高三(上)定时训练19
- 格式:doc
- 大小:158.00 KB
- 文档页数:15
高三生物定时练考试范围:减数分裂和受精作用;命题人:王燕审题人:任金红姓名:___________班级:___________学号:___________一、选择题1.关于同一个体中细胞有丝分裂和减数第一次分裂的叙述,正确的是A.两者前期染色体数目相同,染色体行为和DNA分子数目不同B.两者中期染色体数目不同,染色体行为和DNA分子数目相同C.两者后期染色体行为和数目不同,DNA分子数目相同D.两者末期染色体行为和数目相同,DNA分子数目不同2.理论上同卵双胞胎有完全相同的DNA,实际上他们的基因也不完全一样,消灭差异缘由可能是A.父亲或母亲在形成生殖细细胞的过程中,非同源染色体发生了自由组合B.父亲或母亲在形成生殖细胞的过程中,同源染色体之间发生了交叉互换C.个体发育的有丝分裂过程中,个别细胞的同源染色体之间发生了交叉互换D.个体发育的有丝分裂过程中,个别细胞的染色体上某一基因发生了基因突变3.下列关于某二倍体哺乳动物同一个体中细胞有丝分裂和减数其次次分裂的叙述,正确的是A.着丝点分裂时通过核孔进入细胞核的物质削减B.后者在后期时细胞内存在大小形态相同的同源染色体C .中期时后者细胞内染色体组数是前者的两倍D .前期时前者细胞内性染色体的数量是后者的两倍4.下面为某种生物的部分染色体发生了两种变异示意图。
图中①和②,③和④互为同源染色体,则对两图所示的变异叙述正确的是A.均为基因重组B.图a中染色体的变化发生在减数第一次分裂的前期C.基因的数目和排列挨次均发生转变D.图b中染色体的变化只能在有丝分裂过程中发生5.某生物的基因型为AaBb,已知Aa和Bb两对等位基因分别位于两对非同源染色体上,那么该生物的体细胞,在有丝分裂的后期,基因的走向是()A.A与B走向一极,a与b走向另一极 B.A与b走向一极,a与B走向另一极C.A与a走向一极,B与b走向另一极 D.走向两极的均为A、a、B、b6.基因型为Aa的植物产生的配子是()A.雌:雄=1:1 B.雌:雄=1:4C.A:a=1:1 D.AA:aa=1:17.下列现象中,与减数分裂同源染色体联会行为肯定有关的是①人类的47.XYY综合征个体的形成②线粒体DNA突变会导致在培育大菌落酵母菌时消灭少数小菌落③三倍体西瓜植株的高度不育④一对等位基因杂合子的自交后代消灭3:1的性状分别比⑤受精卵分裂时个别细胞染色体特别分别,可形成人类的21三体综合征个体A.①②B.①⑤C.③④D.④⑤8.下图所示为某二倍体生物的正常细胞及几种突变细胞的一对常染色体和性染色体.以下分析不正确的是A.图中正常雄性个体产生的雄配子类型有四种B.突变体Ⅰ的形成可能是由于基因发生了突变C.突变体Ⅱ所发生的变异能够通过显微镜直接观看到D.突变体Ⅲ中基因A和a的分别符合基因的分别定律9.右图所示为某动物卵原细胞中染色体组成状况,该卵原细胞经减数分裂产生3个极体和1个卵细胞,其中一个极体的染色体组成是1、3,则卵细胞中染色体组成是A.2、4B.1、3C.1、3或2、4D.1、4或2、310.某二倍体动物某细胞内含10条染色体,10个DNA分子,且细胞膜开头缢缩,则该细胞()A.将形成配子 B.正在发生基因自由组合C.处于有丝分裂中期 D.正在发生DNA复制11.下列关于同源染色体和姐妹染色单体的叙述,不正确的是A.它们所含的基因都是相同的B.它们的外形,大小一般都是相间的C.同源染色体的联会仅仅发生在减数分裂过程中D.姐妹染色单体是由一个共同着丝点连接着的两条染色单体12.在哺乳动物的某一器官中,发觉了如下细胞分裂图象,下列有关叙述错误的是()A.甲图处于减数第一次分裂过程中,含有两对同源染色体B.在乙图所示的细胞中,含有1对同源染色体,4个姐妹染色单体C.正在发生同源染色体分别的是丙图细胞D.该器官肯定是哺乳动物的睾丸13.如图是某一生物体内有关细胞分裂的图解与图像,依据图示下列叙述不正确的是()。
高三教课质量检测语文试题2020.01一、现代文阅读(共36 分)(一 )论述类文本阅读( 此题共 3 小题,9 分 )阅读下边的文字,达成下边1~3 题。
“共和国勋章”获取者屠呦呦对于青蒿素的研究,正是从东晋葛洪《肘后备急方》“青蒿方”所载“青蒿一握,以水二升渍,绞取汁,尽服之”中,启迪了新的研究思路,经过改用低沸点溶剂的提取方法,富集了青蒿的抗疟组分,最后发现了青蒿素,应用于世界特别是非洲地域,拯救了数百万疟疾患者的生命。
有着“人民科学家”荣誉称呼的吴文俊对于数学机械化思想方法的研究,受启发于《隋书·律历志》的记录:祖冲之当先世界千年之久的圆周率π值源于刘徽《九章算术注》“割圆术”,“割之弥细,所失弥少;割之又割,以致于不行割,则与圆周合体而无所失矣”。
以上两个例子,说明中国传统文化特别是儒学对中国传统科学的发展是有踊跃影响并有现代意义的。
中国传统科技基因,完整能够古为今用。
事实上,中国传统文化早在2000 多年前的春秋战国期间,已经有了百花怒放、百花齐放的繁华场面。
儒学的开门祖师孔子,是创始“私学”的大教育家,他以“有教无类”和“因材施教”、培育“博学通才之士”为目标和目标,对学生进行礼、乐、书、数、御、射“六艺”教育。
此中,数即数学,乐和声学有关,御和力学有关,射和机械有关。
儒家的“六艺”教育详细付诸教材,即古代经典,这此中遍及古代科学的因子,如《易》,誓易道广大,包罗万象,旁及天文、地理、音律、兵法、韵学、算术,以逮方外之炉火力;《诗经》中包括有大批虫鱼、鸟兽、草木,以及天文、地理、农业生产等知识;《礼记》中有农业与季节有关的知识;《考工记》则是有关手工业技术的特地著作。
孔子之孙孔伋 (子思 )的《中庸》有言:“博学之,审讯之,慎思之,明辨之,笃行之。
”学、问、思、辨、行,完整切合研究科学的方法和步骤,即获守信息、提出题目、逻辑推理、查验结果、躬身实践。
作为“孔子之言而曾子述之”的《大学》,有八目:格物、致知、诚心、正心、修身、齐家、治国、平天下。
45分钟解答题定时训练第一套1. 已知πsin()410A +=,ππ(,)42A ∈(Ⅰ)求cos A 的值;(Ⅱ)求函数5()cos 2sin sin 2f x x A x =+的值域.2.。
如图,在直三棱柱111ABC A B C -中,5AB AC ==,D ,E 分别为BC ,1BB 的中点,四边形11B BCC 是边长为6的正方形.(Ⅰ)求证:1A B ∥平面1AC D ; (Ⅱ)求证:CE ⊥平面1AC D ; (Ⅲ)求二面角1C AC D --的余弦值.3.甲,乙两人进行乒乓球比赛,约定每局胜者得1分,负者得0分,比赛进行到有一人比对方多2分或打满6局时停止.设甲在每局中获胜的概率为1()2p p >,且各局胜负相互独立.已知第二局比赛结束时比赛停止的概率为59.(Ⅰ)求p 的值; (Ⅱ)设ξ表示比赛停止时比赛的局数,求随机变量ξ的分布列和数学期望E ξ.4.函数x a x x f ln )(2-=(R a ∈).(Ⅰ)若2=a ,求证:)(x f 在(1,)+∞上是增函数;(Ⅱ)求)(x f 在[1,e]上的最小值.1.知函数x x x f 2sin 262sin 2)(-⎪⎭⎫⎝⎛+-=π,R x ∈求函数)(x f 的最小正周期;(2)记ABC ∆的内角A,B,C 的对边长分别为c b a ,,,若3,1,1)2(===c b Bf ,求a 的值。
2.知三棱锥P-ABC 中,⊥PA 平面ABC, AC PA AC AB ,==⊥AB 上一点,AB= 4AN, M ,D ,S 分别为PB,AB, BC 的中点。
(1平面CDM;(2)求证:SN ⊥平面CDM; (3 ) 求N MC D --的大小。
3.振兴旅游业,某省2009年面向国内发行了总量为2000万张的优惠卡,其中向省外人士发行的是金卡,向省内人士发行的是银卡。
某旅游公司组织了一个有36名游客的旅游团到该省旅游,其中43是省外游客,其余是省内游客。
2022-2023学年第一学期高三期末化学学科练习题相对原子质量:O-16K-39Fe-56一、涉及教材内容题(30分)选择题只有一个正确答案,每题3分,下同。
1.化学与人类生产、生活、社会可持续发展密切相关,下列说法错误的是A.制作冰墩墩的PVC(聚氯乙烯)和PC(聚碳酸酯)均是有机合成高分子化合物B.“天和核心舱”声学通信定位系统所用芯片的主要原料为晶体硅C.国家速滑馆“冰丝带”采用CO2超临界制冰,比氟利昂制冰更加环保D.可在钢铁部件表面进行发蓝处理(生成一层致密的三氧化二铁薄膜)对其进行防护2.下列化学用语正确的是A.具有8个中子的氧原子:188OB.NH4Cl的电子式C.乙醇的实验式:C2H6OD.CO2分子的填充模型:3.下列有关物质的性质与用途具有对应关系的是A.水玻璃具有黏合性强的特点,可用作木材防火剂B.二氧化硫具有还原性,可用作漂白剂、防腐剂C.K2FeO4具有强氧化性,可用作自来水的消毒剂D.氨气极易溶于水,因此液氨可用作制冷剂4.下列有关结构和性质的说法中,正确的是A.酸性:HCl>H2S,所以非金属性:Cl>SB.同周期(除0族)元素原子的最外层电子数越多,越容易得电子,非金属性越强C.HF、HCl、HBr、HI的热稳定性和还原性均依次减弱D.同周期元素的简单离子半径从左到右逐渐减小5.设A N为阿伏加德罗常数的值,下列说法正确的是A.足量MnO2与含4molHCl的浓盐酸充分反应,转移电子数为2A NB.标准状况下,11.2LHF含有的分子数为0.5A NC.20g重水(D2O)中含有的电子数为10A ND.2molNO与1molO2在密闭容器中充分反应后的分子数为2A N6.I.原子序数小于等于36的Q、W、X、Y、Z、R六种元素,它们的原子序数依次增大,其中Q是原子半径最小的元素,W和Y的基态原子2p能级所含成单电子数均为2,Z的基态原子核外含有13种运动状态不同的电子,R元素的最外层电子数与Q相同,其未成对电子数在同周期中最多,回答下列问题(涉及元素时用对应的元素符号表示):(1)R元素原子的电子排布式为_____。
2024届高三定时训练语文试题2023. 11注意事项:l.本试卷共10页。
消分150分。
考试时间150分钟。
2.作答时,诮将选择题答案按要求涂写在答题卡上,其他试题答案写在答题卡上,写在试卷上无效。
一、现代文阅读(35分)(一)现代文阅读I(本题共5小题,19分)阅读下面的文字,完成1~5题。
在艺术方面.受情感饱和的意象是嵌在一种格律里面的.格律的起源都是归纳的,格律的应用都是演绎的。
它本来是自然律,后来才变为规范律。
专就诗来说,我们来看格律如何本来是自然的。
韵是音节中一个成分。
音节除韵以外,在幸句长短和平仄交错中也可以见出。
章句长短和平仄交错的存在理由也和韵一样.都是顺着情感的自然需要。
分析到究竞,情感是心感于物的激动.和脉搏、呼吸诸生理机能都密切相关。
这些生理机能的节奏都是抑扬相间,往而复返,长短轻重成规律的。
情感的节奏见于脉搏、呼吸的节奏,脉持、呼吸的节奏影响语言的节奏。
诗本来就是一种语言,所以它的节奏也随情感的节奏于往复中见规律。
最初的诗人都无意于规律而自合于规律,后人研究他们的作品,才把替在的规律寻绎出来。
例如“诗大半用韵”“章句长短大半有规律”之类。
这本来是一种自然律,后来作诗的人如法炮制。
从前的诗人多用五言或七言,他们于是也用五言或七言;从前的诗人五言起句用仄仄平平仄,次句往往用平平仄仄平,于是他们也用同样的次笫。
这样一来,自然律就变成规范律了。
诗的声韵如此,其他艺术的格律也是如此,都是把前规看成定例。
艺术上通行的作法是否可以定成格律,以便后人如法炮制呢?这是一个很难的问题,绝对肯定和绝对否定都不免有流弊。
从历史上看,艺木的前规大半是先由自然律变为规范律,再由规范律变为死板的形式的。
一种作风在初盛时,自身大半都有不可磨灭的优点。
后未闻风响应者得其形似而失其精神,有如东施学西施捧心,在彼为美者在此反增其丑。
流弊渐深,反动随起.于是文艺上有所诮“革命运动”。
文艺革命的首领本来要把文艺从格律中斛放出未,但是他们的闻风响应者又把他们的主张定为新格律。
25题定时练习(一)要求:1、所有同学10分钟,得10分以上(最低要求)。
基础较好的同学15分钟左右得20分2、解题顺序:读题不放过每一句话,边读题、边看图。
3分钟左右根据受力情况理清运动过程或根据运动情况理清受力情况2分钟左右根据问题选择恰当的过程或者某一状态进行分析解答5分钟左右3、答题要求:必要的文字说明(研究过程或某一状态、研究对象)字母符号连贯(例:t1 t2 t3)表达式或方程分行写出、不连等、不代数4、特别注意:A、在电场磁场中一定注意是否考虑重力和电荷的电性B、物理情景是在水平面还是在竖直平面25(1).(20分)如图所示,A、B是两块完全相同的长木板,质量均为1kg,紧挨着放在水平面上,但并没有粘连(可以分开)。
现有一质量为2kg的滑块(可视为质点)静置于A木板左端。
己知滑块与木板间的动摩擦因数μ1 = 0.5,木板与水平面间动摩擦因数μ2 = 0.25;现对滑块施加水平向右的恒力F=14N作用1s后撤去,撤去F时滑块恰好运动到A、B木板的分界处,g取10m/s2。
求:(1)木板A的长度L;(2)在A、B木板运动的全过程中,B木板能达到的最大速度v;(3)在A、B木板运动的全过程中,B与地面之间因摩擦产生的热Q。
25(2).(20分)如图所示,在E=103 V/m的水平向左匀强电场中,有一光滑半圆形绝缘轨道竖直放置,轨道与一水平绝缘轨道MN连接,半圆轨道所在竖直平面与电场线平行,其半径R=40 cm,一带正电荷q=10-4 C的小滑块质量为m=40 g,与水平轨道间的动摩擦因数μ=0.2,取g=10 m/s2,问:(1)要小滑块恰好运动到圆轨道的最高点C,滑块应在水平轨道上离N点多远处释放?(2)这样释放的滑块通过P点时对轨道压力是多大?(P为半圆轨道中点)(3)小滑块经过C点后最后落地,落地点离N点的距离多大?落地时的速度是多大?25(3).(20分)如图所示,竖直平面内的直角坐标系xoy 中,在x <0的区域内存在竖直方向的匀强电场(图中未画出),第三象限内平行于y 轴的虚线左侧区域I 中还存在方向垂直于纸面向外的匀强磁场.有一长为8.5L 的绝缘粗糙直杆沿与x 轴正方向成θ=37°固定放置,其PQ 段中点恰好与坐标原点O 重合,端点Q 在区域I 的边界上.质量为m 、电荷量为q (q>0)的小球(可视为质点)穿在直杆上,小球可在杆上自由滑动.将小球从P 点静止释放,小球沿杆运动,随后从Q 端离开直杆进入区域I ,小球在区域I 中恰好做匀速圆周运动,一段时间后垂直穿过x 轴.已知PQ 段长度为L ,小球和杆之间的动摩擦因数=μ0.5,整个过程中小球所带电荷量不变,重力加速度为g ,sin37°=0.6,cos37°=0.8 . 求(1)场强的大小及方向;(2)磁感应强度的大小;(3)若改变小球在直杆上静止释放的位置,求小球从Q 点经磁场偏转后直接到达x 轴的时间.25(4).(20分)如图所示,半径为R 的光滑半圆轨道AB 竖直固定在一水平光滑的桌面上,轨道最低点B 与桌面相切并平滑连接,桌面距水平地面的高度也为R 。
课后限时作业19 动能定理时间:45分钟1.(多选)质量不等,但有相同动能的两个物体,在动摩擦因数相同的水平地面上滑行,直至停止,则( BD )A .质量大的物体滑行的距离大B .质量小的物体滑行的距离大C .它们滑行的距离一样大D .它们克服摩擦力所做的功一样多解析:由动能定理得-μmgs =-E k ,所以s =E kμmg ,知质量小的物体滑行距离大,选项A 、C 错误,B 正确;克服摩擦力做功W f =E k 相同,选项D 正确.2.如图所示,质量为m 的物块与水平转台间的动摩擦因数为μ,物块与转轴相距R ,物块随转台由静止开始转动.当转速增至某一值时,物块即将在转台上滑动,此时转台已开始匀速转动,在这一过程中,摩擦力对物块做的功是(假设物块所受的最大静摩擦力等于滑动摩擦力)( D )A .0B .2μmgRC .2πμmgRD.μmgR2解析:物块即将在转台上滑动但还未滑动时,转台对物块的最大静摩擦力恰好提供向心力,设此时物块做圆周运动的线速度为v ,则有μmg =m v 2R .在物块由静止到获得速度v 的过程中,物块受到的重力和支持力不做功,只有摩擦力对物块做功,由动能定理得W=12m v2-0.联立解得W=12μmgR.故选项D正确.3.如图所示,质量为0.1 kg的小物块在粗糙水平桌面上滑行4 m 后以3.0 m/s的速度飞离桌面,最终落在水平地面上,已知物块与桌面间的动摩擦因数为0.5,桌面高0.45 m,若不计空气阻力,g取10 m/s2,则(D)A.小物块的初速度是5 m/sB.小物块的水平射程为1.2 mC.小物块在桌面上克服摩擦力做8 J的功D.小物块落地时的动能为0.9 J解析:小物块在桌面上克服摩擦力做功W f=μmgL=2 J,选项C错误;在水平桌面上滑行时,由动能定理得-W f=12m v2-12m v20,解得v0=7 m/s,选项A错误;小物块飞离桌面后做平抛运动,有x=v t、h=12gt2,解得x=0.9 m,选项B错误;设小物块落地时动能为E k,由动能定理得mgh=E k-12m v2,解得E k=0.9 J,选项D正确.4.有两个物体a和b,其质量分别为m a和m b,且m a>m b,它们的初动能相同,若a和b分别受到不变的阻力F a和F b的作用,经过相同的时间停下来,它们的位移分别为s a和s b,则(C) A.F a<F b,s a>s b B.F a>F b,s a>s bC.F a>F b,s a<s b D.F a<F b,s a<s b解析:设物体的初速度为v,初动能为E k,所受的阻力为F,通过的位移为s,物体的速度与动能的关系为E k=12m v2,得v=2E km,由s=v+02t得,s=E k2m t,由题意可知物体a、b运动时间和初动能相同,则质量越大,位移越小,因m a>m b,所以s a<s b;由动能定理得,-Fs=0-E k,因初动能相同,F与s成反比,则F a>F b,故选项C正确.5.如图所示,小物块与水平轨道、倾斜轨道之间的动摩擦因数均相同,小物块从倾角为θ1的轨道上高度为h的A点由静止释放,运动至B点时速度为v1.现将倾斜轨道的倾角调至为θ2,仍将物块从轨道上高度为h的A点静止释放,运动至B点时速度为v2.已知θ2<θ1,不计物块在轨道接触处的机械能损失.则(C)A.v1<v2B.v1>v2C.v1=v2D.由于不知道θ1、θ2的具体数值,v1、v2关系无法判定解析:物体运动过程中摩擦力做负功,重力做正功,由动能定理可得mgh-μmg cosθ·hsinθ-μmgx BD=12m v2,即mgh-μmg·htanθ-μmgx BD=12m v2,因为htanθ=x CD,所以mgh-μmgx BC=12m v2,故到达B点的速度与倾斜轨道的倾角无关,所以v1=v2,故选项C正确.6.质量m=10 kg的物体只在变力F作用下沿水平方向做直线运动,F随坐标x的变化关系如图所示.若物体从坐标原点处由静止出发,则物体运动到x=16 m处时的速度大小为(C)A.3 m/s B.4 m/sC.2 2 m/s D.17 m/s解析:F-x图线与x轴围成的面积表示力F所做的功,则这段过程中,外力做功为W=12×(4+8)×10 J-12×4×10 J=40 J,根据动能定理得W=12m v2,解得v=2Wm=2×4010m/s=2 2 m/s,故C正确,A、B、D错误.7.(多选)如图所示,在水平地面上O点正上方的A、B两点同时水平抛出两个相同小球,它们最后都落到地面上的C点,则两球(AC)A.不可能同时落地B.落在C点的速度方向可能相同C.落在C点的速度大小可能相同D.落在C点的重力的瞬时功率可能相同解析:小球在竖直方向做自由落体运动,由h=12gt2可知高度不同,所以运动时间一定不同,故A正确;平抛运动轨迹为抛物线,速度方向为该点的切线方向,分别从A、B两点抛出的小球轨迹不同,在C点的切线方向也不同,所以落地时方向不可能相同,故B错误;由动能定理得mgh =12m v 2-12m v 20,落地速度为v =v 20+2gh ,则知落在C 点的速度大小可能相同,故C 正确;落在C 点时重力的功率P =mg v y =mg 2gh ,由于是两个相同的小球,而下落的高度不同,所以重力的功率不相同,故D 错误.8. (多选)如图所示,轻质弹簧上端固定,下端系一物体.物体在A 处时,弹簧处于原长状态.现用手托住物体使它从A 处缓慢下降,到达B 处时,手和物体自然分开,此过程中,物体克服手的支持力所做的功为W .不考虑空气阻力.已知弹簧形变量为Δx 时,弹簧获得的弹性势能为12k (Δx )2,k 为弹簧的劲度系数.关于此过程,下列说法正确的是( BD )A .物体重力势能减少量一定小于WB .弹簧弹性势能增加量一定等于WC .物体与弹簧组成的系统机械能增加量为WD .若将物体从A 处由静止释放,则物体到达B 处时的动能为W 解析:物体在向下运动的过程中,要克服弹簧弹力做功W 弹力,根据动能定理知mgh -W -W弹力=0,故物体重力势能减少量一定大于W ,故选项A 错误;到达B 处时,由平衡条件知kh =mg ,即mgh -W =12kh 2=12mgh ,弹簧弹性势能增加量一定等于W ,选项B 正确;物体克服手的支持力所做的功为W ,机械能减少W ,故选项C 错误;物体从静止下落到B 处过程中,根据动能定理有mgh -12kh 2=E k ,而12kh 2=12mgh ,可知E k =12mgh =W ,故选项D 正确. 9.如图所示,一个可视为质点的滑块从高H =12 m 处的A 点由静止沿光滑的轨道AB 滑下,进入半径为r =4 m 的竖直圆环,圆环内轨道与滑块间的动摩擦因数处处相同,当滑块到达圆环顶点C 时,滑块对轨道的压力恰好为零,滑块继续沿CFB 滑下,进入光滑轨道BD ,且到达高度为h 的D 点时速度为零,则h 的值可能为(重力加速度大小g 取10 m/s 2)( B )A .8 mB .9 mC .10 mD .11 m解析:滑块到达圆环顶点C 时对轨道压力为零,由牛顿第二定律得mg =m v 2Cr ,得速度v C =gr ,设滑块在BEC 段上克服摩擦力做的功为W 1,由动能定理得mg (H -2r )-W 1=12m v 2C ,则W 1=mg (H -2r )-12m v 2C =mg ⎝⎛⎭⎪⎫H -52r ,滑块在CFB 段克服摩擦力做的功W 2满足0<W 2<W 1,从C 到D ,由动能定理得-mg (h -2r )-W 2=-12m v 2C ,代入得8 m<h <10 m ,选项B 正确.10.(多选)质量为1 kg 的物体在水平粗糙的地面上受到一水平外力F 作用运动,如图甲所示,外力F 和物体克服摩擦力f 做的功W 与物体位移x 的关系如图乙所示,重力加速度g 为10 m/s 2.下列分析正确的是( ACD )A .物体与地面之间的动摩擦因数为0.2B .物体运动位移为13 mC .前3 m 运动过程中物体的加速度为3 m/s 2D .x =9 m 时,物体速度为3 2 m/s解析:由W f =fx 对应图乙中的b 可知,物体与地面之间的滑动摩擦力f =2 N ,由f =μmg 可得μ=0.2,选项A 正确;由W F =Fx 对应图乙a 可知,前3 m 内,拉力F 1=5 N,3~9 m 内拉力F 2=2 N ,物体在前3 m 内的加速度a 1=F 1-fm =3 m/s 2,选项C 正确;由动能定理得W F -fx =12m v 2可得x =9 m 时,物体的速度为v =3 2 m/s ,选项D 正确;设物体运动的最大位移为x m ,由动能定理得W F -fx m =0,即物体的最大位移x m =W Ff =13.5 m ,选项B 错误.11.如图所示,两个半圆柱A 、B 紧靠着静置于水平地面上,其上有一光滑圆柱C ,三者半径均为R .C 的质量为m ,A 、B 的质量都为m2,与地面间的动摩擦因数均为μ.现用水平向右的力拉A ,使A 缓慢移动,直至C 恰好降到地面.整个过程中B 保持静止.设最大静摩擦力等于滑动摩擦力,重力加速度为g .求:(1)未拉A时,C受到B作用力的大小F;(2)动摩擦因数的最小值μmin;(3)A移动的整个过程中,拉力做的功W.解析:(1)C受力平衡2F cos30°=mg解得F=33mg.(2)C恰好降到地面时,B受C压力的水平分力最大F x max=32mgB受地面的摩擦力f=μmg根据题意f min=F x max解得μmin=3 2.(3)C下降的高度h=(3-1)R,A的位移x=2(3-1)R,摩擦力做功的大小W f=fx=2(3-1)μmgR 根据动能定理W-W f+mgh=0-0解得W=(2μ-1)(3-1)mgR.答案:(1)33mg(2)32(3)(2μ-1)(3-1)mgR12.游乐场有一种滑雪游戏,其理想简化图如图甲所示,滑道由倾角为θ=30°的斜坡和水平滑道组成.小孩在距地面高h=10 m处由静止开始沿斜坡滑下,到达底端时恰好滑上水平滑道上放置的长为l =3 m木板(忽略木板厚度),此后小孩和木板运动的v-t图象如图乙所示.已知斜坡滑道与水平滑道平滑连接,速度由斜坡方向转为水平方向时大小不变,不计小孩在运动过程中受到的空气阻力,重力加速度g取10 m/s2.求:(1)小孩与斜坡间的动摩擦因数;(2)小孩脱离木板时的速度大小.解析:(1)对小孩在斜面上的运动过程,由题图乙可知,小孩滑到斜面底端时的速度v=10 m/s.由动能定理可得mgh-μmg cosθ·hsinθ=12m v2解得μ=36.(2)由图乙知小孩在t=0.5 s时滑离木板,木板在0~0.5 s内的位移x木=1.5 m又x木+l=x人设小孩滑离木板的速度为v人,由平均速度公式x人=12(v+v人)t可得:v人=8 m/s.答案:(1)36(2)8 m/s感谢您的下载!快乐分享,知识无限!由Ruize收集整理!。
高三晨读训练19一、语言基础知识1.依次填入下面横线处的词语,恰当的一项是()①外面出现了第一片接近南方的_________,如同水墨画一片模糊。
②当我忧从中来、无可告语的时候,一想到大海,心胸就__________起来。
③地皮________,这是通达公司在市中心建造摩天大楼的重要原因。
A.景点开阔紧缺 B.景色开朗紧缺C.景色开阔紧俏 D.景点开朗紧俏2.下列各句中,加点成语使用恰当的一句是A.学校周边环境存在的各种问题,人大代表呼吁过,政府部门整治过,但人们对整治结果不敢恭维,因为这种整治不过是扬汤止沸之计。
B.小侄子很滑稽,我们常常被他的言行逗得忍俊不禁地笑起来。
C.在学校举行的高三学生“百日誓师”大会上,几位学习标兵夸夸其谈,会场气氛十分热烈。
D.您是有着重大贡献的科学家,而我只是一个芸芸众生,社会舞台上的一个小角色,怎好作比呢?3.对下列句子中修辞手法及其表达效果的解释,不正确的一项是()A.酒入豪肠,七分酿成了月光,余下的三分啸成剑气,绣口一吐就是半个盛唐.﹣﹣用夸张的修辞手法凸显了诗仙李白的逼人才气和对盛唐诗歌的巨大影响B.要论中国人,必须不被搽在表面的自欺欺人的脂粉诓骗,却看看他的筋骨和脊梁.﹣﹣用比喻的修辞手法说明看人不能被美化了的假象迷惑,要看他们的气节、品质C.那一望无边挤得密密层层的大荷叶迎着阳光舒展开,就像铜墙铁壁一样.粉色荷花箭高高地挺出来,是监视白洋淀的哨兵吧.﹣﹣用比喻、借代的修辞手法表现出白洋淀人民对家乡的热爱D.以抒情而言,有的春风得意、壮志激烈,有的情爱幽怨、离愁别绪,有的愤世嫉俗、忧国忧民﹣﹣用排比的修辞手法,将抒情的种种内容列举出来,读起来酣畅淋漓4. 依次填入下面横线上的句子,与上下文衔接最恰当的一组是(3分)在21世纪的今天,正确对待人和大自然的关系比以往任何时候都重要。
______,______,______,______;______,______,结果也受到了大自然的报复。
2011年普通高等学校夏季招生考试英语(辽宁卷)二、完形填空( 本大题共 1 题, 共计30 分)This year I decided to do something to regain my good name as a kindly uncle. My __(1)__,Tony,had never forgiven me for the dictionary I had bought him as a birthday present last year. His __(2)__ had no reason to be thankful to me either,because the year before,I had __(3)__ their dear son with a pot of paste(浆糊)and some funny pictures. Instead of __(4)__ them into a book,Tony had naturally covered every wall in the house with them. This year, __(5)__,I decided to let him __(6)__ for himself.We went into a big shop,but Tony was very particular about __(7)__.Although I tried to show him toy after toy,he was not to be __(8)_.Then I saw he suddenly became __(9)__;he had discovered something he really liked:a large tin drum. I was quite happy too—_(10)__ I thought what Tony's mother would say when she saw it. Nobody would get any __(11)__ for weeks!I led Tony away __(12)__,saying that the drum was too expensive.Tony asked for permission to go off __(13)__ and I made the most of my chance to sit down and _(14)__ my aching feet. Fifteen minutes passed but there was still no sign of Tony. I began to get _(15)__ and got up to look for him. I asked a young lady if she had seen a little boy in a grey suit. She looked __(16)__ her helplessly and pointed out that there were so many _(17)__ in grey suits. I was just going to call the police for help,when I saw a strange __(18)__ dressed in strange orange clothes. He was wearing a false beard and had a caveman's axe(斧子)in one hand,and a space gun in the other. It was,of course,Tony,who informed me __(19)__ that he was the first __(20)__ to fly into space.(1)A.cousin B.daughter C.grandson D.nephew(2)A.friends B.parents C.classmates D.brothers(3)A.presented B.annoyed C.confused D.occupied(4)A.entering B.dividing C.sticking D.drawing(5)A.anyhow B.though C.again D.therefore(6)A.guess B.choose C.pay D.see(7)A.sweets B.toys C.clothes D.books(8)A.pleased B.disturbed C.accepted D.disappointed(9)A.surprised B.hopeful C.patient D.excited(10)A.after B.until C.unless D.since(11)A.shock B.trouble C.peace D.time(12)A.happily B.eagerly C.cautiously D.quickly(13)A.on his own B.in his way C.now and then D.more or less(14)A.drag B.rest C.lay D.step(15)A.ashamed B.angry C.worried D.doubtful(16)A.about B.to C.at D.across(17)A.young ladies B.new customers C.loving parents D.small boys(18)A.figure B.actor C.man D.doll(19)A.on time B.at once C.just now D.once again(20)A.policeman B.spaceman C.caveman D.postman三、阅读理解( 本大题共 4 题, 共计30 分)1、(6分)I got my first driver's license(执照)in 1953 by taking driver education in my first year at Central High School in Charlotte, North Carolina. Four years later when it was time to renew my license I was a married woman. Henry and I were living in Baltimore, Maryland. Two weeks before my 20th birthday, Henry drove me to the motor vehicle office on a hot July afternoon. When I got to the office and showed to the man behind the counter my North Carolina driver's license, ready to renew, the man told me that I was under age by Maryland law since I was not yet 21.“Mr.Henry Smith, your husband, will have to sign for you,”he said.I argued, pointing to a very large belly(肚子)of mine,“I am married. I am having a baby. Why should I have to have someone sign for me to drive?”He answered coldly,“It's the law, madam.”Henry encouraged me to calm down, just go ahead and get the license and be done with it.“No,”I said. I refused to have him sign for me. So I left without a Maryland license.I called the North Carolina Motor Vehicle Office and renewed my NC license by mail—using my name Susan Brown. And thus it was for the next twelve years. Since Henry was in the army I could drive under my home state license. By the time Henry left the army we were once again living in Maryland, and I had to take the Maryland driver's exam. Since then I just go in and renew every four years—sign the name Susan Brown, have my new picture taken, and walk out with a license to drive.(1)Susan got her first driver's license ______.A.before she got married to Henry B.when she was twenty years oldC.after she finished high school D.when she just moved to Maryland(2)Susan failed to renew her license the first time in Maryland because ______.A.she was forbidden to drive by Maryland law B.she lacked driving experience in Maryland C.she was to give birth to a baby soon D.she insisted on signing for herself(3)We can infer from the text that in the U.S.______.A.American males should serve in the army B.different states may have different laws C.people have to renew their licenses in their home statesD.women should adopt their husbands' family names after marriage2、(8分)About 21,000 young people in 17 American states do not attend classes in school buildings. Instead, they receive their elementary(初等)and high school education by working at home on computers. The Center for Education Reform says the United States has 67 public “cyber-schools,”and that is about twice as many as two years ago.The money for students to attend a cyber-school comes from the governments of the states where they live. Some educators say cyber-schools receive money that should support traditional public schools. They also say it is difficult to know if students are learning well.Other educators praise this new form of education for letting students work at their own speed. These people say cyber-schools help students who were unhappy or unsuccessful in traditional schools. They say learning at home by computer ends long bus rides for children who live far from school.Whatever the judgment of cyber-schools, they are getting more and more popular. For example, a new cyber-school called Commonwealth Connections Academy will take in students this fall. It will serve children in the state of Pennsylvania from ages five through thirteen.Children get free equipment for their online education. This includes a computer, a printer, books and technical services. Parents and students talk with teachers by telephone or by sending emails through their computers when necessary.Students at cyber-schools usually do not know one another. But 56 such students who finished studies at Western Pennsylvania Cyber Charter School recently met for the first time. They were guests of honor at their graduation.(1)What do we know from the text about students of a cyber-school?A.They have to take long bus rides to school. B.They study at home rather than in classrooms. C.They receive money from traditional public schools. D.They do well in traditional school programs. (2)What is a problem with cyber-schools?A.Their equipment costs a lot of money. B.They get little support from the state government. C.It is hard to know students' progress in learning. D.The students find it hard to make friends.(3)Cyber-schools are getting popular because ______.A.they are less expensive for students B.their students can work at their own speed C.their graduates are more successful in society D.they serve students in a wider age range(4)We can infer that the author of the text is ______.A.unprejudiced in his description of cyber-schools B.excited about the future of cyber-schools C.doubtful about the quality of cyber-schools D.disappointed at the development of cyber-schools 3、(8分)Many people believe Henry Ford invented the automobile(汽车).But Henry Ford did not start to build his first car until 1896.That was eleven years after two Germans developed the world's first automobile. Many people believe Henry Ford invented the production line that moved a car's parts to the worker, instead of making the worker move to the parts. That is not true, either. Many factory owners used methods of this kind before Ford. What Henry Ford did was to use other people's ideas and make them better. And he made the whole factory a moving production line.In the early days of the automobile, almost every car maker raced his cars. It was the best way of gaining public notice. Henry Ford decided to build a racing car.Ford's most famous race was his first one. It was also the last race in which he drove the car himself.The race was in 1901,at a field near Detroit. All of the most famous cars had entered, but only two were left: the Winton and Ford's. The Winton was famous for its speed. Most people thought the race was over before it began.The Winton took an early lead. But halfway through the race, it began to lose power. Ford started to gain. And near the end of the race, he took the lead. Ford won the race and defeated the Winton. His name appeared in newspapers and he became well known all over the United States. Within weeks of the race, Henry Ford formed a new automobile company. In 1903,a doctor in Detroit bought the first car from the company.That sale was the beginning of Henry Ford's dream. Ford said:“I will build a motor car for the great mass of people. It will be large enough for the family, but small enough for one person to operate and care for. It will be built of the best materials. It will be built by the best men to be employed. And it will be built with the simplest plans that modern engineering can produce. It will be so low in price that no man making good money will be unable to own one.”The Model T was a car of that kind. It only cost $850.It was a simple machine that drivers could depend on. Doctors bought the Model T. So did farmers. Even criminals. They considered it the fastest and surest form of transportation. Americans loved the Model T. They wrote stories and songs about it. Thousands of Model T's were built in the first few years.(1)What do we know about Henry Ford from Paragraph 1?A.He made good use of ideas from others. B.He produced the first car in the world.C.He knew how to improve auto parts. D.He invented the production line.(2)Why did Henry Ford take part in the 1901 car race?A.To show off his driving skills. B.To draw public attention.C.To learn about new technology. D.To raise money for his new company.(3)“That sale”in Paragraph 4 refers to ________.A.the selling of Ford cars at reduced prices B.the sale of Model T to the mass of peopleC.the selling of a car to a Detroit doctor D.the sales target for the Ford Company(4)What was Henry Ford's dream according to the text?A.Producing cars for average customers. B.Building racing cars of simple design. C.Designing more car models. D.Starting more companies.4、(8分)The Coalition for the Homeless is an organization that seeks to address the needs of the homeless population in the United States. It is a network of offices, some of which provide food and houses for the homeless population, and some of which fight for the passing of laws that would give every American the right to a place to call home. According to the Coalition's studies, of over two hundred million people living in the United States, up to three million are homeless—and the number is still growing. Since the late1970s,fast rising house prices, large cuts in government supported housing programs, and economic recession(经济衰退)have made it impossible for many Americans to meet housing costs. Sadly, this has resulted in a number of persons being forced to leave their homes and/or unable to find new affordable homes. According to another research, families with children appear to be the fastest growing part of the homeless population, making up 39% of it. The old idea of a homeless person, that of the single man who gets drunk all the time, is no longer true. A much larger part of the population now finds itself homeless. Even worse, once a person becomes homeless, he often finds it impossible to find a job, since most employers require anyone who wants a job from them to provide a home address on a job application. (1)The word “address”in the first sentence probably means “________”.A.talk about B.deal with C.fight for D.write to(2)How many people are homeless in the U.S. according to the Coalition studies?A.39% of the population. B.200 million people.C.About 3 million people. D.About one-fifth of the population.(3)Homeless people often have difficulty finding a job because ________.A.they have no home addresses B.they mostly have a drinking problemC.they aren't supported by government programs D.they often don't have enough work experience (4)What is the main cause of the rising number of the homeless in the U.S.?A.The passing of new housing laws. B.The fast growth of family size.C.The slow construction of houses. D.The ever-rising price of housing.四、阅读填空( 本大题共 1 题, 共计10 分)1、(10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。