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如图所示，形状完全相同的光滑弧形槽A，B静止在足够长的光滑水平面上，两弧形槽相对放置，底端与光滑水平面相切，弧形槽高度为h，A槽质量为2m，B槽质量为M．质量为m的小球，从弧形槽A顶端由静止释放，重...
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高三下学期物理《》真题及答案
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在光滑水平地面上放有一质量为M.带光滑弧形槽的小车一个质量为m的小铁块以速度V0沿水平槽口滑去如图所
如图所示两完全相同的小球在挡板作用下静止在倾角为θ的光滑斜面上求甲乙两种情况下小球对斜面的压力之比.
如图所示光滑弧形轨道和一足够长的光滑水平轨道相连水平轨道上方有足够长的光滑绝缘体MN上挂一光滑铝环A
在光滑水平地面上放有一质量为M.带光滑弧形槽的小车一个质量为m的小铁块以速度V0沿水平槽口滑去如图所
如图所示在光滑平直的轨道上静止着两辆完全相同的平板车人从a车跳上b车又立即从b车跳回a车并与a车保持
如图所示质量为2m高度为h的光滑弧形槽末端水平放置在光滑水平地面上质量为m的小球A从弧形槽顶端静止
右端连有光滑弧形槽的水平桌面AB长L.＝1.5m如右图所示.将一个质量为m＝0.5kg的木块在F.＝
如图所示一质量为m的光滑弧形槽固定在光滑水平面上弧形槽的高为h一质量为m的物块B.静止放在光滑水平面
如图所示在光滑平直的轨道上静止着两辆完全相同的平板车人从a车跳上b车又立即从b车跳回a车并与a车保持
如图所示形状完全相同的光滑弧形槽AB静止在足够长的光滑水平面上两弧形槽相对放置底端与光滑水平面相切
如图所示ACB为光滑弧形槽弧形槽半径为R.R.＞＞甲球从弧形槽的球心处自由落下乙球从A.点由静止释放
如图所示两个相同的光滑弧形槽一个为A1B1C1凸形一个为A2B2C2凹形两个相同小球分别进入两弧形槽
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2
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如图8所示右端连有光滑弧形槽的水平桌面AB长L=1.5m一个质量为m=0.5kg的木块在F.=1.5
如图所示一块足够长的木板C.质量为2m放在光滑的水平面上在木板上自左向右放有A.B.两个完全相同的炭
如图所示平放在水平面上的轻质弹簧的一端固定在竖直墙上质量为m1的光滑弧形槽静止在光滑水平面上底部与水
右端连有光滑弧形槽的水平桌面AB长L.=2.0m如图使一个质量为m＝0.5kg的木块在F.=1.5N
右端连有光滑弧形槽的水平桌面AB长L.＝1.5m如图所示将一个质量为m＝0.5kg的木块在F.＝1.
2015年·张掖市天一中学模拟如图所示弹簧的一端固定在竖直墙上质量为2m的光滑弧形槽静止放在足够长的
如图所示轻弹簧的一端固定在竖直墙上质量为m的光滑弧形槽静止放在光滑水平面上弧形槽底端与水平面相切一个
在下滑过程中，物块的机械能守恒
在下滑过程中，物块和槽的动量守恒
物块被弹簧反弹后，做匀速直线运动
物块被弹簧反弹后，能回到槽高h处
如图所示质量为M.的弧形槽静止在光滑的水平面上弧形槽的光滑弧面底端与水平地面相切一个质量为m的小物块
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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．
屠呦呦1971年发现分离提纯并用于治疟新药“青蒿素”拯救了数千万人的生命．青蒿素分子结构如图．下列说法错误的是
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.
NA代表阿伏加德罗常数的数值下列说法正确的是
我国科学家在天然气脱硫研究方面取得了新进展利用如图装置可发生反应H2S+O2─H2O2+S↓． 已知甲池中发生的反应为下列说法正确的是
我国90%以上的水域污染是因水体中的NP含量过高而引起的富营养化造成的．在这里时常采用生态浮床法以漂浮材料为载体将高等水生植物栽植到载体中通过植物的根系吸收或吸附作用削减水体中的氮磷等污染物质从而净化水质．回答下列问题 1水中NP元素含量过高可能引起藻类大量繁殖．藻类属于生态系统组成成分中的藻类大量繁殖后最终会导致水生动植物大量死亡该变化过程填“属于”或“不属于”群落演替． 2水中NP元素含量过高通过水体自身的净化作用难以消除NP的影响表明此时生态系统的稳定性遭到破坏而难以自动修复． 3在水域生态系统中NP等元素在之间进行循环流动．在利用生态浮床治理时为防止浮床植物中富集的NP重新进入水体可采取的措施是．
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
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.
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
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
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．
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.
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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