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新人教版高中英语选修2Unit 4 Journey Across a Vast Land教学设计
当孩子们由父母陪同时，他们才被允许进入这个运动场。3．过去分词(短语)作状语时的几种特殊情况(1)过去分词(短语)在句中作时间、条件、原因、让步状语时，相当于对应的时间、条件、原因及让步状语从句。Seen from the top of the mountain (＝When it is seen from the top of the mountain), the whole town looks more beautiful.从山顶上看，整个城市看起来更美了。Given ten more minutes (＝If we are given ten more minutes), we will finish the work perfectly.如果多给十分钟，我们会完美地完成这项工作。Greatly touched by his words (＝Because she was greatly touched by his words), she was full of tears.由于被他的话深深地感动，她满眼泪花。Warned of the storm (＝Though they were warned of the storm), the farmers were still working on the farm.尽管被警告了风暴的到来，但农民们仍在农场干活。(2)过去分词(短语)在句中作伴随、方式等状语时，可改为句子的并列谓语或改为并列分句。The teacher came into the room, followed by two students (＝and was followed by two students)．后面跟着两个学生，老师走进了房间。He spent the whole afternoon, accompanied by his mom(＝and was accompanied by his mom)．他由母亲陪着度过了一整个下午。
新人教版高中英语选修2Unit 1 Science and Scientists-Learning about Language教学设计
Step 7: complete the discourse according to the grammar rules.Cholera used to be one of the most 1.__________ (fear) diseases in the world. In the early 19th century, _2_________ an outbreak of cholera hit Europe, millions of people died. But neither its cause, 3__________ its cure was understood. A British doctor, John Snow, wanted to solve the problem and he knew that cholera would not be controlled _4_________ its cause was found. In general, there were two contradictory theories 5 __________ explained how cholera spread. The first suggested that bad air caused the disease. The second was that cholera was caused by an _6_________(infect) from germs in food or water. John Snow thought that the second theory was correct but he needed proof. So when another outbreak of cholera hit London in 1854, he began to investigate. Later, with all the evidence he _7_________ (gather), John Snow was able to announce that the pump water carried cholera germs. Therefore, he had the handle of the pump _8_________ (remove) so that it couldn't be used. Through his intervention，the disease was stopped in its tracks. What is more, John Snow found that some companies sold water from the River Thames that __9__________________ (pollute) by raw waste. The people who drank this water were much more likely _10_________ (get) cholera than those who drank pure or boiled water. Through John Snow's efforts, the _11_________ (threaten) of cholera around the world saw a substantial increase. Keys： 1.feared 2.when 3. nor 4.unless 5.that/which 6.infection 7.had gathered 8.removed 9.was polluted 10.to get 11. threat
新人教版高中英语选修2Unit 1 Science and Scientists-Reading and thinking教学设计
Step 5： After learning the text, discuss with your peers about the following questions:1.John Snow believed Idea 2 was right. How did he finally prove it?2. Do you think John Snow would have solved this problem without the map?3. Cholera is a 19th century disease. What disease do you think is similar to cholera today?SARS and Covid-19 because they are both deadly and fatally infectious, have an unknown cause and need serious public health care to solve them urgently.keys:1. John Snow finally proved his idea because he found an outbreak that was clearly related to cholera, collected information and was able to tie cases outside the area to the polluted water.2. No. The map helped John Snow organize his ideas. He was able to identify those households that had had many deaths and check their water-drinking habits. He identified those houses that had had no deaths and surveyed their drinking habits. The evidence clearly pointed to the polluted water being the cause.3. SARS and Covid-19 because they are both deadly and fatally infectious, have an unknown cause and need serious public health care to solve them urgently.Step 6: Consolidate what you have learned by filling in the blanks:John Snow was a well-known _1___ in London in the _2__ century. He wanted to find the _3_____ of cholera in order to help people ___4_____ it. In 1854 when a cholera __5__ London, he began to gather information. He ___6__ on a map ___7___ all the dead people had lived and he found that many people who had ___8____ (drink) the dirty water from the __9____ died. So he decided that the polluted water ___10____ cholera. He suggested that the ___11__ of all water supplies should be _12______ and new methods of dealing with ____13___ water be found. Finally, “King Cholera” was __14_____.Keys: 1. doctor 2. 19th 3.cause 4.infected with 5.hit 6.marked 7.where 8.drunk 9.pump 10.carried 11.source 12.examined 13.polluted 14.defeatedHomework: Retell the text after class and preview its language points
新人教版高中英语选修2Unit 1 Science and Scientists-Using langauge教学设计
This happens because the dish soap molecules have a strong negative charge, and the milk molecules have a strong positive charge. Like magnets, these molecules are attracted to each other, and so they appear to move around on the plate, taking the food coloring with them, making it look like the colors are quickly moving to escape from the soap.Listening text:? Judy: Oh, I'm so sorry that you were ill and couldn't come with us on our field trip. How are you feeling now? Better?? Bill: Much better, thanks. But how was it?? Judy: Wonderful! I especially liked an area of the museum called Light Games.it was really cool. They had a hall of mirrors where I could see myself reflected thousands of times!? Bill: A hall of mirrors can be a lot of fun. What else did they have?? Judy: Well, they had an experiment where we looked at a blue screen for a while, and then suddenly we could see tiny bright lights moving around on it. You'll never guess what those bright lights were!? Bill: Come on, tell me!? Judy: They were our own blood cells. For some reason, our eyes play tricks on us when we look at a blue screen, and we can see our own blood cells moving around like little lights! But there was another thing I liked better. I stood in front of a white light, and it cast different shadows of me in every color of the rainbow!? Bill: Oh, I wish I had been there. Tell me more!? Judy: Well, they had another area for sound. They had a giant piano keyboard that you could use your feet to play. But then, instead of playing the sounds of a piano, it played the voices of classical singers! Then they had a giant dish, and when you spoke into it, it reflected the sound back and made it louder. You could use it to speak in a whisper to someone 17 meters away.? Bill: It all sounds so cool. I wish I could have gone with you? Judy: I know, but we can go together this weekend. I'd love to go there again!? Bill: That sounds like a great idea!
新人教版高中英语选修2Unit 2 Bridging Cultures-Discovering useful structures教学设计
The grammar of this unit is designed to review noun clauses. Sentences that use nouns in a sentence are called noun clauses. Nominal clauses can act as subject, object, predicate, appositive and other components in compound sentences. According to the above-mentioned different grammatical functions, nominal clauses are divided into subject clause, object clause, predicate clause and appositive clause. In this unit, we will review the three kinds of nominal clauses. Appositive clauses are not required to be mastered in the optional compulsory stage, so they are not involved.1. Guide the students to judge the compound sentences and determine the composition of the clauses in the sentence.2. Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.3. Inspire the students to systematize the function and usage of noun clause1.Instruct students to try to learn grammar by generalizing grammar rules, controlling written practice, and semi-open oral output.2.Inspire the students to systematize the function and usage of noun clauseStep1: The teacher ask studetns to find out more nominal clauses from the reading passage and udnerline the nominal clauses.
新人教版高中英语选修2Unit 3 Food and Culture-Discovering useful structures教学设计
The newspaper reported more than 100 people had been killed in the thunderstorm.报纸报道说有一百多人在暴风雨中丧生。(2)before、when、by the time、until、after、once等引导的时间状语从句的谓语是一般过去时，以及by、before后面接过去的时间时，主句动作发生在从句的动作或过去的时间之前且表示被动时，要用过去完成时的被动语态。By the time my brother was 10, he had been sent to Italy.我弟弟10岁前就已经被送到意大利了。Tons of rice had been produced by the end of last month. 到上月底已生产了好几吨大米。(3) It was the first/second/last ... time that ...句中that引导的定语从句中，主语与谓语构成被动关系时，要用过去完成时的被动语态。It was the first time that I had seen the night fact to face in one and a half years. 这是我一年半以来第一次亲眼目睹夜晚的景色。(4)在虚拟语气中，条件句表示与过去事实相反，且主语与谓语构成被动关系时，要用过去完成时的被动语态。If I had been instructed by him earlier, I would have finished the task.如果我早一点得到他的指示，我早就完成这项任务了。If I had hurried, I wouldn't have missed the train.如果我快点的话，我就不会误了火车。If you had been at the party, you would have met him. 如果你去了晚会，你就会见到他的。
新人教版高中英语选修2Unit 3 Food and Culture-Reading and thinking教学设计
The discourse explores the link between food and culture from a foreign’s perspective and it records some authentic Chinese food and illustrates the cultural meaning, gerography features and historic tradition that the food reflects. It is aimed to lead students to understand and think about the connection between food and culture. While teaching, the teacher should instruct students to find out the writing order and the writer’s experieces and feelings towards Chinese food and culture.1.Guide the students to read the text, sort out the information and dig out the topic.2.Understand the cultural connotation, regional characteristics and historical tradition of Chinese cuisine3.Understand and explore the relationship between food and people's personality4.Guide the students to use the cohesive words in the text5.Lead students to accurately grasp the real meaning of the information and improve the overall understanding ability by understanding the implied meaning behind the text.1. Enable the Ss to understand the structure and the writing style of the passage well.2. Lead the Ss to understand and think further about the connection between food and geography and local character traits.Step1: Prediction before reading. Before you read, look at the title, and the picture. What do you think this article is about?keys:It is about various culture and cuisine about a place or some countries.
新人教版高中英语选修2Unit 5 First Aid-Discovering useful structures教学设计
You have no excuse for not going.你没有理由不去。He was punished for not having finished his homework.他因未完成作业而受到惩罚。2．动词ing形式复合结构由物主代词或人称代词宾格、名词所有格或普通格加动词ing，即“sb./sb.'s＋doing”构成。动词ing形式的复合结构实际上是给动词ing形式加了一个逻辑主语。动词ing形式的复合结构有四种形式：①形容词性物主代词＋动词ing②名词所有格＋动词ing③代词宾格＋动词ing④名词＋动词ingHer coming to help encouraged all of us.她来帮忙鼓舞了我们所有人。The baby was made awake by the door suddenly shutting.这个婴儿被突然的关门声吵醒了。Can you imagine him/Jack cooking at home?你能想象他/杰克在家做饭的样子吗？无生命名词无论是作主语还是作宾语都不能用第②种形式。Tom's winning first prize last year impressed me a lot.汤姆去年得了一等奖使我印象深刻。Do you mind my/me/Jack's/Jack leaving now?你介意我/杰克现在离开吗？Excuse me for my not coming on time．很抱歉我没能按时来。His father's being ill made him worried.他父亲病了，他很担心。We are looking forward to the singer's/the singer to give us a concert.我们盼望着这位歌手来给我们举办一场演唱会。
北师大初中七年级数学上册频数直方图教案2
［师］同学们想一想，你同父母一起去商店买衣服时，衣服上的号码都有哪些，标志是什么？［生］我看到有些衣服上标有M、S、L、XL、XXL等号码.但我不清楚代表的具体范围.适合什么人穿.但肯定与身高、胖瘦有关.［师］这位同学很善动脑，也爱观察. S代表最小号，身高在150~155 cm的人适合穿S号.M号适合身高在155~160 cm的人群着装…….厂家做衣服订尺寸也并不是按所有人的尺寸定做，而是按某个范围分组批量生产.如何确定组距与组数呢？分组组数的确定，不仅与数据多少有关，还与数据的取值情况有关.在实际决定组数时，常有一个尝试过程：先定组距，再计算出相应的组数.看看这个组数是否大致符合确定组数的经验法则.在尝试中，往往要比较相应于几个组距的组数，然后从中选定一个较为合适的组数.我们一起看下表：小亮的做法.
北师大初中数学八年级上册平均数1教案
解析：本题是要求两个未知数，即3和4的权．所以应把平均数与方程组综合起来，利用平均数的定义来列方程，组成方程组求解．解：设投进3个球的有x人，投进4个球的有y人，由题意，得3x＋4y＋5×2＝3.5×（x＋y＋2），0×1＋1×2＋2×7＋3x＋4y＝2.5×（1＋2＋7＋x＋y）.整理，得x－y＝6，x＋3y＝18.解得x＝9，y＝3.答：投进3个球的有9人，投进4个球的有3人．方法总结：利用平均数的公式解题时，要弄清数据及相应的权，避免出错．三、板书设计平均数算术平均数：x＝1n（x1＋x2＋…＋xn）加权平均数：x＝（x1f1＋x2f2＋…＋xnfn）f1＋f2＋…fn通过探索算术平均数和加权平均数的联系与区别，培养学生的思维能力；通过有关平均数问题的解决，提升学生的数学应用能力．通过解决实际问题，体会数学与社会生活的密切联系，了解数学的价值，增进学生对数学的理解和增加学好数学的信心．
北师大初中数学八年级上册算术平方根2教案
1．细讲概念、强化训练要想让学生正确、牢固地树立起算术平方根的概念，需要由浅入深、不断深化的过程．概念是由具体到抽象、由特殊到一般，经过分析、综合去掉非本质特征，保持本质属性而形成的．概念的形成过程也是思维过程，加强概念形成过程的教学，对提高学生的思维水平是很有必要的．概念教学过程中要做到：讲清概念，加强训练，逐步深化．“讲清概念”就是通过具体实例揭露算术平方根的本质特征．算术平方根的本质特征就是定义中指出的：“如果一个正数 的平方等于 ，即 ，那么这个正数 就叫做 的算术平方根，”的“正数 ”，即被开方数是正的，由平方的意义， 也是正数，因此算术平方根也必须是正的．当然零的算术平方根是零.
北师大初中数学八年级上册确定位置1教案
解析：要在地球仪上确定南昌市的位置，需要知道它的经纬度，故选D.方法总结：本题考查了坐标确定位置，熟记位置的确定需要横向与纵向的两个数据是解题的关键．【类型二】 用“区域定位法”确定位置如图所示是某市区的部分简图，文化宫在D2区，体育场在C4区，据此说明医院在________区，阳光中学在________区．解析：本题首先给出的是表示文化宫和体育场的位置，即D2区和C4区，这就确定了本题中表示建筑物位置的方法，即字母表示列数，数字表示行数．故填A3，D5.方法总结：解此类题先要弄清区域定位法中字母及数字各自表示的含义，再用已知的表示方法来确定相关位置．三、板书设计确定位置有序实数对方位法经纬度区域定位法将现实生活中常用的定位方法呈现给学生，进一步丰富学生的数学活动经验，培养学生观察、分析、归纳、概括的能力．教学过程中创设生动活泼、直观形象、且贴近他们生活的问题情境；另一方面，为学生创造自主学习、合作交流的机会，促使他们主动参与、积极探究．
北师大初中数学九年级上册黄金分割2教案
2.如何找一条线段的黄金分割点，以及会画黄金矩形.3.能根据定义判断某一点是否为一条线段的黄金分割点.Ⅳ.课后作业习题4.8Ⅴ.活动与探究要配制一种新农药，需要兑水稀释，兑多少才好呢？太浓太稀都不行.什么比例最合适，要通过试验来确定.如果知道稀释的倍数在1000和2000之间，那么，可以把1000和2000看作线段的两个端点，选择AB的黄金分割点C作为第一个试验点，C点的数值可以算是1000+（2000－1000）×0.618= 1618.试验的结果，如果按1618倍，水兑得过多，稀释效果不理想，可以进行第二次试 验.这次的试验点应该选AC的黄金分割点D，D的位置是1000+（1618－1000）×0.618，约等于1382，如果D点还不理想，可以按黄金分割的方法继续试验下去.如果太浓，可以选DC之间的黄金分割 点 ；如果太稀，可以选AD之间的黄金分割点，用这样的方法，可以较快地找到合适的浓度数据.这种方法叫做“黄金分割法”.用这样的方法进行科学试验，可以用最少的试验次数找到最佳的数据，既节省了时间，也节约了原材料.●板书设计
北师大初中数学九年级上册反比例函数2教案
2、某村有耕地346.2公顷，人口数量n逐年发生变化，那么该村人均占有耕地面积m（公顷/人）是全村人口数n的函数吗？是反比例函数吗？为什么？3、y是x的反比例函数，下表给出了x与y的一些值： （1）写出这个反比例函数的表达式；（2）根据表达式完成上表。教师巡视个别辅导，学生完毕教师给予评估肯定。II巩固练习：限时完成课本“随堂练习”1-2题。教师并给予指导。七、总结、提高。（结合板书小结）今天通过生活中的例子，探索学习了反比例函数的概念，我们要掌握反比例函数是针对两种变化量，并且这两个变化的量可以写成 （k为常数，k≠0）同时要注意几点：：①常数k≠0；②自变量x不能为零（因为分母为0时，该式没意义）；③当 可写为 时注意x的指数为—1。④由定义不难看出，k可以从两个变量相对应 的任意一对对应值的积来求得，只要k确定了，这个函数就确定了。
北师大初中数学九年级上册矩形的性质1教案
解：∵四边形ABCD是矩形，∴AD∥BC，∠A＝90°，∴∠2＝∠3.又由折叠知△BC′D≌△BCD，∴∠1＝∠2.∴∠1＝∠3.∴BE＝DE.设BE＝DE＝x，则AE＝8－x.∵在Rt△ABE中，AB2＋AE2＝BE2，∴42＋(8－x)2＝x2.解得x＝5，即DE＝5.∴S△BED＝12DE·AB＝12×5×4＝10.方法总结：矩形的折叠问题是常见的问题，本题的易错点是对△BED是等腰三角形认识不足，解题的关键是对折叠后的几何形状要有一个正确的分析．三、板书设计矩形矩形的定义：有一个角是直角的平行四边形 叫做矩形矩形的性质四个角都是直角两组对边分别平行且相等对角线互相平分且相等经历矩形的概念和性质的探索过程，把握平行四边形的演变过程，迁移到矩形的概念与性质上来，明确矩形是特殊的平行四边形．培养学生的推理能力以及自主合作精神，掌握几何思维方法，体会逻辑推理的思维价值.
北师大初中数学九年级上册矩形的判定2教案
2．已知：如图 ，在△ABC中，∠C＝90°， CD为中线，延长CD到点E，使得 DE＝CD．连结AE，BE，则四边形ACBE为矩形吗？说明理由。答案：四边形ACBE是矩形.因为CD是Rt△ACB斜边上的中线，所以DA=DC=DB,又因为DE=CD，所以DA=DC=DB=DE,所以四边形ABCD是矩形（对角线相等且互相平分的四边形是矩形）。四、课堂检测：1．下列说法正确的是（ ）A.有一组对角是直角的四边形一定是矩形 B.有一组邻角是直角的四边形一定是矩形C.对角线互相平分的四边形是矩形 D.对角互补的平行四边形是矩形2. 矩形各角平分线围成的四边形是（ ）A.平行四边形 B.矩形 C.菱形 D.正方形3. 下列判定矩形的说法是否正确（1）有一个角是直角的四边形是矩形 （ ）（2）四个角都是直角的四边形是矩形 （ ）（3）四个角都相等的四边形是矩形 （ ） （4）对角线相等的四边形是矩形 （ ）（5）对角线相等且互相垂直的四边形是矩形 （ ）（6）对角线相等且互相平分的四边形是矩形 （ ）4. 在四边形ABCD中，AB=DC，AD=BC.请再添加一个条件，使四边形ABCD是矩形.你添加的条件是 .(写出一种即可)
北师大初中数学九年级上册菱形的判定2教案
方法三：一个同学先画两条等长的线段AB、AD，然后分别以B、D为圆心，AB为半径画弧，得到两弧的交点C，连接BC、CD，就得到了一个四边形，猜一猜，这是什么四边形？请你画一画。通过探究，得到： 的四边形是菱形。证明上述结论：三、例题巩固课本6页例2 四、课堂检测1、下列判别错误的是( )A.对角线互相垂直,平分的四边形是菱形. B、对角线互相垂直的平行四边形是菱形C.有一条对角线平分一组对角的四边形是菱形. D.邻边相等的平行四边形是菱形.2、下列条件中，可以判定一个四边形是菱形的是（ ）A.两条对角线相等 B.两条对角线互相垂直C.两条对角线相等且垂直 D.两条对角线互相垂直平分3、要判断一个四边形是菱形，可以首先判断它是一个平行四边形，然后再判定这个四边形的一组__________或两条对角线__________.4、已知：如图 ABCD的对角线AC的垂直平分线与边AD、BC分别交于E、F求证：四边形AFCE是菱形
北师大初中数学九年级上册相似多边形2教案
(2)相似多边形的对应边的比称为相似比；(3)当相似比为1时，两个多边形全等．二、运用相似多边形的性质．活动3 例：如图27.1-6，四边形ABCD和EFGH相似，求角 的大小和EH的长度 ．27.1-6教师活动:教师出示例题，提出问题；学生活动:学生通过例题运用相似多边形的性质，正确解答出角 的大小和EH的长度 ．(2人板演)活动41．在比例尺为1﹕10 000 000的地图上，量得甲、乙两地的距离是30 cm，求两地的实际距离．2．如图所示的两个直角三角形相似吗？为什么？3．如图所示的两个五边形相似，求未知边 、 、 、 的长度．教师活动:在活动中,教师应重点关注：（1）学生参与活动的热情及语言归纳数学结论的能力；（2）学生对于相似多边形的性质的掌握情况．三、回顾与反思．(1)谈谈本节课你有哪些收获．(2)布置课外作业：教材P88页习题4.4
北师大初中数学九年级上册比例的性质2教案
请写出 推理过程：∵ ，在两边同时加上1得， + = + .两边分别通分得： 思考：请仿照上面的方法，证明“如果 ，那么 ”．（3） 等比性质：猜想 （ ），与 相等吗？能 否证明你的猜想？（引导学生从上述实例中找出证明方法）等比性质：如果 （ ），那么 ＝ ．思考：等比性质中，为什么要 这个条件？三、 巩固练习：1.在相同时刻的物高与影长成比例，如果一建筑在地面上影长为50米，高为1.5米的测竿的影长为2.5米 ，那么，该建筑的高是多少米？2．若 则 3．若 ，则 四、 本课小结：1．比例的基本性质：a:b=c:d ；2. 合比性质：如果 ，那么 ；3. 等比性质：如果 （ ），五、 布置作业：课本习题4.2
北师大初中数学九年级上册反比例函数1教案
解：（1）根据题意，可得y＝100025x，化简得y＝40x；（2）根据题设可知自变量x的取值范围为0＜x＜85.方法总结：反比例函数的自变量取值范围是全体非零实数，但在解决实际问题的过程中，自变量的取值范围要根据实际情况来确定.解题过程中应该注意对题意的正确理解.三、板书设计反比例函数概念：一般地，如果两个变量x，y之间 的对应关系可以表示成y＝kx（k 为常数，k≠0）的形式，那么称y 是x的反比例函数，反比例函数 的自变量x不能为0确定表达式：待定系数法建立反比例函数的模型结合实例引导学生了解所讨论的函数的表达形式，形成反比例函数概念的具体形象，从感性认识到理性认识的转化过程，发展学生的思维.利用多媒体创设大量生活情境，让学生体验数学来源于生活实际，并为生活实际服务，让学生感受数学有用，从而培养学生学习数学的兴趣.