證明:過(guò)點(diǎn)A作AF∥DE,交BC于點(diǎn)F.∵AE=AD,∴∠E=∠ADE.∵AF∥DE,∴∠E=∠BAF,∠FAC=∠ADE.∴∠BAF=∠FAC.又∵AB=AC,∴AF⊥BC.∵AF∥DE,∴DE⊥BC.方法總結(jié):利用等腰三角形“三線合一”得出結(jié)論時(shí),先必須已知一個(gè)條件,這個(gè)條件可以是等腰三角形底邊上的高,可以是底邊上的中線,也可以是頂角的平分線.解題時(shí),一般要用到其中的兩條線互相重合.三、板書(shū)設(shè)計(jì)1.全等三角形的判定和性質(zhì)2.等腰三角形的性質(zhì):等邊對(duì)等角3.三線合一:在等腰三角形的底邊上的高、中線、頂角的平分線中,只要知道其中一個(gè)條件,就能得出另外的兩個(gè)結(jié)論.本節(jié)課由于采用了動(dòng)手操作以及討論交流等教學(xué)方法,有效地增強(qiáng)了學(xué)生的感性認(rèn)識(shí),提高了學(xué)生對(duì)新知識(shí)的理解與感悟,因而本節(jié)課的教學(xué)效果較好,學(xué)生對(duì)所學(xué)的新知識(shí)掌握較好,達(dá)到了教學(xué)的目的.不足之處是少數(shù)學(xué)生對(duì)等腰三角形的“三線合一”性質(zhì)理解不透徹,還需要在今后的教學(xué)和作業(yè)中進(jìn)一步鞏固和提高
活動(dòng)準(zhǔn)備:1.了解隨地吐痰不僅會(huì)污染生活環(huán)境,而且還會(huì)危害身體健康?! D片(小朋友隨地吐痰) 2.請(qǐng)小朋友回家向爸爸、媽媽咨詢有關(guān)痰和病菌傳播的危害。 活動(dòng)過(guò)程:1.出示圖片,引導(dǎo)幼兒觀察: ▲圖上的小朋友在干什么?這樣做對(duì)嗎?為什么? ▲使幼兒明白:我們不能隨地吐痰,隨地吐痰是不文明、不衛(wèi)生的行為。 2.教師引導(dǎo)幼兒參與討論: ▲在我們的痰里面,有什么? ▲你知道痰里面的病菌是怎樣傳播的? 鼓勵(lì)幼兒大膽地談?wù)勌祩鞑ゼ膊〉耐緩?。 ?.教師小結(jié):生病的病人身體內(nèi)有很多的病菌,吐出的痰里也村有許多的病菌,這些闥如果被人踩了,就把細(xì)菌帶到了各個(gè)地方;這些痰被太陽(yáng)曬干了,痰里的病菌會(huì)跑道空氣中,就會(huì)被吸入我們的身體內(nèi),傳播各種病菌,危害人體的健康。
教學(xué)目標(biāo):1、使學(xué)生了解什么是毒品,毒品的種類,認(rèn)識(shí)吸毒行為,認(rèn)清毒品的危害性。2、通過(guò)圖文、吸毒而造成的悲慘事件,教育學(xué)生自覺(jué)遠(yuǎn)離毒品,提高拒毒防毒意識(shí)和能力。3、讓學(xué)生認(rèn)識(shí)吸毒成癮的途徑;認(rèn)識(shí)吸毒成癮的原因,如何預(yù)防。懂得“珍愛(ài)生命,拒絕毒品”,培養(yǎng)禁毒意識(shí),遵紀(jì)守法,抵制毒品,增強(qiáng)與毒品違法犯罪作斗爭(zhēng)的自覺(jué)性。教學(xué)重點(diǎn):知道什么是毒品,吸毒的危害,如何提高抵制毒品的能力。
教學(xué)準(zhǔn)備 1. 教學(xué)目標(biāo) 知識(shí)與技能掌握雙曲線的定義,掌握雙曲線的四種標(biāo)準(zhǔn)方程形式及其對(duì)應(yīng)的焦點(diǎn)、準(zhǔn)線.過(guò)程與方法掌握對(duì)雙曲線標(biāo)準(zhǔn)方程的推導(dǎo),進(jìn)一步理解求曲線方程的方法——坐標(biāo)法.通過(guò)本節(jié)課的學(xué)習(xí),提高學(xué)生觀察、類比、分析和概括的能力.情感、態(tài)度與價(jià)值觀通過(guò)本節(jié)的學(xué)習(xí),體驗(yàn)研究解析幾何的基本思想,感受圓錐曲線在刻畫現(xiàn)實(shí)和解決實(shí)際問(wèn)題中的作用,進(jìn)一步體會(huì)數(shù)形結(jié)合的思想.2. 教學(xué)重點(diǎn)/難點(diǎn) 教學(xué)重點(diǎn)雙曲線的定義及焦點(diǎn)及雙曲線標(biāo)準(zhǔn)方程.教學(xué)難點(diǎn)在推導(dǎo)雙曲線標(biāo)準(zhǔn)方程的過(guò)程中,如何選擇適當(dāng)?shù)淖鴺?biāo)系. 3. 教學(xué)用具 多媒體4. 標(biāo)簽
本人所教的兩個(gè)班級(jí)學(xué)生普遍存在著數(shù)學(xué)科基礎(chǔ)知識(shí)較為薄弱,計(jì)算能力較差,綜合能力不強(qiáng),對(duì)數(shù)學(xué)學(xué)習(xí)有一定的困難。在課堂上的主體作用的體現(xiàn)不是太充分,但是他們能意識(shí)到自己的不足,對(duì)數(shù)學(xué)課的學(xué)習(xí)興趣高,積極性強(qiáng)。 學(xué)生在學(xué)習(xí)交往上表現(xiàn)為個(gè)別化學(xué)習(xí),課堂上較為依賴?yán)蠋煹囊龑?dǎo)。學(xué)生的群體性小組交流能力與協(xié)同討論學(xué)習(xí)的能力不強(qiáng),對(duì)學(xué)習(xí)資源和知識(shí)信息的獲取、加工、處理和綜合的能力較低。在教學(xué)中盡量分析細(xì)致,減少跨度較大的環(huán)節(jié),對(duì)重要的推導(dǎo)過(guò)程采用板書(shū)方式逐步進(jìn)行,力求讓絕大多數(shù)學(xué)生接受。 1.理解橢圓標(biāo)準(zhǔn)方程的推導(dǎo);掌握橢圓的標(biāo)準(zhǔn)方程;會(huì)根據(jù)條件求橢圓的標(biāo)準(zhǔn)方程,會(huì)根據(jù)橢圓的標(biāo)準(zhǔn)方程求焦點(diǎn)坐標(biāo). 2.通過(guò)橢圓圖形的研究和標(biāo)準(zhǔn)方程的討論,使學(xué)生掌握橢圓的幾何性質(zhì),能正確地畫出橢圓的圖形,并了解橢圓的一些實(shí)際應(yīng)用。 1.讓學(xué)生經(jīng)歷橢圓標(biāo)準(zhǔn)方程的推導(dǎo)過(guò)程,進(jìn)一步掌握求曲線方程的一般方法,體會(huì)數(shù)形結(jié)合等數(shù)學(xué)思想;培養(yǎng)學(xué)生運(yùn)用類比、聯(lián)想等方法提出問(wèn)題. 2.培養(yǎng)學(xué)生運(yùn)用數(shù)形結(jié)合的思想,進(jìn)一步掌握利用方程研究曲線的基本方法,通過(guò)與橢圓幾何性質(zhì)的對(duì)比來(lái)提高學(xué)生聯(lián)想、類比、歸納的能力,解決一些實(shí)際問(wèn)題。 1.通過(guò)具體的情境感知研究橢圓標(biāo)準(zhǔn)方程的必要性和實(shí)際意義;體會(huì)數(shù)學(xué)的對(duì)稱美、簡(jiǎn)潔美,培養(yǎng)學(xué)生的審美情趣,形成學(xué)習(xí)數(shù)學(xué)知識(shí)的積極態(tài)度. 2.進(jìn)一步理解并掌握代數(shù)知識(shí)在解析幾何運(yùn)算中的作用,提高解方程組和計(jì)算能力,通過(guò)“數(shù)”研究“形”,說(shuō)明“數(shù)”與“形”存在矛盾的統(tǒng)一體中,通過(guò)“數(shù)”的變化研究“形”的本質(zhì)。幫助學(xué)生建立勇于探索創(chuàng)新的精神和克服困難的信心。
《奇偶性》內(nèi)容選自人教版A版第一冊(cè)第三章第三節(jié)第二課時(shí);函數(shù)奇偶性是研究函數(shù)的一個(gè)重要策略,因此奇偶性成為函數(shù)的重要性質(zhì)之一,它的研究也為今后指對(duì)函數(shù)、冪函數(shù)、三角函數(shù)的性質(zhì)等后續(xù)內(nèi)容的深入起著鋪墊的作用.課程目標(biāo)1、理解函數(shù)的奇偶性及其幾何意義;2、學(xué)會(huì)運(yùn)用函數(shù)圖象理解和研究函數(shù)的性質(zhì);3、學(xué)會(huì)判斷函數(shù)的奇偶性.?dāng)?shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象:用數(shù)學(xué)語(yǔ)言表示函數(shù)奇偶性;2.邏輯推理:證明函數(shù)奇偶性;3.數(shù)學(xué)運(yùn)算:運(yùn)用函數(shù)奇偶性求參數(shù);4.數(shù)據(jù)分析:利用圖像求奇偶函數(shù);5.數(shù)學(xué)建模:在具體問(wèn)題情境中,運(yùn)用數(shù)形結(jié)合思想,利用奇偶性解決實(shí)際問(wèn)題。重點(diǎn):函數(shù)奇偶性概念的形成和函數(shù)奇偶性的判斷;難點(diǎn):函數(shù)奇偶性概念的探究與理解.教學(xué)方法:以學(xué)生為主體,采用誘思探究式教學(xué),精講多練。
Activity 41. Students complete the task of activity 4, then teachers and students check the answers. 2. The teacher organized the students to work together and asked them to use the tables and mind maps sorted out before to retold the important choices in Lin Qiaozhi's life and their resultsStep 5 Language points1. The teacher asks the students to read the text carefully, find out the core 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(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)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(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生能否結(jié)合文本特點(diǎn)總結(jié)林巧稚的人生原則和人格品質(zhì)特征;3、通過(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生能否針對(duì)人生抉擇發(fā)表自己的看法;能否全面地、客觀地、理性地看待問(wèn)題,進(jìn)而對(duì)道德和人性有更加深入的思考和理解。
(2) students are divided into groups according to the requirements of activity 3. Each student shares a story of personal experience or hearing-witnessing kindness, and then selects the most touching story in the group and shares it with the whole class. Before the students share the story, the teacher can instruct them to use the words and sentence patterns in the box to express. For example, the words in the box can be classified:Time order: first of all, then, after that, later, finally logical relationship :so, however, although, butTeachers can also appropriately add some transitional language to enrich students' expression:Afterwards, afterwards, at last, in the end, eventuallySpatial order: next to, far from, on the left, in front ofOtherwise, nevertheless, as a result, therefore, furthermore, in addition, as well asSummary: in a word, in short, on the whole, to sum up, in briefStep 8 Homework1. Understand the definition of "moral dilemma" and establish a correct moral view;2. Accumulate vocabulary about attitudes and emotions in listening texts and use them to express your own views;3. Complete relevant exercises in the guide plan.1、通過(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生能否理解理解“道德困境”的定義;2、通過(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生能否通過(guò)說(shuō)話人所表達(dá)的內(nèi)容、說(shuō)話的語(yǔ)氣、語(yǔ)調(diào)等來(lái)判斷其態(tài)度和情緒;3、通過(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生能否針對(duì)具體的道德困境發(fā)表自己的看法和見(jiàn)解,能否掌握聽(tīng)力理訓(xùn)練中的聽(tīng)力策略。
The price is the same as(the price was)before the war.價(jià)格與戰(zhàn)前相同。(4)定語(yǔ)從句中的“關(guān)系代詞+助動(dòng)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(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生是否理解和掌握省略的用法;2、通過(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生能否根據(jù)上下文語(yǔ)境或情景恢復(fù)句子中省略的成分,體會(huì)使用省略的效果;3、通過(guò)本節(jié)內(nèi)容學(xué)習(xí),學(xué)生能否獨(dú)立完成練習(xí)冊(cè)和導(dǎo)學(xué)案中的相關(guān)練習(xí)。
該板塊的活動(dòng)主題是“介紹一個(gè)有顯著文化特征的地方”( Describe a place with distinctive cultural identity)。該板塊通過(guò)介紹中國(guó)城繼續(xù)聚焦中國(guó)文化。本單元主題圖呈現(xiàn)的是舊金山中國(guó)城的典型景象, Reading and Thinking部分也提到中國(guó)城,為該板塊作鋪墊。介紹中國(guó)城的目的主要是體現(xiàn)中國(guó)文化與美國(guó)多元文化的關(guān)系,它是美國(guó)多元文化的重要組成部分。中國(guó)城也是海外華人的精神家園和傳播中國(guó)文化的重要窗口,外國(guó)人在中國(guó)城能近距離體驗(yàn)中國(guó)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.
The activity theme of this section is to design various activities around the key words in the first text. Therefore, the activities require students to pay attention to the spelling of words. On the other hand, let students grasp the meaning of words more accurately through sentences and short texts. This kind of teaching design also helps to improve the ability of using English thinking.1. Cultivating students' ability to use word formation to induce and memorize vocabulary, and the ability to use lexical chunks to express meaning.2. Guide the students to think independently and use the correct form of words to complete sentences3. Cultivate students' habit of using lexical chunks to express language completely, guide students to draw words in sentences quickly, pay attention to word collocation, so as to accumulate more authentic expressions4. Instruct students to create sentences with the chunks.1. Enable students to use the language points in the real situation or specific contexts flexibly and appropriately.2. Guiding the Ss to use unit topic words and the sentence patterns in a richer context.Step1: Think of a word that best fits each definition.1. to remember sth2.to accept, admit, or recognize sth or the truth/existence of sth3. the process of changing sth or yourself to suit a new situation4 .to make sb feel less worried or unhappy5. a strong desire to achieve sth
The theme of this part is to write an article about healthy diet. Through reading and writing activities, students can accumulate knowledge about healthy diet, deepen their understanding of the theme of healthy diet, and reflect on their own eating habits. This text describes the basic principles of healthy diet. The author uses data analysis, definition, comparison, examples and other methods. It also provides a demonstration of the use of conjunctions, which provides important information reference for students to complete the next collaborative task, writing skills, vivid language materials and expressions.1. Teach Ss to learn and skillfully use the new words learned from the text.2. Develop students’ ability to understand, extract and summarize information.3. Guide students to understand the theme of healthy diet and reflect on their own eating habits.4. To guide students to analyze and understand the reading discourse from the aspects of theme content, writing structure, language expression, etc., 5. Enable Ss to write in combination with relevant topics and opinions, and to talk about their eating habits.1. Guide students to analyze and understand the reading discourse from the aspects of theme content, writing structure, language expression, etc.2. Enable them to write in combination with relevant topics and opinions, and to talk about their eating habits.3. Guide the students to use the cohesive words correctly, strengthen the textual cohesion, and make the expression fluent and the thinking clear.Step1: Warming upbrainstorm some healthy eating habits.1.Eat slowly.2.Don’t eat too much fat or sugar.3.Eat healthy food.4.Have a balanced diet.Step2: Read the passage and then sum up the main idea of each paragraph.
This section guides students to pay attention to the typical context of vocabulary use, helps students accumulate vocabulary around the key vocabulary of this unit, and uses the learned words and word chunks in different contexts to deeply understand their meaning and usage, so as to achieve the purpose of review and consolidation.The teaching design activities aim to guide students to pay attention to the typical context in which the target vocabulary is used, as well as the common vocabulary used in collocation, so that students can complete the sentence with correct words. In terms of vocabulary learning strategies, this unit focuses on cultivating students' ability to pay attention to collocation of words and to use word blocks to express meaning.For vocabulary learning, it is not enough just to know the meaning of a single word, but the most important thing is to master the common collocations of words, namely word blocks.Teachers should timely guide students to summarize common vocabulary collocation, such as verb and noun collocation, verb and preposition collocation, preposition and noun collocation, and so on.1. Guide students to understand and consolidate the meaning and usage of the vocabulary in the context, 2. Guide the students to use the unit topic vocabulary in a richer context3. Let the students sort out and accumulate the accumulated vocabulary, establishes the semantic connection between the vocabulary,4. Enable students to understand and master the vocabulary more effectivelyGuiding the Ss to use unit topic words and the sentence patterns in a richer context.
The theme of this section is to learn how to make emergency calls. Students should learn how to make emergency calls not only in China, but also in foreign countries in English, so that they can be prepared for future situations outside the home.The emergency telephone number is a vital hotline, which should be the most clear, rapid and effective communication with the acute operator.This section helps students to understand the emergency calls in some countries and the precautions for making emergency calls. Through the study of this section, students can accumulate common expressions and sentence patterns in this context. 1.Help students accumulate emergency telephone numbers in different countries and learn more about first aid2.Guide the students to understand the contents and instructions of the telephone, grasp the characteristics of the emergency telephone and the requirements of the emergency telephone.3.Guide students to understand the first aid instructions of the operators.4.Enable Ss to make simulated emergency calls with their partners in the language they have learned1. Instruct students to grasp the key information and important details of the dialogue.2. Instruct students to conduct a similar talk on the relevant topic.Step1:Look and discuss:Match the pictures below to the medical emergencies, and then discuss the questions in groups.
《基本不等式》在人教A版高中數(shù)學(xué)第一冊(cè)第二章第2節(jié),本節(jié)課的內(nèi)容是基本不等式的形式以及推導(dǎo)和證明過(guò)程。本章一直在研究不等式的相關(guān)問(wèn)題,對(duì)于本節(jié)課的知識(shí)點(diǎn)有了很好的鋪墊作用。同時(shí)本節(jié)課的內(nèi)容也是之后基本不等式應(yīng)用的必要基礎(chǔ)。課程目標(biāo)1.掌握基本不等式的形式以及推導(dǎo)過(guò)程,會(huì)用基本不等式解決簡(jiǎn)單問(wèn)題。2.經(jīng)歷基本不等式的推導(dǎo)與證明過(guò)程,提升邏輯推理能力。3.在猜想論證的過(guò)程中,體會(huì)數(shù)學(xué)的嚴(yán)謹(jǐn)性。數(shù)學(xué)學(xué)科素養(yǎng)1.數(shù)學(xué)抽象:基本不等式的形式以及推導(dǎo)過(guò)程;2.邏輯推理:基本不等式的證明;3.數(shù)學(xué)運(yùn)算:利用基本不等式求最值;4.數(shù)據(jù)分析:利用基本不等式解決實(shí)際問(wèn)題;5.數(shù)學(xué)建模:利用函數(shù)的思想和基本不等式解決實(shí)際問(wèn)題,提升學(xué)生的邏輯推理能力。重點(diǎn):基本不等式的形成以及推導(dǎo)過(guò)程和利用基本不等式求最值;難點(diǎn):基本不等式的推導(dǎo)以及證明過(guò)程.
1、書(shū)中還有許多描寫旺達(dá)的片段,哪一處給你留下了深刻的印象呢?請(qǐng)同座位互相交流。全班交流。老師也想和大家一起分享一點(diǎn)感受。老師讀第13頁(yè)片段,并談感受。課件出示:孤單,被嘲笑者2、你有過(guò)被人嘲笑的經(jīng)歷嗎?談一談。旺達(dá)是怎樣面對(duì)同學(xué)們的嘲笑?3、轉(zhuǎn)學(xué)之后,十三班的同學(xué)們收到了她爸爸的來(lái)信。誰(shuí)愿意讀讀這封信?圣誕節(jié)來(lái)臨之際,旺達(dá)也寫來(lái)一封信。學(xué)生讀。讀完這兩封信,大家肯定感慨萬(wàn)千,一定有很多話想說(shuō)吧?全班交流課件出示:善良 寬容
一.材料 小山洞、與幼兒人數(shù)相等的動(dòng)物玩具,小貓頭飾若干,貓媽媽的胸飾一只,音樂(lè)磁帶一盒。二.過(guò)程(一)以游戲的口吻和形式導(dǎo)入活動(dòng)1.教師:“小貓們,今天媽媽帶你們到那邊森林里去玩,我們一邊唱歌一邊走吧!”(伴隨《蝴蝶花》的音樂(lè),幼兒做律動(dòng)進(jìn)入場(chǎng)景)2.教師:“草地上真舒服,小貓們和媽媽一起坐下來(lái)休息一會(huì)兒,媽媽給你們講一個(gè)故事?!保常适拢簭那埃幸恢豢蓯?ài)的小兔跟著媽媽一起到森林里去采蘑菇,它看到美麗的鮮花,漂亮的蝴碟可開(kāi)心了。它一會(huì)兒去聞聞鮮花,一會(huì)兒撲蝴蝶,結(jié)果找不著媽媽啦。天漸漸地黑了,小兔找不著媽媽多傷心呀,它大聲地喊:“媽媽,媽媽……”。
2、發(fā)展幼兒的邏輯思維能力。3、教育孩子珍惜時(shí)間,養(yǎng)成按時(shí)作息的好習(xí)慣?;顒?dòng)準(zhǔn)備:1、幼兒人手一份硬紙片鐘。2、動(dòng)物手偶3、實(shí)物鐘活動(dòng)過(guò)程:一、引入并簡(jiǎn)單認(rèn)識(shí)鐘及其作用。1、 引入并簡(jiǎn)單認(rèn)識(shí)鐘的種類及其作用。教師調(diào)鬧鐘鬧鈴引入提問(wèn):⑴你們猜猜是什么聲音?(鬧鐘的鬧鈴)⑵家里還有哪些鐘?是什么形狀的?(有鬧鐘,手表,掛鐘和大座鐘)⑶鐘有什么作用?(鐘不停的走,告訴人們幾點(diǎn)了,人們就按照時(shí)鐘上的時(shí)間進(jìn)行學(xué)習(xí)休息)2、簡(jiǎn)單認(rèn)識(shí)鐘面。教師:今天老師也帶來(lái)了一個(gè)鐘,看看它是什么形狀的?(圓形)請(qǐng)你仔細(xì)觀察鐘面上有什么?總結(jié):有兩根針和12個(gè)數(shù)字。提問(wèn):⑴這兩根針有什么不同?(長(zhǎng)度不同)教師:他們都有自己的名字,長(zhǎng)的叫分針,短的叫時(shí)針。我們?cè)诳纯磾?shù)字,提問(wèn):⑵正上面的是數(shù)字多少?(12)⑶正下面的是數(shù)字多少?(6)二、由時(shí)針、分針賽跑,引導(dǎo)幼兒感知時(shí)針、分針的運(yùn)轉(zhuǎn)規(guī)律。教師:今天呀,時(shí)針和分針要進(jìn)行依次跑步比賽,現(xiàn)在他們都摘在數(shù)字12的起跑線上了。請(qǐng)你們猜猜誰(shuí)回贏?好,比賽就要開(kāi)始了,預(yù)備— 開(kāi)始?。ń處煵僮麋姳恚┨釂?wèn):⑴誰(shuí)跑的快?(分針)議論:分針和時(shí)針跑的時(shí)候,他們之間有什么秘密呢?教師反復(fù)操作??偨Y(jié):分鐘走一圈,時(shí)鐘走一格,這就是一小時(shí)。
重點(diǎn):了解接龍游戲的規(guī)律,并能運(yùn)用比較、對(duì)應(yīng)的經(jīng)驗(yàn)合作制作接龍卡。難點(diǎn):1.孩子對(duì)前后卡片的界限區(qū)分。成因是接龍卡本身有兩小部分所組成,容易會(huì)造成孩子辨別卡片上的混淆。2.操作中的前后推理。成因是由于幼兒的逆向思維發(fā)展尚不成熟,容易被附近一個(gè)已知數(shù)所誤導(dǎo)。解決策略:1.逐步化解法:借助雙色的卡片做教具,以層層遞進(jìn)的方式從順向推理向逆向推理逐步過(guò)渡。2.資源共享法:以小組合作形式開(kāi)展操作活動(dòng),能以兵兵互教的形式化解補(bǔ)缺的難點(diǎn),達(dá)到資源共享?;顒?dòng)目標(biāo):1.了解接龍游戲的規(guī)律,并能運(yùn)用比較、對(duì)應(yīng)的經(jīng)驗(yàn)合作制作接龍卡。 2.嘗試用簡(jiǎn)潔語(yǔ)言介紹和交流自己的操作結(jié)果,能運(yùn)用以往的數(shù)學(xué)經(jīng)驗(yàn)表明意思。
教學(xué)目標(biāo):1、使學(xué)生了解什么是毒品,毒品的種類,認(rèn)識(shí)吸毒行為,認(rèn)清毒品的危害性。2、通過(guò)圖文、吸毒而造成的悲慘事件,教育學(xué)生自覺(jué)遠(yuǎn)離毒品,提高拒毒防毒意識(shí)和能力。3、讓學(xué)生認(rèn)識(shí)吸毒成癮的途徑;認(rèn)識(shí)吸毒成癮的原因,如何預(yù)防。懂得“珍愛(ài)生命,拒絕毒品”,培養(yǎng)禁毒意識(shí),遵紀(jì)守法,抵制毒品,增強(qiáng)與毒品違法犯罪作斗爭(zhēng)的自覺(jué)性。教學(xué)重點(diǎn):知道什么是毒品,吸毒的危害,如何提高抵制毒品的能力。