本章通過學習用二分法求方程近似解的的方法,使學生體會函數(shù)與方程之間的關系,通過一些函數(shù)模型的實例,讓學生感受建立函數(shù)模型的過程和方法,體會函數(shù)在數(shù)學和其他學科中的廣泛應用,進一步認識到函數(shù)是描述客觀世界變化規(guī)律的基本數(shù)學模型,能初步運用函數(shù)思想解決一些生活中的簡單問題。1.了解函數(shù)的零點、方程的根與圖象交點三者之間的聯(lián)系.2.會借助零點存在性定理判斷函數(shù)的零點所在的大致區(qū)間.3.能借助函數(shù)單調性及圖象判斷零點個數(shù).數(shù)學學科素養(yǎng)1.數(shù)學抽象:函數(shù)零點的概念;2.邏輯推理:借助圖像判斷零點個數(shù);3.數(shù)學運算:求函數(shù)零點或零點所在區(qū)間;4.數(shù)學建模:通過由抽象到具體,由具體到一般的思想總結函數(shù)零點概念.重點:零點的概念,及零點與方程根的聯(lián)系;難點:零點的概念的形成.
本節(jié)內(nèi)容來自人教版高中數(shù)學必修一第一章第一節(jié)集合第二課時的內(nèi)容。集合論是現(xiàn)代數(shù)學的一個重要基礎,是一個具有獨特地位的數(shù)學分支。高中數(shù)學課程是將集合作為一種語言來學習,在這里它是作為刻畫函數(shù)概念的基礎知識和必備工具。本小節(jié)內(nèi)容是在學習了集合的含義、集合的表示方法以及元素與集合的屬于關系的基礎上,進一步學習集合與集合之間的關系,同時也是下一節(jié)學習集合間的基本運算的基礎,因此本小節(jié)起著承上啟下的關鍵作用.通過本節(jié)內(nèi)容的學習,可以進一步幫助學生利用集合語言進行交流的能力,幫助學生養(yǎng)成自主學習、合作交流、歸納總結的學習習慣,培養(yǎng)學生從具體到抽象、從一般到特殊的數(shù)學思維能力,通過Venn圖理解抽象概念,培養(yǎng)學生數(shù)形結合思想。
新知講授(一)——古典概型 對隨機事件發(fā)生可能性大小的度量(數(shù)值)稱為事件的概率。我們將具有以上兩個特征的試驗稱為古典概型試驗,其數(shù)學模型稱為古典概率模型,簡稱古典概型。即具有以下兩個特征:1、有限性:樣本空間的樣本點只有有限個;2、等可能性:每個樣本點發(fā)生的可能性相等。思考一:下面的隨機試驗是不是古典概型?(1)一個班級中有18名男生、22名女生。采用抽簽的方式,從中隨機選擇一名學生,事件A=“抽到男生”(2)拋擲一枚質地均勻的硬幣3次,事件B=“恰好一次正面朝上”(1)班級中共有40名學生,從中選擇一名學生,即樣本點是有限個;因為是隨機選取的,所以選到每個學生的可能性都相等,因此這是一個古典概型。
本節(jié)通過學習用二分法求方程近似解的的方法,使學生體會函數(shù)與方程之間的關系,通過一些函數(shù)模型的實例,讓學生感受建立函數(shù)模型的過程和方法,體會函數(shù)在數(shù)學和其他學科中的廣泛應用,進一步認識到函數(shù)是描述客觀世界變化規(guī)律的基本數(shù)學模型,能初步運用函數(shù)思想解決一些生活中的簡單問題。課程目標1.了解二分法的原理及其適用條件.2.掌握二分法的實施步驟.3.通過用二分法求方程的近似解,使學生體會函數(shù)零點與方程根之間的聯(lián)系,初步形成用函數(shù)觀點處理問題的意識.數(shù)學學科素養(yǎng)1.數(shù)學抽象:二分法的概念;2.邏輯推理:用二分法求函數(shù)零點近似值的步驟;3.數(shù)學運算:求函數(shù)零點近似值;4.數(shù)學建模:通過一些函數(shù)模型的實例,讓學生感受建立函數(shù)模型的過程和方法,體會函數(shù)在數(shù)學和其他學科中的廣泛應用.
《數(shù)學1必修本(A版)》的第五章4.5.2用二分法求方程的近似解.本節(jié)課要求學生根據(jù)具體的函數(shù)圖象能夠借助計算機或信息技術工具計算器用二分法求相應方程的近似解,了解這種方法是求方程近似解的常用方法,從中體會函數(shù)與方程之間的聯(lián)系;它既是本冊書中的重點內(nèi)容,又是對函數(shù)知識的拓展,既體現(xiàn)了函數(shù)在解方程中的重要應用,同時又為高中數(shù)學中函數(shù)與方程思想、數(shù)形結合思想、二分法的算法思想打下了基礎,因此決定了它的重要地位.發(fā)展學生數(shù)學直觀、數(shù)學抽象、邏輯推理和數(shù)學建模的核心素養(yǎng)。課程目標 學科素養(yǎng)1.通過具體實例理解二分法的概念及其使用條件.2.了解二分法是求方程近似解的常用方法,能借助計算器用二分法求方程的近似解.3.會用二分法求一個函數(shù)在給定區(qū)間內(nèi)的零點,從而求得方程的近似解. a.數(shù)學抽象:二分法的概念;b.邏輯推理:運用二分法求近似解的原理;
本節(jié)課是三角函數(shù)的繼續(xù),三角函數(shù)包含正弦函數(shù)、余弦函數(shù)、正切函數(shù).而本課內(nèi)容是正切函數(shù)的性質與圖像.首先根據(jù)單位圓中正切函數(shù)的定義探究其圖像,然后通過圖像研究正切函數(shù)的性質. 課程目標1、掌握利用單位圓中正切函數(shù)定義得到圖象的方法;2、能夠利用正切函數(shù)圖象準確歸納其性質并能簡單地應用.數(shù)學學科素養(yǎng)1.數(shù)學抽象:借助單位圓理解正切函數(shù)的圖像; 2.邏輯推理: 求正切函數(shù)的單調區(qū)間;3.數(shù)學運算:利用性質求周期、比較大小及判斷奇偶性.4.直觀想象:正切函數(shù)的圖像; 5.數(shù)學建模:讓學生借助數(shù)形結合的思想,通過圖像探究正切函數(shù)的性質. 重點:能夠利用正切函數(shù)圖象準確歸納其性質并能簡單地應用; 難點:掌握利用單位圓中正切函數(shù)定義得到其圖象.
指數(shù)函數(shù)與冪函數(shù)是相通的,本節(jié)在已經(jīng)學習冪函數(shù)的基礎上通過實例總結歸納指數(shù)函數(shù)的概念,通過函數(shù)的三個特征解決一些與函數(shù)概念有關的問題.課程目標1、通過實際問題了解指數(shù)函數(shù)的實際背景;2、理解指數(shù)函數(shù)的概念和意義.數(shù)學學科素養(yǎng)1.數(shù)學抽象:指數(shù)函數(shù)的概念;2.邏輯推理:用待定系數(shù)法求函數(shù)解析式及解析值;3.數(shù)學運算:利用指數(shù)函數(shù)的概念求參數(shù);4.數(shù)學建模:通過由抽象到具體,由具體到一般的思想總結指數(shù)函數(shù)概念.重點:理解指數(shù)函數(shù)的概念和意義;難點:理解指數(shù)函數(shù)的概念.教學方法:以學生為主體,采用誘思探究式教學,精講多練。教學工具:多媒體。一、 情景導入在本章的開頭,問題(1)中時間 與GDP值中的 ,請問這兩個函數(shù)有什么共同特征.要求:讓學生自由發(fā)言,教師不做判斷。而是引導學生進一步觀察.研探.
問題導入:問題一:試驗1:分別拋擲兩枚質地均勻的硬幣,A=“第一枚硬幣正面朝上”,B=“第二枚硬幣正面朝上”。事件A的發(fā)生是否影響事件B的概率?因為兩枚硬幣分別拋擲,第一枚硬幣的拋擲結果與第二枚硬幣的拋擲結果互相不受影響,所以事件A發(fā)生與否不影響事件B發(fā)生的概率。問題二:計算試驗1中的P(A),P(B),P(AB),你有什么發(fā)現(xiàn)?在該試驗中,用1表示硬幣“正面朝上”,用0表示“反面朝上”,則樣本空間Ω={(1,1),(1,0),(0,1),(0,0)},包含4個等可能的樣本點。而A={(1,1),(1,0)},B={(1,0),(0,0)}所以AB={(1,0)}由古典概率模型概率計算公式,得P(A)=P(B)=0.5,P(AB)=0.25, 于是 P(AB)=P(A)P(B)積事件AB的概率恰好等于事件A、B概率的乘積。問題三:試驗2:一個袋子中裝有標號分別是1,2,3,4的4個球,除標號外沒有其他差異。
6.例二:如圖在正方體ABCD-A’B’C’D’中,O’為底面A’B’C’D’的中心,求證:AO’⊥BD 證明:如圖,連接B’D’,∵ABCD-A’B’C’D’是正方體∴BB’//DD’,BB’=DD’∴四邊形BB’DD’是平行四邊形∴B’D’//BD∴直線AO’與B’D’所成角即為直線AO’與BD所成角連接AB’,AD’易證AB’=AD’又O’為底面A’B’C’D’的中心∴O’為B’D’的中點∴AO’⊥B’D’,AO’⊥BD7.例三如圖所示,四面體A-BCD中,E,F(xiàn)分別是AB,CD的中點.若BD,AC所成的角為60°,且BD=AC=2.求EF的長度.解:取BC中點O,連接OE,OF,如圖。∵E,F分別是AB,CD的中點,∴OE//AC且OE=1/2AC,OF//AC且OF=1/2BD,∴OE與OF所成的銳角就是AC與BD所成的角∵BD,AC所成角為60°,∴∠EOF=60°或120°∵BD=AC=2,∴OE=OF=1當∠EOF=60°時,EF=OE=OF=1,當∠EOF=120°時,取EF的中點M,連接OM,則OM⊥EF,且∠EOM=60°∴EM= ,∴EF=2EM=
4.That was an experience that frightened everyone. →That was _____________________. 答案:1. taking 2. being discussed 3. in the reading room 4. a frightening experienceStep 6 The meaning and function of V-ing as the predicative動詞-ing形式作表語,它通常位于系動詞后面,用以說明主語“是什么”或“怎么樣”一種表示主語的特質、特征和狀態(tài), 其作用相當于形容詞; 另一種具體說明主語的內(nèi)容, 即主語等同于表語, 兩者可互換。The music they are playing sounds so exciting. 他們演奏的音樂聽起來令人激動。The result is disappointing. 結果令人失望。Our job is playing all kinds of music. 我們的工作就是演奏各種音樂。Seeing is believing. 眼見為實。Step 7 Practice1. It is ________(amaze) that the boy is able to solve the problem so quickly.2. Buying a car is simply _______(waste) money. 3. Please stop making the noise—it’s getting ________(annoy). 4. complete the passage with the appropriate -ing form.La Tomatina is a festival that takes place in the Spanish town Bunol every August. I think many food festivals are __________ because people are just eating. however, this festival is _________ because people don't actually eat the tomatoes. Instead, they throw them at each other! the number of people ________ part in this tomato fight, can reach up to 20,000, and it is a very __________ fight that lasts for a whole hour. The _______ thing is how clean Bunol is after the tomatoes are washed away after the fight. this is because the juice form tomatoes is really good for making surfaces clean!答案:1. amazing 2. wasting 3. annoying4. boring interesting taking exciting amazing
The topic of this part is “Discover the reasons for festivals and celebrations.The Listening & Speaking & Talking part aims at talking about the experiences and feelings or emotions about the festivals and celebrations. This section aims at detecting the reason why the people celebrate the festivals, the time, the places, the types and the way of celebrations. It also explains why some traditions in the old celebrations are disappearing, like the firecrackers in the big cities and some new things are appearing like the prosperity of business or commerce. 1. Students can talk about what festivals they know and the reasons and the way of celebrating them.2. Students should learn the reading skills such as the headline and get the topic sentences, the structures of articles.3. Students can understand the past, the present situation of some festival around the world and why there are some changes about them. 4. Students can have the international awareness about the festivals.1. Students should learn the reading skills such as the headline and get the topic sentences, the structures of articles.2. Students can understand the past, the present situation of some festival around the world and why there are some changes about them.Step 1 Lead in---Small talkWhat festival do you like best ? Why ?I like the Spring Festivals because I can set off the fireworks, receive the lucky money and enjoy the Gala with my families.Step 2 Before reading---Pair workWhy do people celebrate different festivals ?The Spring Festivals is to celebrate the end of winter and the coming of spring and new life.The Mid-autumn Day is to celebrate the harvest and admire the moon.
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 3 Analyzing article structureActivity 31. Teachers raise questions to guide students to analyze the chapter structure of this diary and think about how to describe the festival experience. (1)What should be included in the opening/body/closing paragraph(s)?(2)How did the writer arrange his/her ideas?(3)What kind of interesting details did the writer describe?(4)How did the writer describe his/her feelings/emotions during the event?2. Students read and compare the three sentence patterns in activity 2. Try to rewrite the first paragraph of the diary with these three sentence patterns. After that, students exchange corrections with their partners. Such as:●This was my first time spending three days experiencing the Naadam Festival in China’s Inner Mongolia Autonomous Region and it was an enjoyable and exciting experience. ●I'll never forget my experience at the Naadam Festival because it was my first time to watch the exciting Mongolian games of horse racing, wrestling, and archery so closely. ●I'll always remember my first experience at the Naadam Festival in China’s Inner Mongolia Autonomous Region because it was so amazing to spend three days witnessing a grand Mongolian ceremony. Step 4 Accumulation of statementsActivity 41. Ask the students to read the diary again. Look for sentences that express feelings and emotions, especially those with the -ing form and the past participle. Such as:● …h(huán)orse racing, wrestling, and archery, which are all so exciting to watch. ● some amazing performances● I was surprised to see…● I was a little worried about. . . ● feeling really tiredOther emotional statements:●I absolutely enjoyed the archery, too, but the horse races were my favourite part. ●I'm finally back home now, feeling really tired, but celebrating Naadam with my friend was totally worth it. ●He invited me back for the winter to stay in a traditional Mongolian tent and cat hot pot. I can’t wait!2. In addition to the use of the -ing form and the past participle, the teacher should guide the students in the appreciation of these statements, ask them to memorize them, and encourage them to use them reasonably in writing practice.
The topic of this part is “Write about your festival experience”.During the Listening and Speaking and Talking, students are just asked to say out their festival experiences such as the Spring Festival, Mid-autumn Day, but this part students will be asked to write down their own festival experiences. During the reading part, it introduces the Naadam Festival in Inner Mongolia Autonomous Region, which can give students a good example to imitate. Students not only learn the festival, but touch and feel the Inner Mongolian’s character, the spirit and cultural atmosphere, which can help students form the cultural awareness and learn to enjoy and value the diversity of Chinese culture.Concretely, the dairy tells the experience that the author spent the Naadam Festival in Inner Mongolia Autonomous Region with his/her friend. The structure is clear. In the opening paragraph, it introduces the topic of the Naadam Festival and the whole feeling. Then it introduces the items of the festival like the ceremony, wrestling and horse racing. Finally, it summarizes this experience. Because this part is a travel journal, we must guide students pay more attention to these details: 1. use the first person. 2. use the past tense to tell the past thing and use the present or future tense to describe the scenery. 3. use the timeline to tell the development. 4. be careful for the author’s psychology, emotion and feeling, etc.1. Read quickly to get main idea; read carefully to get the detailed information about Naadam Festival.2. Learn the structure of the reading article and language.3. Write an article about a festival experience4. Learn to use the psychology, emotions and feeling in the writing.1. Write an article about a festival experience.2. Use the structure of the reading article and language.
1. 表示時間。Hearing these stories, I’m skeptical about the place. = When I heard these stories. . . 2. 表示原因。Not knowing his address, I can’t send this book to him. = Because/Since/As I don’t know his address. . . 3. 表示結果。His father died, leaving him a lot of money. =. . . and left him a lot of money4. 表示條件。Going straight down the road, you will find the department store. = If you go straight down the road. . . 5. 表示讓步。Being tired, they went on working. =Although they were tired. . . 6. 表示行為方式、伴隨情況或補充說明。He lay on the grass, staring at the sky for a long time. =. . . and stared at the sky for a long time注意:非謂語動詞作狀語時, 如所提供的動詞不能和句子中的主語保持一致, 動詞-ing形式必須有自己的邏輯主語, 通常由名詞或代詞來擔任, 這就是獨立主格結構。The last bus having gone, we had to walk home. (having gone的邏輯主語是the last bus, 而不是we)Weather permitting, the football match will be played on Friday. (permitting的邏輯主語是time, 而不是the football match)Step 7 Practice1. ________(study) hard, you are sure to get first prize. 2. People use plastic in their daily life, _______(leave) large amounts of waste. 3. ________(work) hard at your lessons, you are to succeed. 4. The old man, ____________(work) abroad for twenty years, is on the way back to his motherland. 5. ______________(finish) his homework, he was playing on the playground. Answers: 1. Studying 2. leaving 3. Working 4.having worked 5. Having finishedStep 8 HomeworkFinish the homework on Page 22.
Example:One day, a poor boy who was trying to pay his way through school by sending newspapers door to door found that he only had one dime(一角)left. He was so hungry that he decided to beg for a meal at the next house.However, he lost his nerve when a lovely young woman opened the door. Instead of a meal he asked for a drink of water. She thought he looked hungry so she brought him a large glass of milk. He drank it slowly, and then asked, “How much do I owe you?” “You don’t owe me anything,” she replied, “Mother has taught me never to accept pay for a kindness.” “Then I thank you from the bottom of my heart.” With these words, Howard Kelly left that house.Years later the woman became badly ill and was finally sent to the hospital in a big city. Dr. Howard Kelly, now famous, was called in. When he heard the name of the town she came from, a strange light filled his eyes. Dressed in his doctor’s clothes, Dr. Kelly went into her room and recognized her at once. From that day on, he gave special attention to her, and decided to do his best to save her life.At last the woman was saved. Dr. Kelly asked the business office to pass the final bill to him. He looked at it and then wrote something on the side. The bill was sent to the woman’s room. She was afraid to open it because she was sure that it would take the rest of her life to pay for it off. Finally she looked, and the note on the side of the bill caught her attention. She read these words: “Paid in full with a glass of milk, Dr. Howard Kelly.” Tear of joy flooded her eyes.
The topic of this part is “Learn to make choices in life”.The Listening & Speaking & Talking part aims at the moral dilemmas, and this part is about making choices in life. The heroin is Lin Qiaozhi, a famous medical scientist, made a great contribution to our country’s medical care. Most importantly, her life experience can inspire our students whether in studying or the development of career. she had moral dilemmas and life choices, which are similar to the students who will step into society. Besides, Lin has quite good virtues like kindness, self-improvement, insistence, job-loving , generosity and responsibility, which is worth being learned.Concretely, this article is a biography about Lin Qiaozhi. The article tells her whole life according the timeline, among which the life choices is emphasized. For example, whether married or chased her dream, returned home or stayed abroad, family or public, her choices all reflected her faith, spirit, responsibility and devotion.1. Fast reading to get the detailed information about Lin Qiaozhi; careful reading to do the deductive information.2. Learn the reading skills--deductive judgement according the context.3. Study the structure features and language features. 4. Communicate about Lin’s life choices and reflect their own life choices.1. Learn the reading skills--deductive judgement according the context.2. Study the structure features and language features.3. Communicate about Lin’s life choices and reflect their own life choices.Step 1 Lead in---Small talkWhat are some important life choices?Importance choices: university study, jobs and marriage partners. Because they can determine our future.
1. 這個寓言是一個關于一位國王古寓言。 The fable is an old fable about a king.2.作者用這個故事讓讀者對于社區(qū)的問題負有個人責任的必要印象深刻。The author used the story to impress upon readers with the need to take personal responsibility for problems in the community.3. 這個故事十分成功的實現(xiàn)了它的目的。The story was quite successful in achieving its purpose.Step 7 WritingPlease write a review of the story according the outline above.The fable is an old fable about a king who thought his people are lazy, so he put a large stone in the middle of the road and hides and waited to see if anyone will try to move it.The author used this story to impress upon readers with the need to take personal responsibility for problems in the community. The story was quite successful in achieving its purpose, and I liked it because it had a clear moral.However, while the moral of the story is clear, the actions of the king seemed pointless to me, because none of the characters in the story learnt anything. For this reason, I think there are better stories that can be used to impress upon people with the need for personal responsibility.Step 8 Pair workExchange drafts with a partner. Use this checklist to help your partner revise his/her draft.1. Does the writer give a short description of the story ?2. Does the description include the most important details of the story ?3. Does the writer give his or her opinion about the character or their actions ?4. Is the review well-organised ? 5. Does the writer use the -ing form as the adverbial correctly in the writing ?6. Are there any grammar, spelling, or punctuation errors ?Step 9 HomeworkPut up your revised draft in the classroom or read it to your class.
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.