
Textbook: Senior English for China (Book 4), by Liu Daoyi Time Allotment: 1 period (40 minutes)Date: March 20, 2014Teaching aids: blackboard, Multi-media, Power Point, chalk I. Text Analysis (教材分析)This unit is about body language, and the text selected in the reading part demonstrates the difference and similarity of body language in many parts of the world. Through learning this passage, students are required to raise their awareness of using body language in different parts of the world. As body language is closely related to our daily life, it is easy to arouse students’ interest in learning this text. Reading skills and speaking training are designed around the text.II. Teaching Objectives (教學(xué)目標)By the end of the lesson, students will be able to:1. Language Skill Objective(語言技能目標): develop reading ability (skimming and scanning)as well as speaking ability.2. Cultural Knowledge Objective(文化知識目標): know about the cultural differences of using body language.3. Affective Objective(情感目標): increase students’ awareness of using body language correctly in different cultures. III.Teaching Focuses and Difficulties(教學(xué)重點和難點)1. Teaching Focuses(教學(xué)重點): the difference and similarity of body language in many parts of the world.2. Teaching Difficulties(教學(xué)難點): develop students’ reading abilities of skimming and scanning and ask the students to show their opinions with fluent English.

Good morning, distinguished judges:It’s my honor to talk about my teaching ideas with you. Today my topic is Women of Achievement. My presentation consists of six parts: the analysis of teaching material and student, teaching aims, key and difficult points, teaching and studying method, teaching procedures and blackboard design.First, let’s focus on the analysis of teaching material. This lesson is from New Senior English for China Student’s Book 4 Unit 1, the reading part. The main topic of the passage is the introduction of a student of Africanwildlife. After this lesson, the students will learn more information about her studying chimps in Africa, and their reading and speaking abilities can be developed as well.The next part is the analysis of students. My students are in senior high students. They have learnt English for many years, they’ve known many words and sentences, but their speaking and reading abilities are still not very good. So I will practice their speaking and reading abilities through different exercises.According to the New Standard Curriculum and the present situation, I set the teaching aims as follows: firstly, knowledge aims. Students can grasp some new words, such as worthwhile, move off. Moreover, students can understand the content of the passage and get familiar with the topic of studying chimps in wildlife. Secondly, ability aims. Students can use reading strategies such as skimming and scanning in reading process. Thirdly, emotional aims. Students can have the awareness of protecting animals and care about animals.Based on the above analysis, the key point of this lesson is to get the main idea and the detailed information from the passage; the difficult point is to talk about the wildlife protection and use reading strategies.

Good afternoon, teachers, It’s my great pleasure to be here sharing my lesson with you.The content of my lesson is Senior English Book 3 Unit 5 Canada —— “The true North”.I’ll be ready to begin this lesson from five parts. Analysis of the teaching material,the teaching methods,the studying methods, the teaching procedure,and Blackboard design.First, let me talk about the teaching material.Part 1 Teaching Material:This unit is about the introduction of Canada. By studying of this unit,we’ll enable the students to learn the geography, population, main cities, and natural beauty, natural resources of Canada. Through the training of the unit, it also requires students to learn some Language skills such as the expressions of position and emotions.So it plays an important part in the English teaching in this book.After studying the teaching material and analyzing the rule of children’s growing of mind,I think the teaching aims are the followings:1.Knowledge objects:(1) make the students learn some new words and phrases(2) make the students understand the content of the lesson.2.Ability objects:(1)To develop the Ss’ abilities of listening, speaking, reading and writing. Especially reading and speaking ability.(2) learn to talk about the characters of Canada in English(3)To train the Ss’ ability of working in pairs.3.Emotion objects:(1)Enable students to understand the characters of Canada..(2)Stimulate Ss to work hard to make China stronger.Part 2 Teaching Methods:I think helping students learn to master new words and phrases and improve the students’ reading and speaking ability is import and the difficult.According to the analysis of the teaching material and the import points and the difficult points,I will use the following teaching methods : question-guiding approach; fast-reading and careful reading; multi-media teaching methods; discussion

Language learning needs a context, which can help the learners to understand the language and then can product comprehensible output, so computer has the advantages to make the materials attractive.Part 3 Learning MethodsTask-based, self-dependent and cooperative learningPart 4 Teaching ProcedureStep One Lead-in“Interest is the best teacher.” Therefore, at the very beginning of the class, I should spark the students’ mind to focus on the centre topic “the band”. I’ll show some pictures of food to attract their attention and then bring some questions.Question:What kind of food they like?What should go into a good meal?The answers must relate to the diet. After this, the students will be eager to know something about a balance diet and this is the very time to naturally lead the class into Step 2Step 2 Reading for information: skimming and scanning In this step, I use Task-based Language Teaching method, which can give students a clear and specific purpose while skimming and scanning the context.Task 1 General ideaThe students will be asked to just glance at the title and the pictures of the passage, and then guess what they will read in the text. And they’ll be divided into groups of four to have a discussion.The purpose is to inspire the students to read actively, not passively. In addition, the task is to develop the students’ reading skill by making prediction and to encourage the students to express their thoughts in English and cooperate with each other.Task 2 Main idea of each paragraphCooperative learning can raise the students’ interest and create an atmosphere of achievement. Based on this theory, I divide the whole class into 4 groups to skim the whole text and get the main idea of each paragraph.

Then I would ask them to think of a funny English or Chinese and tell it to partners. While telling stories, they can use expressions and some acting to help make the story funny. 5 minutes would be given to do this.Those stories they told there will be the material for their writing. Soletting them tell it at first is helpful. And they can make a difference between telling a funny story and writing it down. Generally speaking, it is difficult forstudents to write well because they don’t know what to write and how to write. Asking them to tell their own stories at first can help them come up with what to write.After their telling, I would invite someone to share his/her story with all of us and I would write it down on the blackboard.This example story would be used as a sample to illustrate the format of funny story. Different from a story from teacher or textbook, a story from students can obviously become a interesting material to draw students’ attention.Then I would ask the whole class to put this story into several parts. It might be a little bit difficult for them. So I would ask them to find out whether all the sentences are necessary. After delete some sentences, there are 6 sentences left behind. Then they can easily put them into three parts. After interaction with students, I would teach them the right terms for each part and conclude the format of funny story.This step is the key and difficult point in my lesson. So I mainly usetask-based teaching method in this part and the task for students was divided into several stages. With the separated difficult level, students can find there are usually three parts in writing. They can also learn to write without the unnecessary parts in the process of analyzing. And then I wouldn’t rush to tell them the right terms to them directly. Instead, I would ask them to name them by their own. A confused mind is better for acquiring knowledge.While-writing:Then I would give students 7 minutes to write down this story, without other requirements.With all the preparations in pre-writing, students’ difficulties were cleared. So it would be much easier for them to write down the story within 7 minutes. There are no other requirements because students’ first writing is actually a drafting. It would be revise and edit several times later. Writing, as a skill

The oldest and the most popular park in the worldenjoy the exciting activities thereget close to the life-size cartoon characters like Mickey Mouse and Donald Duck Step 3 Pre-reading1.What do you suppose a theme park is ?2.What do you think you can see in a theme park?(1.It is a kind of amusement park which has a certain theme – that the whole park is based on. 2.buildings, castles, statues, rare animals and birds, and so on.) Step 4 Reading ----- Theme Parks –---- Fun and More Than Fun1.Predict : Read the title and the pictures on P. 34 and PredictWhat is the meaning of the title “Theme Park – Fun and more than fun”?(The title means that theme parks are fun to visit, but that they can also be educational and can offer useful information.)2.Skimming Fast read and answer:What activities can we take in a theme park?Amusement park: Bumper car Merry-go-round slide bungee jumping Free-fall rides Horror films Pirate ship Ferris wheel roller coaster3.Scanning Read again and you will find various theme parks are mentioned in the passage . Then what are they ?Theme parks: Sports theme park History theme park Culture theme park Marine or Ocean theme Park Future park Science theme park Disneyland4.Careful reading and find the main idea of each paragraph:THEME PARKS---- entertaining/ educationalPara.1 Traditional parks are places to go for relaxation and to have time away from our busy lives.Para.2 Theme parks are different They’re large and full of things to do, see and buy.Para.3 Theme parks are built around a single idea or theme. One example is a sports park.Para.4 Another kind of theme park is historical more and cultural and can be educational.Para.5 Disneylandwas the first theme park. It is based on the fantasy life and characters of Disney’s films.Para.6 Some examples of educational theme parks include sea world parks and science parks.

Knowledge objectives:(1) to make Ss grasp the usage of words, expressions and sentence structures: statistics, struggle, thanks to, rid of, some patterns for persuasion, the “ing” form as subject and object;(2)to use learnt knowledge to persuade sb.Ability objectives:(1) to develop Ss’ reading skills(skimming, scanning, word guessing);(2) to improve Ss’ speaking, communicating and cooperating skills.Emotional objectives:to make Ss know the contribution of Yuan,and learn his spirit and his simple life time.Teaching important and difficult points:(1) some words, expressions and sentence structures mentioned above;(2)the content of the text;(3)training their reading and speaking skills.Teaching methods: CLT, TBLT,QT.Learning strategies: CLS, QLS, TBLS.Teaching procedures:Step 1 lead-in: (1) teacher plays a piece of recent news from CCTV about the harvest of the super hybrid rice, and ask students whether they know Yuan or not, and talk about him and his contribution.(2)Brain storm: let Ss describe Yuan in their minds including his appearance, his living condition and so on.Step 2 fast reading tasks:(1)teacher introduces Yuan and super hybrid rice(2)make Ss read the text as fast as possible with questions. Such as: what’s the general ideaof this passage? What’s Yuan’ dream? (skimming and scanning skill)Step 3 intensive reading tasks(1)let Ss read the text silently, find topic sentence of each paragraph and draw the difficult sentences and the knowledge what they don’t understand.(words guessing)(2)teacher and Ss talk about the important words, expressions and sentences together, and ask Ss to retell the content of the text.(summarizing and paraphrasing)(3)teacher summarize this part.(4) read again following the courseware.

通過寫文章梗概,培養(yǎng)學(xué)生綜合運用語言的能力,學(xué)習用恰當?shù)挠⒄Z描述科學(xué)家的故事。這是本課的教學(xué)難點。教師可以使用完形填空的方式來幫助學(xué)生整理語篇,從而來降低難度。本課的教學(xué)重點的突破方法是:在閱讀前,讓學(xué)生初步了解得出科學(xué)觀點所需要的基本程序,從而輕松而自然地導(dǎo)入文章的閱讀;在閱讀過程中,由易到難設(shè)計快速閱讀和精讀的問題,層層推進各種閱讀活動,讓學(xué)生對閱讀內(nèi)容從整體感知到細節(jié)理解,最后深層讀懂整篇文章,同時加強閱讀策略的指導(dǎo),讓每個學(xué)生都主動參與課堂教學(xué)活動,最終達到提高閱讀能力的目的。Step 4 Post-readingGroup Activities四人小組共同合作,在老師的適當指導(dǎo)下,就以下2個問題展開討論,讓學(xué)生就所知、所學(xué)、所感和所想融入話題,然后抽若干同學(xué)代表作小組發(fā)言。1. What do you think about John Snow, and what should we learn from him?2. Cholera was 19th century disease, which two diseases are similar to cholera today? Why?

今天我們來介紹一下必修五第四單元的授課方式。這個單元的題目是Making the news。應(yīng)該是學(xué)生比較感興趣的話題,學(xué)生往往對新聞工作充滿好奇,所以我們可以利用這個機會多設(shè)計一些師生互動和學(xué)生互動,來激發(fā)起學(xué)習的積極性,提高學(xué)習效率。同時我們可以利用這個單元不僅幫助學(xué)生掌握語言知識,培養(yǎng)語言能力,同時讓其了解新聞工作的重要性,培養(yǎng)起社會智能感。這個單元分為六個課時,它的教學(xué)目標是這樣的:語言目標是掌握詞匯表中的常用單詞和短語,掌握倒裝句的一些基本用法。 技能目標是能初步掌握約會的基本句型并在真實的場景下正確運用。新聞報道類文章的寫作技能。采訪的基本規(guī)范和溝通技能。情感目標是對新聞報道的客觀性和真實性有更好的理解。對新聞記者的職業(yè)有更深入的了解,并能體會其工作的重要性。下面我們來介紹一下第一課時的授課方式,第一課的教學(xué)目標是這樣的第一課時的教學(xué)目標語言目標:單詞:Occupation, journalist, editor, photographer, curious, personality, enthusiasm

Teaching Aims:Knowledge 1. Get the students to learn the useful new words and expressions in this section. Aims:2. Let the students learn about how the UK was formed and the four groups of invaders.1. Develop students’ reading ability and let them learn different Ability reading skills. Aims:2. Enable students to learn to talk about the United Kingdom and the Union Jack Emotional 1. Let students know more about the UK2. Develop students’ sense of cooperative learning Aims:Teaching Important Points:1. Let the students learn about the countries of the United Kingdom and the Union Jack2. Get the students to read the passage and know about how the UK was formed and the four groups of invaders.3. Have the students learn different reading skills.Teaching Difficult Ponts:1. Develop students’ reading ability.2. Enable students to talk about the United Kingdom and the Union Jack.3. Let students learn how the UK was formed geographically and historically.Teaching Methods:Showing pictures, asking, exercising, listening, reading etc.Teaching Aids:A computer,a projector and a blackboard.Teaching Procedures: 1) Show a map of the world, ask students the following questions:Where is the UK?What’s the full name of the UK?2) Ask the students work in pairs to do the quiz on Page 9.Do you want to test how many things you know about the United Kingdom? Let’s have a small test.Using the map on P9, students answer the following questions:?How many countries does the UK consist of? What are they??England is divided into three main areas. Do you know what they are? 1) Scanning (10Minutes )Let the students hold the questions asked in pre-reading and read the passagequickly and then let them do the following exercise.Join lines to the right answer.

3、清代的“閉關(guān)鎖國”政策:(1)原因:①根本原因:自給自足的封建自然經(jīng)濟;②客觀原因:西方殖民者向東方殖民擴張;③直接原因:對付東南沿海人民的抗清斗爭(2)內(nèi)容:嚴格限制對外貿(mào)易。但并不是禁絕海外貿(mào)易??滴跬砥?,禁止商人前往南洋貿(mào)易;乾隆時只開廣州一處通商,并設(shè)立政府特許的貿(mào)易機構(gòu)廣州“十三行”統(tǒng)一經(jīng)營管理對外貿(mào)易。(3)后果:①閉關(guān)鎖國政策妨礙了海外市場的開拓,抑制了資本的原始積累,從而阻礙了資本主義萌芽的發(fā)展。②閉關(guān)鎖國政策隔絕了中國與外界的聯(lián)系,從而阻斷了中國學(xué)習西方的先進科學(xué)技術(shù),阻礙了生產(chǎn)力發(fā)展,使中國落后于世界潮流。③“閉關(guān)鎖國”政策在一定程度上也保護了國家的安全。教師可以設(shè)置問題:17-18世紀中國顯露出哪些危機?

1、教材的地位作用本課是新人教版普通高中歷史必修Ⅱ第六單元第18課的內(nèi)容,闡述羅斯福新政的背景、措施、影響。從單元知識安排看,本課與第17課《空前嚴重的資本主義世界經(jīng)濟危機》、19課《戰(zhàn)后資本主義的新變化》共同詮釋第六單元課題——《資本主義世界經(jīng)濟政策的調(diào)整》。說明了“資本主義經(jīng)濟理論和政策隨著資本主義發(fā)展而不斷調(diào)整的特點”,凸顯了“市場調(diào)節(jié)”和“國家干預(yù)”在經(jīng)濟發(fā)展中的重要性。從知識體系看,它是學(xué)生學(xué)習了第一次工業(yè)革命后自由資本主義、第二次工業(yè)革命后的壟斷資本主義等之后出現(xiàn)的,既是對上述知識的鞏固與綜合運用,又為學(xué)生學(xué)習必修二的相關(guān)內(nèi)容打下基礎(chǔ),有承上啟下的作用。本課三個子目從邏輯上看又是遞進關(guān)系。第一個子目“臨危受命”承上啟下,說明了羅斯福上臺的歷史背景具有臨危受命的特點,第二個子目“實施新政”講述了羅斯福新政的主要內(nèi)容,第三個子目“擺托危機困境”主要講述了羅斯福新政的影響。

一、導(dǎo)入新課人類社會越來越現(xiàn)代化,新科學(xué)技術(shù)日新月異,令人目不暇接,稱之到了“知識爆炸”的時代也毫不為過。由此而來的是生活的快節(jié)奏,學(xué)習和工作的競爭也越來越激烈。這種競爭一直波及到了兒童,加之中國幾千年來形成的望子成龍的傳統(tǒng)觀念,使作父母的把一切希望都寄托在孩子身上,實現(xiàn)自己未能實現(xiàn)的理想。祖孫三代4、2、1的局面,使12只眼睛都盯在了孩子身上,真是走路怕摔著,吃飯怕噎著,干活怕累著,要星星不敢摘月亮,要吃什么跑遍全城也要買來。這種過分保護、溺愛及過早地灌輸知識會得到什么結(jié)果呢?樂觀者說孩子越來越聰明,越來越早熟,將來能更好適應(yīng)現(xiàn)代化的要求;悲觀者則認為豆芽菜式的孩子將來經(jīng)不起風浪,小皇帝太多了很難凝聚成統(tǒng)一力量,將來誰去當兵,誰去干那些艱苦創(chuàng)業(yè)性工作……。對孩子本身來說,是幸福還是……在此不想多發(fā)議論,還是讓我們來看看動物世界的孩子們吧,也許會得到某種啟迪。

二、學(xué)情分析:學(xué)生目前對形變和彈力有一定的感性認識但是不夠深入;知道支持力、壓力都是彈力,但是不能夠概括產(chǎn)生的原因。理性思維還沒有達到一定的層次,要想理解彈力這一抽象概念還有一定困難。因此我采取引導(dǎo)、啟發(fā)的教學(xué)方式。

一、說教材【教材分析】本節(jié)課源于人教版必修二第一章第二節(jié)人口的空間變化,該節(jié)主要分為兩部分:人口的遷移和影響因素,對于這兩部分教材的處理很簡單,課標要求為:根據(jù)資料說出人口分布的特點;而考試對于特點這方面也較重視,在本章的內(nèi)容中這節(jié)算次重點,是基于第一節(jié)人口的數(shù)量變化的基礎(chǔ)上講訴的,進而結(jié)合教材和課標制定如下教學(xué)目標?!窘虒W(xué)目標】知識與技能:了解人口遷移的內(nèi)涵,能夠根據(jù)有關(guān)資料說出國際和我國人口遷移的特點;掌握影響人口遷移的因素,能夠分析一地人口遷移的原因,解決實際問題。過程與方法:通過圖表的展示總結(jié)歸納國際國內(nèi)人口遷移的特點,培養(yǎng)學(xué)生讀圖分析,索取所需信息的能力;通過活動探究人口遷移的影響因素,理論聯(lián)系實際。情感態(tài)度與價值觀:培養(yǎng)熱愛祖國熱愛家鄉(xiāng)的情感;學(xué)會尊重他人不要對移民產(chǎn)生歧視,人人平等的情感?!窘虒W(xué)重點】人口遷移分布的特點

1.導(dǎo)入新課:用觸目精心的一首MTV《EARTHSONG》導(dǎo)入新課,引出人類已經(jīng)面臨嚴峻的人口、資源與環(huán)境的危機。而中國是世界上人口最龐大的國家,人口、資源與環(huán)境問題更加嚴重。既然我們知道了可持續(xù)發(fā)展的概況,了解了它的發(fā)展過程,從上節(jié)課內(nèi)容的分析中,也理解了作為人類的發(fā)展,可持續(xù)是唯一的選擇,也是我們所追求的目標,那么,具體到我們國家、我們周圍的生產(chǎn)、生活情況又該如何呢?2.新課講授:首先,通過三則補充材料的案例和課本上的內(nèi)容分別說明龐大的人口壓力,資源短缺和不合理利用,深刻的環(huán)境危機方面的問題,得出走可持續(xù)發(fā)展之路是我國的必然的唯一的選擇。接著通過《中國21世紀議程》——中國21世紀人口環(huán)境與發(fā)展的白皮書的過渡引出實施可持續(xù)發(fā)展的途徑。在這部分內(nèi)容的講解上,主要通過其中一種主要途徑-循環(huán)經(jīng)濟的講解,特別是對清潔生產(chǎn)和生態(tài)農(nóng)業(yè)的具體分析,總結(jié)出中國走可持續(xù)發(fā)展之路事在必行,行必有果。再通過完成課本上最后一個活動題對本節(jié)內(nèi)容進行深化。

②內(nèi)燃機的發(fā)明推動了交通運輸領(lǐng)域的革新。19世紀末,新型的交通工具——汽車出現(xiàn)了。1885年,德國人卡爾·本茨成功地制成了第一輛用汽油內(nèi)燃機驅(qū)動的汽車。1896年,美國人亨利·福特制造出他的第一輛四輪汽車。與此同時,許多國家都開始建立汽車工業(yè)。隨后,以內(nèi)燃機為動力的內(nèi)燃機車、遠洋輪船、飛機等也不斷涌現(xiàn)出來。1903年,美國人萊特兄弟制造的飛機試飛成功,實現(xiàn)了人類翱翔天空的夢想,預(yù)告了交通運輸新紀元的到來。③內(nèi)燃機的發(fā)明推動了石油開采業(yè)的發(fā)展和石油化學(xué)工業(yè)的產(chǎn)生。石油也像電力一樣成為一種極為重要的新能源。1870年,全世界開采的石油只有80萬噸,到1900年猛增至2 000萬噸。(3)化學(xué)工業(yè)的發(fā)展:①無機化學(xué)工業(yè):用化學(xué)反應(yīng)的方式開始從煤焦油中提煉氨、笨、等,用化學(xué)合成的方式,美國人發(fā)明了塑料,法國人發(fā)明了纖維,瑞典人發(fā)明了炸藥等。

四、穩(wěn)態(tài)的重要意義 為什么內(nèi)環(huán)境穩(wěn)態(tài)失調(diào)后,會對機體造成危害?引導(dǎo)學(xué)生從細胞代謝需要的物質(zhì)和條件進行分析,最后總結(jié)出:內(nèi)環(huán)境穩(wěn)態(tài)是機體進行正常生命活動的必要條件。如何預(yù)防內(nèi)環(huán)境穩(wěn)態(tài)失調(diào)、保持機體健康?引導(dǎo)學(xué)生從外界環(huán)境和機體自身調(diào)節(jié)能力兩個方面去思考。即通過加強自我保健,減少外界環(huán)境變化對機體的不良影響,同時增強機體的調(diào)節(jié)能力以適應(yīng)多變的外界環(huán)境。具體如何做?學(xué)生討論,總結(jié)。1.保護我們的生存環(huán)境,防治環(huán)境污染。2.加強體育鍛煉,增強體質(zhì),提高機體適應(yīng)外界環(huán)境的能力。3.加強自我保健,為機體保持健康創(chuàng)造有利條件。尤其是處于比較惡劣的工作環(huán)境中的人,更應(yīng)注意自身保健,如邊防戰(zhàn)士注意保暖、煉鋼工人注意降溫、抗洪戰(zhàn)士注意補充水鹽等。了解這些知識后才能懂得如何關(guān)愛自身和他人。

3、總結(jié)(這部分要5分鐘)學(xué)生在教師的提示和問題的引導(dǎo)下,完成對本節(jié)課的知識的歸納和小結(jié)。利用簡煉、清晰的語言,再一次的突出本節(jié)課的重點,起到畫龍點睛的作用,培養(yǎng)了學(xué)生的表達能力。4、鞏固練習(這部分要10分鐘)用大屏幕投影把題目投影在屏幕上,讓學(xué)生思考,然后回答。這部分安排10分鐘的時間,讓學(xué)生思考完成具有針對性的練習,進行知識鞏固和教學(xué)效果反饋,及時糾正錯誤的理解和片面的認識。5、板書設(shè)計在板書中,我根據(jù)板書的“規(guī)范、工整和美觀”的要求,結(jié)合所學(xué)的內(nèi)容,設(shè)計了如圖所示的板書。在其中,注重了重、難點的突出,使學(xué)生對知識的結(jié)構(gòu)、層次、重點、難點一目了然,便于記憶和理解。四、效果分析對于反射的判斷,學(xué)生仍有可能出現(xiàn)錯誤,如刺激坐骨神經(jīng)肌肉的收縮,教師應(yīng)強調(diào)沒有完整的反射弧結(jié)構(gòu)參與的不是反射。

強調(diào)重力對生長素分布的影響,為下面的內(nèi)容講解做鋪墊,明確植物出現(xiàn)向光性與生長素分布不均有關(guān)。復(fù)習舊知識,產(chǎn)生首因效應(yīng),鞏固和加強記憶。通過植物向光性是生長素分布較多而促進生長,進而提出“對于植物來說,生長素是不是越多越好”這個問題,引發(fā)思考,鍛煉思維。說明生長素濃度對不同器官產(chǎn)生的影響不同,讓學(xué)生對這一情況有一個整體印象。結(jié)合數(shù)學(xué)知識逐步分析圖上各點和各曲線的含義,引導(dǎo)學(xué)生得出不同器官對生長素濃度的敏感性順序,為解釋橫放植物“S”型生長做鋪墊。通過對曲線的分析,得出低生長素濃度起促進作用,高濃度有抑制作用這種雙重性,并得出其雙重性表現(xiàn)。通過以上的分析和總結(jié),對橫放植物“S”型生長進行解釋,達到首尾呼應(yīng)的效果。采用“蒙太奇”手法,引申到“太空中,橫放植物將會如何生長”這個問題,引發(fā)學(xué)生的聯(lián)想和思考,以這種提問方式結(jié)課為下節(jié)課的開課做了鋪墊,掌握了主動權(quán)。
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