2. 您能看到, 我頭發(fā)太長了。You can see that my hair is much too long.3. 無論什么時候, 只要您想回來就回來。Please come back whenever you want.4. 您僅有很少的頭發(fā)要理! You only have too little hair to cut !5. 為您服務(wù)是我的榮幸!It is my honour to serve you!Step 9 Writing(Henry is walking down the street when he sees a sign for a place that cuts hair. He decides to have it cut. )H=Henry B=BarberH: Good afternoon, I’d like to have my hair cut, if I may. (The barber looks at Henry’s hair and continues cutting another man’s hair. ) Er, I’d really like a haircut. As you can see it’s much too long. B: (in a rude manner) Yes, I can see that. Indeed, I can. H: Fine, well, I’ll have a seat then. (He sits in one of the barber’s chairs. The barber turns to look at Henry. )B: It’s quite expensive here, you know! Are you sure you can afford it?H: Yes. I think so. (After his hair is cut, the barber tells Henry how much he must pay. Henry shows the barber the bank note. )B: Why Mr. . . (looks shocked)H: Adams. Henry Adams. I’m sorry. I don’t have any change. B: Please don’t worry! (wearing a big smile) Nothing to worry about! Nothing at all! Please come back whenever you want, even if you only have too little hair to cut! It will be my honour to serve you!Step 10 Pair workExchange drafts with a partner. Use this checklist to help your partner revise his/her draft.1. Are all the elements of a play included and in good order ?2. Do the character use suitable language ?3. Are the stage directions clear and useful ?4. Is the plot clear and exciting enough ?
The theme of this section is “Talk about festival activities and festival experiences”.Festival and holiday is a relaxing and interesting topic for students. This part talks about the topic from the daily life of students’. In the part A ---Listening and Speaking, there are three conversations among different speakers from three countries(Japan, Rio and China), where the speakers are participating in or going to participate in the festivals and celebrations. So listening for the relationship among them is a fundamental task. Actually, with the globalization and more international communication, it is normal for Chinese or foreigners to witness different festivals and celebrations in or out of China. In the Conversation 1, a foreign reporter is interviewing a Japanese young girl who just had participated in the ceremony of the Coming-of-Age Day on the street and asking her feeling about the ceremony and the afterwards activities. Conversation 2, Chinese girl Li Mei is witnessing the Rio Carnival for the first time, and her friend Carla gives her some advice on the costumes which enables her to match with the carnival to have a good time. Conversation 3, a Chinese guide is showing a group of foreign visitors around the Lantern Festival and introducing the customs of the festival to them. The three conversations have a strong vitality and insert the festival and cultural elements from different countries. So perceiving the festivals and cultures from different countries is the second task. At the same time, the scripts also insert the targeted grammar --- v-ing as attributive and predicative, which students can perceive and experience in a real context and make a road for the further study. That is the third task. In the Part B--- Listening and Talking, the theme is “Talk about festival experience”, which is the common topic in our daily conversations. During the conversation, Song Lin, a Chinese student, asked Canadian friend Max about how to spend Christmas. In the conversation, Song Lin talked about experience and the feelings during the Chinese Spring Festival, during which there are not only some enjoyable things but some unpleasant things. After the listening, perhaps students find there are some similarities between Christmas and the Chinese Spring Festival as there are some differences in the origins and celebrations. For example, people always visit friends and relatives, decorate their houses, have a big dinner together, chat and give presents to each other.
Step 4 PracticeRead the conversation. Find out which words have been left out.Justin: Linlin, I’m going to Guizhou Province next month. I’m super excited! Any recommendations for places to visit?Linlin: Wow, cool! Guizhou is a province with a lot of cultural diversity. Places to visit...well, definitely the Huangguoshu Waterfall first.Justin: What’s special about the waterfall?Linlin: Well, have you ever heard of the Chinese novel Journey to the West ?Justin: Yes, I have. Why ?Linlin: In the back of the waterfall, you will find a cave, which is the home of the Monkey King.Justin: Really? Cool! I’ll definitely check it out.Linlin:And I strongly recommend the ethnic minority villages. You’ll find Chinese culture is much more diverse than you thought.Justin:Sounds great, thanks.Answers:Justin: Linlin, I’m going to Guizhou Province next month. I’m super excited! Do you have any recommendations for places to visit?Linlin: Wow, that’s cool! Guizhou is a province with a lot of cultural diversity. What are some places to visit in Guizhou ? Well, definitely the Huangguoshu Waterfall is the first place to visit in Guizhou Province.Justin: What’s special about the waterfall?Linlin: Well, have you ever heard of the Chinese novel Journey to the West ?Justin: Yes, I have heard of the Chinese novel Journey to the West . Why do you ask if I have heard of the Chinese novel Journey to the West?Linlin: In the back of the waterfall, you will find a cave, which is the home of the Monkey King from Journey to the West.Justin: That’s really true? It’s Cool! I’ll definitely check it out.Linlin:And I strongly recommend the ethnic minority villages on your trip to Guizhou Province. You’ll find Chinese culture is much more diverse than you thought it was.Justin:This all sounds great, thanks.
The topic of this part is “Describe a place with distinctive cultural identity”.This section focuses on Chinese culture by introducing Chinatown, whose purpose is to show the relationship between the Chinese culture and American culture. The Chinese culture in Chinatown is an important part of American culture. Chinatown is an important window of spreading Chinese culture and the spirit homeland of oversea Chinese, where foreigners can experience Chinese culture by themselves.Concretely, the title is “Welcome to Chinatown!”, from which we can know that the article aims at introducing Chinatown. The author used the “Introduction--Body Paragraph--Conclusion” to describe the people, language, architecture, business, famous food and drinks and people’s activities, which can be a centre for Chinese culture and shows its unique charm.1. Read quickly to get main idea; read carefully to get the detailed information.2. Learn the characteristics of writing and language.3. Learn to introduce your own town according to the text.4. Learn to correct others’ writing.1. Learn the characteristics of writing and language.2. Learn to introduce your own town according to the text.Step 1 Lead in ---Small talkIn the reading part, we mentioned the Chinatown of San Francisco. How much do you know about Chinatown of San Francisco ?Chinatown is a main living place for Chinese immigrants, where you can see many Chinese-style buildings, costumes, operas, restaurants, music and even hear Chinese.Step 2 Before reading ---Predict the contentWhat is the writer’s purpose of writing this text ? How do you know ?From the title(Welcome to Chinatown) and some key words from the text(tourist, visit, visitors, experience), we can know the purpose of the text is to introduce Chinatown and show the relationship between Chinese culture and American culture.
Step 3 Meaning1. 過去將來時表示從過去某一時間來看將要發(fā)生的動作或存在的狀態(tài), 常用在賓語從句中。一般由“would/should +動詞原形”構(gòu)成。She hoped that they would meet again someday. 她希望將來有一天他們能再見面。2. was/were going to+動詞原形: 表示過去將要發(fā)生或很有可能發(fā)生的動作, 常用于口語中, 表示預(yù)言、意圖或者打算等。He was going to start work the following week. 他打算下星期開始工作。3. was/were about to do: 常用來表示即將發(fā)生的動作, “剛要/正要做……”。注意該結(jié)構(gòu)不與任何時間狀語連用。I felt that something terrible was about to happen. 我感到某種可怕的事情即將發(fā)生。4.was/were to do: 表示“曾計劃做某事”, 如果表示“本來計劃做某事, 動作沒實現(xiàn)”, 則需用 “was/were to have done”。She said she was to have told me about the accident. 她說她本來想告訴我關(guān)于事故的事。5.Start, go, come, leave, see, meet等動詞的過去進行時: 表示就過去某一時刻而言即將發(fā)生的動作。She was coming later. 她隨后就來。I had just put on my overcoat and was leaving to visit a friend of mine. 我剛穿上外套要去看我的一個朋友。
4. A:We’d like to have someone to say a word at the beginning to welcome the group.B:↙Who?A:We thought that you or Dr.Johnson might do it.B用降調(diào)說Who,其意思是問,對方想讓誰在開場時致歡迎詞。Step 6 Pronunciation---Practice1. Listen to the short conversation and mark the intonation with ↗, ↙ or ↙, ↗. Then discuss with a partner what they intend to convey by using different intonation.Owner: You know what ?↗ It’s a million-pound bank note↙.Waiter 1: Really ?↗(question)Waiter 2: Really !↙(unbelievable and surprised)Waiter 3: Really ?!↙↗(first question then surprised)2. Listen to the conversations. Underline the parts that are stressed and mark the intonation. Then talk about the implied meanings of the responses with different intonations. Listen again and repeat.1) Henry: It’s a nice suit.Owner: Oh, it’s perfect!↙(The intonation means it is very suitable for Henry.)2) Henry: Well, that’s very kind of you.Owner: Kind, sir ?↗(what you said is not right) No, it’s kind of you. You must come whenever you want and have whatever you like. Just having you sit here is a great honour !!↙(welcome you to come again)3)Henry:Well, to be honest, I have none. Oliver:(happily) What luck!(excited) Brother↗, what luck!↙(It means “Didn’t you hear it?”)Henry: Well, it may seem lucky to you but not to me!↗(angry) If this is your idea of some kind of joke, I don’t think it’s very funny. Now if you’ll excuse me, I ought to be on my way.↙(If so, I would leave.)Roderick: Please don’t go↙...(hope Henry can wait for a moment)Part B Viewing and Talking---Describe people’s changing attitudes in a film clipStep 1 Before-listening---Tell the filmYou are going to watch part of the film The Million Pound Bank Note. Look at these photos and guess what happens in the film.
1、有利于維護國家的統(tǒng)一和安全民族區(qū)域自治以領(lǐng)土完整、國家統(tǒng)一為前提和基礎(chǔ),是國家集中統(tǒng)一領(lǐng)導(dǎo)與民族區(qū)域自治的有機結(jié)合。增強了中華民族的凝聚力,使各族人民特別是少數(shù)民族人民把熱愛民族與熱愛祖國的感情結(jié)合起來,自覺擔負起捍衛(wèi)祖國統(tǒng)一、保衛(wèi)邊疆的光榮職責。2、有利于保障少數(shù)民族人民當家作主的權(quán)利民族自治地方充分享有自治權(quán)利。自主管理本地內(nèi)部事務(wù),滿足了少數(shù)民族人民積極參加國家政治生活的愿望。3、有利于發(fā)展平等、團結(jié)、互助的社會主義新型民族關(guān)系民族自治地方以一個或幾個少數(shù)民族為主體,同時包括當?shù)鼐幼〉臐h族和其他少數(shù)民族,各族人民和各族干部之間聯(lián)系更加密切,逐步消除了歷史上遺留下來的民族隔閡。4、有利于促進社會主義現(xiàn)代化事業(yè)的發(fā)展自治機關(guān)能夠結(jié)合本民族、本地區(qū)特點,把少數(shù)民族的特殊利益與國家的整體利益協(xié)調(diào)起來,充分發(fā)揮各自的特長和優(yōu)勢,調(diào)動各族人民參加國家建設(shè)的積極性、創(chuàng)造性。
教 學 過 程教師 行為學生 行為教學 意圖 *揭示課題 8.3 兩條直線的位置關(guān)系(二) *創(chuàng)設(shè)情境 興趣導(dǎo)入 【問題】 平面內(nèi)兩條既不重合又不平行的直線肯定相交.如何求交點的坐標呢? 圖8-12 介紹 質(zhì)疑 引導(dǎo) 分析 了解 思考 啟發(fā) 學生思考 *動腦思考 探索新知 如圖8-12所示,兩條相交直線的交點,既在上,又在上.所以的坐標是兩條直線的方程的公共解.因此解兩條直線的方程所組成的方程組,就可以得到兩條直線交點的坐標. 觀察圖8-13,直線、相交于點P,如果不研究終邊相同的角,共形成四個正角,分別為、、、,其中與,與為對頂角,而且. 圖8-13 我們把兩條直線相交所成的最小正角叫做這兩條直線的夾角,記作. 規(guī)定,當兩條直線平行或重合時,兩條直線的夾角為零角,因此,兩條直線夾角的取值范圍為. 顯然,在圖8-13中,(或)是直線、的夾角,即. 當直線與直線的夾角為直角時稱直線與直線垂直,記做.觀察圖8-14,顯然,平行于軸的直線與平行于軸的直線垂直,即斜率為零的直線與斜率不存在的直線垂直. 圖8-14 講解 說明 講解 說明 引領(lǐng) 分析 仔細 分析 講解 關(guān)鍵 詞語 思考 思考 理解 思考 理解 記憶 帶領(lǐng) 學生 分析 帶領(lǐng) 學生 分析 引導(dǎo) 式啟 發(fā)學 生得 出結(jié) 果
一、教材分析普通高中思想政治課程標準及浙江省普通高中新課程實驗學科教學指導(dǎo)意見對本課時內(nèi)容做了如下規(guī)定:基本要求:知道我國是統(tǒng)一的多民族國家;理解我國處理民族關(guān)系的三項基本原則及其相互關(guān)系;懂得處理民族關(guān)系的重要性,自覺履行維護國家統(tǒng)一和民族團結(jié)的義務(wù)。發(fā)展要求:聯(lián)系國內(nèi)外的具體事例,加深理解我國處理民族關(guān)系的基本原則的重要性。本框題有如下內(nèi)容不作拓展:我們偉大的祖國是各族人民共同締造的;我國新型民族關(guān)系的形成;實施西部大開發(fā)戰(zhàn)略對加快民族自治地方的經(jīng)濟和社會發(fā)展的意義;我國能夠真正建立新型民族的原因?!短幚砻褡尻P(guān)系的原則:平等、團結(jié)、共同繁榮》是高一《政治生活》第三單元第七課內(nèi)容,本課內(nèi)容由三目構(gòu)成,第一目:雪域高原的歷史性跨越,第二目:我國處理民族關(guān)系的基本原則,第三目:鞏固社會主義民族關(guān)系,我們該做什么,能做什么。
環(huán)境問題 是伴著人口問題、資源問題和發(fā)展問題產(chǎn)生。本質(zhì)是發(fā)展問題 ,可持續(xù)發(fā)展。6分析可持續(xù)發(fā)展的概念、內(nèi)涵和 原則?可持續(xù)發(fā)展的含義:可持續(xù)發(fā)展是這樣的發(fā)展,它既滿足當代人的需求,而又不損害后代人滿足其需求的能力??沙掷m(xù)發(fā)展的內(nèi)涵:生態(tài)持續(xù)發(fā)展 ,發(fā)展的基礎(chǔ);經(jīng)濟持續(xù)發(fā)展,發(fā)展條件;社會持續(xù)發(fā)展,發(fā)展目的??沙掷m(xù)發(fā)展的原則:公平性原則——代內(nèi)、代際、人與物、國家與地區(qū)之間;持續(xù)性原則——經(jīng)濟活動保持在資源環(huán)境承載力之內(nèi);共同性原則— —地球是一個整體?!究偨Y(jié)新課】可持續(xù)發(fā) 展的含義:可持續(xù)發(fā)展是這樣的發(fā)展,它既滿足當代人的需求,而又不損害后代人滿足其需求的能力。可持續(xù)發(fā)展的內(nèi)涵:生態(tài)持續(xù)發(fā)展,發(fā)展的基礎(chǔ);經(jīng)濟持續(xù)發(fā)展,發(fā)展條件;社會持續(xù)發(fā)展,發(fā)展目的。
環(huán)節(jié)四 情感升華,感悟生活播放《愛我中華》,感受祖國的偉大,民族的團結(jié)。設(shè)計意圖:使學生感受偉大的中華民族的精神,內(nèi)心產(chǎn)生共鳴,抒發(fā)強烈的愛國熱情。教師帶領(lǐng)學生一起合唱,用歌聲結(jié)束本堂課內(nèi)容,能再次喚起學生的愛國情感,使學生認識到:維護國家統(tǒng)一和民族團結(jié)是每個公民的義務(wù)。環(huán)節(jié)五 課堂小結(jié) 鞏固知識本節(jié)課我采用線索性的板書,整個知識結(jié)構(gòu)一目了然,為了充分發(fā)揮學生在課堂的主體地位,我將課堂小結(jié)交由學生完成,請學生根據(jù)課堂學習的內(nèi)容,結(jié)合我的板書設(shè)計來進行小結(jié),以此來幫助教師在第一時間掌握學生學習信息的反饋,同時培養(yǎng)學生歸納分析能力、概括能力。本節(jié)課,我根據(jù)建構(gòu)主義理論,強調(diào)學生是學習的中心,學生是知識意義的主動建構(gòu)者,是信息加工的主體,要強調(diào)學生在課堂中的參與性、以及探究性,不僅讓他們懂得知識,更讓他們相信知識,并且將知識融入到實踐當中去,最終達到知、情、意、行的統(tǒng)一。
一、設(shè)計思想通過本節(jié)教學,不但要使學生認識掌握勻變速直線運動的規(guī)律,而且要通過對這問題的研究,使學生了解和體會物理學研究問題的一個方法,圖象、公式、以及處理實驗數(shù)據(jù)的方法等。這一點可能對學生更為重要,要通過學習過程使學生有所體會。本節(jié)在內(nèi)容的安排順序上,既注意了科學系統(tǒng),又注意學生的認識規(guī)律。講解問題從實際出發(fā),盡量用上一節(jié)的實驗測量數(shù)據(jù)。運用圖象這種數(shù)學工具,相對強調(diào)了圖象的作用和要求。這是與以前教材不同的。在現(xiàn)代生產(chǎn)、生活中,圖象的運用隨處可見,無論學生將來從事何種工作,掌握最基本的應(yīng)用圖象的知識,都是必須的。學生在初學時往往將數(shù)學和物理分割開來,不習慣或不會將已學過的數(shù)學工具用于物理當中。在教學中應(yīng)多在這方面引導(dǎo)學生。本節(jié)就是一個較好的機會,將圖象及其物理意義聯(lián)系起來。
一、設(shè)計思想通過本節(jié)教學,不但要使學生認識掌握勻變速直線運動的規(guī)律,而且要通過對這問題的研究,使學生了解和體會物理學研究問題的一個方法,圖象、公式、以及處理實驗數(shù)據(jù)的方法等。這一點可能對學生更為重要,要通過學習過程使學生有所體會。本節(jié)在內(nèi)容的安排順序上,既注意了科學系統(tǒng),又注意學生的認識規(guī)律。講解問題從實際出發(fā),盡量用上一節(jié)的實驗測量數(shù)據(jù)。運用圖象這種數(shù)學工具,相對強調(diào)了圖象的作用和要求。這是與以前教材不同的。在現(xiàn)代生產(chǎn)、生活中,圖象的運用隨處可見,無論學生將來從事何種工作,掌握最基本的應(yīng)用圖象的知識,都是必須的。學生在初學時往往將數(shù)學和物理分割開來,不習慣或不會將已學過的數(shù)學工具用于物理當中。在教學中應(yīng)多在這方面引導(dǎo)學生。本節(jié)就是一個較好的機會,將圖象及其物理意義聯(lián)系起來。
一、教學目標1.知識與技能:(1)知道勻速直線運動的位移x=υt對應(yīng)著 圖象中的矩形面積.(2)掌握勻變速直線運動的位移與時間關(guān)系的公式 ,及其簡單應(yīng)用.(3)掌握勻變速直線運動的位移與速度關(guān)系的公式 ,及其簡單應(yīng)用.2.過程與方法:(1)讓學生初步了解探究學習的方法.(2)培養(yǎng)學生運用數(shù)學知識-----函數(shù)圖象的能力.(3)培養(yǎng)學生運用已知結(jié)論正確類比推理的能力.3.情感態(tài)度與價值觀:(1)培養(yǎng)學生認真嚴謹?shù)目茖W分析問題的品質(zhì).(2)從知識是相互關(guān)聯(lián)、相互補充的思想中,培養(yǎng)學生建立事物是相互聯(lián)系的唯物主義觀點.(3)培養(yǎng)學生應(yīng)用物理知識解決實際問題的能力.二、教學重點、難點1.教學重點及其教學策略:重點:(1)勻變速直線運動的位移與時間關(guān)系的公式 及其應(yīng)用.(2)勻變速直線運動的位移與速度關(guān)系的公式 及其應(yīng)用.教學策略:通過思考討論和實例分析來加深理解.
一、教學目標1.知識與技能:(1)知道勻速直線運動的位移x=υt對應(yīng)著 圖象中的矩形面積.(2)掌握勻變速直線運動的位移與時間關(guān)系的公式 ,及其簡單應(yīng)用.(3)掌握勻變速直線運動的位移與速度關(guān)系的公式 ,及其簡單應(yīng)用.2.過程與方法:(1)讓學生初步了解探究學習的方法.(2)培養(yǎng)學生運用數(shù)學知識-----函數(shù)圖象的能力.(3)培養(yǎng)學生運用已知結(jié)論正確類比推理的能力.3.情感態(tài)度與價值觀:(1)培養(yǎng)學生認真嚴謹?shù)目茖W分析問題的品質(zhì).(2)從知識是相互關(guān)聯(lián)、相互補充的思想中,培養(yǎng)學生建立事物是相互聯(lián)系的唯物主義觀點.(3)培養(yǎng)學生應(yīng)用物理知識解決實際問題的能力.二、教學重點、難點1.教學重點及其教學策略:重點:(1)勻變速直線運動的位移與時間關(guān)系的公式 及其應(yīng)用.(2)勻變速直線運動的位移與速度關(guān)系的公式 及其應(yīng)用.教學策略:通過思考討論和實例分析來加深理解.
一、課前準備師:同學們想一想,你同父母一起去商店買衣服時,衣服上的號碼都有哪些,標志是什么?學生:我看到有些衣服上標有M、S、L、XL、XXL等號碼.但我不清楚代表的具體范圍,適合什么人穿,但肯定與身高、胖瘦有關(guān).師:這位同學很善動腦,也愛觀察.S代表最小號,身高在150~155cm的人適合穿S號.M號適合身高在155~160cm的人著裝……廠家做衣服訂尺寸也并不是按所有人的尺寸定做,而是按某個范圍分組批量生產(chǎn).你覺得這種生產(chǎn)方法有什么優(yōu)點?學校要為同學們訂制校服,為此小明調(diào)查了他們班50名同學的身高,結(jié)果(單位cm).如下
3、一般地,對于關(guān)于 方程 為已知常數(shù), ,試用求根公式求出它的兩個解x1、x2,算一算x1+x2、x1?x2的值,你能得出什么結(jié)果?與上面發(fā)現(xiàn)的現(xiàn)象是否一致?!局R應(yīng)用】 1、(1)不解方程,求方程兩根的和兩根的積:① ② (2)已知方程 的一個根是2,求它的另一個根及 的值。(3)不解方程,求一 元二次方程 兩個根的①平方和;②倒數(shù)和。(4)求一元二次方程,使它的兩個根是 ?!練w納小結(jié)】【作業(yè)】1、已知方程 的一個根是1,求它的另一個根及 的值。2、設(shè) 是方程 的兩個根,不解方程,求下列各式的值。① ;② 3、求一個一元次方程,使它的兩 個根分別為:① ;② 4、下列方程兩根的和與兩根的積各是多少 ?① ; ② ; ③ ; ④ ;
2、猜想 一元二次方程的兩個根 的和與積和原來的方程有什么聯(lián)系?小組交流。3、一般地,對于關(guān)于 方程 為已知常數(shù), ,試用求根公式求出它的兩個解x1、x2,算一算x1+x2、x1?x2的值,你能得出什么結(jié)果?與上面發(fā)現(xiàn)的現(xiàn)象是否一致?!局R應(yīng)用】 1、(1)不解方程,求方程兩根的和兩根的積:① ② (2)已知方程 的一個根是2,求它的另一個根及 的值。(3)不解方程,求一 元二次方程 兩個根的①平方和;②倒數(shù)和。(4)求一元二次方程,使它的兩個根是 ?!練w納小結(jié)】【作業(yè)】1、已知方程 的一個根是1,求它的另一個根及 的值。2、設(shè) 是方程 的兩個根,不解方程,求下列各式的值。① ;② 3、求一個一元次方程,使它的兩 個根分別為:① ;② 4、下列方程兩根的和與兩根的積各是多少 ?① ; ② ; ③ ; ④ ;
提問:1.怎樣判斷兩種相關(guān)聯(lián)的量是否成正比例?用字母怎樣表示正比例關(guān)系? 2.判斷下面兩種量是否成正比例?為什么? (1)時間一定,行駛的路程和速度 (2)除數(shù)一定,被除數(shù)和商 3.單價、數(shù)量和總價之間有怎樣的關(guān)系?在什么條件下,兩種量成正比例? 4.導(dǎo)入新課: 如果總價一定,單價和數(shù)量的變化有什么規(guī)律?這兩種量存在什么關(guān)系?今天,我們就來研究這種變化規(guī)律。
四個同學為一個合作小組;每個小組利用教師為其準備的各類三角形,作出它們的高.比一比,看哪一個小組做得最快,發(fā)現(xiàn)的結(jié)論多. 師生行為:學生操作、討論,教師巡視、指導(dǎo),使學生理解【設(shè)計意圖】通過讓學生操作、觀察、推理、交流等活動,來培養(yǎng)學生的動手、動腦能力,發(fā)展其空間觀察.活動結(jié)論:1.銳角三角形的三條高都在三角形內(nèi); 2.直角三角形的一條高在三角形內(nèi)(即斜邊上的高),而另兩條高恰是它的兩條直角邊; 3.鈍角三角形的一條高在三角形內(nèi),而另兩條高在三角形外.(這是難點,需多加說明) 總之:任何三角形都有三條高,且三條高所在的直線相交于一點.(我們把這一點叫垂心)課堂小結(jié) 1.三角形中三條重要線段:三角形的高、中線和角平分線的概念. 2.學會畫三角形的高、中線和角平分線.