资源简介 (共78张PPT)新课标 九年级上册Unit 1Section B2a-2eHow can we become good learners?学 习 目 标Objectives 1. 学习本课时新单词、短语及句式: 单词:born,ability, create, brain, active, attention, connect, knowledge, lifelong, wisely 短语:be born with, pay attention to, connect…with… 句式:But whether or not you can do this well depends on your learning habits.2. 能谈论一些好的学习习惯;3. 学会怎样成为一名成功的学习者。bornbe born withabilitycreatebrainactiveattentionpay attention tov. 出生;adj. 天生的 天生具有n. 能力;才能v. 创造;创建n. 大脑adj. 活跃的;积极的n. 注意;关注 注意;关注New wordLet's read together!connectconnect...withovernightreviewknowledgelifelongwiselyv. (使)连接;与...有联系把...和...连接或联系起来adv. 一夜之间;在夜间v. & n. 回顾;复习n. 知识;学问adj. 终身的;毕生的adv. 明智地;聪明地New wordLet's read together! 视 频How do you study English?watching English movies.asking the teacher for help.enjoying English songs.reading English magazinesmaking word cards.- How do you study English?- I study English by ... Revision Ask and answerEveryone is born with the ability to learn.listenlisteningearDo you often listen to the tape and practice your listening ?Lead-insay talk speakreadaskanswerrepeat mouthvocabularyspeakingpronunciationDo you read aloud to practice pronunciation?lookseewatchcheckpronunciationeyeDo you often watch English TV to improve your spoken English?spoken EnglishvocabularytranslatematchwritecopynumbergrammarwritinghandDo you often keep a diary to improve your writing?Do you think English is difficult or easy? Why?How do you learn to learn English well?Do you have any good learning habits?Everyone is born with the ability to learn. But whether or not you can do this well depends on your learning habits. Discussionlistening to music while learning What's their learning habit?Is the habit good or bad? Why?Look and thinklooking up in a dictionary when meeting new words What's their learning habit?Is the habit good or bad? Why?Look and thinkcopying others' homework What's their learning habit?Is the habit good or bad? Why?Look and thinktaking notes while listening What's their learning habit?Is the habit good or bad? Why?Look and thinkasking the teacher for help What's their learning habit?Is the habit good or bad? Why?Look and thinkWhat good learning habits can you think of ?Make a list and discuss them with your partner.Pre-reading Being attentive in class. Having an interest in class. Preview what you’ll learn before a lesson. Reviewing what has learned after each lesson. Asking questions in class. Having a study partner.2an. 搭档;同伴Look at the picture and title and tell us what you think of.Asking qestion during or after class activelyPrediction Some good learning habits from successful learners________ an interest in what they learnThey often _______ what they need to learn with something interesting. This way they will not get _______.Practicing and learning from mistakesPractice makes _______. They _____ practicing what they have learned. They are not ______ of making mistakes, and they learn from their mistakes. ___________ their study skillsThey have the best way to study, such as taking _____ and looking for ways to _______ . Asking questions__________ comes from questioning. They often ask questions ________or after class.boredkeep Developing notes duringListen and fill in the blanks.Creating connect afraidperfectreviewKnowledgeEveryone is born with the ______ to learn. But _______ or not you can do this well depends on your learing habits. Research shows that successful learners have some good habits in _________.abilitywhethercommonLearning is a lifelong _________ because every day brings something new. Everything that you learn becomes a part of you and _______ you, so learn ______ and learn well.journeychangeswiselyListeningRead the passage quickly and check if any of the habits you listed in 2a are mentioned. Which four habits of successful learners can you find from the passage?1. What does the passage talk about?2. Which four habits of successful learners can you find from the passage?The passage talks about good learning habits.Creating an interest in what you learn; Practicing and learning from mistakes;Developing their study skills;Asking questionsFast reading1Read subtitles, the first sentence and the last sentence of each paragraph, then complete the table.2habits proofs(证明,证据) Creating an interest in what they learn Practicing and learning from mistakes Developing their study skills Asking questions If you're interested in sth., your brain is more active andit is also easier for you to pay attention to it for a long time.Use it or lose it.It is not enough to just study hard.Knowledge comes from questioning.Fast readingMatch the detailed information with their subtitles. Write correct numbers in the blanks.(1) Creating an interesting in what they learn(2) Practicing and learning from mistakes(3) Developing their study skills(4) Asking questionsGood learners often connect what they need to learn with something interesting. ________Good learners know the best way they can study. _______Good learners often ask questions during or after class. _______Good learners will keep practicing what they have learned, and they are not afraid of making mistakes. _______(1)(3)(4)(2)Careful readingHere are some successful learners'behaviors. Which habits do they have? Write correct numbers in the blanks.(1) Creating an interesting in what they learn(2) Practicing and learning from mistakes(3) Developing their study skills(4) Asking questionsAlexander Graham Bell did not invent the telephone over night. He succeeded by trying many times and learning from his mistakes. _______If they need to learn English and they like music or sports, they can listen to English songs or watch sports programs in English. ______(2)(1)*They may take notes by writing down key words or by drawing mind maps. *They also look for ways to review what they have learned. They may do this by reading their notes every day or by explaining the information to another student. _______(3)They even ask each other and try to find out the answers. _______(4)Careful readingRead the passage and find the words in 2d ,then guess the meanings of them. If necessary, look them up in the dictionary.e.g. brain: A good way to train the brain is to do some math exercises every day.using dictionaries 使用词典这可以帮你找到与文中词的语境相匹配的定义。阅读策略2. I cannot connect the two things in my mind. 3. We stayed overnight with my mother.4. He was waving his arms to draw their attention.5. The next day we reviewed the previous day's work.6. They successfully communicate their knowledge to others.7. I have confidence in the ability of the players. 8. His daughter was very active and noisy in the mornings.9. He never behaves honestly, nor wisely. 1. A good way to train the brain is to do some math exercises every day.Make sentencesCareful reading1. Does the writer think that everyone is born with the ability to learn well? Do you agree? Why or why not?Read the passage again and answer the questions.No, he doesn’t. Yes, I do. Because whether or not one can learn well depends on his/her learning habits. Read Para 1 and answer the question.2c2. Why is it a good idea to connect something you need to learn with something you are interested in?Studies show that if you are interested in something, your brain is more active and it is also easier for you to pay attention to it for a long time. You will also not get bored. Read Para 2 and answer the question.Read the passage again and answer the questions.2cCareful reading3. What do the sayings “Use it or lose it” and “Practice makes perfect” mean? Do you agree with them?Use it or lose it: If you stop doing something, you will forget how to do it.Practice makes perfect: If you do something again and again, you will become very good at it.Yes, I do. Read Para 3 and answer the question.Read the passage again and answer the questions.Careful reading2c4. Do good learners learn from mistakes, or are they afraid of making mistakes?Good learners learn from their mistakes, and they are not afraid of making mistakes. Read Para 3 and answer the question.Read the passage again and answer the questions.Careful reading2c5. What study skills does the writer talk about? Do you have those study skills?1. Take notes by writing down key words 2. Take notes by drawing mind maps.3. Look for ways to review what has been learnt. ① review by reading the notes every day . ② review by explaining the information to another student. Yes. /No.Read Para 4 and answer the question.Read the passage again and answer the questions.Careful reading2c6. Do you agree that learning is a lifelong journey? Why or why not?Yes. Learning is a lifelong journey because every day brings something new. Read Para 5 and answer the question.Read the passage again and answer the questions.Careful reading2cLearning is a lifelong journey because every day brings something new.Read Para 5 again and translate the sentences.Everything that you learn becomes a part of you and changes you, so learn wisely and learn well.Knowledge comes from questioning.Read the passage again and answer the questions.Careful reading2cDo you think you are a good learner? What learning habits do you think are useful? Discuss with your group and share your ideas with the class.Group discussionSome sentence for giving opinions:I think…I feel…I believe…It is important to…How Can You Become a Successful Learner? Everyone is born with the ability to learn. But whether or not you can do this well depends on your learning habits. Research shows that successful learners have some good habits in common.天生具有能否依靠;依赖共同地n. 能力;才能每个人天生都具有学习的能力。在…方面有共同之处v. 出生 adj. 天生的1. Everyone is born with the ability to learn. But whether or not you can do this well depends on your learning habits. (1) Be born 意为“天生,出生”, 为被动语态 。 be born with “天生具有”, E.g. I was born in a small village. 我出生在一个小山村。 He was born to succeed in life. 他生来注定会成功。Language points(2) ability 在此处为不可数名词,意为“能力”,常构 成短语 have the ability to do sth. ( 有能力做某事) Man has the ability to speak. 人类有说话的能力。(3) 在此whether用来引导主语从句,不能与if 替换。 whether or not 意为“是否,不管,无论如何”,单个主 语从句作主语时,谓语动词用单数形式。 Whether he will come or not is unknown. 他是否会来还不知道。 Language points whether和 if 的区别: whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用。如: I wonder if / whether I can get some advice from you. 但在有些情况下,whether和if的用法有一定区别。 1. whether引导的从句常可以与or not直接连用,而if一般不能。2. 当宾语从句提到句首时,只能用whether引导, 而不能用if。如: 3. whether可以引导带to的不定式,if 则不能。4. whether及其引导的成分可作介词的宾语,但if不能。5. whether可以引导主语、表语或同位语从句,而 if不能。 Language points(4) depend on 意为“依靠, 依赖; 视…而定; 取决于” 。 后接名词,代词或动名词。既不能用于进行时态,也不能用于被动语态。 Children depend on their parents for food and clothing. 小孩依赖他们的父母供给衣食。 It all depend on whether she like the boss or not. 一切都取决于她喜欢还是不喜欢这个老板。 depend on还有 “相信; 信赖 ”之意。 Jane is a person to be depended upon. Susan can depend on their arriving here safely.Language points2. successful learners have some good habits in common. 成功的学习者有一些共同的良好习惯。 have sth. in common (with sb./ sth.) (与某人、某物有相同之处) in common 意为“共同的,共有的” 有很多相同之处可以说: have much /a lot in common 有一些共同之处可以说: have something in common 没什么共同之处可以说: have little /nothing in commonLanguage points Creating an interest in what they learnStudies show that if you are interested in something, your brain is more active and it is also easier for you to pay attention to it for a long time. Good learners often connect what they need to learn with something interesting. For example, if they need to learn English and they like music or sports, they can listen to English songs or watch sports programs in English. This way they will not get bored.n. 大脑adj. 活跃的;积极的注意;关注v. (使)连接感到无聊 v. 创造;创建学习中创造兴趣优秀学生通常把兴趣和学习内容联系起来。3. creating an interest in what they learn . 激发他们对所学内容的兴趣 create an interest in ... 对......创建兴趣 take an interest in ... 对......产生兴趣 get interested in ... 对......感到兴趣 have an interest in ... 对......有兴趣 show an interest in ... 对......表现出兴趣 be/become interested in .... 对......感兴趣 lose interest in ... 对......失掉兴趣” Language points4. Studies show that if you are interested in something, your brain is more active and it is also easier for you to pay attention to it for a long time. 研究表明如果你对某件事感兴趣,你的大脑就更活跃,你也更容易长时间专注这件事。1)本句是一个复合句,含有由that 引导的宾语从句, that是引导词。2)brain为可数名词,意为“大脑”。 Language points3)active adj. “活跃的, 积极的” 可作表语或定语。 常用短语:take an active part in ... “积极参加...” Although he is over 80, he is still very active. 他虽然年过八十,但是仍很活跃。 We all take an active part in the sports meeting. 我们都积极参加运动会。 activity为名词,意为“活动”。 actively为副词,意为“积极地;活跃地”。Language points4)pay attention to... 意为“注意,关注” , 其中to为介词, 其 后可接名词、代词、动词-ing形式或名词性从句。 We must pay attention to ways and means. 我们必须注意方式方法。(名词) When you see a silent dog, you must pay more attention to it. 当你看到一条不叫的狗,你更要注意它。(代词) Pay attention to doing more exercise. 注意多锻炼。(动名词) You should pay attention to what he has said. 你要注意他所说的事情。(宾语从句)Language pointsbe halfway to pay attention to 注意 be / get / become used to 习惯于 according to 根据 look forward to 盼望 hold on to 抓住;固守 devote oneself to献身于 contribute to 为…作贡献 put one’s mind to全神贯注于 prefer… to…更喜欢 be equal to 胜任 thanks to 多亏了;由于 get down to 着手做 lead to 导致 stick to, 坚持 object to反对;不喜欢;不赞成 make contributions to对…作贡献 be addicted to 沉溺于…,对…上瘾 apply oneself to 专心于 take to 喜欢to为介词的短语有:Language points5. Good learners often connect what they need to learn with something they are interested in. (1) connect…with…意为“ 把…和…联系起来” Please don’t connect this person with that person. 请不要把这个人和那个人联系在一起。 connect... to... “把…连接到…上” lease connect the computer to internet. 把电脑连到因特网上 其名词形式为connection,意为“连接;关系”Language points(2) need 在此处为及物动词,意为“需要” 其后跟名词、代词、动词不定式或动词-ing形式。need作实义动词时,既可用于肯定句,也可用于否定句和疑问句,构成否定和疑问句时要借助助动词do/ does/ did. You need to take good care of your mother. 你要好好照顾你妈妈。Language points Practicing and learning from mistakesGood learners think about what they are good at and what they need to practice more. Remember, “use it or lose it.” Even if you learn something well, you will forget it unless you use it. “Practice makes perfect. ”Good learners will keep practicing what they have learned, and they are not afraid of making mistakes. Alexander Graham Bell did not invent the telephone overnight. He succeeded by trying many times and learning from his mistakes.擅长…即使 = even though熟能生巧be afraid of doing sth.害怕做某事adv. 一夜之间;在夜间 不用就作废6. Good learners think about what they are good at and what they need to practice more.(1) think about 意为“考虑”, 其后接名词、代词、动词-ing形式或宾语从句。 They are thinking about a serious problem. 他们正在考虑一个严肃的问题。(2) be good at “擅长”= do well in “在某方面做得好” He is good at English. = He does well in English.Language points7. Even if you learn something well, you will forget it unless you use it.1)Even if 意为“即使,尽管”,用于引导让步状语从句,有退一步设想的意味,相当于“even though”, 不能与but连用。 I’ll help you, even if I must stay up the whole night. 即使熬夜一整晚我也要帮助你。2) forget 后直接跟名词、代词、动词不定式或动词 -ing形式。Language points区别: forget to do sth 和forget doing sth. 两者意义完全不同。 forget to do sth “忘记去做某事” forget doing sth. “忘记做过某事”e.g. I forget to turn off the light. 我忘记关灯了。 I forget turning off the light. 我忘记已经关灯了。Language points3)unless pron. “除非,如果不” 引导条件状语从句,含有否定意义,相当于if ...not. 若主句为一般将来时, unless引导的条件状语从句要用一般现在时表示将来。例:I shall go to the supermarket unless it rains. = I shall go to the supermarket if it doesn’t rain. 如果不下雨,我就会去超市。 You will never achieve success ____ you devote yourself to your work. A. after B. if C. because D. unless DLanguage points8. Good learners will keep practicing what they have learned, and they are not afraid of making mistakes. 善于学习者将一直实践所学的,他们不害怕犯错误。 1)keep +动词ing形式,表示“一直/继续做某事”, 相当于 “keep on +动词ing形式”。 2)make mistakes动词短语, 意为 “犯错误; 出错”。Language points Developing their study skillsIt is not enough to just study hard. Good learners know the best way they can study. For example, they may take notes by writing down key words or by drawing mind maps. They also look for ways to review what they have learned. They may do this by reading their notes every day or by explaining the information to another student.画思维导图寻找v.&n. 回顾;复习发展他们的学习技巧9. It is not enough to just study hard. 仅仅努力学习是不够的。【句型剖析】 It’s+adj. +to do sth. 意为“做某事是……(怎么样的)”。句中it作形式主语, 真正的主语是句中的动词不定式“to just study hard”。 在这个句型中, 句首的it作形式主语, 真正的主语是句中的动词不定式to do sth. 。Language points【妙辨异同】It’s+adj. +for sb. +to do sth. 句中形容词描述活动特征, 如difficult, easy, hard, important等 It’s+adj. +of sb. +to do sth. 句中形容词描述不定式逻辑主语的性格、品质, 如kind, good, nice, clever, polite等 【学以致用】It is important ____ people ____ learn team spirit. A. of; of B. of; to C. for; to D. to; toLanguage points10. They may take notes by writing down key words or by drawing mind maps. 他们能通过写下关键词或画脑图来记笔记。 1)take notes 动词短语,意为“记笔记”。 2) key words 名词短语,意为“关键词”。 3)draw mind maps 动词短语,意为“画脑图”。Language points11. They also look for ways to review what they have learned. (1)look for 意为“寻找” 后跟名词或代词作宾语。 E.g. they are looking for the missing child. 他们在寻找失踪的孩子。 比较:look for, find与 find out Look for: 寻找,强调寻找的动作和过程,是有目的的寻找。 find: 找到,发现,通常指找到或发现具体的东西,也可指偶然发现某物或某种情况,强调结果。 Find out: 弄清,查明,多指通过调查、询问、研究后搞清楚、弄明白,含经过困难、曲折的意味。Language points Asking questions Good learners often ask questions during or after class. They even ask each other and try to find out the answers. Knowledge comes from questioning. Learning is a lifelong journey because every day brings something new. Everything that you learn becomes a part of you and changes you, so learn wisely and learn well.知识来源于质疑学习是一个终生的旅程adv. 明智地;聪明地……的一部分学习是一个终身过程因为每天都有新鲜事物产生。n. 知识,学问adj. 终身的12. Knowledge comes from questioning.(1) question作动词,意为“质疑;质问;提问” 。如: I just accepted what he told me. I never thought to question it. 我只是接受他告诉我的。我从没想到要去质疑什么。(2) question作动词,表示对某人或事物进行提问时,是一种十 分正式的用法,有“提问;询问;审问”的意思。如: The police questioned him for three hours before letting him go. 在放他走之前,警察审问了他三个小时。(3) question作名词,意为“问题”,是可数名词。如: Can you answer my question? 你能回答我的问题吗?Language points13. Everything that you learn becomes a part of you and changes you, so learn wisely and learn well. 你所学的每件事都会成为你的一部分并且改变你,因此明智地学,好好学。 wisely adv.明智地,聪明地。 wise adj. “聪明的;有智慧的;明智的”, 如: (1) We should get into the good habit of using our time wisely. 我们应该养成一个好习惯,明智地利用时间。(2) She has the air of a wise woman. 她有才女气质。Language points Summary1.天生具有2.取决于,依靠3.有共同之处4.注意,关注5.把…和…联系起来6.即使7.一直做某事8.害怕……9.向……学习10.熟能生巧11.知识源于质疑12.学习是一个终生的旅程 be born withdepend on have sth. in commonpay attention to connect…with…even if keep doing sth.be afraid oflearn fromPractice makes perfect.Knowledge comes from questioning.Learning is a lifelong journey.Everyone ____________ the ability to learn. But _____________ you can do this well ___________your ______________ Research shows that successful learners have some good habits __________.每个人天生都具有学习的能力。能 否依靠;依赖学习习惯共同地How Can You Become a Successful Learner?whether or not depends on in commonis born with After-readinglearning habits._______show that if you ______________something, your _____is __________ and it is also easier for you to ______________ it for a long time. Good learners often _______what they need to learn ____something they________________. For example, if they need to learn English and they like music or sports, they can listen to English songs or watch sports programs in English. This way they will not _________.激发他们对所学内容的兴趣 研究头脑更活跃注 意把...和...联系起来感到无聊Creating an interest in what they learnStudiesare interested in pay attention to get bored对……感兴趣brain more activeconnect withare interested in对...感兴趣Good learners think about what they ___________and what they need to practice more. Remember, ______________! ______ you learn something well, you will forget it_____ you use it. _______________. Good learners ___ also not ____________________. Alexander Graham Bell did not invent the telephone_________. He succeeded by trying many times and _____________ his mistakes. 擅长于…不用就作废即使 熟能生巧。害怕犯错误Practicing and learning from mistakes除非...否则...亚历山大 ? 格雷厄姆 ?贝尔Practice makes perfectare good at “use it or lose it”Even ifunlessafraid of making mistakesarelearning from从....中学习overnight一夜之间It is not enough to just study hard. You have to know how to study. Good learners _______the best ways to learn well. For example, they may________by writing down key words or by __________________. Good learners also _______ways to review what they have learned. They may do this by reading their notes every day or by explaining the information to another student.找到;发现画思维导图Developing their study skills寻找find out drawing mind mapstake notes做笔记look for 发展他们的学习技巧Good learners often ask questions during or after class. They even ask _________ and try to find out the answers. ________________________________.__________________________ because every day brings _____________. Everything that you learn becomes _______you and changes you, so _________ and learn well.互相;彼此知识来源于质疑。学习是一个终生的旅程……的一部分Asking questionsKnowledge comes from questioninglearn wisely明智地学习something new新的东西each otherLearning is a life-long journeya part ofFree talkDo you have any learning habits? How do you study English?enjoy English songs. keep a diary in English .surf the Internet. do grammar exercises.take notes carefully. finish my homework seriously.memorize sentence patterns use an English dictionaryA good way of learning won’t make us get bored and help become a successful learner.1. 注意;关注2. 即使3. 天生具有4. 取决于5. 犯错误b. pay attention to d. even?thoughe. make mistakesa. be born with…c. depend on ExerciseExercise单项选择1. - A research suggests that walking helps people live longer. - I quite agree, but it ____ when and how they walk. A. keeps on B. decides on C. moves on D. depends on2. We haven’t decided or not to go to the cinema. A. If B. whether C. what D. weather3. In summer, food will go bad quickly we put it into a fridge. A. if B. unless C. as soon as D. while4. You will still miss the flight _____ you catch a Didi car. A. even if B. as if C. until D. before5. It’s not very easy for Li Lei maths well. A. learn B. learning C. to learn D. learnsDBBACExerciseExercise6. If one is ____ in something, his or her brain is more active. A. interest B. interesting C. interested D. interests7. You can connect what you need to learn ____ something interesting while learning a language. A. to B. with C. from D. of8. Don’t be afraid of making mistakes. Just keep ____ what you’ve learned. A. practice B. practiced C. practicing D. to practice9. Thomas Edison invented the light bulb ____ trying again and again. A. by B. with C. in D. from10. ______is important ______ English well. A. That; learn B. That; learning C. It; learn D. It; to learnCBCADExerciseExercise用所给词的适当形式填空1.?Jack ______ (?wise)?decided to?tell?us?the?truth.2.?We??should keep _________ (practice)pronouncing new?words after?class3. Students can improve their English by _________ (review) notes.4.?Knowledge comes from ___________ (question).5.?Teachers should encourage students to take an _____?(?act) part in discussions in class.practicingreviewingquestioningactivewiselyExerciseExercise根据句意,用方框中所给单词的正确形式填空填空。 1. Enough sleep can make sure our ______ work better.2. Try to ______ an interest in what you learn. 3. They can get a lot of scientific __________ from such an interesting activity.4. My mother is my first teacher and my________ teacher. create, knowledge, brain, lifelong knowledgelifelongcreatebrainsExerciseExerciseⅣ. 根据汉语意思完成英语句子,每空一词。 1. 张老师叫我注意拼写。 Mr. Zhang told me to ____ ________ ___my spelling. 2. 这条铁路把北京和上海连接了起来。 The railway ________ Beijing _____ Shanghai.3.这两种文化有很多相同之处。 The two cultures ____ a lot __ __________.4. 熟能生巧。为了学好英语,你需要大量的练习。 ________ ______ ________. To learn English well, you need a lot of practice.pay attention toconnects withhave in commonPractice makes perfect ExerciseExercise5. 昨天卡萝尔要求给她时间考虑一下那件事。 Yesterday Carol asked for time to _____ ______ it.6. 劳拉天生具有跳舞的能力。 Laura ___ ____ ____ the ability to dance.7.你记下老师刚才说的内容了吗? Have you _______ ______ what the teacher said just now.8. 你是否成功常常取决于你努力的程度。 Whether____ ____ you can succeed usually _______ ____ how hard you work. think aboutis born withwritten downor notdepends onExerciseExerciseHomework1. Write a sentence for each word in the box. 2. Write a letter telling a friend how to become a better language learner.brain n. connect v. overnight adv.attention n. review v. knowledge n.ability n. active adj. wisely adv.谢谢21世纪教育网(www.21cnjy.com) 中小学教育资源网站 有大把高质量资料?一线教师?一线教研员?欢迎加入21世纪教育网教师合作团队!!月薪过万不是梦!!详情请看:https://www.21cnjy.com/help/help_extract.php 展开更多...... 收起↑ 资源列表 B.2b.mp3 人教版九年级Unit1HowcanwebecomegoodlearnersSectionB(2a-2e).pptx 课堂导入.mp4