步步高答案解析

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《步步高》教学辅导电子版,有习题,有解析,第五章物质结构元素周期律

第五章物质结构元素周期律第13讲原子结构1.（2009·成都模拟）铋（Bi ）在医药方面有重要应用。

下列关于20983Bi 和21083Bi 的说法正确的是 ( )A.20983Bi 和21083Bi 都含有83个中子B.20983Bi 和21083Bi 互为同位素C.20983Bi 和21083Bi 的核外电子数不同D.20983Bi 和21083Bi 分别含有126和127个质子答案 B2.(2008·全国理综Ⅱ,11)某元素的一种同位素X 的质量数为A ，含N 个中子，它与1H 原子组成H m X 分子。

在a g H m X 中所含质子的物质的量是（） A.m A +2(A-N+m ) molB.A a(A-N) mol C.mA a+(A-N) molD. Aa (A-N+m ) mol答案 A3.（2009·商丘模拟）某元素原子的最外层电子数是次外层的a 倍（a >1)，则该原子的核内质子数是 ( ) A.2a +2 B.2a +10 C.a +2 D.2a答案 A4.(2008·上海，2)化学科学需要借助化学专用语言来描述，下列有关化学用语正确的是 ( )A. CO 2的电子式为B.Cl -的结构示意图为C.乙烯的结构简式为C 2H 4D.质量数为37的氯原子为1737Cl 答案 B5.（2009·长春模拟）下列叙述正确的是（） A.聚丙烯的结构简式为：B.石英的化学式为：CaSiO 3C.在CS 2、PCl 3中各原子最外层均能达到8电子的稳定结构D.Ar 原子的结构示意图为：答案 C6.下图为四种粒子的结构示意图，完成以下填空：A. B. C. D.（1）属于阳离子结构的粒子是。

（2）B 粒子的半径 C 粒子的半径（填“大于”“小于”或“等于”）。

（3）某元素R 形成的氧化物为R 2O 3，则R 的原子结构示意图可能是。

2020步步高苏教版高三一轮复习数列含答案解析

项数有限项数无限
按项与项间的大小关系分类
递增数列递减数列
常数列
摆动数列
an＋1__>__an
an＋1__<__an
其中 n∈N*
an＋1＝an
从第 2 项起，有些项大于它的前一项，
有些项小于它的前一项的数列
3.数列的表示法数列有三种表示法，它们分别是列表法、图象法和解析式法． 4．数列的通项公式如果数列{an}的第 n 项与序号 n 之间的关系可以用一个公式来表示，那么这个公式叫做这个数列的通项公式．
考试内容数列的概念等差数列等比数列
等级要求 A C C
§6.1 数列的概念与简单表示法
考情考向分析以考查 Sn 与 an 的关系为主，简单的递推关系也是考查的热点．本节内容在高考中以填空的形式进行考查，难度为低档．
1．数列的定义
按照一定次序排列的一列数称为数列，数列中的每一个数叫做这个数列的项．
2，n＝1，答案
2n－1，n≥2，n∈N*
解析当 n＝1 时，a1＝S1＝2，当 n≥2 时，
an＝Sn－Sn－1＝n2＋1－[(n－1)2＋1]＝2n－1，
又 a1＝2 不满足 an＝2n－1，
2，n＝1，故 an＝ 2n－1，n≥2，n∈N*.
题型一由数列的前几项求数列的通项公式例 1 根据下面各数列前几项的值，写出数列的一个通项公式： (1)2，4 ，6 ，8 ，10，…；
2．数列的分类
分类原则
类型
满足条件
按项数分类
有穷数列无穷数列
项数有限项数无限
按项与项间的大小关系分类
递增数列递减数列
常数列
摆动数列
an＋1__>__an

[精编]高中古诗词阅读鉴赏步步高(全)答案解析共50题

[精编]高中古诗词阅读鉴赏步步高(全)答案解析共50题1．阅读下面这首唐诗，完成下面小题。

谪岭南道中作李德裕岭水争分路转迷，桄榔椰叶暗蛮溪①。

愁冲毒雾逢蛇草，畏落沙虫避燕泥。

五月畲田②收火米，三更津吏报潮鸡③。

不堪肠断思乡处，红槿花中越鸟啼。

（注）①蛮溪；泛指岭南的溪流。

②畲田：用火烧掉田地里的草木，然后耕田种植。

③三更津吏报潮鸡：《舆地志》说：“移风县有鸡……每潮至则鸣，故称之‘潮鸡’。

”三更潮汛到来的时候，鸡就会叫，津吏就把这消息通知旅行的人。

1．下列对这首诗的赏析，不正确的一项是（）A．首联“争分”写出了岭水分流的态势，“暗”字表现了桄榔椰叶的茂密。

B．颔联写诗人怕毒雾、蛇草，避沙虫、燕泥，写出了途中提心吊胆的情状。

C．颈联以五月收获稻米、三更时津吏就报潮汛到来表现了岭南人们的勤劳。

D．全诗写景抒情互相交替，显得灵活多变而不呆滞，景中寓情，情中有景。

2．请简要赏析本诗的末句“红槿花中越鸟啼”。

【答案】1．C2．①本句写红槿花开，越鸟在花丛中啼鸣，描绘了一幅艳丽的岭南风景图。

②本句以乐景衬哀情。

景色越美，诗人被贬的苦闷之情和对家乡的思念之意就更显得浓重。

③本句以景结情，能够引发读者的联想和想象，显得意犹未尽，耐人深思。

④本句视听结合，使画面充满立体感，生动形象。

（答出其中三点且意思对即可。

）【分析】1．本题考查学生分析理解诗歌内容及手法的能力。

C．颈联两句的意思是“五月间岭南已经在收获稻米，三更潮汛到来的时候，鸡就会叫，津吏就把这消息通知旅行的人。

这两句并非在表现岭南人们的勤劳，而是在表现岭南与北方不同，并为尾联抒发诗人被谪贬瘴疠之地的深切思乡之情作铺垫。

故选C。

2．本题考查学生鉴赏诗歌炼句的能力。

诗的最后一句“红槿花中越鸟啼”是一句写景句，描写了看着那鲜艳欲滴的红槿花，听着那树上越鸟的鸣叫，这是一幅典型艳丽的岭南风景图。

作者此处写岭南美景并非是为眼前景色所陶醉，而是写岭南的风物与自己北方的故乡的不同，此处表面上是写岭南美景，其实是以乐景衬哀情，景色越美，诗人被贬的苦闷之情和对家乡的思念之意就更显得浓重。

2025高考语文步步高大一轮复习讲义教材文言文点线面选择性必修中册(二) 单篇梳理4 过秦论含答案

2025高考语文步步高大一轮复习讲义教材文言文点线面选择性必修中册(二)单篇梳理4过秦论含答案复习重点 1.积累并记牢“过”“乘”“遗”“策”“顾”“负”“盛”等重要词语。

2.背诵两文，翻译重点句子。

3.掌握判断句的特点及辨析方法。

单篇梳理4过秦论通读全文，解释加点的词语。

(第1段)秦孝公据崤函之固，拥雍州之地，君臣固守以窥周室，有席卷天下，包举宇内，囊括四海之意，并吞八荒之心。

当是时也，商君佐之，内立法度，务．①()耕织，修守战之具．②()，外连衡而斗诸侯。

于是秦人拱手．．③()而取西河之外。

(第2段)孝公既没，惠文、武、昭襄蒙．①()故业，因．②()遗策，南取汉中，西举．③()巴、蜀，东割膏腴之地，北收要害之郡。

诸侯恐惧，会盟而谋弱秦，不爱．④()珍器重宝肥饶之地，以致．⑤()天下之士，合从缔交，相与．．⑥()为一。

当此之时，齐有孟尝，赵有平原，楚有春申，魏有信陵。

此四君者，皆明智而忠信，宽厚而爱人，尊贤而重士，约从离衡，兼韩、魏、燕、楚、齐、赵、宋、卫、中山之众。

于是六国之士，有甯越、徐尚、苏秦、杜赫之属为之谋，齐明、周最、陈轸、召滑、楼缓、翟景、苏厉、乐毅之徒通其意，吴起、孙膑、带佗、倪良、王廖、田忌、廉颇、赵奢之伦制其兵。

尝以十倍之地，百万之众，叩关而攻秦。

秦人开关延．⑦()敌，九国之师，逡巡而不敢进。

秦无亡矢遗镞．⑧()之费．⑨()，而天下诸侯已困矣。

于是从散约败，争割地而赂秦。

秦有余力而制其弊．⑩()，追亡逐北．⑪()，伏尸百万，流血漂橹；因利乘便，宰割天下，分裂山河。

强国请服，弱国入朝。

延及孝文王、庄襄王，享国之日浅，国家无事。

(第3段)及至始皇，奋．①()六世之余烈．②()，振．③()长策而御．④()宇内，吞二周而亡诸侯，履至尊而制六合．．⑤()，执敲扑而鞭笞．⑥()天下，威振四海。

南取百越之地，以为桂林、象郡；百越之君，俯首系颈，委．⑦()命下吏。

乃使蒙恬北筑长城而守藩篱，却匈奴七百余里；胡人不敢南下而牧马，士不敢弯弓而报怨．⑧()。

高一物理步步高分层训练答案必修一2020

高一物理步步高分层训练答案必修一20201.两列火车平行地停在一站台上，过了一会，甲车内的乘客发现窗外树木在向西移动，乙车内的乘客发现甲车没有动，如以地面为参考系，上述事实说明 [单选题] *A. 甲车向东移动，乙车不动B. 乙车向东运动，甲车不动C. 甲车向东运动，乙车向西运动D. 甲、乙两车以相同的速度向东运动(正确答案)答案解析：【答案】D【解析】甲车乘客看到树木向西移动，甲车乘客是以甲车为参照物，则树木是西运动的，则甲车相对于静止的地面来说是向东运动的；而乘客看到乙车未动，即甲、乙两车处于相对静止状态，由于甲车是向东运动的，即乙车相对于地面也是向东运动的．故选D2.关于质点，下列说法是否正确() [单选题] *A. 质点是指一个很小的物体B. 在研究汽车的运动轨迹时汽车不可以被看成质点C. 无论物体的大小，在机械运动中都可以看作质点D. 质点是对物体的科学抽象，是理想化模型(正确答案)答案解析：【答案】D【解析】【分析】质点是只计质量、不计大小、形状的一个点，是实际物体在一定条件的科学抽象，能否看作质点物体本身无关，要看所研究问题的性质，看物体的形状和大小在所研究的问题中是否可以忽略．【详解】很小的物体它的体积不一定能够忽略，不一定能看成质点，如原子很小，在研究原子内部结构的时候是不能看成质点的，故A错误．在研究行驶中汽车的运动轨迹时，不考虑汽车的具体形状，故汽车可以看作质点；只有物体的满足条件后才能看作质点；并不是都可以看作质点；故C错误；质点是一种科学的抽象，生活中并不存在；故D正确；故选BD．3.一个小球从4m高处落下，被地面弹回，在1m高处被接住，则小球在整个过程中 [单选题] *A. 位移是5mB. 路程是5m(正确答案)C. 位移大小是1mD. 以上均不对答案解析：【答案】B【解析】小球从4m高处自由落下，被地面弹回，在1m高处被接住．由于路程等于运动轨迹的长度，所以s=4+1m=5m．位移的大小等于首末位置的距离，大小为3m．故ACD错误，B正确．故选B．4.关于速度的说法正确的是( ) [单选题] *A. 速度与位移成正比B. 平均速率等于平均速度的大小C. 匀速直线运动任何一段时间内的平均速度等于任一点的瞬时速度(正确答案)D. 瞬时速度就是运动物体在一段较短时间内的平均速度答案解析：【答案】C【解析】速度采用了比值定义法，速度等于位移与时间的比值，但不与位移成正比，A错误；平均速率等于路程与时间的比值；而平均速度是位移与时间的比值，B错误；匀速直线运动中速度保持不变；故任何一段时间内的平均速度等于任一点的瞬时速度，C正确；瞬时速度可以用运动物体在一段较短时间内的平均速度来代替近似求解；但不能说平均速度就是瞬时速度；故D错误．5.物体沿一条直线运动，下列说法中正确的有 [单选题] *A. 物体在某时刻的速度为3 m/s，则物体在1 s内一定走3 mB. 物体在某1 s内的平均速度是3 m/s，则物体在这1 s内的位移一定是3 m(正确答案)C. 物体在某段时间内的平均速度是3 m/s，则物体在1 s内的位移一定是3 mD. 物体在某段位移内的平均速度是3 m/s，则物体某1 s内的位移不小于3 m答案解析：.【答案】B【解析】试题分析：物体在某时刻的速度为3m/s，由于物体不一定做匀速直线运动，则物体在1s内的位移不一定为3m，故A错误．物体在某1s内的平均速度是3m/s，根据x=vt知，物体在这1s内的位移一定是3m，故B正确．物体在某段时间内的平均速度为3m/s，则某1s内的平均速度不一定为3m/s，则位移不一定是3m，故C错误．6、[单选题] *ABC(正确答案)D答案解析：7、[单选题] * ABC(正确答案) D答案解析：7.【答案】c【解析】A、物体A的运动是以10m/s的速度匀速运动，A正确；B、物体B的运动是先以5m/s的速度与A同方向，后静止，最后反向运动，故B正确；C、物体B在最初3s内位移是0，故C错误；D、物体B在最初3s内路程是：1×5+1×5=10m，D正确．故选c．8、[单选题] *AB(正确答案)CD答案解析：【答案】B【解析】【分析】力的合成遵循平行四边形定则，三力合成可以先合成其中两个力，再与第三个力合成，也可用正交分解法先分解再合成．【详解】对甲，先将F1与F3合成，然后再用勾股定理，与F2进行合成，求得合力等于5 N，故A错误；对乙，先将F1与F3沿水平和竖直方向正交分解，再合成，求得合力等于5 N，故B正确；对丙，可将F3沿水平和竖直方向正交分解正交分解，求得合力等于6 N，故C错误；根据三角形法则，丁图中合力等于0，故D错误；故选B。

2023年步步高新教材教材文言文点线面语文答案

2023年步步高新教材教材文言文点线面语文答案答案：1、D(“全部是歌颂”错，原文“歌颂为主”“劝百讽一”)2、A(“文人的鸿篇巨制绝迹”错，原文“文人鸿篇巨制形式的大赋作品逐渐减少”)3、C(“写作汉大赋的作家地位较高”，错，原文“汉代经学盛行，辞赋家的地位低下”)4、B命题透析：此题主要考查文言文断句能力、要求选择正确的断句项、答案选B。

思路点拨：断句的方法很多，比如虚词标志法，句意断句法等等、但是作为人物传记中的叙述语句，最好先抓人物事件，这句话主要讲傅珪参与修撰，因此而被降职和升官的历程，意思是：“说《会典》成于刘健等人，靡费很多，降参与修撰者的官，傅珪降为修撰，不久因《孝宗实录》修成，晋升左中允，再次晋升至翰林学士，历任吏部左、右侍郎、”然后做语法分析，即可得到答案、同时选择题，可以比对排除、所以选B。

5、A、命题透析：此题文言中的文化常识，题目比较简单、要求选择不正确项、答案选A。

思路点拨：四个选项涉及的文化常识都是常见的，仔细辨析即可得到答案、选A、A项中“土地、户籍”等职事归户部掌管。

6、C命题透析：此题主要考查文言文本的内容理解和概括、分析的能力、选择错误项、答案选C。

思路点拨：C项“后因得罪权贵被迫退休”错误，原文是“遂矫旨令二人致仕”即“(权贵)假托皇上诏命，让两个人辞去官职”需要对照原文，并对原文相应语句做翻译，错误往往在细微处。

7、(1)命题透析：此题主要考查文言文本的内容理解和语言表达能力、答案是：极力奏陈其时社会弊病十件事，话语多指斥受宠的权贵，权贵愈加痛恨他。

思路点拨：译出大意给3分，“权幸”“嫉” 两处，每译对一处给1分、本句比较简单，翻译中注意通顺即可、权幸，权指权贵，幸指宠幸，这里是被宠幸，这是课本中的常用实词，如《阿房宫》中的“缦立远视，而望幸焉”。

(2)命题透析：此题主要考查文言文本的内容理解和语言表达能力、答案是：又认为傅珪刚正忠实，敢于直言，应当起用，吏部按照卢雍的话上奏，没有回复。

高一必修2生物《步步高》习题与答案

第六章从杂交育种到基因工程训练24 杂交育种与诱变育种基础过关知识点一杂交育种1．用纯种的高秆(D)抗锈病(T)小麦与矮秆(d)易染锈病(t)小麦培育矮秆抗锈病小麦新品种的方法如下：高秆抗锈病小麦×矮秆易染锈病小麦――→①F 1――→②雄配子――→③幼苗――→④选出符合要求的品种。

下列有关此种育种方法的叙述中，正确的是 ( ) A ．过程①是杂交B ．过程④必须使用生长素处理C ．过程②是自交D ．过程③必须经过受精作用2．用杂合种子尽快获得纯合子的方法是 ( ) A ．种植→F 2→ 选不分离者→纯合子 B ．种植→秋水仙素→纯合子C ．种植→花药离体培养→单倍体幼苗→秋水仙素处理→纯合子D ．种植→秋水仙素→花药离体培养→纯合子3．下图为利用纯合高秆(D)抗病(E)小麦和纯合矮秆(d)染病(e)小麦快速培育纯合优良小麦品种矮秆抗病小麦 (ddEE)的示意图，有关此图叙述不正确的是 ( )A ．图中进行①过程的主要目的是让控制不同优良性状的基因组合到一起B ．②过程中发生了非同源染色体的自由组合C ．实施③过程依据的主要生物学原理是细胞增殖D ．④过程的实施中通常利用一定浓度的秋水仙素4．用杂合子(DeEe)种子获得纯合子(ddee)，最简捷的方法是 ( ) A ．种植→F 1→选双隐性者→纯合子 B ．种植→秋水仙素处理→纯合子C ．种植→花药离体培养→单倍体幼苗→秋水仙素处理→纯合子D ．种植→秋水仙素处理→花药离体培养→纯合子知识点二诱变育种5．下列几种育种方法，能改变原有基因的分子结构的是() A．杂交育种B．诱变育种C．单倍体育种D．多倍体育种6．不属于诱变育种特点的是() A．具有不定向性B．频率较高C．多数有害D．多数有利7．诱变育种一般不使用以下哪项作为诱变因素()A．X射线B．硫酸二乙酯C．亚硝酸D．抗生素8．下列不属于诱变育种实例的是() A．一定剂量的γ射线引起变异获得新品种B．X射线处理得到高产青霉素菌株C．激光照射获得动植物新类型D．人工种植的马铃薯块茎逐年变小能力提升9．可获得无子西瓜、青霉素高产菌株、矮秆抗病小麦和无子番茄的方法分别是()①诱变育种②杂交育种③单倍体育种④多倍体育种⑤生长素处理A．⑤①②④B．④①②⑤C．②①③⑤D．④①③②10．育种工作者从纯“南特号”品种的稻田中偶然发现一株矮稻，并由此培育出“矮秆南特号”新品种。

精选高中古诗词阅读鉴赏步步高(全)答案解析共50题

精选高中古诗词阅读鉴赏步步高(全)答案解析共50题1．阅读下面这首唐诗，完成下面小题。

田家行王建男声欣欣女颜悦，人家不怨言语别。

五月虽热麦风清，檐头索索缲车鸣。

野蚕作茧人不取，叶间扑扑秋蛾生。

麦收上场绢在轴，的知①输得官家足。

不望入口复上身，且免向城卖黄犊。

田家衣食无厚薄，不见县门身即乐。

（注）①的知：确切知道。

1．下列对这首诗的理解和赏析，不恰当的一项是（）A．首句运用互文的手法，写出了村子里的男男女女喜乐自得的样子。

他们因为丰收，平日的愁怨一洗而空，连话语的音调也与平常不同。

B．三、四两句描绘了一幅“檐下缫丝图”，叠词“索索”写出了一派忙碌的场景。

织妇因喜悦，虽面对五月艳阳，仍觉麦香中的热风清凉宜人。

C．七、八两句写村民们拿辛勤劳动所得的粮食、绢匹交租，因丰收而足够应付官家，村民们的这种喜悦心情契合全诗的感情基调。

D．此诗直陈其事，全诗语言朴素自然，不事雕饰，立意精巧，凝炼精警，于平易中见深刻，是乐府诗中的佳作。

2．简析本诗最后四句的内容及其传达出的思想感情？【答案】1．C2．①最后四句写村民们不奢望吃饱穿暖，只求保住耕牛，不被抓进衙门就高兴了。

②寄寓了作者对淳朴善良的村民们悲苦命运的深切同情，③深刻揭露了统治阶级对百姓的无情剥削。

【分析】1．本题考查学生对诗歌的形象、语言、表达技巧和思想感情的把握能力。

C.“契合全诗的感情基调”是错误的。

七、八句描写丰收的场面，和诗歌“悲苦”的情感不一致。

故选C。

2．本题考查学生评价诗歌思想内容和情感的能力。

诗歌最后四句的意思是：在这丰收的年景里，他们并不指望打下的粮食自己吃，织好的绢自己穿，只指望能免除到城里卖黄犊，以缴纳官府的横敛就行了。

乡民们说自家并不计较是否吃得好穿得好，认为只要不进县衙门吃官司那就是最大的幸福了。

通过“卖黄犊”“身即乐”可知，淳朴善良的村民们的命运非常的悲惨，从而表达了作者对淳朴善良的村民们悲苦命运的深切同情。

同时通过“输得官家足”可知，百姓们虽然获得丰收，但是要应付官家，所以也深刻揭露了统治阶级对百姓的无情剥削。

2025高考英语步步高大一轮复习讲义人教版必修第二册——选择性必修第四册进阶写作答案精析

2025高考英语步步高大一轮复习讲义人教版必修第二册——选择性必修第四册进阶写作答案精析进阶写作答案第一章应用文写作一、实战演练Dear Glen，I am Li Hua, monitor of Class 1, Senior 3. I am writing to invite you to join us to climb a mountain next Friday，which is the Double Ninth Festival.Mountain climbing serves as a traditional activity on that day.Standing on the top of the mountain，we can enjoy broader horizons.We will gather at the school gate at 4：00 p．m.on that day.The school bus will take us to the Qingyun Mountain.Bottled water and snacks will be offered.And there are stone steps up to the mountaintop，so it won’t be so challenging and tiring.We would appreciate it if you could join us.Yours sincerely，Li Hua 二、实战演练Dear Sir or Madam，I have read your advertisement for a junior reporter at the “Campus V oice” section in the English school newspaper and I show great interest in it.I feel quite qualified for the position so I am writing to apply for it.I have been learning English for more than 10 years with a good command of oral and written English，which enables me to communicate with others fluently.Moreover，not only am I good at researching and presenting information in a compelling and informative way but I am also experienced in interviewing and st but not least，I’m outgoing as well as warmhearted，which makes me get along well with others.If given the chance，I plan to fully utilize my skills and work diligently to contribute to the “Campus V oice” section.I am looking forward to your reply.Yours sincerely，Li Hua 三、实战演练Dear Mr Smith，I’m glad to provide you with some suggestions on your upcoming trip to Beijing during the MidAutumn Festival.Beijing，as the capital of China，offers a rich cultural experience.The Palace Museum showcases Chinese history.The Tian’anmen Square is a symbol of China.The Great Wall offers breathtaking views.You can also explore hutongs(traditional alleyways) to experience traditional Chinese culture.As for fine food，you can try Beijing Roast Duck，Zhajiangmian and Bingtanghulu.By the way，use the subways，buses or taxis to get around.Renting a bike or using shared bicycles is also convenient.I hope these suggestions will be helpful.Enjoy your trip to Beijing during the MidAutumn Festival!Yours sincerely，Li Hua 四、实战演练Dear Anne，I’m writing to convey my sincere appreciation for your kind help and care during my stay in London，without which I wouldn’t have enjoyed it so much.During the week，the comfortable room，delicious meals and especially your friendly family members all made me feel at home，leaving me lasting memories.Moreover，guided by you，I was honored to have a chance to visit those tourist attractions in London and be exposed to such an amazing culture as well as beautiful scenery.It was your generous help that enabled me to have a better understanding of your country and culture.Thanks again for your kind help and I will be more than pleased if I have the opportunity to repay your kindness by showing you around Beijing.Yours，Li Hua 五、实战演练Dear Wilson，How’s everything with you? I’m excessively sorry to tell you that I can’t attend your lecture concerning Internet Plus.I’m writing you this letter of apology to show my deep regret.The reason for my being absent is that my mother is seriously ill，so I will take her to hospital tomorrow since my father is on a business trip for an urgent matter.I will care for my mother.To be frank，I am extremely interested in the topic of Internet Plus.Therefore，it is really a pity that I will miss it.I wonder if there are any relevant materials of the lecture.If so，I can learn it by myself when it’s convenient.I want to extend my apology to you once again.I hope it won’t cause you much trouble.I sincerely hope you can understand my situation/think in my position and accept my apology.Yours，Li Hua 六、实战演练Dear Mr Green，How is everything going? I am writing in sincerity to ask you a favor regarding a play we adapted for the upcoming English Evening.The play is based on the story of Hua Mulan who，after disguising herself as a man，joined the army instead of her father in the Northern Wei Dynasty.To us，however，the adaption of such an epic is quite challenging and we don’t want anything inappropriate to spoil the play.So would you please spare some time to revise the draft script attached to this email? If possible，may I pay you a visit at your office next Tuesday to give you more details?Any of your professional advice would be highly appreciated.Best wishes.Yours truly，Li Hua 七、实战演练Dear Michael，Learning that a study trip will be held，I’d like to recommend a wonderful destination：Nanjing.Here are the reasons.As an ancient capital of six dynasties and a modern city with highquality development，Nanjing has much to provide for a study trip.For example，the grand museums and solemn monuments will undoubtedly educate us students not to forget history and motivate us to cherish the present.Meanwhile，efficient and convenient transportation adds attraction and vitality to this charming city.A study trip to Nanjing promises to be fruitful!Yours，Li Hua 八、实战演练Dear Li Jin，I’m going to study Chinese in Tianjin this summer vacation.I’m writing to see if it is possible for you to provide me with information regarding relevant courses in your school.First of all，I want to know how many students there will be in each class and if the courses focus on listening and speaking practice.Besides，I wonder whether I’ll have the opportunity to communicate with Chinese students，which will surely be a good chance for me to learn more aboutChina.At last，I would be grateful if you could tell me whether accommodations are included.I’m looking forward to your early response.Yours faithfully，Chris 九、实战演练Dear Terry，I’m glad to know you desire to be a volunteer of the Sunshine V olunteer Club.As a member，I do think it is worthwhile to be engaged in voluntary work.I’m writing to share with you the details concerning it.A wide variety of regular activities are scheduled on a weekly basis，such as visiting the nursing home and organizing events to raise people’s awareness of environmental st weekend we collected books for the children in remote areas who have little access to them.We make great efforts to spread warmth and care，and it does pay off.Once you decide，please fill in the attached application form and send it to me.Eagerly looking forward to your participation.Yours，Li Hua 十、实战演练Dear Australian friends，On behalf of our school，I feel greatly privileged to convey warm welcome to you.We are delighted to have you with us.To make your stay here memorable，various activities will be arranged to enhance our mutual understanding and experience different culture.As planned，we will hold a talent show where everyone can show their outstanding performances.Classes on traditional Chinese culture are also scheduled，such as papercutting，Chinese opera，calligraphy，etc.，followed by a giftexchanging activity.Additionally，you’re invited to pay a visit to surrounding tourist attractions.I sincerely hope that you can enjoy yourselves and wish you a pleasant journey.Thank you!Yours，Li Hua 十一、实战演练NOTICETo promote our traditional Chinese culture，“Tang Suit Design Contest” will be held in the school hall next Friday.Every participant is allowed to hand in only one entry，which must be designed on your own.Besides，each piece is required to be displayed with a brief introduction of your designphilosophy.All entries will be submitted to the Students’ Council before next Tuesday.Those that stand out as the top ten will be awarded.Pictures of the winners’works will be posted on our school website.Every student studying in the International Department is welcome to take part in the competition.The Students’ Council十二、实战演练World Environment Day on CampusJune 5th,2023 marked the 50th anniversary of World Environment Day，with the slogan “Beat Plastic Pollution”．In honor of this occasion，our school organized various activities to sensitize students about the urgent need to combat plastic pollution and promote sustainable practices.The event started with an engaging presentation by environmental experts，who highlighted the detrimental impact of plastic and emphasized the importance of reducing，reusing，and recycling plastic.Then a plastic collection drive was held so as to encourage everyone to bring in their plastic waste for proper disposal.Additionally，students participated in a postermaking competition，creating thoughtprovoking artworks that showcased the importance of sustainable alternatives.The response to these activities was overwhelming.It is through such collective efforts that we can hope to “Beat Plastic Pollution”and create a cleaner，healthier environment for future generations.English Club 十三、实战演练Last week，I participated in our school sports meeting，competing in the 400meter race—a thrilling and unforgettable experience.On hearing the sharp whistle，I dashed out，the wind rushing against my face and the crowd’s cheers echoing around me.My attempts to match the pace of fellow runners proved challenging，but I did not give up.I pushed myself to the limit and crossed the finishing line with all my strength.I was glad that I took part in the sports meeting，which not only pushed my limits but also made me realize the importance of persistence.十四、实战演练Dear schoolmates，V olunteering is playing a crucial role in students’ overall development.With the approach of winter vacation, it’s high time that we took up volunteering.A willing heart to volunteer provides us with massive benefits.V olunteering not only makes us feel connected with the community but also is beneficial to our wellbeing.Blessed with a sense ofpurpose in life，we are offered an amazing opportunity to learn valuable skills.There are different ways of serving people，ranging from volunteering at children’s home or libraries to virtual volunteering，such as helping pupils with schoolwork online.Why not throw ourselves into volunteering? It makes us a better person and creates a better world.Yours sincerely，Li Hua 十五、实战演练The Person I Admire MostWhen it comes to the person I admire most，I can’t help thinking of Fan Jinshi who is an archaeologist and a guard of Dunhuang.After graduating from Peking University，Fan Jinshi chose to work in Mogao Caves，Dunhuang.Although the living environment was terrible，she was deeply attracted by the works of art and desired to protect them for the future generations.She and her team overcame difficulties，explored scientific concepts and built a “digital Dunhuang”，which has balanced the relationship between cultural relics protection and tourism.Fan Jinshi is called the daughter of Dunhuang.She deserves the respect of all at home and abroad.第二章读后续写第2节技法指导技法三A few weeks later，when I almost forgot the contest，there came the news.To everyone’s surprise，I，an immigrant，won first place in the writing contest.Hearing the good news，I felt a sense of joy surging through me.I leapt into the air and shouted out loud，“I made it！”During the award presentation ceremony，I was invited to deliver a speech.Patiently and confidently，I told the audience how I once didn’t love writing and now enjoyed writing and how I realized the value of perseverance with the help of my teacher.I went to my teacher’s office after the award presentation.With the trophy in hand，I entered the office.My teacher rose from the seat and came up to me.“Congratulations！” he said，slapping me on the back.He grinned from ear to ear as I showed him the trophy.“I owe my success to you，” I said sincerely.“Without your encouragement and belief，I wouldn’t have succeeded.”He laughed，his eyes shining with excitement.“I knew you had it in you.I’m proud of you for notgiving up.” Whenever looking back on this incident，I feel extremely grateful to him.It was my social studies teacher who encouraged me to realize my potential and thus changed the course of my life.技法四实战演练Ⅰ.1.Relieved，Jenny told the truth to everyone.2．Feeling scared and helpless，Jane sat beside a tree and held her shoulders in her arms to make herself warm.3．They hugged and kissed with tears rolling/pouring/streaming down their cheeks. 4．“I...I don’t know，” he stammered, his voice trembling with fear.5．If she had not quarreled with Tom, they would have enjoyed a great time near the lake. 6．Mother hugged the twins tightly，whose faces were glowing with excitement.7．Since he continued speaking about wanting to share his paintings with the world, I knew what had to be done.8．I thanked him，saying that not only did he mend my shirt with his craftsmanship but he also repaired my dream with sportsmanship.9．It was at that moment that I was overwhelmed with gratitude to my teacher.10．A cold feeling crept over his heart and made him shiver.11．Drowned in happiness，Jimmy dashed out of the school gate like a free bird.12．Seeing such extraordinary beauty, I think every cell in my body woke up.Ⅱ.But Molly insisted that they should wait and keep the book.She didn’t place the illustrated book on the bookshelf，hoping Rick would show up soon.A kid might make all kinds of promises and fail to keep them.But Rick was so sincere and eager that Molly believed he wouldn’t break his promise.A kid’s promise is more valuable than the cost of the book.The book would rest in the drawer still until Rick showed up.Then on one sunny morning，Molly found a little boy running all the way towards her bookstore holding something.The little boy was exactly Rick.Rick pushed the door open and rushed to the counter holding his money box.Molly excitedly pulled the drawer open，took out the illustrated book and walked out from the counter immediately.She knelt with one leg and smiled at Rick，handing the book to Rick.Rick’s eyes were shining looking at the book，and he put the box on the floor and held the book.“I think you guys had better make your deal here at the coffee table，”said Rex.Molly winked at him delightedly.The sunlight came through the glass window and cast on the little customer and the nice lady.第3节语料素材一、实战演练1．Her face lit up with happiness as she received the presents prepared by the children.2．They jumped to their feet at the news, with their eyes filled with joy.Hearing the news, they jumped to their feet with joy in their eyes.3．Overwhelmed with gratitude, I couldn’t say a word.4．I was so deeply moved that tears welled up in my eyes.5．Hearing the news that his father passed away, his eyes welled up with tears.6．She got lost and it began to rain, a deep sense of despair overwhelming her.7．Her face turning pale, she stood there, tonguetied.8．My heart was in my mouth when I walked into her office.9．At the thought of the frightening bear, a sense of fear welled up in him.10．He was half dead with fear when he found he was surrounded by wolves.实战演练1．Having known others’ attitude, he shook/trembled with anger, holding his clothes firmly. 2．Filled with anger, Mike was unable to speak a word.3．I was about to explode and waved my fist at him.4．I was ashamed of my bad performance in the contest.5．I stared at him in shock, with a small sound of disappointment escaping my throat.6．What surprised me was that there was a path here.7．A look of surprise crossed her face but she soon calmed down.8．Uncontrollably, a wave of regret washed over me as I heard the bad news.9．If only I had not left the farm alone!10．If I had followed his advice, we would be having fun together.二、实战演练Ⅰ.1.She jumped up，dashed forward and hugged the boy tightly.2．Standing beside the empty road，they looked up into the sky, feeling the precious peace. 3．As night was beginning to fall, Jane sat on the grass, staring at the vast sky, frightened and hungry.4．With a bunch of flowers in her hands，Mindy stood beside the sea and looked down at the flowers with a smile，wondering what to do tomorrow.5．She crept along the path，bent over swiftly and cupped her hands around the butterfly gently. 6．With her heart beating wildly，the innocent girl，held by her mom and screaming withexcitement，unwrapped her delicate gift box which she had been looking forward to without any hesitation.7．Every one of us on the bus looked on and laughed crazily.Ryan struggled to his feet，dusted the jacket and made his way to an empty seat.8．Looking straight into my eyes，Mike stroked my hair, whispering，“You are the most beautiful girl I’ve ever met.”Ⅱ.1.the twins got up early, tiptoed to the kitchen and scooped some flour out of the bag their father slid into the kitchen，patting the twins’ shoulders and comforting them in a soft voice they carried the breakfast，advanced upstairs and woke up their mother2．I signaled to him with a thumbsup, feeling proud of him He smiled, took a deep breath and got ready for the race，eyes brimming with determination every runner shot like an arrow三、实战演练1．The gentle breeze stroked his head，as if comforting all his tiredness.2．I closed my eyes and daydreamed in the speeding car.Winding rivers, lofty mountains, deep alleys and sunny beaches held me entirely in their fascination.3．The sun looked at her with a glowing smile and the flowers nodded merrily towards her. 4．The wind was howling dreadfully and the rain was pouring from the heaven，whipping against the branches of lined trees.5．On the day back to school，dark clouds hung low in the sky.The rain poured down，with cold drops and angry winds slapping my face.I was drowned in floods of warm tears and freezing rain.四、实战演练1．Festivals let us enjoy life，be proud of our customs and forget our work for a little while. 2．The precious tricycle not only helped me through that tough period，but also carried Father’s love forward into the far，far future.3．Seeing the paper bag，I felt as if it had been reminding me that I should pass on the kindness that the Mexican family offered me every time I meet someone in need.4．No matter how ordinary a job is，it plays a part in society and therefore deserves our respect. 5．Cold as the rain was，great warmth filled his heart like never before.6．It dawned on me that we should always be an honest person whatever situations we are in.7．I am firmly convinced that the slight power of every person can make our country more prosperous.8．All the students came to realize that everyone wants and deserves to be treated with respect，dignity and warmth.9．It is not how much we do but how much love we put into what we do that benefits our work most.10．The gift you give is not something your loved one keeps，but a voluntary contribution towards the people who really need it in their lives.第4节分类集训一、When my Monday came，I again took the bus to KMTV alone and waited.Everything was familiar this time.But hearing the musical sounds and applause from time to time，I felt my heart was pounding with excitement and nervousness.Eventually，it was my turn.Taking a deep breath，I calmed down.Confident，I went to the piano and began to play.Easy，so easy! Fun almost...right up to the coda at the end.I suddenly realized I should not be at the end! My heart jumped to my mouth.I had skipped a part.A huge part.How did that happen?Somehow my brain went to work and I continued playing.I tried to smile at the camera and played the rest smoothly as if no skipping had happened.After what seemed an eternity，I stopped playing.However，it turned out that my performance had probably lasted barely a minute.Surely the result was as expected—I wasn’t the winner.On my way home，I surprised myself by feeling more relieved than disappointed.I could not pretend that my performance was best.In truth，the other three were far superior.When I came back home to talk about “The Big Skip”，Daddy smiled，“It may not have been noticed by someone who doesn’t know Schubert’s ‘Ave Maria’．Your movement was smooth.You didn’t fall apart.All in all，a worthwhile experience.”二、No sooner had I picked up my phone than Lisa called me.“Belle，how is it going? Do you still need my help？” Lisa asked.“Thanks，Lisa.Everything is OK.And I’d like to tell you about it，” I said.I told her exactly what had happened，and specifically described how I had solved the problem.Lisa praised me for my quick wit.Then I asked her to teach me German in case I needed it later.She promised.By the end of the holiday，I could have already communicated with her in some simple German words.So I was ready for the new term with confidence.When the German teacher entered the classroom in the new term，I felt I’d seen her somewhere before.What amazed me was that she came over to me，saying，“Glad to see you again！I’m Florence.” I was surprised to find that she was the daughter of the lady that I had helped during the holiday.What a fantastic fate! As our new foreign teacher，Florence was patient and considerate.We all respected her and took every lesson seriously.I even made friends with her mother，so I had more opportunities to practise speaking German.I was resolved to visit Germany the next summer holiday.三、Giving or keeping? I struggled with myself.Giving it? Hardly could I imagine life without the model car! After all，it was my most precious treasure，which I had been proud of.My heart kept aching at the prospect of giving it away.Nope! I shook my head determinedly.Glancing at mymother’s expectant eyes，I couldn’t help sobbing.Keeping it? Definitely，it would otherwise upset Alex.Torn between the two tough choices，I was totally at a loss.Nevertheless，deep down，I could feel my affection for Alex.Yep! I resolved to do the right thing.In the moment of parting，my model car went with Alex.Though I was crushed to see it go，my heart sang when I saw his beaming face as he tightly clutched it.Seeing the thumbsup from my mother and sister，I did swell with relief，pride and joy，for I knew it was not a gift；to some extent，it was our concern and love for him.Plus，sharing the model car also strengthened our bond，which，I was fully convinced，would always uplift him.An effort made for the happiness of others lifted us above ourselves as well.四、Then came the final testing day.The whole class gathered in the science classroom，watching breathlessly as Jeff carefully loaded their selfmade robotic hand onto Sergio’s right arm.It fitted quite well! So excited was Sergio that his arm trembled slightly.Having put a baseball on the desk，Jeff signed to Sergio to pick it up.Slowly，Sergio extended his right hand and reached for the ball.Successfully he caught hold of it and everyone present broke into cheers! Holding the ball，Sergio couldn’t contain his tears.Never in his life did he expect to catch something with his right hand!The lifechanging gift for Sergio drew huge attention.Jeff and his students became an instant hit and various media competed to cover the news.When interviewed about the intention of the project，Jeff said，“I intended Sergio’s robotic hand to show our support for him.Meanwhile，I hope to foster students’ scientific spirit through this handson operation.” His students stated that Jeff challenged them to transform abstract concepts into reality，from which they benefited greatly.Soon voluntary donations poured in，which would go to the school’s scientific research and help students develop better.五、Ruby walked over to my mother，we girls holding our breath.We waited to see who would shout first and what terrible things would be said.“We are sorry about the flowers.The girls will fix them and help weed the roses，” said Mom.My sisters and I looked at each other in horror，but Ruby smiled through her tears.“I know we’re particular about these roses，but they’re very special because they remind me of my mother.”Soon both women were down on their knees examining the damaged bushes together.A few weeks later，the plants all came back to life.My mother and Ruby worked together on the roses all summer and many summers to follow.So did my sisters and I．A friendship was formed between the families.Ruby became part of our family，spending many happy hours at our house，especially during countless birthdays，graduations and weddings.And the rose fence wasn’t a fence any longer.My mother had turned it into a bridge.六、Suddenly，I remembered the door to the basement.I dashed to the door and opened it withoutany hesitation.There she sat on the top step，quiet as a mouse，head down，ears hanging down.She had been following me，as she always did，and I had casually closed the door on her.So she had to wait quietly for me to find her.I don’t know whether she assumed that she was being punished，but it was clear that she was hurt，for she behaved differently this time.I held her in my arms tightly，telling her how sorry I was.I touched her head and rubbed her belly gently，telling her that she was not making trouble.She let me hold her for exactly one minute and then suddenly ran off，returning with a toy for me to throw.At that very moment，Dottie taught me a valuable lesson：Forgive quickly because forgiveness is to light a lamp not just for others but also for ourselves.Life is short.There is so much love to offer and receive and so many toys to chase.。

化学选修一答案解析步步高

化学选修一答案解析步步高1．下列说法正确的是A．金属腐蚀就是金属原子失去电子被还原的过程B．合金都比纯金属易被腐蚀C．将金属与外加直流电源的正极相连，而将负极接到废铁上，可以防止金属被腐蚀D．镀锌铁比镀锡铁更不容易被腐蚀答案：D【详解】A．金属腐蚀就是金属原子失去电子被氧化的过程，故A错误；B．选项：合金不一定比纯金属易被腐蚀，如不锈钢改变了金属的内部结构，比纯铁耐腐蚀，故B错误；C．选项：将金属与外加直流电源的负极相连，则该金属作阴极，而将正极接到废铁上，废铁作阳极，作阴极的金属被保护，可以防止金属被腐蚀。

金属直接与电源正极相连，该金属做阳极，直接发生氧化反应被腐蚀，故C错误；D．金属活泼性 Zn>Fe>Sn，原电池中活泼金属易被腐蚀，则镀锌铁片比镀锡铁片更不容易被腐蚀，故D错误；故选D 。

2．如图所示，甲池的总反应式为2CH3OH+3O2+4KOH= =2K2CO3+6H2O。

下列说法正确的是A．甲池是电能转化为化学能的装置，乙、丙池是化学能转化电能的装置B．甲池通入CH3OH的电极反应为CH3OH- 6e-+ 2H2O=+ 8H+ C．甲池中消耗560 mL(标准状况下) O2，此时乙池中银极增重3.2g D．反应一段时间后，向丙池中加入一定量盐酸，一定能使MgCl2溶液恢复到原浓度答案：C解析：甲池中能发生自发的氧化还原反应，属于原电池，通入甲醇的一极为负极，通入氧气的一极为正极，则石墨为阳极，Ag为阴极，左侧的Pt为阳极，右侧的Pt为阴极。

【详解】A．甲池中能发生自发的氧化还原反应，属于原电池，乙池和丙池属于电解池，故A错误；B．在燃料电池中，负极是甲醇发生失电子的氧化反应，在碱性电解质下的电极反应为CH3OH-6e-+2H2O+8OH-=+8H2O，故B错误；C．甲池中消耗560mL(标准状况下)O2，氧气的物质的量为0.025mol，则转移电子0.1mol，根据转移电子守恒知，乙池中Ag电极生成0.05molCu，则Cu的质量=0.05mol×64g/mol=3.2g，故C正确；D．电解池丙池中，电解后生成氢氧化镁、氢气和氯气，要想复原，要加入HCl，加盐酸会增大水的量，故D错误。

文言文步步高答案解析

上一篇下一篇共25篇高中文言文阅读训练步步高答案一2012年09月26日 21:47:421．曲突徙薪1.(1)傍：同“旁”，旁边 (2)不：同“否”，否则 (3)息：同“熄”，熄灭 (4)坐：同“座”，座位 (5)乡，同“向”，先前 (6)亡：同“无”，没有 (7)寤：同“悟”，醒悟，觉悟2．(1)拜访 (2)烟囱 (3)改变 (4)理睬 (5)邀请 (6)假如3．B(都是承接关系。

A修饰关系；C转折关系；D并列关系) 4．(1)不然将会有火灾隐患。

(2)被火烧伤的人安排在上席，其余的人按照功劳依次入座。

(次：作动词，依次排定： 5．本篇寓言告诫人们：防患于未然比灾难发生以后的补救更为重要，即防灾重于救灾。

本文也讽刺了那种重视救灾而轻视预防的愚蠢行为。

2．苏代为燕说齐1.(1)还，同“环”，环绕 (2)贾，同“价”，报酬 (3)说，同“悦”，喜欢2．B（都是回头看的意思）3．(1)我有一匹骏马，想要卖掉它，可是接连三天在市场里，也没有哪个人来问一下。

(2)现在我想把“骏马”送给齐王看，可是没有人替我前后周旋。

4．有才能的人要善于推销自己，要像卖马人借助伯乐提高马的身价一样，要采取一些策略引起他人或社会对你的重视。

3．梁王魏婴觞诸侯1．(1)敖，同“熬”，煎熬。

[燔炙：烧烤](2)尊，同“樽”，酒杯。

(3)与，同“欤”，句末语气词。

(4)属，同“嘱”，告诫。

2．(1)进酒，劝饮；(2)起来；(3)进献；(4)断绝，戒除；(5)甜，甘美；(6)睡醒3．B[介词，因，因为。

A项连词，表承接；C项介词，凭；D项介词，用)4．A[A项是意动用法，以之为甘，译为“觉得酒味很甜美”。

其余项均为使动用法：使……昂，抬高；使……远，疏远；使……亡，丧失]5．(1)楚王登上荆台远望巫山，左边是洞庭，右边是彭蠡，俯视方淮之水，惟觉山水之乐而忘记人之将死，于是在荆台上发誓不再登高游乐。

[强台即荆台，崩山即巫山；左江即洞庭湖，右湖即彭蠡湖。

英语步步高选修一第二单元答案详解

第7行的that =so＂这么；那么＂， the food was not so awful(糟糕的；差劲的)形容词做be动词的表语。 The book is that interesting. The advice is that valuable. 第八行， Basic accommodation was also supplied.基本的食宿也得到提供，是由被动意思的。第10行， I've got a temporary job. “我已经得到一份临时的工作。” job是被句子pay better in town.修饰的，是明显的定语从句特征， job是主语，谓语动词是pay “该句意思是这份工t two and a half years,“在过去的一年半中”这个时间状语是要求用现在完成时have/has done，如其他的so far, recently, up to now,for+ 一段时间等时间状语，讲的是从过去到现在为止已经做了的事情，一般现在完成时的。所以本题应该是has organized. 20.原级much--比较级more--最高级most ，该句意思“最让我印象深刻的是” ,所以用much的最高级。 21. 本题有时间状语for such a long time, be动词真正的主语是后面的we, (We have been in the city) 所以分词是主动动作的，having been “我们已经在这个城市很长时间了”. 25.we 是动词divide的主语，“我们被分成三组”,原句是 After we were divided into ...。本句是省略句，after是介词，接名词或动名词doing。介词考点: 多考接宾语或doing动名词的格式。
3. 本题有关键词眼more....(than),“建筑师比建筑工人的角色更重要 ”。 4. ...they would have gottten... get “得到”, 这个动词要接宾语，缺宾语用what 代替。 5. over time是“随着时间的推移/进展”，但本题没有合适的上下文语境，同学们了解该词组即可。如：They were talking happily over tea/coffee. over表示 “在喝茶 /咖啡期间 ”。 It is getting much colder over time when Winter comes around. 8. ...allow volunteers to be recognized publicly ....“有些物品如T恤衫是让志愿者得到公众承认的（表示被动的动作)，因为他们的奉献行为能够帮助加强他们角色本身。 9. 烟民的数量在一年内下降了17%。本题可以使用一般过去时did或现在完成时have done。注意，该句根本没有被动意思的。 10. reserve=keep“保留；预留” table和reserve的动作关系是被动的， “桌子是预留给顾客的”，reserved是过去分词表被动修饰table. 本句话是“妈妈坐在留给顾客们做的桌子旁。”

步步高大一轮复习讲义数学答案

步步高大一轮复习讲义数学答案【篇一：2017步步高大一轮复习讲义数学4.6】a＋b.【思考辨析】(3)在非直角三角形中有：tana＋tanb＋tanc＝tanatanbtanc．( √ )a.633 3b．－d．－333答案 ba．112答案 d答案 8x1－2sin2 2解析∵f(x)＝2tanx1sinx22cosx24＝2tanx， sinxsinxcosxsin2x题型一三角函数式的化简与求值______________________________________________________ ________.126答案 (1)cos2x 28和、差、倍、互余、互补等)，寻找式子和三角函数公式之间的共同点．1a．－ 81 161b．－ 16185a. 443答案 (1)a (2)d18题型二三角函数的求角问题答案 (1)c (2)b思维升华通过求角的某种三角函数值来求角，在选取函数时，有以下原则：【篇二：步步高大一轮复习讲义数学理科a版【答案解析】2013版】lass=txt>要点梳理1.(1)确定性互异性无序性 (2)属于不属于∈ ? (3)列举法描述法图示法区间法 (5)有限集无限集空集2.(1)a?b b?a ? ? ? 2n 2n－1 2n－23.(1){x|x∈a，且x∈b}{x|x∈u，且x?a} 基础自测 1.{2,4} 2.{x|0x1} 3.(2,3) 4.?10，1，－2??5.b例1 解 (1)当a＋2＝1，即a＝－1时，(a＋1)2＝0，a2＋3a＋3＝1与a＋2相同，∴不符合题意.当(a＋1)2＝1，即a＝0或a＝－2时，①a＝0符合要求. ②a＝－2时，a2＋3a＋3＝1与(a＋1)2相同，不符合题意. 当a2＋3a＋3＝1，即a＝－2或a＝－1.①当a＝－2时，a2＋3a＋3＝(a＋1)2＝1，不符合题意. ②当a＝－1时，a2＋3a＋3＝a＋2＝1，不符合题意. 综上所述，a＝0，∴2013a＝1.(2) ∵当x＝0时，x＝x2－x＝x3－3x＝0，∴它不一定能表示一个有三个元素的集合. ?2要使它表示一个有三个元素的集合，则应有?x≠x－x，?x2－x≠x3－3x，??x≠x3－3x.∴x≠0且x≠2且x≠－1且x≠－2时，{x，x2－x，x3－3x}能表示一个有三个元素的集合. 变式训练 1 0或98例2 解 a中不等式的解集应分三种情况讨论：①若a＝0，则a＝r；②若a0，则a＝x|41??14?a≤x－a?；③若a0，则a＝??x|－ax≤a?.(1)当a＝0时，若a?b，此种情况不存在.41当a0时，若a?b，如图：，则??a－2－1a≤1，a2a0或a－8，∴?a0或2又a0，∴a－8.11当a0时，若a?b，如图：，则?－?a2，∴?2或a0?4a≥2或a0.a2??a≥又∵a0，∴a≥2.综上知，当a?b时，a－8或a≥2. (2)当a＝0时，显然b?a；4?当a0时，若b?a，如图：，则??a－12，∴?0??1a－8≤a?1?2a0.又∵a0，∴12a0.－1当a0时，若b?a，如图：，则??a1240a≤2a2，∴0a≤2.又∵a0，∴0a≤2.综上知，当b?a时，－12a≤2.(3)当且仅当a、b两个集合互相包含时，a＝b，由(1)、(2)知，a＝2.变式训练 2 4 例3 1或2变式训练3 解 (1)∵a＝{x112x≤3}，当a＝－4时，b＝{x|－2x2}，∴a∩b＝{x|2x2}，a∪b＝{x|－2x≤3}.(2)?a＝{x|x1r2或x3}，当(?ra)∩b＝b时，b??ra，即a∩b＝?.①当b＝?，即a≥0时，满足b??ra；②当b≠?，即a0时， b＝{x|－－ax－a}，要使b??11ra，需－a≤2，解得－4≤a0.综上可得，实数a的取值范围是a≥－14例4 a变式训练 4 6 {0,1,2,3} 课时规范训练 a组1.c2.c3.a4.－1或25.{(0,1)，(－1,2)}6.187.解由已知得a＝{x|－1≤x≤3}，b＝{x|m－2≤x≤m＋2}.(1)∵a∩b＝[0,3]，∴m－2＝0，∴m＝?m＋2≥3.2.(2)?rb＝{x|xm－2或xm＋2}，∵a??rb，∴m－23或m＋2－1，即m5或m－3.8.解∵m＝{y|y＝x2，x∈r}＝{y|y≥0}，n＝{y|y＝3sin x，x∈r}＝{y|－3≤y≤3}，∴m－n＝{y|y3}，n－m＝{y|－3≤y0}，∴m*n＝(m－n)∪(n－m)＝{y|y3}∪{y|－3≤y0}＝{y|y3或－3≤y0}. b组1.c2.b3.a4.a5.a≤06.－37.(－∞，－3) x－58.解由≤0，∴－1x≤5，∴a＝{x|－1x≤5}.x＋1要点梳理1.判断真假判断为真判断为假2.(1)若q，则p 若綈p，则綈q 若綈q，则綈p，(2)逆命题否命题逆否命题 (3)①相同②没有3.(1)充分条件必要条件 (2)充要条件(2)易知，綈p：x＋y＝8，綈q：x＝2且y＝6，显然綈q?綈p，但綈p 綈q，即綈q是綈p的充分不必要条件，根据原命题和逆否命题的等价性知，p是q的充分不必要条件.(3)显然x∈a∪b不一定有x∈b，但x∈b一定有x∈a∪b，∴p是q的必要不充分条件.(4)条件p：x＝1且y＝2，条件q：x＝1或y＝2，∴p?q但q p，故p是q的充分不必要条件. 变式训练2 ①④例3 证明充分性：1当a＝0时，方程为2x＋1＝0，其根为x＝－，方程有一个负根，符合题意.21a意.－2且??a0?1a，故方程有两个负根，符合题意.综上知：当a≤1时，方程ax2＋2x＋1＝0至少有一个负根. 必要性：若方程ax2＋2x＋1＝0至少有一个负根. 当a＝0时，方程为2x＋1＝0符合题意.当a≠0时，方程ax2＋2x＋1＝0应有一正一负根或两个负根.则1－2a0或?a，解得a0或0a≤1.1a0综上知：若方程ax2＋2x＋1＝0至少有一负根，则a≤1.故关于x的方程ax2＋2x＋1＝0至少有一个负根的充要条件是a≤1.变式训练3 证明充分性：当q＝－1时，a1＝s1＝p＋q＝p－1.当n≥2时，an＝sn－sn－1＝pn－1(p－1)，当n＝1时也成立，于是an＋1pn?p－1a?p－?p－1?＝p(n∈n*n)即数列{an}为等比数列.必要性：当n＝1时，a1＝s1＝p＋q，当n≥2时，an＝sn－sn－1＝pn－1(p－1).∵p≠0，p≠1，∴an＋1pn?p－1?a＝－?p－1?p.np∵{aaan＋1n}为等比数列，a＝p，又s2＝a1＋a2＝p2＋q，1an∴ap2－p＝p(p－1)，∴p?p－1?2＝p＋q＝p，即p－1＝p＋q.∴q＝－1.综上所述，q＝－1是数列{an}为等比数列的充要条件.课时规范训练 a组1.d2.b3.a4.充分不必要5.①③④6.[3,8)7.解由题意p：－2≤x－3≤2，∴1≤x≤5，∴綈p：x1或x5，q：m －1≤x≤m＋1，∴綈q：xm－1或xm＋1.又∵綈p是綈q的充分而不必要条件，∴m－1≥1，∴2≤m?m＋1≤5.≤4.8.解设a＝{x|p}＝{x|x2－4ax＋3a20，a0}＝{x|3axa，a0}，b＝{x|q}＝{x|x2－x－6≤0或x2＋2x－80}＝{x|x2－x－6≤0}∪{x|x2＋2x－80} ＝{x|－2≤x≤3}∪{x|x－4或x2}＝{x|x－4或x≥－2}.∵綈p是綈q的必要不充分条件，∴綈q?綈p，且綈pd?/綈q，则{x|綈q}?{x|綈p}，而{x|綈q}＝?rb＝{x|－4≤x－2}，{x|綈p}＝?ra ＝{x|x≤3a或x≥a，a0}，∴{x|－4≤x－2}?{x|x≤3a或x≥a，a0}，则???3a≥－2，??a≤－4， a0 或a0.综上，可得－23≤a0或a≤－4.b组1.a2.c3.b4.?3?4，1?∪(1，＋∞) 5.[1,2) 6.①③②④ 7.3或4 ?8.解 (1)当a＝1?x|x－2509＝??x|2x5?x，b＝x|4?2时，a＝??＝??x|1x9?， ?x－22x－1??24?2∴?b＝??19??95?u?x|x≤2x≥4??，∴(?ub)∩a＝??x|4x2??.(2)∵a2＋2a，∴b＝{x|axa2＋2}.①当3a＋12，即a13a＝{x|2x3a＋1}.∵p是q的充分条件，∴a?b.∴a≤213－5??3a＋1≤a2＋2，即3a≤2②当3a＋1＝2，即a＝13a＝?，不符合题意；③当3a＋12，即a13a＝{x|3a＋1x2}，由a?b得a≤3a＋1112，∴?a＋2≥22a3.综上所述，实数a的取值范围是?11?－123∪??3－?3，2.1.3 简单的逻辑联结词、全称量词与存在量词要点梳理1．(1)或且非 (2)真假假真假假真真假真假真真 2．(3)? ?(4)①含有全称量词②含有存在量词基础自测变式训练1 解 (1)p∨q：1是素数或是方程x2＋2x－3＝0的根．真命题．p∧q：1既是素数又是方程x2＋2x－3＝0的根．假命题．【篇三：2017步步高大一轮复习讲义数学2.6】果ax＝n(a0且a≠1)，那么数x叫做以a为底n的对数，记作x＝logan，其中数的底数，n叫做真数． 2．对数的性质与运算法则 (1)对数的运算法则如果a0且a≠1，m0，n0，那么①loga(mn) m②logan③logamnn∈r)；n④logammn＝am(m，n∈r，且m≠0)．m(2)对数的性质①alogan＝n；②logaan＝n(a0且a≠1)．(3)对数的重要公式logan①换底公式：logbn＝ (a，b均大于零且不等于1)；logab②logab＝13．对数函数的图象与性质4.反函数指数函数y＝ax与对数函数y＝logax互为反函数，它们的图象关于直线对称．【思考辨析】31－x11?，函数图象只在(6)对数函数y＝logax(a0且a≠1)的图象过定点(1,0)，且过点(a,1)，a?第一、四象限．( √ )解析易知函数定义域为(－1，1)，f(－x)＝ln(1－x)－ln(1＋x)＝－f(x)，故函数f(x)为奇函数，21＋x又f(x)＝ln＝ln?－1x－1?，由复合函数单调性判断方法知，f(x)在(0,1)上是增函数，故1－x选a.112．已知a＝3，b＝log1，c＝log2( )23312a．abc c．cba 答案 ab．bca d．bac11解析 a＝31,0b＝log1＝log321，c＝log2＝－log230，故abc，故选a.2333．函数f(x)＝lg(|x|－1)的大致图象是()答案 b解析由函数f(x)＝lg(|x|－1)的定义域为(－∞，－1)∪(1，＋∞)，值域为r.又当x1时，函数单调递增，所以只有选项b正确．34．(教材改编)若loga1(a0，且a≠1)，则实数a的取值范围是( ) 430，? a.??4?30，?∪(1，＋∞)c.??4?答案 c3解析当0a1时，logaaa＝1，433∴0aa1时，logalogaa＝1，∴a1.443－b．(1，＋∞) 3?d.??4，1?答案43 3－a解析 2a＋2＝2log43＋2－log43＝2log2log＝3＋4＝3. 3题型一对数式的运算11例1 (1)设2a＝5b＝m，且＋＝2，则m等于( )aba.．10c．20d．100 5＋lg20的值是．答案 (1)a (2)1解析 (1)∵2a＝5b＝m，∴a＝log2m，b＝log5m， 1111∴＋logm2＋logm5＝logm10＝2. ablog2mlog5m∴m＝(2)原式＝lg100＝lg10＝1.思维升华在对数运算中，要熟练掌握对数的定义，灵活使用对数的运算性质、换底公式和对数恒等式对式子进行恒等变形，多个对数式要尽量先化成同底的形式再进行运算．(1).log64(2)已知loga2＝m，loga3＝n，则a2mn＝.＋答案 (1)1 (2)12 解析 (1)原式63＝log641－2log63＋?log63?2＋?1－log63??1＋log63?＝log641－2log63＋?log63?2＋1－?log63?2＝log64＝2?1－log63?log66－log63log2＝＝1.2log62log62log62＋题型二对数函数的图象及应用例2 (1)函数y＝2log4(1－x)的图象大致是( )1(2)当0x4xlogax，则a的取值范围是( )2a.?0，2? 2?b.?2?21c．(1，答案 (1)c (2)bd．(，2)解析 (1)函数y＝2log4(1－x)的定义域为(－∞，1)，排除a、b；又函数y＝2log4(1－x)在定义域内单调递减，排除d.选c.(2)方法一构造函数f(x)＝4x和g(x)＝logax，当a1时不满足条件，当0a1时，画出两个10，?上的图象，函数在??2?1?1?可知f??2g?2?，122即2log，则a，所以a的取值范围为，1?.22?2?1方法二∵0x≤，∴14x≤2，2∴logax4x1，1∴0a1，排除选项c，d；取a211x，则有42＝2，log1＝1， 2221显然4xlogax不成立，排除选项a.思维升华应用对数型函数的图象可求解的问题(1)对一些可通过平移、对称变换作出其图象的对数型函数，在求解其单调性(单调区间)、值域(最值)、零点时，常利用数形结合思想．(2)一些对数型方程、不等式问题常转化为相应的函数图象问题，利用数形结合法求解．(1)已知lga＋lgb＝0，则函数f(x)＝ax与函数g(x)＝－logbx的图象可能是( )。

步步高电子版答案2023政治

步步高电子版答案2023政治1、指导中国人民取得新民主主义革命胜利的科学理论是（? ?）[单选题] *A.三民主义B.邓小平理论C.毛泽东思想(正确答案)D.“三个代表”重要思想2、十一届三中全会是新中国成立以来党的历史上最具有深远意义的伟大转折，这次全会作出实行改革开放的新决策，开始了中国从“以阶级斗争为纲”到（? ?）建设为中心，从僵化半僵化到全面改革，从封闭半封闭到对外开放的历史性转变。

[单选题]*A.经济(正确答案)B.政治C.文化D.生态3、69. 防止两极分化、实现共同富裕、最大限度地满足劳动者不断增长的物质和文化需要，是发展社会主义市场经济的暂时目标。

* [判断题] *对错(正确答案)4、人类生存和发展的必要物质前提是（）。

[单选题] *A.地理环境(正确答案)B.人口因素C.社会物质生活条件D.生产方式5、83. 某企业老板煽动员工围攻、殴打征税人员,这是抗税行为。

* [判断题] *对(正确答案)错6、（? ?）的发表，标志着科学社会主义的诞生[单选题] *A.《资本论》B.《共产党宣言》(正确答案)C.《德意志意识形态》D.《哥达批判纲领》7、16. 不断提高劳动者（）是企业长盛不衰的保证。

* [单选题] *A、报酬B、素质(正确答案)C、水平D、权益8、27. 按照新发展理念，在发展经济中要坚持（）与环境友好的基本原则。

* [单选题]*A、资源节约(正确答案)B、生态文明C、保护自然D、开发资源9、10. 遵守（）是多党合作的根本活动准则。

* [单选题] *A、纪律B、宪法和法律(正确答案)C、道德与法律D、约定10、10．中国对社会主义建设道路进行了艰苦探索一下，对探索表述正确的是（? ）[单选题] *A.学习马克思主义B.学习苏联模式C.马克思列宁主义同中国实际相结合(正确答案)D.另起炉灶，独树一帜11、要获得知识，必须（）。

[单选题] *A.认真学习就行了B.只要参加社会实践就行了C.既要积极实践，又要认真学习(正确答案)D.上网学习12、科学社会主义的思想来源是（? ?）[单选题] *A.古典政治经济学B.西方经济学C.黑格尔哲学D.空想社会主义(正确答案)13、22. 我国社会主义民主政治的优势表现在（）。

步步高语文选修下答案

步步高语文选修下答案1、20. 下列句子中没有语病的一项是（）[单选题] *A．“网红”的产生不是自发的，而是网络媒介环境下，网络红人、网络推手、传统媒体以及受众心理需求等利益共同体的综合作用。

B．通过对古典诗文的朗诵，学生感受到了祖国语言文字的韵律美。

(正确答案)C．升旗时，全体同学的目光和歌声都集中到竖立在主席台前的旗杆上。

D．随着人们生活水平的挺向，使电子产品极其广泛地进入大众的生活。

2、43. 下列句子没有语病的一项是（）[单选题] *A．一家研究机构的调查结果显示，大约50%左右的人患有“手机依赖症”。

B．能否帮助孩子们树立正确的价值观，是他们形成良好人生观的关键。

C．近日，神舟十三号宇航员在中国空间站为广大青少年带来了一堂精彩的太空科普课。

(正确答案)D．通过“文明学校”创建活动，使每个同学的文明意识显著增强。

3、1“唐宋八大家”是韩愈、柳宗元、苏洵、苏轼、苏辙、王安石、欧阳修、曾巩的合称。

[判断题] *对(正确答案)错4、下列选项中加着重号字读音相同的一项是（）[单选题] *A、遗憾浓酣B、色调协调C、娇柔骄傲(正确答案)D、意境景色5、1苏轼与辛弃疾合称为苏辛，同为豪放派代表。

[判断题] *对错(正确答案)6、下列词语中，加着重号字的注音不正确的一项是（）[单选题] *A、偏僻（piān）杜撰（zhuàn）B、稀罕（gàn）溺爱（ruò）(正确答案)C、辜负（gū）风骚（sāo）D、愚蠢（chǔn）纨绔（kù）7、1《雷雨》是一部歌剧，作者是曹禺。

[判断题] *对(正确答案)错8、“盛筵必散”一语出于《红楼梦》中何人之口？( ) [单选题] *A.探春B.秦可卿(正确答案)C.小红D.妙玉9、1学习老舍写的《我的母亲》一文，我们会由衷敬佩母亲坚忍、善良、宽容、勤俭和好客的品性，也会为儿子子欲养而亲不待的痛悔之情感动不已。

[判断题] *对(正确答案)错10、1关汉卿与马致远、郑光祖、白朴并称为元曲四大家。