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必修二第四单元 1 老师用

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高中英语 必修二 Unit 4 Wildlife protection 1 仁爱之心对学生 敬畏之心做教育 1 知识梳理 1. protection n.(1)[U]保护，防御； You’d better turn to an adult for protection. 你最好向成年人寻求保护。 (2)[C]保护者，防护物 Shoes are the protections for the feet. 鞋子是用来保护脚的。 [短语拓展] ①under the protection of 在...的保护下 ②afford/give/provide protection 提供保护 ③receive protecton 受到保护 ④a protection against/from 防御....的保护物 [思维拓展] protect 是及物动词，意为“保护”。 ①protect sb./sth. from + n. 保护.....免受...... ②protect sb./oneself from + doing 保护某人免受...... ③protect A against B 保护A免遭B的危害 2.die out (动、植物物种）灭绝；（风俗、习惯等）逐渐消失，消灭；（火）逐渐熄灭。 [短语拓展] ①die away (声音、光线、风等）逐渐平息、渐弱 ②die off (家庭、种族等）相继死亡，（草木）先后枯死 ③die down (火、兴奋等）渐弱，渐息 ④be dying for 很想要，渴望 ⑤be dying to do 很想做，渴望做 ⑥die of 因....而死 ⑦die from 因....而死，死于 ⑧die a ...death 以....方式死亡（death前可用形容词） Many animals have died out over the past years. 在过去几年间，许多动物灭绝了。 That custom died out years ago. 那种风俗许多年前消失了。 The Red Indian tribes have now almost died out. 印第安人部落现在几乎灭绝了。 3.progress n.(1)[U]进步，进展 You have made great progress in your spoken English. 你的英语口语已经有了很大进步。 n.(2)[U]前进，行进 The ship made slow progress through the rough sea. 轮船在汹涌的大海上缓慢前进。 [思维拓展] progress 可用作不及物动词，意为“进步，提高；前进，行进。” 高中英语 必修二 Unit 4 Wildlife protection 1 仁爱之心对学生 敬畏之心做教育 2 4.decrease (1)vt.&vi.(使）变小，减少 The workers wanted to decrease the number of working hours and to increase pay. 工人们想要减少工作时间并增加工资。 (2)n.减少 There has been a steady decrease in population in this city. 这个城市的人口在不断减少。 [常用搭配] on the decrease 在减少 a decrease in sth. 某事物的减少 [搭配拓展] decrease from 在....基础上减少 decrease in 在...方面减少 decrease to 减至.....；减少到 decrease by 减少了..... 5.loss (lose v.) n.(1)[U] 遗失，丧失 Did you report the loss of your jewellery to the police? 你有没有把你丢失珠宝的事报告警方？ (2)损失，损坏 The company suffered a heavy loss as a result of that mistake. 因为那次错误，公司损失惨重。 (3)[C]输，未能赢 What made him unhappy was the loss of yesterday’s football match. 昨天比赛输了使他不高兴。 [思维拓展] the loss of sth. 损失/丢失/损害/输掉........ lose oneself 迷路，迷失方向；沉湎于 suffer a loss(of) 蒙受损失 lose one’s balance 失去平衡 make up a loss 弥补损失 lose a game /match by （以...之差）输掉比赛 a loss in weight 重量减少，体重减轻 be lost in 沉迷于，埋首 at a loss 亏损；不知所措；困惑 be lost to sb. 已不是某人的 lose one’s way 迷路

典题精练 单选： 1.( 1 ) He is wearing sunglasses to _____his eyes from the strong sunlight.(WHX) A. hold B.stop C.protect D.prevent (2) Strong social supports from your families, friends or coworkers provide people with_____ illnesses. A.stop from B.prevention C.protection against D. protect against (3)Flowers in our garden are well protected ________the weather. A.on B.to C.against D.with 2.(1) Now some creatures are in danger of ________. A. dying out B. dying off C. dying of D. dying from 高中英语 必修二 Unit 4 Wildlife protection 1 仁爱之心对学生 敬畏之心做教育 3 (2)Although the wind has _______,the rain remains steady, so you still need a raincoat.(WHX) A.turned up B. gone back C. died down D. blown out 3.(1) No______has been made in the talks on the withdrawal of foreign troops from the country. A. success B. progress C. advance D. result 4.( 1 ) With the production_______year by year, the manager had to resign. A. deceased B. decreasing C. increased D. increasing 5.( 1 ) For a moment Arthur was _______how to reply to the question. A. have no idea B. not known C. puzzling D. at a loss (2) The villagers all went out to look for the __________child. A. losing B. missing C. gone D. unseen (3)I’m totally at a ________as to what is going on here. A. loose B. lose C. lost D. Loss (4)He was at a _______what to say to the teacher’s question-----obviously he was_______in thought just now.(WHX) A.loss;losing B.loss;lost C.losing;lost D.lost;loss

能力提升 阅读（WHX) He may be still young, but he may surprise you! If you ask around, many would say that the music world has a new leader----the real king is Jay Chou. As a child, Jay Chou ws never too good at his subjects, and when he didn’t get into any college, a lot of people said that he won’t be very never did. “I knew I still had music to depend on. For everything else, I always believe in myself, but it is for my musical talent that I’m so sure of myself,” he said. Growing up in a single-parent family, Jay lived a lonely childhood. Without many friends, he had a habit of day-dreaming, dreaming into his world of music. So how did Jay get into music? At the age of three, he started learning to play the piano. His mother was very strict to make sure he practiced hard. Later, he learned to play the cello(大提琴). With all the musical talent, it isn’t surprising that Jay started out as a song writer. Since the age of sixteen, he has been writing songs for many of the most popular Asian singers, including Coco Lee , Jacky Wu, etc. It was only in 2000 that Jay put out his own album”Jay”. Jay’s soft and smooth voice is especially gentle and calm, making this first album an immediate hit. Each song in the album has its own, different style, and skillfully, Jay used his voice to suit each song’s character. Lyrics of Jay’s songs all have a special touch. In his song “Dad, I am Back.”, the subject is a broken family. “I heard that after war, there is peace.Why do I always see my dad beating my mom? Since I was young, you told me to learn from you, use you as a model. So much pretense. How do you expect me to be like you!” (WHX)

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政治必修二第四单元知识点总结

政治必修二第四单元知识点总结

政治必修二第四单元知识点总结
国际关系的决定因素：国家利益是国际关系的决定因素，国家间的共同利益是国家合作的基础，而利益的对立则是引起国家冲突的根源。

国际关系的实质是一种利益关系，维护国家利益是主权国家对外活动的出发点和落脚点。

和平与发展的时代主题：和平与发展是当今时代的主题。

求和平、谋发展、促合作已经成为不可阻挡的时代潮流。

维护世界和平、促进共同发展是我国外交政策的宗旨。

中国坚持独立自主的和平外交政策，始终不渝走和平发展道路，始终不渝奉行互利共赢的开放战略。

世界多极化在曲折中发展：世界正在形成若干个政治经济力量中心。

广大发展中国家是反对霸权主义和强权政治、促进世界和平与发展的重要力量，是推动建立公正、合理的国际政治经济新秩序的主力军。

世界多极化有利于抑制霸权主义和强权政治，有利于建立国际政治经济新秩序，推动世界的和平与发展。

我国独立自主的和平外交政策：我国外交政策的宗旨是维护世界和平、促进共同发展。

我国外交政策的基本目标是维护我国的独立和主权，促进世界的和平与发展。

我国外交政策的立场是独立自主。

和平共处五项原则是我国对外关系的基本准则。

这些知识点构成了政治必修二第四单元的主要内容，涵盖了国际关系的基本理论、时代主题、世界多极化趋势以及我国的外交政策等方面。

对于理解和掌握国际政治经济现象、分析国际关系动态以及认识我国在国际舞台上的角色和作用具有重要意义。

高中数学选择性必修二 4 3 1(第1课时)等比数列的概念及通项公式 教案

高中数学选择性必修二 4 3 1(第1课时)等比数列的概念及通项公式 教案

等比数列的概念及通项公式教学设计
将一张很大的薄纸对折，对折30次后有多厚？
不妨假设这张纸的厚度为0.01毫米。

1 看一看纸的厚度的变化
提示：
折1次折2次折3次折4次 (30)
厚度2 (21)4 (22)8 (23)16 (24) (230)
反之，任给指数函数
f(x)=ka x (k,a为常数，k≠0,
a>0且 a≠1)
则f(1)=ka ,f(2)=ka2,⋯,f(n)=ka n,⋯
构成一个等比数列{ka n}，其首项为ka，公比为a.
等比数列的单调性
由等比数列的通项公式与指数型函数的关系可得等比数列的单调性如下：
（1）当a1>0,q>1或 a1<0,0<q<1时，等比数列{a n}为递增数列；
（2）当a1>0,0<q<1或 a1<0,q>1时，等比数列{a n}为递减数列；
（3）当ｑ＝１时，数列{a n}为常数列；
（4）当ｑ＜０时，数列{a n}为摆动数列.
下面，我们利用通项公式解决等比数列的一些问题.
例1 若等比数列{a n}的第4项和第6项分别为。

北师大版高中英语必修2Unit4教案《1 Tommorrow’s world 教学指导

北师大版高中英语必修2Unit4教案《1 Tommorrow’s world 教学指导

《1 Tommorrow's World》教学指导Objectives■To use the title of a text to predict the content.■To practise using vocabulary of cyberspace.■To practise using will and going to to talk and write about the future.Resource usedGrammar Summary 1. Mini-Grammar 1Possible problemsStudents tend to overuse will to express the future. The Language Power gives practice in the use of will and going to separately as well as contrasting them.Some students may have more knowledge than others of cyberspace, the Internet and e-mail.BackgroundVirtual reality is a development of computer technology in which, through headsets and special gloves and suits equipped with sensors, the user can directly interact with a 3-D computer programme by moving “inside” it. Some of its most popular applications are flight simulators and a variety of arcade games. The tapescript in Lesson 2 gives the history of the web.Routes through the material■If you are short of time, set some of the exercises for homework and omit Exercise 8.■If you have time, do the Options activities.■If you have two periods for this lesson, a suitable natural break is after Exercise 6.Language Power: pages 54?C55.Mini-Grammar: 1.ReadingBefore you startExercise 1■As a clas s, students discuss life in the next twenty years and the effects of technology. Draw students’ attention to the use of will in the question and example answer and encourage them to use similar structures. If you wish, elicit topics and write them on the board to start students thinking, e.g. travel, education, communication, food, personal relationships, work, hobbies, sport, money, government, health, homes, agriculture..Exercise 2■Ask students how useful it is to read the title of a text or a newspaper headline. In pairs, students discuss which topics will be in this text, “The Future of Cyberspace”. Ask students if they would include any other topics if they were writing the article.Read to learnExercise 3■ Students read the text quickly and check their guesses.Exercise 4Key Wordshacker, chaos, terrorists, the Net (Internet), virtual reality,crash■ Students read the text again, finding the Key Words and working out the definitions.■ Check answers by having students read out the se ntences in the text containing the Key Word and then substitute the definition in the sentence.■ Ask students to make sentences of their own using some of the Key Words.■ Students look back at the text and discuss whether they agree with any of the pre dictions made in the text.Language Power: The Word Corner on page 55 gives further practice in computer vocabulary.Exercise 5■ Students discuss the questions in pairs, then open up the discussion to the whole class. Encourage students to use the text as the resource to get the information. Compare what they have listed.Exercise 6■ Students discuss the questions in groups. Encourage students to use the information they have collected from the text and practise the language of expressing opinions, agreeing and disagreeing.GrammarPREDICTIONS will and be going toExercise 7■ Students work in pairs, finding the sentences in the text and discussing the uses of the two forms.Answers1 a2 b3 bRefer students to Grammar Summary 1 for further explanationand examples.■ Ask students to give their opinion about how students will learn in the future (using will), e.g. Where will they learn? What subjects will they study? How will they lear(teachers/books/ computers)? What age will they start/finish school? What will universities be like?■ Ask students to guess what the people are going to do, e.g. 'Peter is going into the bank.' (He's going to get some money.) 'Anna is going into the Sports Centre.' (She's going to play tennis.) Other places ?C restaurant, library, hospital, church, station, post office, park.Exercise 8■ Students do the exercise individually and then compareanswers with their partners.■ When checking answers, ask students to think of a situation in which the alternativ e comment would be better.Answers1 a2 b■ Draw students' attention to the use of expressions such as / think/I hope/I believe that before will to express personal opinion.Exercise 9■ Check students' answers by having them read the text aloud.Answers1 is going to2 are going to3 are going to4 will5 will■ In pairs students make similar pairs of statements beginning: 'We have clear evidence that in the next few years … I think … .'Exercise 10■ Students look at the pictures and write stat ements.Answers1 The cars are going to crash.2 She’s going to have a baby.3 He’s going to walk into the bus stop.4 The house is going to fall into the sea.■ Write prompts on the board. Ask students to think of situations in which the statements w ould be appropriate:It’s going to rain/fall down/break.We’re going to be late/win.He’s going to faint/be angry/be surprised.Language in UseExercise 11■ Students work in pairs, exchanging predictions and taking turns to be an optimist and a pessimist.■ Then, in small groups, students select three or four of the topics (or other topics of their own choice) and discuss them in more depth.■ The groups report back to the class and see if their views are shared by the rest of the class. OptionsPracticeGive students some suggestions of topics to make predictions about, e.g. the future of learning, the future of medicine, the future of the planet.Each student chooses one topic to make predictions about and writes three paragraphs using these expressions from the text to start each paragraph:In the last thirty years, …Some experts …However many people …ExtensionStudents look back at the Key Words (hacker, terrorist) and discuss examples they have heard of or read concerning these activities. Students discuss how these activities can be stopped.。

高中物理选择性必修二 第四章 第一节 电磁振荡

高中物理选择性必修二 第四章 第一节 电磁振荡

√B.电荷量为零时，线圈中振场能
0 反向最大
最大
e T 最多 最大 0 0
3.(1)在LC振荡回路发生电磁振荡的过程中，与电容器有关的物理量：电
荷 量 q 、 电 场 强 度 E 、 电 场 能 EE 是 同 步 变 化 的 ， 即 q↓→E↓→EE↓( 或 q↑→E↑→EE↑). 与振荡线圈有关的物理量：振荡电流i、磁感应强度B、磁场能EB也是同 步变化的，即i↓→B↓→EB↓(或i↑→B↑→EB↑). (2)在LC振荡过程中，电容器上的三个物理量q、E、EE增大时，线圈中 的三个物理量i、B、EB减小，即q、E、EE↑—异—向—变—化→ i、B、EB↓.
(2)电容器充电：电容器放电完毕时，由于线圈的 自感 作用，电流不会立 即减小为零，而是保持原来的方向继续流动，并逐渐减小，电容器反向 充电 ，电流减小到零时，充电结束，极板上的电量达到最大值.该过程 能量由磁场能逐渐转化为 电场能 ，反向充电完毕瞬间，磁场能全部转化 为电场能.
2.电磁振荡的实质 在电磁振荡过程中，回路中的电流i、电容器极板上的电荷量q、电容器 里的电场强度E、线圈里的磁感应强度B，都在 周期性变化 ，电场能和磁 场能相互 转化 .
二、电磁振荡的周期和频率
1.电磁振荡的周期T：电磁振荡完成一次 周期性变化 所用的时间.
2.电磁振荡的频率f：电磁振荡在一段时间内做周期性变化的次数与所用
时间之比.
3.LC振荡电路的周期和频率公式：T＝2π
LC，f＝2π
1 LC.
其中：周期T、频率f、自感系数L、电容C的单位分别是秒(s)、赫兹(Hz)、
针对训练 如图5甲所示，在LC振荡电路中，其电流变化规律如图乙所
示，规定顺时针方向为电流i的正方向，则