Welcome Unit （复习课件）英语人教版必修第一册

该高中英语单元复习课件系统梳理了Welcome Unit的重点词汇、核心短语句型、单元语法（句子成分与五种基本句型）及主题写作（推介信），通过知识图谱构建词汇-语法-写作的知识网络，结合考点串讲（词汇精讲、词形转换、句型分析）和即时训练，帮助学生形成逻辑清晰的知识体系。 其亮点在于采用“基础巩固-能力提升-综合应用”的分层复习策略，如单句语法填空强化高频考点，语篇填空训练语境应用，主题写作提供模板与范文培养语言表达能力和逻辑思维品质。这种设计既满足不同学生需求，又助力教师精准把握学情，有效提升复习效率。

人教版·必修第一册 Welcome Unit 单元复习 Unit 1 Teenage Life 复习目标 知识图谱 考点串讲 单元语法 主题写作 综合训练 复习目标 知识图谱 考点串讲 单元语法 主题写作 综合训练 CONTNETS 1.学生能够掌握本单元重点词汇，如exchange, design, annoyed, anxious,impression, explore ,confidence,organise, improve等,并能在不同语境中正确运用。（重点掌握） 2. 学会重要短语和句型,如leave ...alone, look forward to, What if ...?, sb find＋it＋宾补＋to do ...等，并能利用这些短语和句型进行口头和书面表达。（重点掌握） 3. 提高阅读理解能力，能够读懂关于高中校园生活，自我成长等主题的文章，理解文章主旨大意、细节信息，并能根据文章内容进行推理判断。​ 4. 培养书面表达能力，能够运用所学词汇、短语和句型，写一篇推介信，做到语言表达准确、条理清晰、内容完整。​ 复习目标 知识图谱 find+宾语+宾补...... 名词短语、形容词和副词短语 单元语法 what if...? 2. 表达推荐常用句式 3. 必背短文模板 主题写作 1.推介信开头常用句式 exchange impress 重点单词 curious leave...alone on purpose 重点短语 concentate on join in... look forward to... Welcome Unit Welcome Unit 考点串讲 人教版·必修第一册 考点串讲 重点词汇 单词 词形 意思 vi./n./vt. （开）讲座；讲课/讲座；讲课；教训/训斥 adj. 级别（或地位）高的；年长的 adj. 地位（或职位、级别）低下的；年轻的 n. 目标；球门；射门；进球得分 n./vt. 做搭档；/合作 n. 公司；商行；陪伴 adj. 外向的；爱交际的 n. 性格；个性 adj. 好奇的；求知欲强的 n. 方式；作风 lecture senior junior goal partner company outgoing personality curious style 考点串讲 词形转换 1. exchange n.交换；兑换；交流；争论 /vt.交换；交流；交易；兑换 →exchangeable adj.可交换/易的；可兑换的 2. nation n.国家；民族；国民→national adj.国家的；民族的 →nationality n.国籍；民族 3. designer n.设计者→design vt.设计；筹划 n.设计；设计方案 4. formal adj.正式的；正规的→informal adj.非正式的；不正规的 →formalise/-ize vt.使成为正式的；使定形 5. anxious adj.焦虑的；不安的→anxiously adv.焦虑地→anxiety n.焦虑 考点串讲 词形转换 6. annoyed adj.恼怒的；生气的→annoy vt.使恼怒；打扰→annoying adj.令人恼怒的→annoyance n.恼怒 7. nation n.国家；民族；国民→national adj.国家的；民族的 →nationality n.国籍；民族 8. frightened adj.惊吓的；害怕的→frightening adj.令人害怕的 →frighten vt. & vi.（使）害怕；（使）惊恐→fright n.恐惧；惊吓 9. impression n.印象；感想→impress vt.使钦佩；给……留下深刻的 好印象 vi.留下印象；引人注目→impressive adj.令人印象深刻的 5. concentrate vi. & vt.集中（注意力/ vt.（使）浓缩 n.浓缩物 →concentration n.集中；专心；浓度，含量 →concentrated adj.集中的；全力以赴的；浓缩的 考点串讲 词形转换 11. explore vt. & vi.探索；勘探→explorer n.探索者；勘探者 →exploration n.探索；勘探；探究 12. confident adj.自信的；有把握的→confidently adv.自信地；有把 握地→confidence n.信心；信任；秘密，机密 13. organise vt.组织；筹备；安排；组建vi.组建；成立→organiser n. 组织者→organisation n.组织；团体；机构→organised adj.有条理 的；有组织的→disorganised adj.杂乱无章的 14. improve vi. & vt.改进；改善→improved adj.已改善的；有改进的 →improvement n.改善；改进（处） 15. revise vt. & vi.修改；修订；复习→revision n.复习；修正 考点串讲 词汇精讲 1. exchange n.交换；交流 vt.交换；交流；交易；兑换 情景导学 Having exchanged our phone numbers, I boarded the bus and gave a huge wave to him. 我们交换了电话号码后，我上了车，向他使劲儿挥了挥手。 用法归纳 ①in exchange for ...　　作为对……的交换 ②exchange A for B　　用A来换取B ③exchange sth with sb　　和某人交换某物 词汇拓展 exchangeable adj.可交换/易的；可兑换的 即时训练 微写作： ①最近，学生们就如何在课外学好英语相互交换看法，其结果下。 Recently，students ⁠ beyond the classroom and the results are as follows. ②我们交换了电话号码后，我上了车，向他使劲儿挥了挥手。　 _____________________________________ ，I boarded the bus and gave a huge wave to him. have exchanged ideas with each other about how to learn English well　 Having exchanged our phone numbers　 考点串讲 词汇精讲 2. design n.设计；设计方案 vt.设计；筹划 情景导学 The teacher arranged the group activities by design,aiming to improve the students’ teamwork skills.　（活动介绍）老师有意安排了小组活动，旨在提高学生的团队合作能力。 用法归纳 ①be designed for ...　　　为……而设计 ②be designed to do ...　　目的是做…… ③by design　　故意 词汇拓展 designer n.　　设计者 联想 表示“故意与偶然”的其他词语 故意：①on purpose　　②deliberately 偶然：①by chance　　②by accident 即时训练 单句语法填空 ① （2025·八省联考）The documentary focuses on animals and is designed the abandoned animals in local animal shelters. for　 ②Career Planning is a newly added column （design） to help us get a better understanding of the job market. designed　 考点串讲 词汇精讲 3. anxious adj.焦虑的；不安的；渴望的 情景导学 Learning that you are anxious to know about China’s development achievements，I am writing to tell you some information.　 得知你渴望了解中国取得的发展成就，我写这封信来告诉你一些相关信息。 用法归纳 ①be anxious about/for　　为……担心/担忧 ②be anxious to do sth　　渴望做某事 ③with anxiety　　焦虑地 词汇拓展 ①anxiety n. 担心；焦虑；渴望 ②anxiously adv.　焦虑地 即时训练 单句语法填空 ①I am anxious some students’studies because they are addicted to shooting short videos and neglect learning. for/about　 微写作 ②天色渐暗，他感到一阵不安（焦虑心理描写） As the sky gradually darkened， ⁠. ③我如坐针毡，焦急地等待着写作比赛的结果。 I was waiting for the result of the writing contest ⁠ ⁠. a wave of anxiety seized him　 anxiously/with anxiety as if I were sitting on pins and needles　 考点串讲 词汇精讲 4. annoy vt.使恼怒；打扰 情景导学 Besides， in the library， certain students talk aloud， disturbing others， which annoys me. 此外，在图书馆，某些学生大声说话，打扰其他人，这令我厌烦。 用法归纳 ①What annoys/annoyed sb most is/was that ...　最让某人生气的是…… ②It annoys/annoyed sb that ...　　使某人生气是…… ③be annoyed with sb　　对某人感到生气 词汇拓展 ① annoyed adj.　　生气的； 恼怒的 ②annoying adj.　　使人不高兴的 ③annoyance n.　　烦恼；烦人的事物 in annoyance　　生气地 即时训练 单句语法填空 ①Sally is with the children about making ⁠ noise， slamming her fist on the table in .（annoy） annoyed　 annoying　 annoyance　 微写作 ②我们经常看到空荡荡的教室里灯和风扇还开着，看到学生们使用一 次性杯子和塑料瓶，这让我们很气愤。　（2024·天津卷） we often see lights and fans left on in empty classrooms，and students using disposable cups and plastic bottles. It annoys us that/What annoys us is that　 考点串讲 词汇精讲 5. impress vt.使钦佩；给……留下深刻的好印象 vi.留下印象；引人注目 情景导学 What impressed me most was the sunlight reflecting off the lake and the gentle breeze. 湖面反射的阳光，和煦的微风让我印象最深刻。 用法归纳 ①be impressed with/at/by ... 对……印象深刻 ②impress sth on sb/impress sb withsth) 使某人牢记某事 ③What impressed sb most was .../that ...让某人印象最深刻的是……　 ④leave/have/make a（n） ...impression on sb　　给某人留下……的印象 词汇拓展 ① impression n.　　印象；感想 ②impressive adj.　　给人深刻印象的；令人赞叹的 即时训练 单句语法填空 ①So fantastic are the paintings that I （impress） by the talent of the painters as well as the charm of traditional Chinese culture. am impressed　 ②Since setting out on the journey， the fitness lover has not only managed to grow an （impress） set of muscles， but also a huge following on social media. impressive　 微写作 ③千言万语不如一个小善行。　（主旨升华） A thousand words will not as an act of kindness. leave so deep an impression　 考点串讲 词汇精讲 6. concentrate vi. & vt.集中（注意力）；聚精会神 情景导学 Anxious and nervous， I had no choice but to concentrate on/upon designing our project with him.　（紧张焦虑描写）尽管焦虑又紧张，我别无选择，只好集中精力和他一起设计我们的项目。 用法归纳 ①concentrate on/upon （doing） sth　集中精力于（做）某事 ②concentrate one’s attention/efforts on/upon （doing） sth　专注于（做）某事 词汇拓展 ①concentration n.　　专心；专注；集中；浓度 ②concentrated adj.　　集中的；浓缩的；全神贯注的 即时训练 单句语法填空 ①Second， it can improve your focus and （concentrate）， making it easier to stay engaged in class. ②She made a （concentrate） effort to finish the project on time， and as a result， she was praised by her boss. concentration　 concentrated　 微写作 ③她坐在窗边，全神贯注地盯着那张纸，努力在晚饭前完成作业。　（动作链描写） She sat by the window and the page， trying to finish her homework before dinner. concentrated her attention on/upon　 考点串讲 词汇精讲 7. confident adj.自信的；有把握的 情景导学 Over time， I became more confident and even started creating my own patterns.　 随着时间的推移，我变得更加自信，甚至开始创作我自己的图案。 用法归纳 ①be confident about/of （doing） sth　　对（做）某事有信心 ②have confidence in　　对……有信心 ③with confidence　　自信地 词汇拓展 ①confidence n.　　信心；信任 ②confidently adv.　　自信地 即时训练 单句语法填空 ①Because of your continual help， I not only improved my pronunciation but also became more confident my English.　（感谢信） ②This experience gave her a new sense of （confident） in her abilities and laid a solid foundation for her to face other challenges in the future. about　 confidence　 微写作 ③我深呼吸，平静下来，满怀信心地走上舞台。　（动作＋心理描写） →Breathing deeply， I calmed down and ⁠ ⁠. walked on stage with cofidence 考点串讲 词汇精讲 8. curious adj.好奇的；求知欲强的 情景导学 Jane turned to the boys， wide-eyed， curious to see what was going on. 简转向男孩子们，睁大了眼睛，好奇地想看看发生了什么事。 用法归纳 ①be curious about sth　　　对某事感到好奇 ②be curious to do sth　　渴望做某事 ③out of curiosity　　出于好奇 词汇拓展 ①curiosity n.　　好奇心 ②curiously adv.　　好奇地==with curiosity　　好奇地 联想 -ous结尾的形容词 ①humorous 幽默的 ②continuous 持续的 ③poisonous 有毒的 ④generous 大方的 ⑤ridiculous 可笑的 即时训练 单句语法填空 ①I’m glad you’re curious how Chinese students use AI for self-study on weekends.　（咨询信） about　 ②（2023·浙江卷）We not only gained recreation and relevant knowledge about the natural world but we all explored our surroundings with （curious）.　 curiosity　 微写作 ③出于好奇，我问他为什么突然改变计划，希望了解背后的原因。　（心理描写） ， I asked him about his sudden change of plans， hoping to know the reason behind it. Out of curiosity　 考点串讲 句型精讲 Sentence 1 译文：我发现我的大多数同学和老师都很友好而且乐于助人。 I found most of my classmates and teachers friendly and helpful. 句型公式：“find＋宾语＋宾语补足语”结构 知识总结 （1）find＋宾语＋ （2）find＋it＋形容词/名词＋to do ...中，it是形式宾语，to do ... 是真正的宾语。 即时训练 微写作 ①当艾米丽发现父母微笑的眼睛注视着她时，她松了一口气。　（动作描写） Emily breathed a sigh of relief when ⁠ her. ②我发觉我的儿子沉迷网络游戏，这使我怒不可遏。　（愤怒描写） I ，which made me boil with anger. ③由于方向感差，伊娃发现自己不可能在这么大的楼里四处走动。（2024·6月浙江卷） Having a poor sense of direction， Eva ⁠ in such a huge building. finding her parents’ smiling eyes focused on　 found my son addicted to online games　 found it impossible to get around 考点串讲 句型精讲 Sentence 2 知识总结 What if ...？ 要是......会怎样/怎么办呢？ 即时训练 What if no one talks to me？　要是没人和我说话怎么办呢？ 微写作 一想到要离开他们，我就满是恐惧。如果其中一个摔倒了怎么办？如果他们俩一起摔倒了又怎么办？　 The thought of leaving them fills me with fear. ⁠ ？ ⁠？ What if one of them falls over What if they both have a fall together　 Unit 1 Teenage Life 单元语法 人教版·必修第一册 宾 主 宾补、主补 谓 表 同 定 状 八种句子成分 基本成分 修饰成分 单元语法 基本句型一：Ｓ+ Ｖ+ Ｐ （主＋系＋表） You are my sunshine. 基本句型二：Ｓ+Ｖ （主＋谓） She smiled. 基本句型三： Ｓ+ Ｖ+ Ｏ （主＋谓＋宾） I love/hate you. She smiled at me. 基本句型四： I love/hate you. She smiled at me. His father bought him a cake. 基本句型五： Ｓ+Ｖ+ Ｏ+ C （主＋谓＋间宾＋宾补） We call President Xi Xidada. 英语五种基本句型： 人 物 系动词 不及物动词，无被动语态 1. 及物动词 2. 不及物动词+介词 单元语法： 练习：判断下列句子的句型并翻译句子 He smiled. Her dream has come true. This video made me sad. Tired and sleepy, I went to bed. All the tourists seemed happy. She is in good health. SV SV SVOC SVOC SVP SVP 宾语补足语 主语补足语 32 练习：判断下列句子的句型并翻译 Someone left you this note. She always keeps her room clean. I live in Beijing. My brother has become a famous writer. I want a cup of coffee. We elected him president. SVOO SVOC SVA SVP SVO SVOC 33 Welcome Unit 主题写作 人教版·必修第一册 应用文增分练——英语报增设栏目的推介信 　　（2025·全国一卷）假定你是李华，你班的英语报要增设一个栏 目。外教 Jenny 提出“Fun at my school”和“Guess who I am”两个选 项供大家选择。请给Jenny写一封邮件，内容包括： 　　（1）你的选择； 　　（2）说明理由。 高中总复习·英语（人教版） 目 录 思维建模・脉络梳理 考点一：文体特征与适用场景规范 知识点 1：文体核心属性与写作原则 建议信 & 推荐信 知识点 2：非正式场景 知识点 3：正式场景 考向破译 考向 01：正式/非正式正误辨析 考向 02：语境语气适配 建议信 推荐信 建议信规范 推荐信规范 建议信规范 推荐信规范 主题写作 主题写作 写作思路 推介信 开头段 中间段 结尾段 明确选择，推荐人或物 总述推荐对象整体特质； 搭配具体事例分点列举核心优势； 说明适配对方需求的契合点 重申推荐，表达希望 推荐的理由 写作要点 理由宽泛,不能与该栏目的特点完美契合 ①“丰富校园生活”“缓解学业压力”“提供平台”(校园活动的共性,问题在于理由 宽泛而空洞); ②“Guess who I am”可以激发好奇心(思维跳跃,逻辑不顺畅)   考场作文失分点 高分突破关键点 主题写作 主题写作 写作素材 1. 推介信开头常用句式 1）I really like the idea of adding a new column to our English newspaper. Of the two options， I strongly recommend “Fun at school”.（2025·全国一卷）我非常赞成给我们的英文报纸新增一个专栏。在这两个选项中，我强烈推荐 “校园趣事”。 2）Delighted to know that you prefer a student to give an address， I would like to offer my recommendation. 很高兴得知您想要一名学生致辞，因此我想向您推荐人选。 3）Clad to know that you are planning to add a new column to our English newspaper, I prefer “Fun at my school” of the two given options.很高兴了解到你打算为我们的英文报纸新增一个专栏,对于所给选择，我更倾向于“校园趣事”。 主题写作 写作素材 2. 建介信中间常用句式 1) To begin with， it can cover diverse topics ranging from sports events， festivals to funny incidents， which will encourage students to take part in the school activities actively.首先，这个专栏可以涵盖从体育赛事、节日庆典到趣闻轶事等多种主题，这会鼓励学生们积极参与校园活动。 2) My second recommendation is the books about traditional festivals.我要推荐的第二类书籍是关于传统节日的书籍。 3) It’s a good opportunity for students to strengthen language skills in descriptive writing and creative thinking in an interactive way.这是一个让学生通过互动方式提升描述性写作语言技能和创造性思维的好机会。 主题写作 写作素材 3. 推介信结尾常用句式 1）I hope my recommendation would be of help to you. 我希望我的建议能对你有所帮助。 2）I do hope that you can find my recommendation beneficial. Looking forward to your early/prompt reply.我确实希望我的推荐对你有帮助。期待你的早日/及时回复。 主题写作 写作模板 Dear ✕✕✕,  Very glad to hear that ________, I am writing to offer my recommendation ______. In my opinion / Personally speaking / As far as I am concerned, I highly recommend that... for the following reasons./ You would be wise to take the following actions. To begin with/ Firstly / In the first place, it can ___________. Secondly / In the second place, not only can it___________, but it also helps_____________. Besides / In addition / Furthermore, it’s a good opportunity to ______________. Consequently / In a word / In conclusion, I believe that ______________. I hope that my opinions are of help to you. / I am looking forward to your consideration about my proposals. Yours sincerely, Li Hua 主题写作 优秀范文1 Dear Jenny， 　　I really like the idea of adding a new column to our English newspaper. Having evaluated both options carefully， I strongly vote for “Guess Who I am”. 　　 The instant I saw the theme， my curiosity was aroused. It adds a touch of fun and mystery to the newspaper. Therefore， this column can significantly encourage active participation. Better yet， not only can the guessing game be both educational and entertaining， but it is also a good opportunity for students to strengthen language skills in descriptive writing and creative thinking in an interactive way. As everyone learns more about their peers， teachers， and notable figures around campus， it helps to bridge gaps and build stronger relationships on campus. 　　 Isn’t it an ideal choice？ Looking forward to hearing your thoughts. Yours sincerely， Li Hua 主题写作 优秀范文2 Dear Jenny， I really like the idea of adding a new column to our English newspaper. I recommend launching “Fun at my school.” As a student-run column, it can document wonderful moments and showcase campus vitality in classrooms, clubs, sports meets and so on. 　 By covering various activities in short features with photos and student quotes, the page serves as a pleasant diversion, thus relieving academic pressure while high-lighting students' creativity. Short, photo-rich features with student quotes make contri-butions easy and attractive, building stronger community bonds and a more relaxed atmosphere, compared to the second choice. Rotating editors and open submissions ensure voices from newcomers are welcomed and heard. 　　If possible, add a mini-series called “One day, one smile” to record small acts of kindness. I'd be happy to prepare the first issue. Yours, Li Hua 主题写作 写作练习 (2025届浙江Z20名校联盟第二次联考)假设你是李华,你校下周日有两个志愿者活 动同时举行,一个在火车站,另一个在市文化博物馆。你的交换生朋友Peter不知道选择 参加哪一个,写信向你寻求建议。请你写一封回信,内容包括: (1)给出建议; (2)说明理由。 注意: (1)写作词数应为80左右; 主题写作 写作范文 Possible version : Dear Peter, 　　Hope this letter finds you well. I'd recommend joining in the volunteer activity at the train station. 　　It offers a fantastic opportunity to interact with travelers and assist them with directions, tickets, and luggage. The bustling atmosphere is not only engaging but also enriching, offering a chance to enhance both communication and problem-solving skills. 　　While the museum activity is also meaningful, it focuses more on quieter tasks like organizing exhibits or guiding visitors. At the train station, you'll enjoy a more dynamic and hands-on experience, where your outgoing personality can truly shine as you connect with people from all walks of life. 　　Let me know if you need any more information. Yours, Li Hua Welcome Unit 综合训练 人教版·必修一第一册 综合训练 Ⅰ.单句语法填空——分层级强化高频考点 1.I shook hands and exchanged a few words 　　　　　the manager.  2.He's always __________(lecture) me about the way I dress.  3.I looked around __________(anxious),hoping that he hadn't walked away.  4.Her daughter was in the passenger seat and looked extremely confused and __________(frighten).  5.I am looking forward to __________(get) your advice on how to improve my oral English.  6.(2024全国甲卷) Dogs are known for their ___________(impress) fetching habit,but cats take this behavior up a notch.  with lecturing anxiously frightened getting impressive 综合训练 7.(2024北京卷)And when people started clapping,that gave me a boost of 　　　　　　(confident).  8.(2023全国甲卷)You’ll soon find that the more patience you practice,the more you start to apply it to other more 　　　　　　(annoy) situations.  9.(2023全国乙卷)When I work,I often concentrate so much 　　　　　what I’m doing that I may have a hard time dealing with things that come up unexpectedly.  10.(2022全国乙卷)As long as we devote ourselves to English learning,we would make great 　　　 　　(improve).  confidence annoying on improvement Ⅱ.语篇填空——语境中应用单元要点 On September 1st I entered senior high school.At first,I was a little anxious and it 1. __________ (annoy) me that I was unfamiliar with the surroundings.What 2.__________ no one would talk to me?But soon I found my teachers and classmates kind and friendly.What's more,the lessons were interesting and colourful,and all day,I made many good friends,so I didn't feel awkward or 3. __________ (frighten) at all.I concentrated my attention 4. __________ my studies.Now I feel much more relaxed and 5. __________ (confidence).I like 6. __________ (design) new club plans and I often exchange ideas with my classmates,who are very kind.The new school has made a good 7. __________ (impress) on me.As a student,I will study hard and I look forward to 8.____________________(admit) to a key university in three years' time.  annoyed if frightened on confident designing impression being admitted CONTNETS Ⅲ 高效迁移 微点练全 一词多义/熟词生义 1. lecture n.讲座；讲课；教训 vt.训斥 ①What makes me angry is that he is always lecturing me about my behavior.　 ⁠ ②（2025·全国二卷）Once in a lecture， the professor tried repeating my name after me over and over in front of thirty classmates.　 ⁠ ⁠ ③As a senior high school student， I know I must stop smoking — don’t give me a lecture about it.　 ⁠ vt.训斥　 n.讲 座；讲课　 n.教训　 2. senior adj.级别（或地位）高的；年老的 n.较年长的人；老年人， 长者；上司；高年级学生，毕业班学生 ①（2025·全国一卷）I talked to one of the senior applicants who answered questions in a way that reflected the faith she had in herself.　 ⁠ ②Last weekend， we went to the nearby nursing home to visit the seniors.　 ⁠ adj.级别（或地位）高的　 n.老年人，长者　 Ⅲ 高效迁移 微点练全 Ⅲ 高效迁移 微点练全 ③Many experts have given talks here that have focused on the medical care，and the development of public services for senior citizens.　 ⁠ ⁠ ④Last Sunday，our school held a five-kilometer cross-country running race.All students in Senior 3 took part in it.　 ⁠ ⁠ adj. 年老的　 n.高年级学生，毕业班 学生　 CONTNETS 3. He is an awkward guy who is always finding fault with others.　 ⁠ 4. I’d been standing there for several minutes before he registered my presence.　 ⁠ 5. To avoid further misunderstanding，we need a brief exchange about the matter.　 ⁠ 6. To make this happen，the airline has partnered up with MagniX to create the world’s first commercial flight with an electric engine.　 ⁠ ⁠ 7. The football player scored a goal and the team won the match.　 ⁠ ⁠ adj.难对付的　 vt.注意到　 n.会谈；交谈　 vi. 合作　 n. 进球得分　 Ⅲ 高效迁移 微点练全 人教版·选择性必修第一册 感谢聆听 $