新高二,新高三
高二升高三暑假总结

高二升高三暑假总结在经历了一年的高二生活之后,暑假即将结束,我不禁感慨万千。
高二是紧张而充实的一年,我们经历了各种各样的挑战和困难,也取得了一些成绩和进步。
在即将迎来高三的新学期之际,我想对自己进行一次暑假总结,以便更好地迎接新的学习生活。
首先,我要总结的是自己在高二阶段的学习情况。
在这一年里,我面对了许多难题和考试,也经历了许多挫折和失败。
但是,我也通过不懈的努力和坚持,逐渐提高了自己的学习能力和成绩。
我发现,在高二阶段,学习的关键是要有计划、有方法,要善于总结和归纳知识,要勇于面对困难和挑战。
只有这样,才能在高三阶段更好地应对各种考试和竞争。
其次,我要总结的是自己在高二阶段的生活状态。
在这一年里,我经历了许多情感波动和成长历程,也结识了许多新朋友和老师。
我发现,一个人的成长不仅仅取决于学习成绩,还要注重自己的情感和心理健康。
在高三阶段,我要更加注重自己的生活状态,要保持积极乐观的心态,要学会处理人际关系,要注重自己的身心健康。
最后,我要总结的是自己在高二阶段的规划和目标。
在这一年里,我逐渐明确了自己的职业规划和学习目标,也制定了一些实现目标的计划和措施。
我发现,一个人只有明确自己的目标和规划,才能更好地前进,才能更有动力和方向。
在高三阶段,我要更加明确自己的规划和目标,要努力实现自己的梦想,不断提高自己的综合素质和竞争力。
总之,高二升高三的暑假总结,不仅是对自己过去一年的成长和收获的总结,也是对自己未来学习和生活的规划和展望。
我相信,只要我坚持努力,不断进取,就一定能在高三阶段取得更好的成绩和更大的进步。
让我们共同期待新学期的到来,迎接新的挑战和机遇!。
高三高考备考学习工作计划(10篇)

高三高考备考学习工作计划(10篇)2023高三高考备考学习工作计划(10篇)好的备考学习计划都具备一些什么特点呢?时间过得太快,让人猝不及防,我们的工作又进入新的阶段,为了今后更好的工作发展,是时候静下心来好好写写计划了。
下面是小编给大家整理的高三高考备考学习工作计划,仅供参考希望能帮助到大家。
高三高考备考学习工作计划篇1不管你爱与不爱,盼与不盼,高三都会如期而至。
大多数准高三将于八月份正式开学,正式与高三第一次亲密接触。
刚升入高三,新高三学生们会面临比以往更繁重的学习任务,学习和生活节奏将变得更快。
如何规划好整个高三的学习,以及及时调整好身心状态,尽快投入到备考中?了解自己的优势劣势做好高三全年学习规划高考就是考验学生在这一年内的努力程度,考验学生在高一高二基础的牢固程度的一种工具。
由于这样那样的一些原因,新高三学生在高一高二的学习过程中,难免会有一些弱势的科目。
对于弱势科目,肯定是要找时间补上去的,而这个过程往往也是很痛苦的,犹如揭开伤疤来疗伤。
除了要补习弱势科目之外,如何让优势科目更上一层楼,也是一个不小的难题,再加上高考一轮复习与新知识的学习、各类大小考试杂糅……此等复杂的备考情况,如果高三学生没有认真规划好高三全年的学习,很容易陷入弱势科目依旧弱,优势科目没长进,疲于应付各类考试的状态。
怎样才能跳出这样的怪圈?一、结合考纲定位弱势科目的弱势所在把时间用在刀刃上高三一年时间宝贵,除了吃饭睡觉、上课及考试时间,真正用于学习的时间是不够充裕的。
怎样才能在短时间内比较大幅度的提高弱势科目的成绩?小编建议高三学生找到自己弱势科目相应的高考考试大纲及考试说明,了解该科目的考点有哪些,自己比较弱势的考点有哪些,然后找相应的学习技巧来提高它们。
二、优势科目再上一层楼高考成绩更有保障对于高一高二学得比较好的科目,在高考备考的时候,高三学生也不能疏忽,不仅要保持优势,还要想办法再提升一下。
对于优势科目的提升,与弱势科目类同,也需要对照着高考考试大纲来确定需要提高的部分,将优势科目中较弱势的知识点提高上来,会提升优势科目的总体实力。
高中生竟然有18种升学规划途径!新高二、高三必看!

01
常规类路径
普通招生必须是参加高考统考,但是在录取时可根据不同招生政策加分投档或者降分录取。
1.裸考,按分录取
也就是我们平常所说的高考,由教育部考试中心命题或相关省市自主命题,是我国普通高校招生的主要选拔方式。
除保送生、体育单招等极为特殊的升学路径外,参加高考是本文所述其他各种升学途径的前提和基础。
各省市高考政策以各地公布的为准。
2.强基计划
强基计划2020年首次招生,36所高校强基计划开放了数学、物理、化学、生物、历史、哲学、汉语言文学(古文字学)相关专业,以及信息与计算科学、基础医学专业、理论与应用力学、工程力学、核工程与核技术工科等专业招生。
参加强基计划的考生需要以高考成绩入围参加校测的资格,以综合成绩(通常高考成绩占85%,校测成绩占15%)由高到低录取。
3.综合评价
综合评价录取目前在部分高校试行,并逐年扩大范围。
是指在录取新生时,高校综合考量考生高考成绩、高校考核成绩、高中学业水平测试成绩、综合素质评价以及高校自身培养特色要求等维度内容,对考生综合评价,择优录取。
综合评价的成绩由三部分构成:高考成绩+校测成绩,另外还有参考考生高中的综合素质评价信息。
(通常高考成绩占85%,面试占15%)
4.保送生。
高二进高三动员大会发言稿学生

高二进高三动员大会发言稿学生
喂,各位同学,今儿个咱来聊聊高二进高三这档子事儿。
咱们四川娃子说哈,高二就像那刚出锅的麻辣火锅,热辣辣地烫人,让人忍不住想多吃几口。
这一年里,咱们一起熬过了无数的日夜,攻克了一道道难题,也享受了胜利的喜悦。
可高三啊,那就是个麻辣加倍的变态辣火锅,得拼尽全力才能啃下来。
贵州的兄弟姐妹们,你们都知道咱们那儿的山路十八弯,走起来那叫一个费劲。
高二就像那弯弯曲曲的山路,虽然坎坷,但咱们都走过来了。
现在眼瞅着就要上高三那座更高的山峰了,咱们得拿出那股子爬山的劲儿,一步一个脚印,稳稳当当地往上走。
陕西的老乡们,咱都知道陕西人实在,说话也直来直去。
高二这一年,咱们都实实在在地学了不少东西,也实实在在地付出了努力。
高三了,咱们得更实在点,把每一分每一秒都用在刀刃上,别让那些虚头巴脑的东西耽误了咱们的前程。
北京的哥们儿姐们儿,咱都知道北京是个快节奏的地方,干啥都得快。
高二咱们已经适应了这种快节奏,高三咱们得更快点,不仅要学得快,还得想得快、反应得快。
这样咱们才能在高考这场大战中脱颖而出,成为那最亮眼的仔!
所以啊,同学们,高二进高三这事儿,咱们得拿出十二分的精神来应对。
不管你是哪儿的人,咱们都得一起努力,一起拼搏。
只有这样,咱们才能在那高考的大舞台上展现出自己的风采,实现自己的梦想。
加油哇,同学们!。
高二生物(新高三)暑期作业高考复习方法策略 第7讲 “连续自交与自由交配”的解题方法(含答案精析)

第7讲“连续自交与自由交配”的解题方法对于特殊遗传现象的推理分析能力的考查是近几年高考试题中的热点,常考的特殊题型有连续自交问题、自由交配问题、特殊分离比问题等,复习时针对这些问题首先要构建出思维模型,然后理解相关的解题规律,最后总结出相关的公式并形成牢固的记忆。
一、连续自交问题的解题方法1.第一步,构建思维模型Aa连续自交,在保证所有基因型的个体繁殖能力相同(产生的子代数量一样多)的情况下,建立下列金字塔模型。
从图可解读以下信息:(1)Aa在中轴线上,AA与aa沿此中轴线两侧对称。
(2)杂合子(Aa)比例随自交代数的增加而递减,每代递减50%,最终接近于零。
(3)纯合子(AA+aa)的比例随自交代数的增加而增大,最终接近于1,且显性纯合子(AA)和隐性纯合子(aa)各占一半。
2.第二步,依据上图推导公式如下杂合子Aa=()n,纯合子AA=aa=[1-()n]/2。
3.第三步,整理出相关的曲线模型1. 具有一对等位基因的杂合子亲本连续自交,某代的纯合子所占比例达95%以上,则该比例最早出现在( )A. 子3代B. 子4代C. 子5代D. 子6代【答案】C【解析】试题分析:根据基因分离定律,杂合子自交n代,后代纯合子和杂合子所占的比例:杂合子的比例为()n,纯合子所占的比例为1﹣()n,其中显性纯合子=隐性纯合子=【1﹣()n】.解:由以上分析可知,一对等位基因杂合子亲本连续自交,后代纯合子所占的比例为1﹣()n,n是自交代数.要某代的纯合子所占比例达95%以上,即1﹣()n≥0.95,解得n最少为5,即该比例最早出现在第5代.故选:C.考点:单因子和双因子杂交实验.总结感悟连续自交类题目是常考题型之一,多在选择题中出现,解答此类题目的关键是记住相关公式,而记忆公式的关键是在金字塔思维模型的基础上进行记忆,特别是要记住Aa在中轴线上呈(1/2)n递减,AA 与aa在Aa两侧对称分布,而这一特点是整个记忆链的核心。
立足高二展望高三800字作文

立足高二展望高三800字作文最新立足高二展望高三800字作文5篇高三写作文一定要找准“题眼”,同学们把它找出来,也就是找到了写作的重点。
下面给大家分享一些关于最新立足高二展望高三800字作文5篇,希望能够对大家有所帮助。
立足高二展望高三800字作文(篇1)老师正在如火如荼地讲着,我却窝在墙角昏昏欲睡。
忽然抬头看见黑板右上角的倒计时70天,我不禁一个激冷,后知后觉地意识到我已经上高三了,我竟然已经上高三了。
告别了稚气和童真,我们走进高三,走向成熟。
记得刚开始倒计时的时候还有300天,现在不知不觉已经过去了200多天,我们甚至都来不及感叹时光的飞逝,时间就这样毫无预警的流失了。
这着实让我感觉到__。
它就这样毫不留情的把我们卷入高考的漩涡,就这样残忍得不给我们任何喘息的机会。
70天的时间到底会发生什么,会改变什么,70天之后我们的人生又会转向哪里?现在,我们都在近乎疯狂的奔跑。
因为我们知道一旦歇脚会付出多么惨痛的代价,我们都知道我们没有退路。
接连不断的考试把我们刚入学时想考大学的梦打得粉碎。
一次一次的失败,积聚成了一点一滴的坚强。
直到我们变成钢筋铁骨,直到我们变得坚不可摧,直到我们能够站在自己的伤口上笑望曾经的哀伤。
如果用炼狱这个词来形容高三的生活,我觉得一点也不过分。
早晨天不亮就起床,晚上直至凌晨才睡觉。
每天的早餐都是在赶往班级的路上就着冷风和雪水吃的,每周的假期就是周天一个下午的时间,除了洗澡和睡觉适当的`放松之外,又得重新投入战斗。
不是我们太过紧张,不是我们不懂娱乐,而是我们不敢拿自己的未来做赌zhu。
我们升上凝聚着太多的爱与希望,所以我们只能拼命的学,拼命的追赶。
不光为自己,更多的是为爱我们的人。
曾在多少个夜晚,看着万家灯火都渐渐暗了下去,而我还没有完成今天的任务,累了困了的时候也曾想过放弃。
但随之又觉得自己可笑。
寒窗苦读十二年,只为明年夏天的那一刻,放弃的话又怎能轻易说出口。
于是只能更加拼命的学习,累了,就想想家中的父母,想想他们对我的期待。
进入新高三,高二语文该如何衔接?
进入新高三,高二语文该如何衔接?楚州中学高二语文备课组长金国春进入新高三意味着什么?是无忧无虑阶段的终结,是徘徊在大学和大学间的艰难抉择,是对12年校园生活的小小总结,也是18岁成人的新开端……在高考体制尚未改变之前,对于高三学生来说,高考就是为了考入自己理想的大学去深造。
考进大学靠什么?主要靠文化考试成绩。
这一年,我们该如何做好计划,养成良好的阅读习惯、敏捷的思维习惯、准确的做题习惯和健康的作息习惯,以在最后的高考中取得较满意的成绩?随着2012年高考的结束,也就意味着高二同学将开始新高三的生活。
与高一、高二不同的是,高三学习任务更重,压力更大。
如何与高二知识进行衔接,也就成了一个难题。
下面就高二、高三语文学习如何衔接,如何做好准备等方面问题进行阐述。
一、提前订计划,防时间不够往届的许多毕业生都说自己仅用两三个月进行总复习,时间明显不够。
新高三的学生要吸取他们的经验,要针对自身情况,提前制订学习计划,确定明确的奋斗目标,从新高三的第一天起,就配合老师的教学进度,详细制订一年的复习计划,并付诸行动。
计划是行动的指南,也是目标实现的基本保证。
为了保证学习目标的实现,就必须制定学习计划。
制定学习计划有利于增强学习的主动性,避免盲目性,从而增强有序性。
只要我们能制定一份详细、周密的学习计划,并且按计划主动学习,形成良好的学习习惯,从而就能提高学习效率。
高三语文学习不但要积累知识、掌握方法,还要训练思维、感悟哲理。
语文学习不能抱一切听从老师安排的想法,也不能恨不得上语文课就听笑话,“高高兴兴听语文”,这样学语文是痴人说梦,实干加巧干才能真正学好语文。
每位同学都要定好语文的学习计划。
主要有以下内容:1.阅读一定量的名著。
2.订阅一些有助于自己语文学习的课外书刊。
3.保存好作业纸、笔记本、错题集,并形成系统。
4.做好读书笔记,把自己平时看到的佳作精彩段积累下来。
5.永远把《新华字典》和《现代汉语词典》放在身边,有条件的还可以把《成语词典》和《古代汉语词典》放在书桌里。
数学-2024届新高三开学摸底2024届高二下学期 数学考试及答案解析
2024届新高三开学摸底考试卷(课标全国专用)03理科数学(考试时间:120分钟试卷满分:150分)注意事项:1.答卷前,考生务必将自己的姓名、准考证号等填写在答题卡和试卷指定位置上。
2.回答选择题时,选出每小题答案后,用铅笔把答题卡上对应题目的答案标号涂黑。
如需改动,用橡皮擦干净后,再选涂其他答案标号。
回答非选择题时,将答案写在答题卡上。
写在本试卷上无效。
3.考试结束后,将本试卷和答题卡一并交回。
第Ⅰ卷一、选择题(共8小题,每小题5分,共40分)1.已知集合{}2|250A x x x =->,{}0,1,2,3,4B =,则()A B =RI ð()A.{}1,2 B.{}0,1,2 C.{}1,2,3 D.{}0,1,2,3【答案】B 【解析】【分析】先解出集合A ,找到A 的补集,再求出和B 的交集.【详解】因为{}()25|250,0,2A x x x ⎛⎫=->=-∞+∞ ⎪⎝⎭ ,所以50,2A ⎡⎤=⎢⎥⎣⎦R ð,又{}0,1,2,3,4B =,所以()A B =RI ð{}0,1,2.故选:B .2.已知复数5i12iz =+,则z =()A.12i +B.12i- C.2i+ D.2i-【答案】D 【解析】【分析】根据向量的除法法则求复数z ,再由共轭复数定义求z .【详解】∵5i(12i)2i (12i)(12i)z -==++-,∴2i z =-.故选:D.3.已知π1sin 63x ⎛⎫+=- ⎪⎝⎭,则2πcos 23x ⎛⎫-= ⎪⎝⎭()A.79-B.29-C.29D.79【答案】A 【解析】【分析】利用诱导公式、余弦的倍角公式可得答案.【详解】因为π1sin 63x ⎛⎫+=- ⎪⎝⎭,所以22π2πππcos 2cos π2cos 212sin 3336⎡⎤⎛⎫⎛⎫⎛⎫⎛⎫-=--+=-+-+ ⎪ ⎪ ⎪ ⎪⎢⎥⎝⎭⎝⎭⎝⎭⎝-⎭⎣=⎦x x x x 2179123⎡⎤⎛⎫=---⎢⎥ ⎪⎢⎥⎣⎦=-⎝⎭.故选:A.4.数学来源于生活,约3000年以前,我国人民就创造出了属于自己的计数方法.十进制的算筹计数法就是中国数学史上一个伟大的创造,算筹实际上是一根根同长短的小木棍.下图是利用算筹表示数1~9的一种方法.例如:3可表示为“≡”,26可表示为“=⊥”,现有5根算筹,据此表示方法,若算筹不能剩余,则用1~9这9个数字表示的所有两位数中,个位数与十位数之和为5的概率是()A.13B.512C.12D.712【答案】A 【解析】【分析】根据题意把5根算筹所能表示的两位数列举出来后,求出数字和为5的两位数个数作答.【详解】1根算筹只能表示1,2根算筹可表示2和6,3根算筹可表示3和7,4根算筹可表示4和8,5根算筹可表示5和9,因此5根算筹表示的两位数有14,18,41,81,23,27,32,72,63,67,36,76,共12个,其中个位数与十位数之和为5的有14,41,23,32,共4个,所以所求概率为41123P ==.故选:A5.若数列{}n a 的前n 项积2115n T n =-,则n a 的最大值与最小值的和为()A.3- B.1- C.2D.3【答案】C 【解析】【分析】由题可得21217n a n +=-,利用数列的增减性可得最值.【详解】∵数列{}n a 的前n 项积2115n T n =-,当1n =时,11315a =,当2n ≥时,()121115n T n -=--,()121215215122172171115n n n n T n a T n n n ---===+---=-,1n =时也适合上式,∴21217n a n +=-,∴当8n ≤时,数列{}n a 单调递减,且n a 1<,当9n ≥时,数列{}n a 单调递减,且n a 1>,故n a 的最大值为93a =,最小值为81a =-,∴n a 的最大值与最小值之和为2.故选:C.6.如图所示,正方形ABCD 的边长为2,点E ,F ,G 分别是边BC ,CD ,AD 的中点,点P 是线段EF 上的动点,则GP AP ⋅的最小值为()A.238B.3C.278D.48【答案】A 【解析】【分析】建立平面直角坐标系,设(),P x y ,FP FE λ=,([]0,1λ∈),即可得到3y x =-、1x λ=+,根据数量积的坐标表示得到GP AP ⋅,再结合二次函数的性质计算可得.【详解】如图建立平面直角坐标系,则()0,0A 、()0,1G 、()2,1E 、()1,2F ,设(),P x y ,FP FE λ=,([]0,1λ∈),则()()1,21,1x y λ--=-,所以12x y λλ-=⎧⎨-=-⎩,所以()12x y -=--,即3y x =-,所以(),1GP x y =- ,(),AP x y =,所以()()()222132256GP AP x y y x x x x x ⋅=+-=+--=-+ 2523248x ⎛⎫=-+ ⎪⎝⎭,又[]11,2x λ=+∈,所以当54x =时GP AP ⋅ 取得最小值为238.故选:A7.椭圆2222:1(0)x y C a b a b+=>>的左右焦点为1F ,2F ,点P 为椭圆上不在坐标轴上的一点,点M ,N 满足1F M MP = ,22ON OP OF =+,若四边形MONP 的周长等于4b ,则椭圆C 的离心率为e =()A.12B.2C.2D.3【答案】C 【解析】【分析】根据1F M MP = ,22ON OP OF =+,可得点M 为线段1PF 的中点,点N 为线段2PF 的中点,再根据四边形MONP 的周长结合椭圆的离心率公式即可得解.【详解】因为1F M MP =,所以点M 为线段1PF 的中点,因为22ON OP OF =+ ,所以2ON OP OF ON -=- ,即2PN NF =,所以点N 为线段2PF 的中点,又因点O 为线段12F F 的中点,所以2//OM PF 且212OM PF =,1//ON PF 且112ON PF =,所以四边形MONP 的周长为12PF PF +,又因点P 为椭圆上不在坐标轴上的一点,所以122PF PF a +=,所以24a b =,即12b a =,故椭圆C 的离心率为c e a ===故选:C.8.已知偶函数()f x 满足()()44f x f x +=-,()01f =-,且当(]0,4x ∈时,()ln xf x x=.若关于x 的不等式()f x a >在[]48,48-上有且只有60个整数解,则实数a 的取值范围是()A.(]1,0- B.ln20,2⎡⎫⎪⎢⎣⎭C.ln21,2⎛⎫- ⎪⎝⎭D.ln2ln3,23⎡⎫⎪⎢⎣⎭【答案】B 【解析】【分析】分析可知,函数()f x 是周期为8的周期函数,由题意可得关于x 的不等式()f x a >在[)0,8上有且只有5个整数解,数形结合可得出实数a 的取值范围.【详解】因为偶函数()f x 满足()()44f x f x +=-,则()()44f x f x +=-,即()()8f x f x +=,所以,函数()f x 是周期为8的周期函数,当(]0,4x ∈时,()21ln xf x x-'=,令()0f x '=,可得e x =.由()0f x ¢>可得0e x <<,由()0f x '<可得e 4x <≤.所以,函数()f x 在()0,e 上单调递增,在(]e,4上单调递减,因为关于x 的不等式()f x a >在[]48,48-上有且只有60个整数解,则关于x 的不等式()f x a >在[)0,8上有且只有5个整数解,如下图所示:因为()()ln 42ln 2ln 242442f f ====,且()()62f f =,又因为()()34f f >,所以,要使得不等式()f x a >在[)0,8上有且只有5个整数解,则这五个整数解分别为3、5、2、4、6,所以,()()21f a f >≥,即ln 202a ≤<,故选:B.【点睛】关键点点睛:本题考查利用不等式的整数解的个数求参数的取值范围,解题的关键在于作出函数的图象,明确整数解是哪些整数,再结合图形求解.二、多选题(共4小题,每小题5分,共20分)9.已知函数()22cos sin f x x x =-,则()A.()cos 2f x x= B.()f x 的最小正周期为πC.()f x 在π0,3⎛⎫⎪⎝⎭上单调递减D.()f x 在ππ,36⎛⎫-⎪⎝⎭上单调递增【答案】ABC 【解析】【分析】首先根据三角函数二倍角化简,然后利用整体代入法研究函数图像即可;【详解】()22cos sin cos 2,f x x x x =-=选项A 正确;所以函数()f x 的最小正周期为2ππ,2T ==选项B 正确;根据余弦函数图像性质,()π2π0,,20,0,π33x x ⎛⎫⎛⎫∈∈⊂ ⎪ ⎪⎝⎭⎝⎭(余弦函数对应的单调递减区间),函数单调递减,选项C 正确;根据余弦函数图像性质,()ππ2ππ,,2,π,03633x x ⎛⎫⎛⎫∈-∈-⊄- ⎪ ⎪⎝⎭⎝⎭(余弦函数对应的单调递增区间),函数不单调,选项D 错误;故选:ABC.10.某市为响应教育部《切实保证中小学每天一小时校园体育活动的规定》号召,提出“保证中小学生每天一小时校园体育活动”的倡议.在某次调研中,甲、乙两个学校学生一周的运动时间统计如下表:学校人数平均运动时间方差甲校2000103乙校300082记这两个学校学生一周运动的总平均时间为x ,方差为2s ,则()A .8.7x = B.8.8x =C.2 3.36s = D.2 3.56s =【答案】BC【解析】【分析】根据平均数和方差的计算公式求解.【详解】依题意,总平均时间为200030001088.82000300020003000x =⨯+⨯=++,方差为()()22220003000233108.8288.8 4.44 2.64 3.36200030002000300055s ⎡⎤⎡⎤=+-++-=⨯+⨯=⎣⎦⎣⎦++.故选:BC11.如图,平行六面体1AC 中,1145A AD A AB ∠=∠=︒,AD AB =,AC 与BD 交于点O ,则下列说法正确的有()A.平面11ACC A ⊥平面11BDD B B.若1A O AO =,则平行六面体的体积11112B BDD V AC S =⋅四边形C.111122AO AB AD AA =++D.若60BAD ∠=︒,则16cos 3A AC ∠=【答案】ABD 【解析】【分析】对于A ,由题意可得四边形ABCD 为菱形,则可得BD AC ⊥,再计算1BD AA ⋅,可得1BD AA ⊥ ,从而得BD ⊥平面11ACC A ,再利用面面垂直的判定定理可得结论;对于B ,连接1AC ,可得11A C AA ⊥,从而可证得1A C ⊥平面11BDD B ,进而可求出体积,对于C ,利用空间向量的加法分析判断,对于C ,设1,AB a AA b ==,则可得AC =AC =,然后利用向量的夹角公式计算判断.【详解】对于A ,因为在平行四边形ABCD 中,AD AB =,所以四边形ABCD 为菱形,所以BD AC ⊥,因为1145A AD A AB ∠=∠=︒,AD AB =,所以1111cos 45,cos 45AD AA AD AA AB AA AB AA ⋅=⋅︒⋅=⋅︒ ,所以11AD AA AB AA ⋅=⋅ ,因为BD AD AB =-,所以()11110BD AA AD AB AA AD AA AB AA ⋅=-⋅=⋅-⋅= ,所以1BD AA ⊥,所以1BD AA ⊥,因为1AA AC A = ,1,AA AC ⊂平面11ACC A ,所以BD ⊥平面11ACC A ,因为BD ⊂平面11BDD B ,所以平面11ACC A ⊥平面11BDD B ,所以A 正确,对于B ,连接1AC ,因为1A O AO =,AO CO =,所以1AO CO AO ==,所以1AA C △为直角三角形,即11A C AA ⊥,因为1AA ∥1BB ,所以11A C BB ⊥,因为由选项A 知BD ⊥平面11ACC A ,1AC ⊂平面11ACC A ,所以1BD A C ⊥,因为1BB BD B ⋂=,1,BB BD ⊂平面11BDD B ,所以1A C ⊥平面11BDD B ,所以平行六面体的体积11111111111131112232322A BDDB ADB A B D BB D D BB D D V V V S AC A C S --==⨯=⨯⋅=⋅三棱柱四边形四边形,所以B 正确,对于C ,因为四边形ABCD 为平行四边形,所以O 为BD 的中点,所以1122AO AB AD =+,所以1111122A O A A AO A A AB AD =+=++ ,所以C 错误,对于D ,设1,AB a AA b ==,因为在菱形ABCD 中,60BAD ∠=︒,所以22cos30AC AO AB ==︒=,所以1111cos 3AA AB AD AA AC A AC AA AC⋅+⋅∠==⋅,所以D 正确,故选:ABD【点睛】关键点点睛:此题考查面面垂直的判断,考查平行六面体体积的求法,考查空间向量的运算,解题的关键是正确利用平行六面体的性质结合题意分析求解,考查空间想能力和计算能力,属于较难题.12.已知函数()()1ln f x x x =-,下列选项正确的是()A.()f x 有最大值B.31e e f f ⎛⎫⎛⎫< ⎪ ⎪⎝⎭⎝⎭C.若e x ≥时,()()e 0f x a x --≤恒成立,则1a ≤D.设12,x x 为两个不相等的正数,且121221ln ln 11x x x x x x -=-,则12112x x +>【答案】ACD【解析】【分析】对于A :求导,利用导数判断原函数的单调性和最值;对于B :利用作差法比较大小;对于C :利用定点分析判断;对于D :利用极值点偏离分析证明.【详解】对于选项A :由题意可得:函数()f x 的定义域为()0,∞+,且()1ln 1ln f x x x =--=-,令()0f x ¢>,解得01x <<;令()0f x '<,解得1x >;则函数()f x 在()0,1上单调递增,在()1,+∞上单调递减,所以()f x 有最大值()11f =,故A 正确对于选项B :因为()32ln 333311121ln ,1ln e e e ee e e ef f -⎛⎫⎛⎫⎛⎫⎛⎫=-==-= ⎪ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭⎝⎭,则()432ln 331243ln 31e ln 0e e e e e e 27f f --⎛⎫⎛⎫-=-==> ⎪ ⎪⎝⎭⎝⎭,所以31e e f f ⎛⎫⎛⎫> ⎪ ⎪⎝⎭⎝⎭,故B 错误;对于选项C :构建()()()e F x f x a x =--,则()ln F x x a '=-+,因为()0e F =,且当e x ≥时,()0F x ≤恒成立,则()e 10F a '=-+≤,解得1a ≤,若1a ≤,则()ln 0F x x a '=-+≤当e x ≥时恒成立,则()F x 在[)e +∞,上单调递减,则()()e 0F x F ≤=,符合题意综上所述:1a ≤符合题意,故C 正确;对于选项D :因为121221ln ln 11x x x x x x -=-,整理得112211111ln 1ln x x x x ⎛⎫⎛⎫-=- ⎪ ⎝⎭⎝⎭,即1211f f x x ⎛⎫⎛⎫= ⎪ ⎪⎝⎭⎝⎭,由选项A 可知:函数()f x 在()0,1上单调递增,在()1,+∞上单调递减,当x 趋近于0时,()f x 趋近于0,且令()0f x >,解得0e x <<,不妨设121101e x x <<<<,构建()()()()11,0,1g x f x f x x =+--∈,因为()()()()()()211ln 1ln 1ln 10g x f x f x x x x '''=++-=-+--=-->在()0,1上恒成立,则()g x 在()0,1上单调递增,可得()()00g x g >=,所以()()()11,0,1f x f x x +>-∈,即()()()2,0,1f x f x x ->∈,可得2111112f f f x x x ⎛⎫⎛⎫⎛⎫=<-⎪ ⎪ ⎝⎭⎝⎭⎝⎭,注意到()f x 在()1,+∞上单调递减,且1211122,1e x x <-<<<,所以21112x x >-,即12112x x +>,故D 正确;故选:ACD.【点睛】方法点睛:利用导数证明不等式的基本步骤(1)作差或变形;(2)构造新的函数()h x ;(3)利用导数研究()h x 的单调性或最值;(4)根据单调性及最值,得到所证不等式.特别地:当作差或变形构造的新函数不能利用导数求解时,一般转化为分别求左、右两端两个函数的最值问题.第Ⅱ卷二、填空题:本题共4小题,每小题5分,共20分易知()(),0,,0A a F c -,则过点不妨设x a =与渐近线by x a=交于点又2FN FM = 可得,N 为FM 的中点,即又N 在另一条渐近线by x a =-上,即所以双曲线C 的离心率为ce a=则三棱锥-P ABC 外接球的直径为22R PA =因此,三棱锥-P ABC 外接球的体积为34π3R =故答案为:9π2.三、解答题(本题共6小题,共70分,解答应写出文字说明、证明过程或演算步骤.第17~21题为必考题,每个试题考生都必须作答.第22、23题为选考题,考生根据要求作答)(一)必考题:共60分17.已知数列{}n a 满足15a =,123n n n a a +-=((1)求证:{}n b 是等比数列;(2)设n n c nb =,求数列{}n c 的前n 项和.【答案】(1)证明见解析(1)证明:FO⊥平面ABC.--的余弦值.(2)求二面角E FA C【答案】(1)证明见解析(2)32⊥,再由勾股定理逆定理得出【分析】(1)由等边三角形三线合一,得出FO AC(2)方法一:建立空间直角坐标系,由面面夹角的向量法计算即可;方法二:作则()0,2,0A -,42,,033E ⎛⎫⎪⎝⎭,(0,0,F 所以()0,2,23AF =,48,33AE ⎛= ⎝ 设平面FAE 的法向量为(,,n x y z =由00AF n AE n ⎧⋅=⎪⎨⋅=⎪⎩ ,得223048033y z x y ⎧+=⎪⎨+=⎪⎩,令20.已知动圆P经过点()1,0N,并且与圆(1)求点P的轨迹C的方程;(2)动直线l过点()0,1A,且与轨迹求证:直线QT恒过定点.【答案】(1)221 43x y+=(2)证明见解析(2)由题意可知直线QT的斜率显然不为不妨设直线QT的方程为x my=+联立22143x yx my t⎧+=⎪⎨⎪=+⎩,消去x整理得所以212231234ty ym-=+,123y ym-+=y21.已知函数()(3ln 10f x ax x a a =+(1)讨论()f x 的单调性.(2)若函数()f x 有两个零点1x x ,【答案】(1)答案见解析(2)证明见解析【分析】(1)先求导函数,对参数(二)选考题:共10分.请考生在第22、23题中任选一题作答.如果多做,则按所做的第一题计分.[坐标系与参数方程][不等式选讲]-∞.综上,a的取值范围是(],3。
高二(新高三)一轮复习主题班会课件
题海战术是大家最容易落入的“陷阱”!很多同学认为成绩提高不 了,是因为题目做得不够多!但是做题不分析不思考,同样的题目错多 遍又有什么实际的意义呢,想要学会知识,必须通过老师的“点拨” 和学生的“思考”,做题只是为了提高做题的熟练度和综合应用。
所以,盲目做题没有针对性和全面性。一定数量的题目是需 要做的,但做题的同时也要思考出题者的意图。
比如发现现阶段复习过程中存在的问题,对阶段性复习效果的检测, 通过测试,可以及时发现自己的不足和存在问题,存在的问题可能是知识 方面的、应试技能方面的、应试规范性方面的、还有是应试心理方面的。
如果一味的沉迷于分数的多少,势必分散精力,浪费时间。所以,测 试的目的是为了分析,在之后的复习中,考生可根据对分析,得知自己具 体哪些方面做得不足,需要及时调整,备战高考。
八大误区:三、脱离老师,忽视课堂
高三要更重视老师在课堂说的每一句话!
尖子生很容易犯这个错误,因为尖子生已经领先于很多人,而老师的课堂 讲解多针对于绝多数学生的学习进程,所以尖子生理所应当的认为老师的讲解 已经不适合自己了,其实不然!据调查发现,90%以上的高考状元最注重的都是 课堂的听讲,而不是为赶进程在课堂上做其他科目的习题。
中学第一备考即将开始, 你进入高三党的状态了吗?你打算怎么复 习?
一轮复习首先是要回顾高一、高二所学的知识,并加以巩 固。一轮复习的特点是历时长、任务重、训练多、精细化、潜 增长,在高考复习中起决定性作用。时间宝贵,复习中要小心 这八大误区,千万别犯,让我给大家讲解一下都是哪八大误区。
八大误区:一、对时间认知误区
给新高三的演讲稿
给新高三的演讲稿
尊敬的老师、亲爱的同学们:
大家好!今天,我站在这里,非常荣幸有机会给新高三的同学
们做一次演讲。
新的高三学习生活即将开始,我想和大家分享一些
我对高三学习生活的看法和建议。
首先,我想说的是,高三是人生中非常重要的一年。
在这一年里,我们将面临着高考的挑战,这是我们人生道路上的一次重要考验。
因此,我们需要时刻保持清醒的头脑和饱满的热情,努力学习,为自己的未来打下坚实的基础。
其次,高三是一个紧张而充实的学习阶段。
我们需要面对大量
的知识,需要不断地复习和总结。
在这个阶段,我们需要做好时间
规划,合理安排每一天的学习和生活,充分利用每一分钟,争取取
得更好的成绩。
另外,高三也是一个团结合作的阶段。
我们需要相互帮助,共
同进步。
在学习上,我们可以相互讨论,共同解决难题;在生活上,我们可以互相鼓励,共同面对压力。
团结合作,才能更好地度过高
三这一段特殊的时期。
最后,我想告诉大家,高三不仅仅是学习的时间,更是我们成
长的时间。
在这一年里,我们将面对各种各样的挑战和困难,但是
只要我们坚定信心,勇敢前行,我们一定能够战胜一切困难,迎接
美好的未来。
最后,我希望同学们能够在高三学习生活中,保持积极的心态,努力拼搏,相信自己,相信团队,相信未来。
让我们一起为梦想努力,为未来奋斗!
谢谢大家!祝愿大家在新的高三学习生活中取得优异的成绩!。
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单项选择1.The young man has put on __weight since he gave up __smoking.A.the;theB. /;/C. the;/D./;the2.The young soldier risked __burned and rushed into the burning house to save the old woman.A.getB.to getC.gotD.getting3.Mr Johnson, the general manager,__from his bad cold and can attend the meeting tomorrow.A.recoveredB.had recoveredC.has recoveredD.has been recovered4.Knowing that his best friend has got a serious disease, she stood there,____.A.amazed and frightenedB.amazing and frighteningC.amazing and frighteninglyD.amaze and frighten5.The helicopter___in no time after the pilot got the order.A.turned offB.put offC.took offD.broke off6.--Mary would not have got into trouble if she ___her mother‟s advice.A.have takenB.had takenC.tookD.would take7.Although she did not know Boston well, she made her way ___to the Home Circle Building.A.easy enoughB.enough easyC.easily enoughD.enough easily8.The husband and wife returned home before the war___in 1939.A.was broken outB.was being broken outC.broke outD.had broken out9.There were two witnesses who happened___by when the accident.A.to standB.to be standingC.stoodD. to have stood10.--I promised to help Linda,but now I do not want to do so.--But I think you should not ___. A.back out B.fill out C.pull out D.work out完形填空As we all know “ The hand that rocks the cradle rules the world.” and “ 1 every successful man t here is a woman.” Both these 2 mean the same things. Men rule the 3 , but their wives rule them.Chinese people and other foreigners often say, 4 of the American women like making their husbands and sons successful, but some of them want 5 for themselves. They want good 6 . When they work they want to 7_ better paid. They want to be as 8__ as men.In the 1960s, the American women‟s liberation 9 was started by women who don‟t want to 10 behind successful men. They want to stand beside them, with the same 11__ for success. They don‟t want to be told that certain jobs or 12_ are closed to them. They refused to work side by side with men who do the 13 work for higher pay.In America, a liberation woman must be 14 of being a woman andh ave confidence in herself. If somebody says to her, “ You have come a long15 , baby”, she will 16 and answer, “Not nearly as 17 as I am going to go, baby.”On the other hand , this movement is quite 18 and many American women do not agree. 19 it has already made some important 20 in women‟s lives.1. A. Before B. Beside C. Behind D. Near2.A. writings B. words C. letters D. sayings3.A. family B. world C. earth D. society4.A. most B. few C. all D. None5.A. anything B. nothing C. something D. everything6.A. jobs B. clothes C. food D. Houses7.A. have B. make C. receive D. be8.A. good B. successful C. wonderful D. much9.A. activity B. affairs C. movement D. incident10.A. cooperate B. work C. help D. stand11.A. work B. job C. position D. chance12.A. offices B. schools C. shops D. places13.A. better B. same C. less D. important14.A. tired B. afraid C. proud D. fond15.A. place B. walk C. way D. journey16.A. smile B. cry C. sob D. laugh17.A. long B. far C. soon D. much18.A. new B. good C. important D. pleasing19.A. So B. And C. But D. Or20.A. progress B. improvement C. decisions D. changes阅读理解AFar more people in India have access to a mobile phone than to a toilet, according to a UN study.India's mobile users totaled 563.73 million at the last count, enough to serve nearly half of the country's population.But just 366 million people-around a third of the population-had access to proper sanitation (卫生设施) in 2008, said the study published by the UN University, a UN think tank."It is a tragic irony (讽刺) to think in India, a country now wealthy enough that roughly half of the people own phones, so many people cannot afford the basic necessity and quality of a toilet, " said UN University director Zafar Adeel.Adeel heads the UN University's Institute for Water, Environment and Health, based in the Canadian city of Hamilton, which prepared the report.Worldwide, an estimated 358 billion dollars is needed between now and 2015 to achieve the UN Millennium Development Goal (MDG) of halving the proportion of people with inadequate (不充分的) sanitation from 2000 levels."Proper sanitation could do more to save lives, especially those of young people, improve health and help pull India and other countries in similar circumstances out of poverty than any alternative investment, " Adeel said.Poor sanitation is a major contributor to waterborne diseases (水传播疾病), which in the past three years alone killed an estimated 4.5 million children under the age of five worldwide, according to the study.The report gave a rough cost of 300 dollars to build a toilet, including labor, and materials.The world could expect a return of up to 34 dollars for every dollar spent on sanitation through improved productivity and reduced poverty and health costs, said Adeel.He said improving sanitation was an economic and humanitarian opportunity of historic proportions.1. The population of India is about________.A. less than 1 billionB. about 1.2 billionC. 900 millionD. 800 million2. From Paragraph 4, we can draw a conclusion that________.A. India is so poor that they can't afford the basic necessity and quality of a toiletB. a mobile phone is more important than a toiletC. it's normal in Indian that they can't attach importance to toiletsD. Zafar Adeel wasn't satisfied with the sanitary situation in India3. Improving sanitation can play an important part in the followingEXCEPT________.A. preventing waterborne diseasesB. saving lives of young peopleC. pulling developing countries out of povertyD. improving the quality of mobile phone and getting more information4. According to the last paragraph, if the government put into $10,000 on sanitation, they can get a return of________.A. $3,000,000B. $10,000C. $340,000D. $10,200BLaws that would have ensured pupils from five to 16 received a full financial education got lost in the …wash up‟. An applica tion is calling on the next government to bring it back.At school the children are taught to add up and subtract(减法) but, extraordinarily, are not routinely shown how to open a bank account —let alone how to manage their finances in an increasingly complex and demanding world.Today the parenting website Mums-net and the consumer campaigner Martin Lewis have joined forces to launch an online application to make financial education a compulsory element of the school curriculum in England. Children from five to 16 should be taught about everything from pocket money to pensions, they say. And that was exactly the plan preserved in the Children, Schools and Families bill that was shelved by the government in the so-called “wash-up” earlier this month — the rush to legislation before parliament was dismissed. Consumer and parent groups believe financial education has always been one of the most frustrating omissions of the curriculum.As the Personal Finance Education Group (Pfeg) points out, the good habits of young children do not last long. Over 75% of seven- to 11-year-olds are savers but by the time they get to 17, over half of them are in debt to family and friends. By this age, 26% see a credit card or overdraft(透支) as a way of extending their spending power. Pfeg predicts that these young people will “find it much harder to avoid the serious unexpected dangers that have befallen many of their parents' generation unless they receive good quality financial education while at school.”The UK has been in the worst financial recession(衰退)for generations. It does seem odd that —unless parents step in —young people are left in the dark until they are cruelly introduced to the world of debt when they turn up at university. In a recent poll of over 8,000 people, 97% supported financial education in schools, while 3% said it was a job for parents.1. The passage is mainly about _____________.A. how to manage school lessonsB. how to deal with the financial crisisC. teaching young people about moneyD. teaching students how to study effectively2. It can be inferred from the first two paragraphs that __________.A. the author complains about the school educationB. pupils should not be taught to add up and subtractC. students have been taught to manage their financesD. laws on financial education have been effectively carried out3. The website and the consumer campaigner joined to _________.A. instruct the pupils to donate their pocket moneyB. promote the connection of schools and familiesC. ask the government to dismiss the parliamentD. appeal for the curriculum of financial education4. According to Pfeg, ___________.A. it is easy to keep good habits longB. teenagers spend their money as plannedC. parents are willing to pay the debt for their kidsD. it will be in trouble if the teenagers are left alone5. A poll is mentioned to ___________.A. stress the necessity of the curriculum reformB. show the seriousness of the financial recessionC. make the readers aware of burden of the parentsD. illustrate some people are strongly against the proposalCEuropeans should try to stay indoors if ash from Iceland's volcano starts settling, the World Health Organization warned Friday as small amounts fell in Iceland, Scotland and Norway.WHO spokesman Daniel Epstein said the microscopic(微小的) ash is potentially dangerous for people when it starts to reach the Earth because inhaled(吸入) particles can enter the lungs and cause respiratory problems. And he also said Europeans who go outside might want to consider wearing a mask.Other experts, however, weren't convinced the volcanic ash would have a major effect on peoples' health and said WHO's warnings were "hysterical." They said volcanic ash was much less dangerous than cigarette smoke or pollution. V olcanic ash is made of fine particles of fragmented volcanic rock. It is light gray to black and can be as fine as talcum powder. During a volcanic eruption, the ash can be breathed deep into the lungs and cause irritation even in healthy people. But once it falls from a greater distance —like from the cloud currently hovering above Europe —its health effects are often minimal, experts say."Not all particles are created equal," said Ken Donaldson, a professor of respiratory toxicology at the University of Edinburgh, "In the great scheme of things, volcanic ash is not all that harmful." And he said most Europeans' exposure to volcanic ash would be negligible and that only those in the near districts of the Icelandic volcano would likely be at risk.Dr. Stephen Spiro, a professor of respiratory medicine and deputy chair of the British Lung Foundation, said the further the particles travel, the less dangerous they will be. "The cloud has already passed over northern Scotland and we haven't heard of any ill effects there," he said. Spiro said to wear masks or stay indoors to avoid volcanic ash was "over the top" and "a bit hysterical."1. The text is mainly about .A. the effect of volcanic ashB. the health risk of volcanic ashC. the disadvantages of volcanic ashD. the opinions on health risk of volcanic ash2. Which one is true according to Paragraph3?A. The volcanic ash’s effects on Europeans were little.B. The ash caused irritation even in healthy people.C. Other experts thought WTO’S warnings were useful.D. The volcanic ash was more dangerous than cigarette smoke or pollution.3. The underlined word “hysterical”in Paragraph4 most probably means .A. amazingB. practicalC. valuableD. overstated4. What can we learn from the passage?A. The volcanic ash would not be harmful to people.B. All experts thought the volcanic ash did great harm to our health.C. People close to the volcano would likely be at risk according to some experts.D. Europeans should stay indoors because Iceland's volcano starts settling.DFear and its companion pain are two of the most useful things that man and animals possess if they are used. If fire did not hurt when it burned, children would play with it until their hands were burned away. Similarly, if pain existed but fear did not, a child could burn itself again and again because fear would not warn it to keep away from the fire that had burnt it before. A really fearless soldier—and some do exist—is not a good soldier because he is soon killed; and a dead soldier is of no use to his army. Fear and pain are therefore two guards without which man and animals might soon die out.In our first sentence we suggested that fear ought to be properly used. If, for example, you never go out of your house because of the danger of being knocked down and killed in the street by a car, you are letting fear rule you too much. The important thing is not to let fear rule you, but instead, to use fear as your servant and guide. Fear will warn you of dangers; then you have to decide what action to take.In many cases, you can take quick and successful action to avoid the danger. For example, you see a car coming straight towards you; fear warns you, you jump out of the way, and all is well.In some cases, however, you decide that there is nothing that you can do to avoid the danger. For example, you cannot prevent an airplane crashing into your house, and you may not want to go and live in a desert where there are no airplanes. In this case, fear has given you its warning, you have examined it and decided on your course of action, so fear of the particular danger is no longer of any use to you, and you have to try to overcome it.1. Children would play with fire until their hands are burnt away if _________.A. they were not well educated at schoolB. they had never played with fire beforeC. they had no sense of painD. they were fearful of pain2. People sometimes succeed in timely avoiding danger because _________.A. they have gained experienceB. they are warned of the danger and take quick actionC. they jump out of the way in timeD. they are calm in face of danger3. What is implied but not stated in the passage?A. Too much fear is harmfulB. Fear is always something helpfulC . Fear is something that can be avoided D. Fear ought to be used as our guide in our life4. The best title for this passage should be __________.A. No Pains, No GainsB. Pain and ActionsC. The Value of Fear D . The Reason Why People Fear七选五根据短文内容,从短文后的A-G选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。