Para4⑤＝Para5 3.Theunderlinedsentenceinthethirdparagraphprobablymeans. A.studentsdonothavetherightdigitaltools B.studentsdonotalwayshaveaccesstotheInternet C.studentshaven'ttheabilitytoadjustthemselves D.studentscan'tjudgeonlineinformationproperly 4.Somestudentsdon'ttendtoworkhardbecause. A.theycangetanswersontheInternetquickly B.printedbooksandlibrariesaroundaren'tenough C.theInternetcan'tmakestudentsconcentrate D.theycancopyeachothers'workwithoutbeingpunished
图1表示绿色植物叶肉细胞部分结构中的某些生命活动过程①一⑦代表各种物质甲乙代表两种细胞器．图2是某研究小组在25℃条件下以大豆为材料进行研究得到的实验结果光合作用的最适温度为25℃呼吸作用的最适温度为30℃．据图回答下列问题 1图1中甲增加膜面积主要是通过物质①利用光能分解产生图1中填写图中序号物质． 2若该绿色植物长时间处于__状态则图1中“⑥一⑤一⑥”的循环不能进行的原因是缺少和．若将该植物突然转移到高温强光照的环境中叶片气孔将 逐渐关闭此时叶肉细胞内物质⑥的含量变化是填“增加”“不变”或“减少”． 3图2中光照强度低于F时影响大豆光合作用的限制因子是．F光照强度下要使光合速率升高可以考虑的措施是提高填“CO2浓度”或“O2浓度”． 4若将图2的实验温度升高5℃则E点向填“左”或“右”侧移动．
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup. Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit. BrucePedersonthemanagingdirectorofBookCrossingsaysThetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth. Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit. Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome. BookCrossingispartofatrendamongpeoplewhowanttogetbacktotherealandnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries. 29.Whydoestheauthormentionbookgroupsinthefirstparagraph? A.Toexplainwhattheyare. B.TointroduceBookCrossing. C.Tostresstheimportanceofreading. D.Toencouragereaderstosharetheirideas. 30.WhatdoestheunderlinedworditinParagraph2referto? A.Thebook. B.Anadventure. C.Apublicplace. D.Theidentificationnumber. 31.WhatwillaBookCrosserdowithabookafterreadingit? A.Meetotherreaderstodiscussit. B.Keepitsafeinhisbookcase. C.Passitontoanotherreader. D.Mailitbacktoitsowner. 32.Whatisthebesttitleforthetext? A.OnlineReading:AVirtualTour B.ElectronicBooks:AnewTrend C.ABookGroupBringsTraditionBack D.AWebsiteLinksPeoplethroughBooks.
机械横波某时刻的波形图如图所示波沿x轴正方向传播质点P的坐标x＝0.32m．从此时刻开始计时 ①若每间隔最小时间0.4s重复出现波形图求波速 ②若P点经0.4s第一次达到正向最大位移求波速 ③若P点经0.4s到达平衡位置求波速．
食物进入胃会刺激胃壁上的感受器引起胰腺分泌多种消化酶由胃进入小肠的食物和盐酸会刺激小肠分泌促胰液素也能引起胰腺的分泌．下列相关分析错误的是
下列关于细胞结构与功能的叙述正确的是
利用紫外线诱变选育高产β﹣胡萝卜素的三孢布拉霉负菌未突变菌不能在含有一定浓度的β﹣紫罗酮的培养基上生长菌体随β﹣胡萝卜素含量增加从黄色加深至橙红色．图甲为选育及提取获得β﹣胡萝卜素流程请回答下列问题 1用紫外线照射三孢布拉霉负菌的目的是．为选出高产突变菌种还应在培养基中添加在接入菌种前应对培养基进行以避免杂菌污染． 2某同学进行正确的接种操作后平板经培养后的菌落分布如图乙所示．该同学的接种方法是由于所以培养基上只有少数菌能生长形成菌落． 3进行③过程时应选取色的菌落接种至液体培养基．过程⑥是用纸层析法鉴定提取的胡萝卜素粗品． 4将萃取的胡萝卜素样品与β﹣胡萝卜素标样层析后进行比对结果如图丙从图中分析可知色带为β﹣胡萝卜素．
如图所示正方形线框的左半侧处在磁感应强度为B的匀强磁场中磁场方向与线框平面垂直线框的对称轴MN恰与磁场边缘平齐．若第一次将线框从磁场中以恒定速度v1向右匀速拉出第二次以线速度V2让线框绕轴MN匀速转过90°为使两次操作过程中线框产生的平均感应电动势相等则
小张查阅资料得知α﹣淀粉酶的最适温度是55℃．如表是他为此进行的验证实验但因各组结果相同而不能达到实验目的 注溶液呈棕黄色即表示没有检测出淀粉以下改进措施中可行的是
Readingcanbeasocialactivity.Thinkofthepeoplewhobelongtobookgroups.Theychoosebookstoreadandthenmeettodiscussthem.NowthewebsiteBookCrossing.comBookCrossing.comturnsthepageonthetraditionalideaofabookgroup. Membersgoonthesiteandregisterthebookstheyownandwouldliketoshare.BookCrossingprovidesanidentificationnumbertostickinsidethebook.Thenthepersonleavesitinapublicplacehopingthatthebookwillhaveanadventuretravelingfarandwidewitheachnewreaderwhofindsit. BrucePedersonthemanagingdirectorofBookCrossingsaysThetwothingsthatchangeyourlifearethepeopleyoumeetandbooksyouread.BookCrossingcombinesboth. Membersleavebooksonparkbenchesandbusesintrainstationsandcoffeeshops.Whoeverfindstheirbookwillgotothesiteandrecordwheretheyfoundit. Peoplewhofindabookcanalsoleaveajournalentrydescribingwhattheythoughtofit.E﹣mailsarethensenttotheBookCrossingtokeepthemupdatedaboutwheretheirbookshavebeenfound.Brucepetersonsaystheideaisforpeoplenottobeselfishbykeepingabooktogatherdustonashelfathome. BookCrossingispartofatrendamongpeoplewhowanttogetbacktotherealandnotthevirtual虚拟.Thesitenowhasmorethanonemillionmembersinmorethanonehundredthirty﹣fivecountries. 29.Whydoestheauthormentionbookgroupsinthefirstparagraph? A.Toexplainwhattheyare. B.TointroduceBookCrossing. C.Tostresstheimportanceofreading. D.Toencouragereaderstosharetheirideas. 30.WhatdoestheunderlinedworditinParagraph2referto? A.Thebook. B.Anadventure. C.Apublicplace. D.Theidentificationnumber. 31.WhatwillaBookCrosserdowithabookafterreadingit? A.Meetotherreaderstodiscussit. B.Keepitsafeinhisbookcase. C.Passitontoanotherreader. D.Mailitbacktoitsowner. 32.Whatisthebesttitleforthetext? A.OnlineReading:AVirtualTour B.ElectronicBooks:AnewTrend C.ABookGroupBringsTraditionBack D.AWebsiteLinksPeoplethroughBooks.
某研究小组收集了两个电学元件电阻R0约为2kΩ和手机中的锂电池电动势E标称值为3.7V允许最大放电电流为100mA．实验室备有如下器材 A．电压表V量程3V电阻RV约为4.0kΩ B．电流表A1量程100mA电阻RA1约为5Ω C．电流表A2量程2mA电阻RA2约为50Ω D．滑动变阻器R10～40Ω额定电流1A E．电阻箱R20～999.9Ω F．开关S一只导线若干 1为了测定电阻R0的阻值小明设计了一电路如图甲所示为其对应的实物图图中的电流表A应选选填“A1”或“A2”请将实物连线补充完整． 2为测量锂电池的电动势E和内阻r小红设计了如图乙所示的电路图．根据测量数据作出﹣图象如图丙所示．若该图线的斜率为k纵轴截距为b则该锂电池的电动势E＝内阻r＝用kb和R2表示．该实验的测量值偏小造成此系统误差主要原因是．
野生型金黄色葡萄球菌对青霉素敏感将它接种到青霉素浓度为0.1单位/cm3的培养基上大多数菌株死亡极少数菌株能存活下来．存活下来的菌株经过不断选育最后可获得能生长在青霉素浓度为250单位/cm3的培养基上的细菌品系．据此分析下列有关说法正确的是
What'sOn? ElectricUnderground 7.30pm﹣1.00amFreeattheCyclopsTheatre Doyouknowwho'splayinginyourarea?We'rebringingyouaneveningofliverockandpopmusicfromthebestlocalbands.Areyouinterestedinbecomingamusicianandgettingarecordingcontract合同?Ifsocomeearlytothetalkat7.30pmbyJulesSkyeasuccessfulrecordproducer.He'sgoingtotalkabouthowyoucanfindtherightpersontoproduceyoumusic. GeeWhizz 8.30pm﹣10.30pmComedyatKaleidoscope ComeandseeGeeWhizzperform.He'sthefunnieststand﹣upcomedianonthecomedyscene.Thisjoyfulshowwillpleaseeveryonefromtheyoungesttotheoldest.GeeWhizzreallyknowshowtomakeyoulaugh!Ourbarisopenfrom7.00pmfordrinksandsnacks快餐. Simon'sWorkshop 5.00pm﹣7.30pmWednesdaysatVictoriaStage Thisisagoodchanceforanyonewhowantstolearnhowtodocomedy.Theworkshoplooksateverykindofcomedyandpracticesmanydifferentwaysofmakingpeoplelaugh.Simonisacomedianandactorwhohas10years'experienceofteachingcomedy.Hisworkshopsareexcitingandfun.AneveningwithSimonwillgiveyoutheconfidencetobefunny. CharlotteStone 8.00pm﹣11.00pmPizzaWorld Finefoodwithbeautifuljazzmusic;thisisagreateveningout.CharlotteStonewillperformsongsfromhernewbest﹣sellingCDwithJamesPickeringonthepiano.ThemenuisItalianwithexcellentmeatandfreshfishpizzasandpasta面食.Bookearlytogetatable.Ourbarisopenalldayandservescocktailscoffeebeerandwhitewine. 21.Whocanhelpyouifyouwanttohaveyourmusicproduced? A.JulesSkye.B.GeeWhizz. C.CharlotteStone.D.JamesPickering. 22.Atwhichplacecanpeopleofdifferentagesenjoyagoodlaugh? A.TheCyclopsTheatreB.Kaleidoscope C.VictoriaStageD.PizzaWorld 23.WhatdoweknowaboutSimon'sWorkshop? A.Itrequiresmembershipstatus. B.Itlaststhreehourseachtime. C.Itisrunbyacomedyclub. D.ItisheldeveryWednesday. 24.WhenwillCharlotteStoneperformhersongs? A.5.00pm﹣7.30pm. B.7.30pm﹣1.00am. C.8.00pm﹣11.00pm. D.8.30pm﹣10.30pm.
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