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人教版高中生物必修2DNA的復制說課稿
設問：DNA復制后兩個子代DNA分子與親代DNA分子是否完全相同？為什么？通過設問，讓學生進一步理解和鞏固DNA復制的全過程。接下來讓學生總結出DNA復制的四大基本條件：① 模板：開始解旋的DNA分子的兩條單鏈；② 原料：是游離在核液中的脫氧核苷酸；③ 能量：是通過水解ATP提供；④ 酶：酶是指一個酶系統(tǒng)，不僅僅是指一種解旋酶。最后通過以上分析，總結出DNA復制的意義以及在生活中的應用：意義：DNA通過復制，使遺傳信息從親代傳給子代，從而保證了物種的相對穩(wěn)定性，保持了遺傳信息的連續(xù)性，使物種得以延續(xù)。應用：目前DNA分子廣泛應用于刑事案件偵破等方面：如：DNA分子是親子鑒定的主要證據之一。把案犯在現(xiàn)場留下的毛發(fā)、血等進行分析作為破案的證據，與DNA有關。五、設計課堂練習：設計一題典型課堂練習：即有關半保留復制及計算的習題：
人教版高中英語必修1Nelson Mandela--A Modern Hero說課稿
In this step, give students a few minutes to read the passage . While they are reading, I will write some key words of the text on the blackboard. Then ask students to retell the passage according to the key words.By retelling, students can improve their ability of language organization and have an overall understanding of the article.Step 4 Group discussionIn this step, students will be divided into groups of 4 to discussion the following question: What qualities make a great person?After their discussion, invite a few groups to make a report to the class.This group discussion can practice students’ oral English and cultivate their abilities of cooperation and communication.Step 5. HomeworkLet students write a short passage to introduce a great person he or she admires.The homework can consolidate the knowledge the students have learned and cultivate their writing ability. Part 6 Blackboard Design（板書設計）That’s all my teaching procedures. Finally, I’d like to say sth about part 6 blackboard design. On the top is the title. On the left, there will be some new words and expressions. In the middle of the blackboard, I will write some useful sentence structures so that the students can know clearly what they’ve learned and then try to master the knowledge.OK. That’s all for my presentation. Thank you for your attention.
人教版高中英語必修2The Olympic Games說課稿2篇
Purpose of my design:To ask the students to do these two tasks will make the Ss predict the story of this passage. As a result, it will deepen Ss’ memory of this story because they will have their own understanding of this story.Step 3. While-readingTask 1. (Individual work _____min)Skimming: ask students to skim the text and the main ideas of each paragraph in this passage. Please read it quickly and then match the sentences with the letters.Task 2. (Individual work _____min)Scanning: read the text quickly and decide the whether the following statements are true or false and give reasons.Task 3. (Pair work _____min)Listen to the tape and fill in the banks. Then read the paragraph with expression to your partner.Task4 (individual work min)Listen to the tape again and write down the main idea in one sentence.Purpose of my design: Enable students to understand the given material better by using different reading skills. And proper competition can arouse the Ss’ interest in English learning. “Task-based” teaching method is used here todevelop the Ss’ ability of communication and also their ability of co-operation will be well trainedStep 4. Post-readingTask 1. (Individual work, pair work, group work, class work; _____min)Discussion (group of 4):1. If you were Hippomenes, would you run against Atlanta?2. Do you think Hippomenes deserved to win the race? Why or why not?Step 5. HomeworkPlease read the story again carefully after class and imagine: What will happen during the race between Hippomenes and Atlanta? Who do you think will win the race? Do you think Atlanta would marry Hippomenes? Write an end for the story with thses questions.Purpose of my design: Homework is so important and necessary for to master the knowledge they learned after class. It will check whether the Ss achieve the teaching aims.Part 5 Blackboard design
人教版高中英語必修5Life in the Future說課稿5篇
Good afternoon, everyone. It’s my great pleasure to be here sharing my lesson with you. The content of my lesson is Senior English for China Book5 Unit 3 Life in the Future. I’ll be ready to begin this lesson from six parts: Analysis of the teaching material, Analysis of the students, Teaching aims and important and difficult points, Teaching methods and aids, Teaching procedures, and Blackboard design. First, let me talk about the teaching material.Part 1 Analysis of the Teaching Material:This unit is about what human beings’ life will be like in about one thousand years. By studying of this unit, we’ll Enable the students to know the changes in humans’ life and some new inventions bringing about the change and develop the interest in science. This lesson plays an important part in the English teaching in this unit. This is an important lesson in Book Five. From this lesson, it starts asking the Ss to grasp contents of each passage. Therefore, this lesson is in the important position of the teaching material. If the Ss can learn it well, it will be helpful to make the Ss learn the rest of this unit.Part 2 Analysis of the SsAs Senior2 Ss, they are at different levels of English fluency, some of them have lost interest in English. So during the lesson, I arrange a variety of activities to let all of them join in to attract their interest and let them be confident and taste the joy of success.
人教版高中地理必修2綠色產品知多少說課稿
各小組派代表匯報。4、教師提出問題組織學生討論：⑴要想了解更多的綠色食品，了解綠色食品的銷售情況，我們應該怎么做？⑵要想了解廣大消費者對綠色食品的態(tài)度，食用綠色食品的意義，是否懂得辨認綠色食品，以及什么樣的人群對此知識最缺乏等，我們應該怎么做？組織學生匯報交流。5、做個“綠色食品”廣告設計師。為你喜歡的綠色食品設計廣告語，每組推薦一個。6、讓學生了解綠色食品認證程序。7、綠色食品打“假”隊員在行動。8、向學生介紹生態(tài)綠色食品基地。三、活動總結：通過研究、探討，了解學生對綠色食品的態(tài)度。提問：民以食為天，吃，是一個大問題，如果你的爸爸媽媽讓你到超市買牛奶、方便面等，你會選擇什么樣的食品？為什么？希望通過今天的學習，同學們能夠做到綠色消費，也希望你們向自己的家人、向周圍的了解學生對“無公害食品”、“有機食品”與“綠色食品”的認識。
人教版高中語文必修2《就任北京大學校長之演說》說課稿3篇
（三）教學重、難點1、教學重點：結合課文，了解演講辭針對性強、條理清楚、通俗易懂、適當的感情色彩等特點。2、教學難點：深入理解文章內涵，聯(lián)系現(xiàn)實，體會本文的現(xiàn)實意義二、說學情高中學生在初中階段已經接觸過演講辭了，對演講詞的特點已經有了一些基本的知識，因此本輪的教學應該讓他們在此基礎上有所提高。本文是學生在高中階段第一次接觸演講辭，有必要讓他們了解演講辭的特點及課文如何體現(xiàn)這些特點的。隨著年齡的增長，生活閱歷的增加，高中學生正逐漸形成自己對世界、對人生的看法，蔡元培先生的這篇文章能很好地激發(fā)他們對當前的高中學習和未來的大學生活進行思考。此外，學生對北大的歷史及蔡元培先生作這番演講的時代背景了解不深，應作出補充說明。
人教版高中歷史必修3建國以來的重大科技成就說課稿2篇
說教材（一）、本課在教材中的地位：教材在第3單元介紹了古代中國科技的輝煌。第四單元介紹世界近代科技成就，本課主要介紹了現(xiàn)代中國的科技成就。通過對本課的學習，有利于學生感受中國科技古代輝煌、近代落后、現(xiàn)代又取得很大成就這一重要歷程，因此本課在教材中具有重要作用。（二）教學內容分析和課標要求：本課主要介紹新中國成立以來我國科學技術成就及作用。從核研究、航空技術、農業(yè)新品種研究、計算機應用、生物技術五方面介紹了新中國成立以來取得的舉世矚目的成就。課標對這部分知識作了如下的要求：列舉新中國成立以來科技發(fā)展的主要成績，認識科技進步在現(xiàn)代化建設中的重大作用。根據以上對教材內容的分析和課標要求，我將本課的三維目標確定如下：（三）、教學目標1、知識與能力：識記建國后六十多年來所取得的科技成就；理解科學技術是生產力的論斷；探究科技的發(fā)展在現(xiàn)代化建設中的重要作用。
人教版高中歷史必修1古代希臘民主政治說課稿
（4）評價民主通過對雅典公民享有充分的言論自由的介紹及展示伯利克里的講話、陶片放逐法，使學生認識到，雅典的民主在統(tǒng)治階級內部已經達到了非常高的層次，并促進了希臘人完整人格的形成。通過伯利克里講話、圖片、文字分別講述希臘人重責任感、渴求知識的民族性格，并請學生朗讀有關雅典人生活的有關文字，讓學生在閱讀中感情逐漸升溫，引發(fā)學生對民主的充分認同及對雅典人重精神生活的無限神往。問題設置：讓學生思考雅典民主政治對后世西方政治制度的重大影響。同時指出“民主是不可抗拒的歷史潮流！”讓學生在原有知識的基礎上認識民主政治的必然性。用書中的兩段材料分析希臘民主政治的特征和實質，分析其影響。4.課堂小結對本課內容進行概括性的總結5.知能訓練，運用遷移體現(xiàn)一定的層次性，滿足不同層次學生的要求。6.布置作業(yè)撰寫歷史論文首先布置論文范圍、主題；其次進行舉例；最后提供相關查閱資料的網址。
人教版高中歷史必修1資本主義政治制度在歐洲大陸的擴展說課稿
1789年法國大革命后，共和派與君主派之間進行了長期反復的斗爭，直到1875年法蘭西第三共和國憲法通過才最終確立了共和政體，它為法國資本主義的進一步發(fā)展奠定了基礎。專制色彩濃厚的普魯士通過王朝戰(zhàn)爭這種自上而下的形式，完成了德國的統(tǒng)一。1871年德意志帝國憲法頒布，德國君主立憲政體確立，保留了濃厚的專制殘余和軍國主義傳統(tǒng)。但資產階級代議制的建立使德國的資本主義工業(yè)迅速發(fā)展起來，19世紀末躋身到世界強國行列。資本主義政治制度擴展到了歐洲大陸，隨著這兩個國家資本主義政治制度的確立，近代西方主要資本主義政治制度得以最終確立。四、板書一、法國共和政體確立的艱難歷程1、艱難 （1）表現(xiàn) （2）原因2、確立標志：法蘭西第三共和國憲法
人教版高中歷史必修1從漢至元政治制度的演變說課稿2篇
二、君主專制的演進（即中央政治制度的演變）通過地方政治制度演變的學習，掌握方法以后，以學生歸納整理基本線索為主，教師適當點撥，注意糾錯。1． 漢承秦制，又有所變化。教師點撥強調繼承與發(fā)展兩個方面。創(chuàng)設情景：同學們看了電視連續(xù)劇《漢武大帝》后，知道漢武帝劉徹在繼位之后，就急于對西漢王朝的政治制度進行改革。那么，西漢初期中央政治制度的基本框架是怎樣的呢？漢武帝為什么要對它進行改革呢？改革后的西漢中央集權制度又是怎樣的呢？請大家議一議，想一想。主干知識：西漢初期的中央政治制度的最大特點是“漢承秦制”。具體表現(xiàn)在兩個方面：一是繼續(xù)實行皇帝制度，維護皇權，這一做法也為后來各王朝所沿用；二是在中央設立三公，分別掌管行政、監(jiān)察和軍事。到漢武帝時，“中朝”成為西漢重要的中央決策機構，尚書令的權力日益重要，以丞相為首的三公九卿的權力被削弱，演化為執(zhí)行機構。到了東漢光武帝時，進一步剝奪三公權限，擴大尚書的權力。
人教版高中地理必修3荒漠化的防治—以我國西北地區(qū)為例說課稿
（設計意圖： 通過這兩個問題探究的形式可以了解學生對二、干旱為主的自然特征這一知識點的掌握情況，隨堂練習有利于鞏固強化學生的條例性知識。）三、荒漠化的成因1、自然因素：干旱、氣候異常2、人為因素：（是荒漠化發(fā)生、發(fā)展的決定因素）自然原因啟發(fā)學生利用已經學過的知識（干旱為主的自然特征）和給出的PPT資料來進行分析。人為原因以其危害結果用圖表和圖片的形式展示，使學生認識到人為因素是導致荒漠化最主要的因素。（設計意圖：通過分析自然因素提供學生分析一區(qū)域環(huán)境建設的自然基礎條件，而這也是較難的一點，再者，通過分析人為原因，是學生樹立區(qū)域生態(tài)環(huán)境保護意識。）四、布置作業(yè)：書本課本20—22的活動—— 非洲薩赫勒地區(qū)荒漠化的自然、社會經濟
人教版高中歷史必修3物理學的重大進展說課稿2篇
二、相對論的創(chuàng)立【課件】展示下列材料艾伯特·愛因斯坦（1879——1955），1879年3月14日誕生在德國烏爾姆的一個猶太人家中。1894年舉家遷居意大利米蘭。1900年畢業(yè)于瑞士蘇黎世工業(yè)大學。愛因斯坦被認為是最富于創(chuàng)造力的科學家，他不但創(chuàng)立了相對論，還提出了光量子的概念，得出了光電效應的基本定律，并揭示了光的波粒二重性本質，為量子力學的建立奠定基礎。為此榮獲1921年度的諾貝爾物理學獎。同時，他還證明了熱的分子運動論，提出了測定分子大小的新方法?！締栴}】19世紀末20世紀初愛因斯坦對物理學的貢獻是什么？意義是什么？為什么會出現(xiàn)？1、背景：經典物理學的危機。19世紀末三大發(fā)現(xiàn)：x射線、放射性和電子，經典力學無法解釋研究中的新問題，如：黑體輻射、光電效應等。2、相對論的提出及主要內容：（1）“狹義相對論”和光速不變原理：1905年提出。
人教版高中語文必修5《說“木葉”》教案
【教學目標】Ⅰ、學習理解詩歌語言的暗示性特質。Ⅱ、根據詩歌語言的特質，進行遷移，領略詩歌的精妙之處，給同學如何鑒賞詩歌提供實感。㈠、導入：各位同學，有個成語叫"一字千金"。對我而言，第一次領略到一個字的分量，是在小學三年級的時候，一次作文評析課上。當時我對自己的文章充滿了期待，希望能得到老師的贊賞。記得老師進來后的第一句話是"有一篇文章，我就沖它用了一個字，我給它打95分。打這樣的高分，對我來說，是極為難得的。"同學都充滿了好奇，老師接著說"這個字就是一個'悟'字。我們的同學都說我學到了，我明白了，我懂得了一個道理，而這位同學卻用了一個'悟'字，難能可貴。"這篇文章不是我的，在羨慕的同時，一個字在文章中的分量就深深的刻在了我的心上。文學作品中，一個字精妙與否，足以決定作品是流光溢彩，還是黯然失色。尤其是我們的古典詩詞，用簡短的幾個字，造就的卻是豐富的情感與博大的意境。讀后滿口余香，卻是妙處難與君說。這跟詩歌的語言是密不可分的。今天，我們就通過《說"木葉"》一文，對中國古典詩詞語言特質作一番探幽。
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計三
The price is the same as(the price was)before the war.價格與戰(zhàn)前相同。(4)定語從句中的“關系代詞＋助動詞be”可以省略。The ticket(that/which was)booked by his sister has been sent to him.他妹妹訂的那張票已送到了他那里。Step 5 PracticeActivity 3(1) Guide students to complete the four activities in the Using Structures part of exercise book, in which activities 1 and 2 focus on ellipsis in dialogue answers, activity 3 focus on signs and headlines, two typical situations where ellipsis is used, and activity 4 focus on ellipsis in diary, an informal style.(2) Combine the examples in the above activities, ask students to summarize the omitted situations in groups, and make their own summary into a poster, and post it on the class wall after class to share with the class.(This step should give full play to the subjectivity of students, and teachers should encourage students to conclude different ellipsis phenomena according to their own understanding, they can conclude according to the different parts omitted in the sentence.)Step 6 Homework1. Understand and master the usages of ellipsis;2. Finish the other exercises in Using structures of Workbook.1、通過本節(jié)內容學習，學生是否理解和掌握省略的用法；2、通過本節(jié)內容學習，學生能否根據上下文語境或情景恢復句子中省略的成分，體會使用省略的效果；3、通過本節(jié)內容學習，學生能否獨立完成練習冊和導學案中的相關練習。
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計二
(2)Consolidate key vocabulary.Ask the students to complete the exercises of activity 6 by themselves. Then ask them to check the answers with their partners.(The first language:Damage of the 1906 San Francisco earthquake and fire.A second language: Yunnan - one of the most diverse provinces in China).Step 5 Language points1. The teacher asks the students to read the text carefully, find out the more words and long and difficult sentences in the text and draw lines, understand the use of vocabulary, and analyze the structure of long and difficult sentences.2. The teacher explains and summarizes the usage of core vocabulary and asks the students to take notes.3. The teacher analyzes and explains the long and difficult sentences that the students don't understand, so that the students can understand them better.Step 6 Homework1. Read the text again, in-depth understanding of the text;2. Master the use of core vocabulary and understand the long and difficult sentences.3. Complete relevant exercises in the guide plan.1、通過本節(jié)內容學習，學生是否理解和掌握閱讀文本中的新詞匯的意義與用法；2、通過本節(jié)內容學習，學生能否結合文本特點了解文章的結構和作者的寫作邏輯；3、通過本節(jié)內容學習，學生能否了解舊金山的城市風貌、文化特色，以及加利福尼亞州的歷史，體會多元文化對美國的影響。
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計四
該板塊的活動主題是“介紹一個有顯著文化特征的地方”( Describe a place with distinctive cultural identity)。該板塊通過介紹中國城繼續(xù)聚焦中國文化。本單元主題圖呈現(xiàn)的是舊金山中國城的典型景象, Reading and Thinking部分也提到中國城,為該板塊作鋪墊。介紹中國城的目的主要是體現(xiàn)中國文化與美國多元文化的關系,它是美國多元文化的重要組成部分。中國城也是海外華人的精神家園和傳播中國文化的重要窗口,外國人在中國城能近距離體驗中國文化。1. Read the text to understand the cultural characteristics of Chinatown in San Francisco and the relationship between Chinese culture and American multiculturalism;2. Through reading, learn to comb the main information of the article, understand the author's writing purpose and writing characteristics;3. Learn to give a comprehensive, accurate, and organized description of the city or town you live in;Learn to revise and evaluate your writing.Importance:1. Guide the students to read the introduction of Chinatown in San Francisco and grasp its writing characteristics;2. Guide students to introduce their city or town in a comprehensive, accurate and organized way;3. Learn to comb the main information of the article, understand the author's writing purpose, and master the core vocabulary.
新人教版高中英語必修3Unit 3 Diverse Cultures教學設計一
Activity 81.Grasp the main idea of the listening.Listen to the tape and answer the following questions:Who are the two speakers in the listening? What is their relationship?What is the main idea of the first part of the listening? How about the second part?2.Complete the passage.Ask the students to quickly review the summaries of the two listening materials in activity 2. Then play the recording for the second time.Ask them to complete the passage and fill in the blanks.3.Play the recording again and ask the students to use the structure diagram to comb the information structure in the listening.(While listening, take notes. Capture key information quickly and accurately.)Step 8 Talking Activity 91.Focus on the listening text.Listen to the students and listen to the tape. Let them understand the attitudes of Wu Yue and Justin in the conversation.How does Wu Yue feel about Chinese minority cultures?What does Justin think of the Miao and Dong cultures?How do you know that?2.learn functional items that express concerns.Ask students to focus on the expressions listed in activity. 3.And try to analyze the meaning they convey, including praise (Super!).Agree (Exactly!)"(You're kidding.!)Tell me more about it. Tell me more about it.For example, "Yeah Sure." "Definitely!" "Certainly!" "No kidding!" "No wonder!" and so on.4.Ask the students to have conversations in small groups, acting as Jsim and his friends.Justin shares his travels in Guizhou with friends and his thoughts;Justin's friends should give appropriate feedback, express their interest in relevant information, and ask for information when necessary.In order to enrich the dialogue, teachers can expand and supplement the introduction of Miao, dong, Lusheng and Dong Dage.After the group practice, the teacher can choose several groups of students to show, and let the rest of the students listen carefully, after listening to the best performance of the group, and give at least two reasons.
新人教版高中英語必修3Unit 1 Festivals and Celebrations教學設計二
1. Ss look at the picture and scan the passage to understand the main idea while teacher is giving the following questions to inspire Ss to think.*Where are those people?*What are they doing?*Why are they so excited?2. Ss complete the passage with the appropriate -ing form. Then discuss and check the answers with class.Answers: boring, interesting, taking, exciting, amazing3. The teacher raises questions for the students to discuss and encourages them to express their opinions.*Do you like La Tomatina? Why or why not?4. Each group representative reports the discussion result, the teacher gives feedback and the evaluation.Step 6 PracticeActivity 41. Ss complete the Ex 2 in Using structures.2. Check the answers after finishing the exercises.①The dragon boat races are the most exciting part of the Dragon Boat Festival.② The children were excited to go Easter egg hunting.③What an amazing performance! This is the best music festival I have ever been to.④We were amazed by her funny-looking hat.⑤His inspiring speech at the conference won the admiration/ favour of the audience.⑥This is a challenging game to test your memory and observation capabilities. 3. T asks Ss to finish Ex 3 and 4 in Using structures by themselves, then check the answers with class.Step 6 Homework1. Understand and master the functions and usage of the -ing form;2. Finish the other exercises in Using structures.1、通過本節(jié)內容學習，學生是否理解和掌握動詞-ing形式作定語和表語的功能和意義；2、通過本節(jié)內容學習，學生能否在理解文段內容的基礎上，根據上下文語境和表達邏輯，能正確運用動詞-ing形式描述節(jié)日慶典。3、通過本節(jié)內容學習，學生是否歸納和積累用于表達情緒的相關詞匯。
新人教版高中英語必修3Unit 1 Festivals and Celebrations教學設計一
本板塊的活動主題是“談論節(jié)日活動”（Talk about festival activities），主要是從貼近學生日常生活的角度來切入“節(jié)日”主題。學生會聽到發(fā)生在三個國家不同節(jié)日場景下的簡短對話，對話中的人們正在參與或將要親歷不同的慶祝活動。隨著全球化的進程加速，國際交流日益頻繁，無論是國人走出國門還是外國友人訪問中國，都已成為司空見慣的事情。因此，該板塊所選取的三個典型節(jié)日場景都是屬于跨文化交際語境，不僅每組對話中的人物來自不同的文化背景，對話者的身份和關系也不盡相同。1. Master the new words related to holiday: the lantern, Carnival, costume, dress(sb)up, march, congratulation, congratulate, riddle, ceremony, samba, make - up, after all. 2. To understand the origin of major world festivals and the activities held to celebrate them and the significance of these activities;3. Improve listening comprehension and oral expression of the topic by listening and talking about traditional festivals around the world;4. Improve my understanding of the topic by watching pictures and videos about different traditional festivals around the world;5. Review the common assimilation phenomenon in English phonetics, can distinguish the assimilated phonemes in the natural language flow, and consciously use the assimilation skill in oral expression. Importance:1. Guide students to pay attention to the attitude of the speaker in the process of listening, and identify the relationship between the characters;2. Inspire students to use topic words to describe the festival activities based on their background knowledge. Difficulties:In the process of listening to the correct understanding of the speaker's attitude, accurately identify the relationship between the characters.
新人教版高中英語必修3Unit 1 Festivals and Celebrations教學設計三
*wide range of origins(= a great number of different origins, many kinds of origins)*It featured a parade and a great feast with music, dancing, and sports. (=A parade and a great feast with music, dancing, and sports were included as important parts of the Egyptian harvest festival.)*.. some traditions may fade away and others may be established.(= Some traditions may disappear gradually, while other new traditions may come into being.）Step 6 Practice(1) Listen and follow the tape.The teacher may remind the students to pay attention to the meaning and usage of the black words in the context, so as to prepare for the completion of the blanks in activity 5 and vocabulary exercises in the exercise book.(2) Students complete the text of activity 5 by themselves.The teacher needs to remind the students to fill in the blanks with the correct form of the vocabulary they have learned in the text.Students exchange their answers with their partners, and then teachers and students check their answers.(3)Finish the Ex in Activity 5 of students’ book.Step 7 Homework1. Read the text again, in-depth understanding of the text;2. Discuss the origin of festivals, the historical changes of related customs, the influence of commercial society on festivals and the connotation and essential meaning of festivals.3. Complete relevant exercises in the guide plan.1、通過本節(jié)內容學習，學生是否理解和掌握閱讀文本中的新詞匯的意義與用法；2、通過本節(jié)內容學習，學生能否結合文本特點快速而準確地找到主題句；3、通過本節(jié)內容學習，學生能否理清論說文的語篇結構和文本邏輯，了解節(jié)日風俗發(fā)展與變遷，感悟節(jié)日的內涵與意義。