限时训练6

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高三模拟一“6+4+选考”限时训练

高三模拟一“6+4+选考”限时训练

模拟一“6+4+选考”限时训练[时间:45分钟分值:36+39+15]第Ⅰ卷一、选择题(本大题共6小题,每小题6分。

在每小题给出的四个选项中,只有一项是符合题目要求的。

)12.A.人体内成熟的红细胞中没有线粒体,不能产生ATPB.ATP中的能量可以来源于光能和化学能,也可以转化为光能和化学能C.在有氧与缺氧的条件下,细胞质基质都能形成ATPD.ATP中的“A”与构成DNA、RNA中的碱基“A”表示的不是同一物质3.下图表示人体内干细胞的增殖分化。

下列有关叙述正确的是()A.干细胞与白细胞的基因型不同,因此合成的mRNA和蛋白质种类也不相同B.血小板和红细胞内遗传信息的流动方向是DNA→DNA→RNA→蛋白质C.图示细胞中,干细胞不仅具有较强的分裂能力,而且分裂周期也较短D.白细胞能够穿过血管壁去吞噬病菌,这是因为细胞膜的选择透过性4.下图中表示转录过程的是()5.亲缘关系较远的物种,由于相似的生活方式,整体或部分形态结构向着同一方向改变,这属于趋同进化。

在趋同进化过程中()A.通过相互选择,不同生物的基因库趋于相同B.同一区域的不同物种之间不存在相互选择和影响C.自然选择使不同生物对同一环境产生了相似的适应性D.不同生物将演化为形态结构相似的同一物种6.人工合成的植物激素类似物常用于生产实践。

图1所示是激素类似物甲和激素类似物乙对月季生根的影响,图2所示是激素类似物甲在其X、Y和Z三种浓度下对月季茎段侧芽生长的影响。

据图判断下列相关叙述中,错误的是()A.激素类似物乙抑制月季插条生根B.激素类似物甲和激素类似物乙具有协同作用C.X浓度的激素类似物甲对月季茎段侧芽生长具有抑制作用D.图2所示的结果可以说明激素类似物甲的作用具有两重性第Ⅱ卷二、非选择题(包括必考题和选考题两部分,考生根据要求做答)(一)必考题(包括4小题,共39分)(注:气孔导度能反映气孔张开的程度,其单位是mmolCO2·m-2·s-1,表示单位时间内进入叶片表面单位面积的CO2的量)(1)请在坐标图中画出植物Ⅰ和植物Ⅱ一天中气孔导度的变化曲线。

6《六一居士传》限时训练题(教师版)

6《六一居士传》限时训练题(教师版)

6《六一居士传》练习阅读《六一居士传》一文,完成练习。

1.对下列句子中加线的词的解释,不正确的一项是()A. 余将见子疾走..大喘渴死疾走:快速奔跑B. 子欲逃名..者乎逃名:逃避名声C. 吾素慕..之,宜去一也素慕:向来羡慕D. 吾尝用于时矣,而讫无称..焉无称:没有名称2.对下列句子中加线的词的解释,不正确的一项是()A. 将退休..于颍水之上辞退官职B. 聊以志.吾之乐尔志向C. 未足喻.其乐且适也形容D. 尚何暇.于五物哉闲暇3.下列加点词的意义和用法不同于其他三项的是()A.太山在前而.不见B.使吾形不病而.已悴C.子知轩裳珪珪组之累其形,而.不知五物之累其心乎D.既老而.衰且病,将退休于颍水之上4.下列各句中加点的字与例句“而屡易其.号”中的“其”字意思相同()A. 客曰:其.乐如何B. 赐其.骸骨C.吾其.何择哉D.其.大者有二焉5.以下各组句子中,句式与其他三项不同的一项是()A.吾家藏书一万卷B. 虽响九奏于洞庭之野C.六一居士初谪滁山D.夫士少而仕,老而休6.下列各组句子中,句式不相同的一组是()A. 六一,何谓也?句读之不知,惑之不解B. 方其得意于五物也申之以孝悌之义C. 世事之为吾累者众也身客死于秦,为天下笑D. 此吾之所以志也石之铿然有声者,所在皆是也7.最能表明作者渴望隐退的原因的一组()①.予将见子疾走大喘渴死,而名不得逃也。

②. 太山在前而不见,疾雷破柱而不惊③. 使吾形不病而已悴,心未老而先衰④. 夫士少而仕,老而休,盖有不待七十者矣⑤. 吾尝用于时矣,而讫无称焉⑥. 乃以难强之筋骸,贪过分之荣禄,是将违其素志而自食其言A. ①③⑥B. ①②④C.②③⑤D.④⑤⑥8.下列对原文有关内容的理解或赏析,不正确的一项是()A. 作者结合自己一生的经历,从自己晚年更号“六一居士”的来由说起,叙说自己的爱好情趣以及渴望隐退的心情和对现实生活的厌倦。

B. 引用愚人欲自逃其影的典故是为了说明名是无法逃避的,也是为了引出欧阳修的态度——深知名不可逃,也并不想逃名,取名“六一”并不是矫情的表现。

高考英语二轮阅读理解限时训练精品题(6)及答案

高考英语二轮阅读理解限时训练精品题(6)及答案

2014高考英语二轮阅读理解限时训练精品题(6)及答案[文化教育型阅读理解(一)]A Practical English Grammar is intended for intermediate(中级的) and post-intermediate students. We hope that more advanced learners and teachers will also find it useful.The book is a comprehensive survey of structures and forms, written in clear modern English and illustrated with numerous examples. Areas of particular difficulty have been given special attention. Differences between conversational usage and strict grammatical forms are shown but the emphasis is on controversial forms.In the fourth edition, the main changes are as follows.1.Explanation and examples have been brought up to date.2.There is now more information on countable and uncountable nouns, attributive and predicative adjectives, adverbs of place, sentence adverbs, cleft sentences, prepositions, conjunctives, modal verbs, perfect tenses, infinitive constructions, the passive, purpose clauses.3.Some material has been rearranged to make comparisons easier. For example, parts of chapters on can, may, must,etc. are now grouped by functions; verbs of liking and preference have a chapter to themselves; suggestions and invitations have joined the chapter on commands, requests and advice.4.The content list now summaries every edition heading, and there is a new index containing many more entries references.In this edition, the sign “~” is frequently used to show a change of speaker in examples of dialogues. Note also says that although the sign “=”sometimes connects two words or expressions with the same meaning, it is often used more freely, e.g. to indicate a transformation from active to passive or direct to indirect speech.We wish to thank all at Oxford University Press who have assisted in the preparation of the fourth edition. We would also like to thank Professor Egawa of Nihon University, Japan, Professor Rene Dirven of Duisburg University, WestGermany and other colleagues for their friendly and helpful suggestions.1. The grammar book mentioned in this passage is not suitable for ________.A.a middle school teacherB.a primary school studentC.a senior high studentD.a college student2. According to the passage, we know that this grammar book________.A.compares modern English with old EnglishB.gives a large number of examples to reduce difficultyC.attaches more importance to conversational formsD.pays little attention to strict grammatical forms3. Which of the following statements about the changes is TRUE?A.This book keeps up with the latest usages of the American English language.B.This edition offers more information about pronouns.C.It's not easy for us to find the information we need in this book.D.One particular chapter discusses verbs like “care, like, love, hate, prefer, wish”.4. When you see this line in the book, “Did you get a ticket? ~Yes, I managed to get one”,we can understand that ________.A.the two parts before and after the sign “~” mean the sameB.the two parts before and after “~” are said by two different peopleC.the second speaker repeats what the first speaker saysD.the topic is changed in the part after the sign “~”5. In the last paragraph, the authors thank several people because________.A.they have helped the authors with this editionB.they have agreed to buy a lot of books from the authorsC.the authors want to make use of the fame of those peopleD.those people will make advertisements for this book【参考答案解析】A【要点综述】本文主要介绍了《实用英语语法》的特点及对它的第四版与之前版本主要不同的地方进行了介绍。

市鸽悉学校高考化学 从海水中获得的化学物质 第3单元 课后限时训练6 氧化还原反试题

市鸽悉学校高考化学  从海水中获得的化学物质 第3单元 课后限时训练6 氧化还原反试题

盘船州斜盒市鸽悉学校课后限时训练(六) 氧化还原反应(建议用时:45分钟)1.下列反应中,属于氧化还原反应的是( )A .Na 2O +H 2O===2NaOHB .CaCO 3=====高温CaO +CO 2↑C .Fe 2O 3+3CO=====高温2Fe +3CO 2D .NaOH +HCl===NaCl +H 2OC [本题考查氧化还原反应的特征。

反应前后有元素化合价发生改变的反应属于氧化还原反应。

]2.下列反应中,水作为还原剂的是( )A .2Na +2H 2O===2NaOH +H 2↑B .Cl 2+H 2O===HCl +HClOC .2F 2+2H 2O===4HF +O 2D .SO 2+H 2O===H 2SO 3C [反应2Na +2H 2O===2NaOH +H 2↑,H 2O 中的氢元素被还原,H 2O 为氧化剂,A 错误;反应Cl 2+H 2O===HCl +HClO 中,H 2O 中氢、氧元素的化合价均没有发生变化,H 2O 既不是氧化剂,也不是还原剂,B 错误;反应2F 2+2H 2O===4HF +O 2中,氟的化合价降低,而H 2O 中氧元素的化合价升高,氧元素被氧化,H 2O 作还原剂,C 正确;反应SO 2+H 2O===H 2SO 3不属于氧化还原反应,D 错误。

]3.下列盐酸参与的反应中,HCl 被氧化的是( )A .NaOH +HCl===NaCl +H 2OB .Fe +2HCl===FeCl 2+H 2↑C .CuO +2HCl===CuCl 2+H 2OD .MnO 2+4HCl(浓)=====△MnCl 2+Cl 2↑+2H 2OD [本题考查氧化还原反应。

A 和C 不属于氧化还原反应;B 中HCl 作氧化剂,被还原;D 中HCl 中部分Cl 由-1价被氧化生成0价。

]4.需加入适当的氧化剂才能实现的变化是( )A .PCl 3―→PB .MnO 2―→MnSO 4C .KI ―→KIO 3D .SO 2―→H 2SO 3C [氧化剂得电子,所含元素化合价降低,因此该变化过程中元素化合价升高,KI -1 ―→K I +5O 3,C 符合题意。

2021年深圳市中考数学18题限时训练(第6套)

2021年深圳市中考数学18题限时训练(第6套)

2021年深圳市中考数学18题限时训练(第6套)一、选择题1.在国家大数据战略的引领下,我国在人工智能领域取得显著成就,自主研发的人工智能“绝艺”获得全球最前沿的人工智能赛事冠军,这得益于所建立的大数据中心的规模和数据存储量,它们决定着人工智能深度学习的质量和速度,其中的一个大数据中心能存储58000000000本书籍,将58000000000用科学记数法表示应为()A.5.8×1010B.5.8×1011C.58×109D.0.58×10112.实数m,n在数轴上对应的点的位置如图所示,若mn<0,且|m|<|n|,则原点可能是()A.点A B.点B C.点C D.点D3.如果a﹣b=,那么代数式(﹣a)•的值为()A.﹣B.C.3D.24.若正多边形的内角和是540°,则该正多边形的一个外角为()A.45°B.60°C.72°D.90°5.在△ABC中,∠C=90°,sin A=,则cos B的值为()A.1B.C.D.6.如图,⊙O中,AD、BC是圆O的弦,OA⊥BC,∠AOB=50°,CE⊥AD,则∠DCE的度数是()A.25°B.65°C.45°D.55°7.已知关于x的分式方程﹣2=的解为正数,则k的取值范围为()A.﹣2<k<0B.k>﹣2且k≠﹣1C.k>﹣2D.k<2且k≠18.关于x的一元二次方程x2﹣4x+m=0的两实数根分别为x1、x2,且x1+3x2=5,则m的值为()A.B.C.D.09.二次函数y=ax2+bx+c的部分图象如图,图象过点A(3,0),对称轴为直线x=1,下列结论:①a﹣b+c=0;②2a+b=0;③4ac﹣b2>0;④a+b≥am2+bm(m为实数).其中正确的结论有()A.1个B.2个C.3个D.4个10.如图,在正方形ABCD中,对角线AC,BD交于点O,点E,F分别在AB,BD上,且△ADE≌△FDE,DE 交AC于点G,连接GF.得到下列四个结论:①∠ADG=22.5°;②S△AGD=S△OGD;③BE=2OG;④四边形AEFG是菱形,其中正确的结论有()A.1个B.2个C.3个D.4个二、填空题11.分解因式:2a﹣a2b=.12.当代数式有意义时,实数x的取值范围是.13.如图,△ABC内接于⊙O,若⊙O的半径为6,∠A=60°,则的长为.14.如图,抛物线y=x2﹣8x+15与x轴交于A、B两点,对称轴与x轴交于点C,点D(0,﹣2),点E(0,﹣6),点P是平面内一动点,且满足∠DPE=90°,M是线段PB的中点,连结CM.则线段CM的最大值是.15.如图,直线y=﹣x+6与反比例函数(k>0,x>0)的图象交于A、B两点,将该函数的图象平移得到的曲线是函数(k>0,x>0)的图象,点A、B的对应点是A′、B′.若图中阴影部分的面积为8,则k的值为三、解答题16.计算:+()﹣1﹣2cos45°﹣|2﹣3|.17.解不等式组,并求该不等式组的非负整数解.18.当前,“精准扶贫”工作已进入攻坚阶段,凡贫困家庭均要“建档立卡”.某初级中学七年级共有四个班,已“建档立卡”的贫困家庭的学生人数按一、二、三、四班分别记为A1,A2,A3,A4,现对A1,A2,A3,A4统计后,制成如图所示的统计图.(1)求七年级已“建档立卡”的贫困家庭的学生总人数;(2)将条形统计图补充完整,并求出A1所在扇形的圆心角的度数;(3)现从A1,A2中各选出一人进行座谈,若A1中有一名女生,A2中有两名女生,请用树状图表示所有可能情况,并求出恰好选出一名男生和一名女生的概率.2021年深圳市中考数学18题限时训练(第6套)一、选择题1.在国家大数据战略的引领下,我国在人工智能领域取得显著成就,自主研发的人工智能“绝艺”获得全球最前沿的人工智能赛事冠军,这得益于所建立的大数据中心的规模和数据存储量,它们决定着人工智能深度学习的质量和速度,其中的一个大数据中心能存储58000000000本书籍,将58000000000用科学记数法表示应为()A.5.8×1010B.5.8×1011C.58×109D.0.58×1011【分析】科学记数法的表示形式为a×10n的形式,其中1≤|a|<10,n为整数.确定n的值时,要看把原数变成a时,小数点移动了多少位,n的绝对值与小数点移动的位数相同.当原数绝对值≥10时,n是正数;当原数的绝对值<1时,n是负数.【解答】解:将580 0000 0000用科学记数法表示应为5.8×1010.故选:A.2.实数m,n在数轴上对应的点的位置如图所示,若mn<0,且|m|<|n|,则原点可能是()A.点A B.点B C.点C D.点D【分析】由若mn<0可知,m、n异号,所以原点可能是点B或点C,而又由|m|<|n|即可根据距离正确判断.【解答】解:∵mn<0∴m、n异号∴原点可能是点B或点C又由|m|<|n|,观察数轴可知,原点应该是点B.故选:B.【点评】本题考查的是绝对值的意义,利用数形结合的思想研究绝对值会让问题更加明确清晰,是一种常用的方法.3.如果a﹣b=,那么代数式(﹣a)•的值为()A.﹣B.C.3D.2【分析】先化简分式,然后将a﹣b=代入计算即可.【解答】解:原式===﹣(a﹣b),∵a﹣b=,∴原式=﹣,故选:A.4.若正多边形的内角和是540°,则该正多边形的一个外角为()A.45°B.60°C.72°D.90°【分析】根据多边形的内角和公式(n﹣2)•180°求出正多边形的边数,再根据多边形的外角和是固定的360°,依此可以求出正多边形的一个外角.【解答】解:∵正多边形的内角和是540°,∴多边形的边数为540°÷180°+2=5,∵多边形的外角和都是360°,∴正多边形的一个外角=360÷5=72°.故选:C.5.在△ABC中,∠C=90°,sin A=,则cos B的值为()A.1B.C.D.【分析】根据特殊角的三角函数值求解即可.【解答】解:∵△ABC中,∠C=90°,sin A=,∴∠A=60°,∠B=90°﹣∠A=30°.cos B=cos30°=.故选:B.6.如图,⊙O中,AD、BC是圆O的弦,OA⊥BC,∠AOB=50°,CE⊥AD,则∠DCE的度数是()A.25°B.65°C.45°D.55°【分析】由OA⊥BC,根据垂径定理的即可求得=,又由圆周角定理可求得∠D=∠AOB=×50°=25°,再由CE⊥AD,即可求得∠DCE的度数.【解答】解:∵OA⊥BC,∴=,∴∠D=∠AOB=×50°=25°,∵CE⊥AD,∴∠DCE=90°﹣∠D=65°.故选:B.7.已知关于x的分式方程﹣2=的解为正数,则k的取值范围为()A.﹣2<k<0B.k>﹣2且k≠﹣1C.k>﹣2D.k<2且k≠1【分析】根据分式方程的解法即可求出答案.【解答】解:∵=2,∴=2,∴x=2+k,∵该分式方程有解,∴2+k≠1,∴k≠﹣1,∵x>0,∴2+k>0,∴k>﹣2,∴k>﹣2且k≠﹣1,故选:B.8.关于x的一元二次方程x2﹣4x+m=0的两实数根分别为x1、x2,且x1+3x2=5,则m的值为()A.B.C.D.0【分析】根据一元二次方程根与系数的关系得到x1+x2=4,代入代数式计算即可.【解答】解:∵x1+x2=4,∴x1+3x2=x1+x2+2x2=4+2x2=5,∴x2=,把x2=代入x2﹣4x+m=0得:()2﹣4×+m=0,解得:m=,故选:A.9.二次函数y=ax2+bx+c的部分图象如图,图象过点A(3,0),对称轴为直线x=1,下列结论:①a﹣b+c=0;②2a+b=0;③4ac﹣b2>0;④a+b≥am2+bm(m为实数).其中正确的结论有()A.1个B.2个C.3个D.4个【分析】由抛物线过点A(3,0)及对称轴为直线x=1,可得抛物线与x轴的另一个交点,则可判断①②是否正确;由抛物线与x轴有两个交点,可得△>0,据此可判断③是否正确;由x=1时,函数取得最大值,可判断④是否正确.【解答】解:∵二次函数y=ax2+bx+c的图象过点A(3,0),对称轴为直线x=1,∴当x=﹣1时,y=0,即a﹣b+c=0.∴①正确;∵对称轴为直线x=1,∴﹣=1,∴b=﹣2a,∴2a+b=0,故②正确;∵抛物线与x轴有两个交点,∴△=b2﹣4ac>0,∴4ac﹣b2<0,故③错误;∵当x=1时,函数有最大值,∴a+b+c≥am2+bm+c,∴a+b≥am2+bm,故④正确.综上,正确的有①②④.故选:C.10.如图,在正方形ABCD中,对角线AC,BD交于点O,点E,F分别在AB,BD上,且△ADE≌△FDE,DE 交AC于点G,连接GF.得到下列四个结论:①∠ADG=22.5°;②S△AGD=S△OGD;③BE=2OG;④四边形AEFG是菱形,其中正确的结论有①③④.(填写所有正确结论的序号)A.1个B.2个C.3个D.4个【分析】由正方形的性质及△ADE≌△FDE,可判断①;证明△ADG≌△FDG(SAS),可判断②;通过全等三角形的性质及等腰三角形的判定可证得EF=GF=EA=GA,从而判定四边形AEFG是菱形,故④可判断;由△OGF为等腰直角三角形及△BFE为等腰直角三角形,可判断③.【解答】解:∵四边形ABCD是正方形,∴∠GAD=∠ADO=45°,∴由△ADE≌△FDE,可得:∠ADG=∠ADO=22.5°,故①正确;∵△ADE≌△FDE,∴AD=FD,∠ADG=∠FDG,又∵GD=GD,∴△ADG≌△FDG(SAS),∴S△AGD>S△OGD,故②错误;∵△ADE≌△FDE,∴EA=EF,∵△ADG≌△FDG,∴GA=GF,∠AGD=∠FGD,∴∠AGE=∠FGE.∵∠EFD=∠AOF=90°,∴EF∥AC,∴∠FEG=∠AGE,∴∠FGE=∠FEG,∴EF=GF,∴EF=GF=EA=GA,∴四边形AEFG是菱形,故④正确;∵四边形AEFG是菱形,∴AE∥FG,∴∠OGF=∠OAB=45°,∴△OGF为等腰直角三角形,∴FG=OG,∴EF=OG,∵△BFE为等腰直角三角形,∴BE=EF=×OG=2OG,∴③正确.综上,正确的有①③④.故答案为:①③④.二、填空题11.分解因式:2a﹣a2b=a(2﹣ab).【分析】直接提取公因式a,进而分解因式得出答案.【解答】解:2a﹣a2b=a(2﹣ab).故答案为:a(2﹣ab).12.当代数式有意义时,实数x的取值范围是x≥﹣8.【分析】根据二次根式有意义的条件得出8+x≥0,求出即可.【解答】解:∵代数式有意义,∴8+x≥0,解得:x≥﹣8,故答案为:x≥﹣8.13.如图,△ABC内接于⊙O,若⊙O的半径为6,∠A=60°,则的长为4π.【分析】连接OB,OC,根据∠A=60°,可得∠BOC=120°,然后根据弧长公式计算即可.【解答】解:连接OB,OC,∵∠A=60°,∴∠BOC=120°,则===4π.故答案为:4π.14.如图,抛物线y=x2﹣8x+15与x轴交于A、B两点,对称轴与x轴交于点C,点D(0,﹣2),点E(0,﹣6),点P是平面内一动点,且满足∠DPE=90°,M是线段PB的中点,连结CM.则线段CM的最大值是()【分析】解方程x2﹣8x+15=0得A(3,0),利用抛物线的性质得到C点为AB的中点,再根据圆周角定理得到点P在以DE为直径的圆上,圆心Q点的坐标为(﹣4,0),接着计算出AQ=5,⊙Q的半径为2,延长AQ交⊙Q于F,此时AF的最大值为7,连接AP,利用三角形的中位线性质得到CM=AP,从而得到CM的最大值.【解答】解:解方程x2﹣8x+15=0得x1=3,x2=5,则A(3,0),∵抛物线的对称轴与x轴交于点C,∴C点为AB的中点,∵∠DPE=90°,∴点P在以DE为直径的圆上,圆心Q点的坐标为(﹣4,0),AQ==5,⊙Q的半径为2,延长AQ交⊙Q于F,此时AF最大,最大值为2+5=7,连接AP,∵M是线段PB的中点,∴CM为△ABP为中位线,∴CM=AP,∴CM的最大值为.15.如图,直线y=﹣x+6与反比例函数(k>0,x>0)的图象交于A、B两点,将该函数的图象平移得到的曲线是函数(k>0,x>0)的图象,点A、B的对应点是A′、B′.若图中阴影部分的面积为8,则k的值为5【分析】图象向上平移了2个单位,即BB′=2,由图象平移知,阴影部分的面积等于平行四边形ABB′A的面积,点A、B两点间的距离为h,则h×BB′=8,求出h=4,进而求解;【解答】解:平移后曲线是函数=+2,即图象向上平移了2个单位,即BB′=2,由图象平移知,阴影部分的面积等于平行四边形ABB′A的面积,点A、B两点间的距离为h,则h×BB′=8,解得:h=4,∵直线y=﹣x+6与x轴负半轴的夹角为45°,则A、B之间的垂直距离也为4,设点A(m,6﹣m),则点B(m+4,2﹣m),将点A、B的坐标代入反比例函数表达式得:k=m(6﹣m)=(m+4)(10﹣m),解得:m=1,k=5,故答案为5.三、解答题16.计算:+()﹣1﹣2cos45°﹣|2﹣3|.【分析】直接利用负指数幂的性质以及特殊角的三角函数值、绝对值的性质分别化简得出答案.【解答】解:+()﹣1﹣2cos45°﹣|2﹣3|=3+5﹣2×﹣(3﹣2)=3+5﹣﹣3+2=4+2.17.解不等式组,并求该不等式组的非负整数解.【分析】分别求出每一个不等式的解集,根据口诀:同大取大、同小取小、大小小大中间找、大大小小无解了确定不等式组的解集.【解答】解:解不等式3(x+2)≥x+4,得:x≥﹣1,解不等式<1,得:x<3,∴原不等式解集为﹣1≤x<3,∴原不等式的非负整数解为0,1,2.18.当前,“精准扶贫”工作已进入攻坚阶段,凡贫困家庭均要“建档立卡”.某初级中学七年级共有四个班,已“建档立卡”的贫困家庭的学生人数按一、二、三、四班分别记为A1,A2,A3,A4,现对A1,A2,A3,A4统计后,制成如图所示的统计图.(1)求七年级已“建档立卡”的贫困家庭的学生总人数;(2)将条形统计图补充完整,并求出A1所在扇形的圆心角的度数;(3)现从A1,A2中各选出一人进行座谈,若A1中有一名女生,A2中有两名女生,请用树状图表示所有可能情况,并求出恰好选出一名男生和一名女生的概率.【分析】(1)根据A3的人数除以A3所占的百分比即可求出总人数.(2)根据A1的人数的所占的百分比即可取出圆心角的度数.(3)列出树状图即可求出答案.【解答】解:(1)总数人数为:6÷40%=15人(2)A2的人数为15﹣2﹣6﹣4=3(人)补全图形,如图所示A1所在圆心角度数为:×360°=48°(3)画出树状图如下:故所求概率为:P==。

南昌市2021高考英语二轮阅读明白得限时训练精品题(6)(1)

南昌市2021高考英语二轮阅读明白得限时训练精品题(6)(1)

南昌市2021高考英语阅读明白得二轮限时训练精品题(6)及答案【深圳市2021高考英语综合能力测试题(5)】CIt was a beautiful summer afternoon. I happened to be at a local Walmart picking up some stuff for my wife when I laid my eyes on two young ladies. They were walking confidently, with their heads held high, which made me believe that they were involved in some kind of competitive sport. They were wearing T-shirts, at the back of which printed, "Pain is temporary, but pride is forever." Thinking of these words, I automatically said to myself, "That's right! No pain, no gain."Whatever is worth having is worth fighting for, and with fight, there comes pain! Fortunately, pain is just temporary. However, it is a necessary step you need to take to get your gain.Athletes and their coaches understand this so well. They spend so many hours and so much effort preparing for a competition. Some will think about giving up when the training is so painful, but coaches are there to remind them that "quitters never win and winners never quit".. So they know that when victory comes, they will be proud of themselves and that pride can last a lifetime.You've probably heard the saying, "There's no such thing as a free lunch." Well, it is true. Everything in life has a price, whether you agree or not. To want something for free will always lead to deception. Even if you get it, you will not value it or enjoy it, because it is free.No one has told you that life is easy! In fact it is a series of struggles and fights. You will achieve what other people call "impossible" only when you are willing to endure pain and overcome fear and doubt. Your achievement in life is in direct proportion to how much sacrifice you are willing to make.Successful people are usually and wrongly labeled as lucky or highly favored by circumstances. However, if you hear their personal stories, you will realize that they went through a lot of trials, but still kept on going, enduring the pain to make where they are today. If we understand that every effect has its cause, then we will grasp the fact that we do have a chance to influence the outcome we get in life.36. According to the passage, which of the following statements is TRUE?A. Athletes are too proud to give up.B. Gain is necessary for getting your pain.C. If you get something free, you will not treasure it.D. The author noticed the two ladies because they were having a competition.37. What can we learn from Paragraph 5?A. Life is short.B. Life is meaningful.C. Life is colorful.D. Life is tough.38. From the last paragraph we know that_________.A. success comes from perseveranceB. success comes from taking risks or chancesC. successful people are often looked down uponD. successful people are never regarded as lucky dogs39. Which part of a website is the passage probably taken from?A. Culture.B. Education.C. Sports.D. Entertainment.40. What's the best title for the passage?A. No pain, no gain.B. Pride is forever.C. Pain is temporary.D. Successful people are lucky.【参考答案】36-40 CDABA伤痛是短暂的,荣耀是永久的。

2019中考数学限时训练:课时6分式方程的解法及应用(有答案)

2019中考数学限时训练:课时6分式方程的解法及应用(有答案)

课时6分式方程的解法及应用(时间:30分钟满分:32分)评分标准:选择填空每题3分.基础过关1 21•将分式方程x=三去分母后得到的整式方程是()A . x- 2 = 2x 2B . x —2x= 2xC. x —2 = x D . x= 2x—42 32 .分式方程---- ;=-的解为()x—3 xA . x= 0 C. x = 5B . x= 3D . x= 92 33.关于x的分式方程2+二T0的解为x=4,则常数a的值为(A . 1C . 41 44 . (2018广州)方程-=一的解是x x+ 6 B . 2 D.105 . (2018嘉兴)甲、乙两个机器人检测零件,甲比乙每小时多检测20个,甲检测300个比乙检测200个所用的时间少10%.若设甲每小时检测x个,则根据题意,可列出方程:_______________________6 . (6分)解分式方程:(1)2= 1; (2) 2x+ 5= 3.7 . (8分)(2018玉林)山地自行车越来越受中学生的喜爱.一网店经营的一个型号山地自行车,今年一月份销售额为30 000元,二月份每辆车售价比一月份每辆车售价降价100元,若销售的数量与上一月销售的数量相同,则销售额是27 000元.(1)求二月份每辆车售价是多少元?(2)为了促销,三月份每辆车售价比二月份每辆车售价降低了10%销售,网店仍可获利35%,求每辆山地自行车的进价是多少元?拓展提升x kk的取值范围为1. (2018眉山)已知关于x的分式方程 =—2== 有一个正数解,则X 3 X 3参考答案:基础过关 1.A 2.D 3.D 4.x = 2 5.300^^^ X (1 —10%) xx — 206.解:(1)去分母,得2x — 4= x ,解得x = 4.检验:当x = 4时,x 丰0, x — 2丰0.x = 4是分式方程的解.1(2)去分母,得 2x — 5 = 3(2x — 1),解得 x = — ^.1检验:当x =— 1时,2x — 1 = — 2工0.1••• x =—2是分式方程的解.7.解:(1)设二月份每辆车售价为 x 元,则一月份每辆车售价为 解得x = 900.经检验,x = 900是原分式方程的解.答:二月份每辆车售价是 900元.(2)设每辆山地自行车的进价为 y 元.根据题意,得 900X (1— 10%) — y = 35%y , 解得y = 600. 答:每辆山地自行车的进价是 600元.拓展提升 1.k v 6且k z 3 根据题意,得 30 000 x + 100 27 000(x + 100)元.。

限时训练各环节要求

限时训练各环节要求

限时训练各环节要求一、听力训练要求听力训练是提高听力水平的重要环节,需要注意以下要求:1. 注意力集中:在听力训练过程中,要保持专注,全神贯注地聆听。

避免分心或走神,以免错过关键信息。

2. 记笔记与标记:可以使用纸笔记录关键信息,如人名、地名、数字等。

也可以在听力材料上做标记,以便后续回答问题。

3. 掌握关键词汇:在听力材料中,会出现一些关键词汇,掌握这些词汇对于理解整个内容非常重要。

可以提前准备这些词汇,以便更好地理解听力材料。

4. 练习听力速度:在日常训练中,可以逐渐提高听力速度。

开始时可以选择较慢的听力材料,逐渐过渡到正常速度的听力材料。

这样可以提高听力反应能力。

二、阅读训练要求阅读训练是提高阅读理解能力的重要环节,需要注意以下要求:1. 熟悉题型:不同题型的阅读理解有不同的解题思路。

在训练过程中,要熟悉各类题型的解题方法,以便更好地完成题目。

2. 词汇积累:阅读理解中经常出现一些生词或难词,掌握这些词汇对于理解文章非常重要。

可以通过背单词、阅读英文材料等途径进行词汇积累。

3. 理解文章结构:阅读理解文章通常有一定的结构,如引言、主体、结论等。

在阅读过程中,要注意把握文章的整体结构,以便更好地理解文章的意思。

4. 时间控制:阅读理解题目往往较多,时间有限。

在训练过程中,要掌握好时间,合理安排解题顺序,避免因时间不足而影响答题效果。

三、写作训练要求写作训练是提高写作能力的重要环节,需要注意以下要求:1. 提纲思维:在写作前,可以先列出写作的提纲,明确文章的结构和内容。

这样可以更好地组织思路,使文章逻辑清晰。

2. 语言表达:在写作过程中,要注意语言的准确性和丰富性。

可以使用各种句型和词汇,使文章更具表达力和可读性。

3. 文章结构:写作要注意文章的结构,包括引言、主体和结论。

可以使用适当的段落和标题,使文章结构清晰,易于阅读。

4. 语法和拼写:写作过程中要注意语法和拼写的准确性。

可以多多练习语法和拼写,以避免错误和歧义。

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限时训练6I.单项选择21. To my father, there's no greater happiness than ________ of succeeding in his career.A. itB. oneC. thatD. the one22. As Charles Darwin wrote in The Descent of Man, “The highest possible stage in moral culture is ________ we recognize that we ought to control our minds.”A. thatB. howC. whereD. when23. However difficult it seems to be, you will make it ________ you put your heart into it.A. so thatB. as thoughC. as long asD. in that24. Just as Martin Luther King, Jr. said, peace is not merely a distant goal that we seek, but a means________ we arrive at that goal.A. in whichB. with whichC. by whichD. to which25. This sustainable development needs to be different from past development, which ________ thepollution of the environment and waste of natural resources.A. causedB. will causeC. had causedD. causes26. _____ on the cyberspace issue in a speech at a welcoming dinner in Seattle, Xi Jinping called on all countries to cooperate and draw up Internet policies corresponding with their national conditions.A. TouchedB. TouchingC. TouchD. To touch27. A biblical idiom is often an expression that ________ the moral of a story and gives the audience apicture to help them understand the story better.A. underlinesB. assessesC. substitutesD. fascinates28. The ________ of cultures between Europeans and the Romany led to many nations taking actionagainst them.A. cooperationB. similarityC. conventionD. collision29. Journalists are evenly split on whether or not they should interview their personal heroes: some say you shouldn't because you'll find your idol has ________,while others argue the opportunity is too good to miss.A. butterflies in his stomachB. a green fingerC. feet of clayD. a wet blanket30. We welcome you to use this area for your baby buggy(童车). However, ________ a wheelchair user board the bus, you are not supposed to use this special area.A. wouldB. mightC. shouldD. could31. The next train to arrive at Platform One will be the 10:58 Abellio Greater Anglia service to London Liverpool Street, calling ________ Ingatestone, Shenfield, Stratford and London Liverpool Street.A. onB. offC. forD. at32. It is amazing how quickly the idea “The world is so big and I warn to see it” ________ throughout the country and everybody seemed to be talking about it.A. caught onB. hung onC. went onD. carried on33. When a child is ________ to peanuts, families must closely monitor everything the child eats both in and outside the home, because accidental consumption of peanuts could cause death.A. allergicB. addictiveC. accustomedD. apparent34. According to the news report, France has decided to expand government's security powers ________ Paris attacks.A. in search ofB. in the wake ofC. in memory ofD. in the case of35. _____ ? Your dog can get jealous when you pay attention to other dogs, other people or even other things.A. Guess whatB. How comeC. What's upD. Why notII.完形填空It gives me a great pleasure to join you for this important initiative(倡议) as the UN __36__ its 70th anniversary.Education is very__37__ in my heart. My father__38__in a very small village in China. In those days, not many villagers could read. So my father opened a night school to teach them how to __39__.As his daughter, I know what education__40__to the people, especially those without it. After generations of hard work,China has come a long way in education. I myself am a beneficiary(受益者) of that progress.__41__I would never become a professor of musical.I am following my father's__42__by teaching at China's Conservatory of Music to help__43__China's success story. I want to thank Director-General Bokova and UNESCO for__44__me the Special Envoy(特使) for Women and Girls Education. I am truly honored to work with the UN and do something about Global Education.Education is about__45__and girls. It is important for girls to go to school__46__they will become their children's first teacher someday. But women still__47__over half of the world's poor in population and 60% of adults who can't read.Education is crucial(of extreme importance) in addressing such__48__. In China, Spring Bud Education Program has helped over 3 million girls go back to school. Many of them have__49__university education and they are doing well at work.Education is about equality. In poor countries and regions the number of school dropouts is_50__. We call for more educational resources to these places.Education is about the young people. Young people are the _51__. Education is important because it not only gives young people knowledge and skills but also helps them become responsible citizens. As the UNESCO special envoy and the mother myself, my__52__to education for all will never change.Many years ago my father made a small__53__in his village. Together we can make a big difference in the world. I was once asked about my Chinese dream. I said I hope all children especially girls can have__54__to good education. This is my Chinese dream. I believe one day Education First will no longer be a dream. It will be a reality__55__by every young woman on this planet.36. A. symbolizes B. memorizes C. represents D. marks37. A. controversial B. painful C. close D. distant38. A. grew up B. came up C. picked up D. turned up39. A. read B. write C. study D. speak40. A. shows B. means C. suggests D. owes41. A. Other wise B. Nevertheless C. Moreover D. Likewise42. A. footsteps B. suggestions C. customs D. fashions43. A. continue B. start C. inspire D. achieve44. A. evaluating B. naming C. listing D. employing45. A. women B. boys C. citizens D. adults46. A. while B. when C. unless D. because47. A. make for B. take for C. account for D. sacrifice for48. A. drawbacks B. weaknesses C. inequalities D. emergencies49. A. finished B. withdrawn C. confirmed D. undertaken50. A. declining B. astonishing C. balancing D. rewarding51. A. core B. wealth C. future D. glory52. A. concentration B. commitment C. consistency D. conservation53. A. effect B. progress C. impact D. difference54. A. access B. way C. right D. privilege55. A. appreciated B. blessed C. enjoyed D. deserved III. 任务型阅读Your life is composed of all the little things we experience every day, and knowing how to find joy in some of those little things is one of the easiest ways to let happiness slowly fill your cup. In order for that to happen, you need to do two very simple things: put yourself in such situations that you can experience happiness there, and then find a way to savour the experience and let it sink into you.To put yourself in the position of experiencing happiness every day, Lahna Catalino, Ph.D., at the University of California, San Francisco, recommends an approach called “prioritizing positivity”—organizing your day­to­day life on purpose so that it contains situations which naturally give rise to positive emotions. It involves both carving out time in your daily routine to do things that you really love and heavily weighing the positive emotional consequences of major life decisions, like taking a new job, and you will regularly find yourself.Then how can we find a way to savour the happy experience and let it sink into you? Here is what psychologist Rick Hanson, the author of Buddha's Brain explains.Let a good fact become a good experience.Often we go through life and some good thing happens—a little thing, like we checked off an item on our To Do list, w e survived another day at work, the flowers are blooming, and so forth. Hey, this is an opportunity to feel good. Don't leave money lying on the table: Recognize that this is an opportunity to let yourself truly feel good.Really enjoy this positive experience.Practice what any school teacher knows: If you want to help people learn something, make it as intense as possible—in this case, as felt in the body as possible—for as long as possible.When sinking into this experience, sense your intention that this experience is sinking into you.Sometimes people do this through visualization, like by sensing a golden light coming into themselves or a soothing balm inside themselves. You might imagine a jewel going into the treasure chest in your heart—or just know that this experience is sinking into you, becoming a resource you can take with you no matter where you go.It might seem a little cliche(陈词滥调) to say “stop and smell the roses,”but it's moments like those that can be stored in your happiness bank and withdrawn later. Living a happy life can be assimple as accepting the happiness that's already around you. If you want more, it's ok to go out andReally enjoy the positive experience as long as possib。

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