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如图所示，绝热性能良好的汽缸开口向上，缸中用绝热性能良好的活塞封闭一段气体，气柱的长为h，活塞与汽缸内壁无摩擦且气密性良好，活塞的质量为m，横截面积为S，大气压强为p0，开始时缸中气体的温度为T0，...
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高三下学期物理《》真题及答案
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发泡保温管在管外敷设普通绝热结构其缺点是绝热性能较真空绝热管差
热容量大
脆弱
保冷性能差
占据空间大
如图B2-4所示为幕墙中空玻璃的构造单位mm将其与240mm砖墙的有关性能相比．下列哪个是正确的
绝热性好，隔声性好
绝热性差，隔声性好
绝热性好，隔声性差
耐热性差，隔声性差
如图所示面积S=100cm2的轻活塞A将一定质量的气体封闭在导热性能良好的汽缸B内汽缸开口向上竖直放
将导热系数小于的材料称为绝热材料水的导热系数密封空气的导热系数所以材料吸水后的绝热性能降低
某绝热材料受潮后其绝热性能明显下降请分析原因
导热系数λ是衡量绝热材料性能优劣的主要指标下列哪项描述正确的是
λ值越小，其绝热性能越好
表观密度大的材料其孔隙率大，因此导热系数小，绝热性能好
孔隙率相同时，孔隙尺寸越小，导热系数越小
孔隙相互连通比不连通者的导热系数大，绝热性能差
复合材料风管采用法兰连接时法兰与风管板材的连接应可靠其绝热层不得外露不得采用降低板材强度和绝热性能的
孔隙率越大材料的导热系数越其材料的绝热性能越
机舱内高温管壁通常用石棉材料包扎因其有良好的绝热性能
导热系数大
可以任意改变形状
导热系数小
可以任意增减厚度
石棉用作绝热材料是因为石棉具有良好的导热性
如图B2-9所示为幕墙中空玻璃的构造单位mm将其与240mm砖墙的有关性能相比下列哪个是正确的［20
绝热性好，隔声性好
绝热性差，隔声性好
绝热性好，隔声性差
耐热性差，隔声性差
炉膛应要有良好的以减少热量损失
密封性能
绝热性能
耐热性能
密闭性能
如图所示绝热性能良好的汽缸开口向上缸中用绝热性能良好的活塞封闭一段气体气柱的长为h活塞与汽缸内壁无摩
不是多层绝热的优点
绝热性能优越
稳定性好
预冷损失小
易于对形状复杂的表面绝热
中空玻璃具有的性能
绝热性能好
隔声性能好
防霜露性好
防盗性好
如图所示为幕墙中空玻璃的构造单位mm将其与240mm砖墙的有关性能相比下列哪个是正确的?
绝热性好，隔声性好
绝热性差，隔声性好
绝热性好，隔声性差
耐热性差，隔声性差
对翅片管的性能基本要求良好的传热性能和良好的
中空玻璃的特点有
绝热性能好
隔声性能好
防霜露性能好
质量轻
碳弧气刨枪的电极夹头应导电性良好夹持牢固外壳绝缘及绝热性能良好更换 碳棒方便压缩空气喷射集中而准确
炉膛要有良好的以减少热量损失
密封性能
绝热性能
耐热性能
导热性能
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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
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
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．
如图所示梯形状的玻璃砖平放在白纸上其中AB∥CDF为DE中点在F正下方插上两枚大头针P1P2然后在AB側观察并在A点正上方的G点插上大头针P3使P3挡住P1P2．已知AE∥BC∠C＝90°lAE＝lAG＝lAD＝l光在空气中的传播速度为c求 i该玻璃砖的折射率 ii光从G点传播到F点所用的时间．
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．
如图所示导热良好的气缸AB通过有阅门K的细管相连气缸粗细均匀高度都为h且内壁光滑A的截面积为B的4倍上端都与大气连通且B的上端有一个卡口两气缸中各有一厚度可忽略的轻活塞ab开始时阀门K关闭活塞a下方充有理想气体活塞b下方为真空原长为h的轻弹簧与b固连．大气压为P0外界和气缸内气体温度均为7℃活塞ab都静止在气缸的正中央在活塞a上缓慢加上一定量的铁砂稳定后a下降了忽略细管的体积．求 i此时A中气体的压强． i打开阀门K当气缸外界温度缓慢上升到37℃时活塞a到气缸A底部的距离．气缸外界环境的压强变化忽略不计
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．
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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