Unit5 Developing ideas (Listening & speaking) 课件2025-2026学年外研版英语八年级下册

Developing ideas (Listening & speaking) Unit 5 Looking into nature 01 Teaching objectives 02 Lead in 03 Listening 04 Vocabulary Contents 05 Homework 01 Teaching objectives 语言能力 能听懂关于自然奥秘的听力材料，准确捕捉主旨大意、关键细节及说话者的推测语气，理解模态动词在表达可能性中的用法，提升听力理解能力。 能熟练运用本单元核心词汇（如boiling, wonder, heat等）和宾语从句，围绕自然现象的成因进行简单问答、讨论，做到表达基本流畅、语法无误。 能模仿听力语篇的语气和结构，进行角色扮演，清晰表达对自然奥秘的看法和推测，提升口头交际的准确性和连贯性。 思维品质 学习能力 文化意识 能根据听力材料中的信息，分析、归纳自然现象的可能成因，培养逻辑推理和归纳总结能力，学会梳理信息间的关联。 能结合已有知识，对听力中提到的自然奥秘提出合理质疑和补充推测，打破单一思维，培养批判性思维和多角度思考能力。 能在小组讨论中清晰地表达自己的观点，倾听同伴意见并合理回应、补充，培养思维的条理性和合作探究中的思维协作能力。 能掌握“听前预测、听中抓细节、听后复述”的听力策略，主动运用该策略完成听力任务，提升听力学习效率。 能主动积累自然探索相关的英语词汇和句型，在听说练习中发现自身不足，主动向同伴或老师请教，培养自主学习和查漏补缺的能力。 能积极参与小组合作听说活动，主动承担任务，学会分工协作、互助学习，提升合作探究和高效完成学习任务的能力。 了解中外科学家探索自然奥秘的相关事迹，感受不同文化背景下人们对自然的敬畏与探索精神，尊重多元文化中的科学探索理念。 体会中西方在表达自然探索观点时的语言差异，培养跨文化交际意识，学会用得体的英语表达对自然探索的看法。 树立尊重自然、热爱自然、主动探索自然的意识，理解不同文化中“人与自然和谐共生”的共同理念，增强文化自信。 教学重点 掌握本课时核心词汇、短语及宾语从句、模态动词的用法，能在听说语境中准确运用，确保口头表达的规范性和准确性。 能听懂关于自然奥秘的听力材料，快速捕捉主旨和关键细节，能根据听力信息完成问答、复述等任务，提升听力核心技能。 能围绕“自然奥秘及成因”进行简单的口头讨论、角色扮演，清晰地表达自己的观点和推测，实现基本的听说交际目标。 教学难点 在口头表达中灵活运用宾语从句和模态动词表达推测，避免语法错误，同时保证表达的流畅性和逻辑性，克服句式运用障碍。 听力中能准确捕捉说话者的语气和隐含信息，结合语境推断自然现象的可能成因，避免只关注表面信息而忽略深层含义。 在小组讨论中主动表达观点、回应同伴，准确运用所学语言组织思路，解决开口胆怯、表达不连贯的问题，提升口头交际能力。 教学重难点 02 Lead in 黑洞是广义相对论预言的宇宙致密天体，因其引力极强，事件视界内的逃逸速度大于光速，光也无法从中逃脱。1916 年，德国天文学家卡尔・史瓦西通过计算得出爱因斯坦场方程的真空解，提出了史瓦西半径与视界概念。1964 年，科学记者安・尤因首次将其称作 “黑洞”，后经物理学家惠勒推广。近年来观测不断取得突破：澳大利亚团队发现每日吞噬一个太阳质量的高速成长黑洞，国际团队发现孤立黑洞，中国 “天关” 卫星也捕捉到中等质量黑洞撕裂吞噬白矮星的过程。 Cultural note Bigfoot，又称 Sasquatch，即大脚野人，是流传于北美地区的神秘类人猿生物，也是神秘动物学的经典形象。传说它身高 2 至 4 米，全身覆盖浓密毛发，直立行走，因留下巨大脚印而得名。这一传说源自北美原住民文化，1958 年因巨型脚印发现被广泛传播。虽有不少目击报告与影像资料，但均缺乏可靠证据支撑。主流科学界认为大脚野人并不存在，相关记录多为误认、伪造或民间传说。如今它已成为流行文化符号，频繁出现在影视、文学作品中。 Cultural note 尼斯湖水怪是苏格兰尼斯湖的传疑生物，外形常被描述为类似蛇颈龙，至今尚无确凿证据证明其存在。相关记载最早可追溯至公元 565 年，1933 年的目击报告引发广泛关注，次年公布的经典照片后被证实为伪造。科学界提出地震气泡、巨型鳗鱼等多种解释。近年仍不时出现疑似影像记录，也推动了多次科考，2023 年开展了五十多年来最大规模搜索，2025 年有团队进行环境 DNA 研究。它被列为世界著名未解之谜，现已成为苏格兰重要文化符号，每年吸引上百万游客。 Cultural note Do you know the secrets of nature below? 蚁群智慧 Ant Colony Intelligence 潮汐节律 Tidal Rhythms 晶体生长 Crystal Formation Plant Communication 生物发光Bioluminescent Glow 云层发电 Cloud Electrification 候鸟导航 Migratory Navigation 深海热泉Deep-Sea Vents What other secrets do you know? Discuss them with your partner. 03 Listening Which of the secrets interests you most? I'm most interested in the secret of black holes. Black holes are mysterious and amazing cosmic phenomena. They have super strong gravity that can even trap light, and we still don't fully understand what's inside them. Exploring black holes helps us learn more about the origin and evolution of the universe, which makes me really curious. Pre-listening Which of the secrets interests you most? The secret of Bigfoot interests me most. Bigfoot is a legendary creature that people have reported seeing in forests for a long time, but there's no solid scientific proof of its existence. I'm fascinated by whether it's a real unknown animal or just a myth, and it's fun to think about the unknown creatures hiding in the wild. Pre-listening Which of the secrets interests you most? The secret of the Loch Ness Monster interests me most. For hundreds of years, people have talked about a huge monster living in Loch Ness in Scotland. Even though many searches have been done, we still don't know if it's real. This unsolved mystery always makes me want to find out the truth behind the stories. Pre-listening Nature is full of secrets. They are waiting to be explained. These include black holes, the beginning of the universe, the Loch Ness Monster and Bigfoot. These secrets awaken our curiosity and drive scientists to better understand the wonders around us. DID YOU KNOW 大自然充满了奥秘。这些奥秘正等待着被揭开。其中包括黑洞、宇宙的起源、尼斯湖水怪以及大脚怪。这些奥秘激发了我们的好奇心，并促使科学家们更好地去探索我们周围的世界的奇妙之处。 While-listening Listen to the talk and choose the correct topic. a A disappearing river in South America. b The life of the people in the Amazon rainforest. c A boiling river in the Amazon rainforest. 单词中的重音（1） 一个单词可以在不同的音节上被重读。如果我们把重音放在第二个音节上，这个单词通常是一个动词。例如，“present”表示时间，而“present”表示动作。 动词重音核心规律 1. 总规则：双音节单词中 作名词 / 形容词：重音多在 第一音节；作动词：重音多在 第二音节 2. 动词重音格式 重音符号 ˈ 标在重读音节前；结构：前轻后重 → 弱读 + 重读 3. 高频动词（重音都在第二音节） preˈsent v. 呈现，颁发；reˈcord v. 记录，录制；conˈduct v. 组织，实施；obˈject v. 反对；deˈsert v. 抛弃，遗弃；exˈport v. 出口；imˈport v. 进口；proˈduce v. 生产，制造；susˈpect v. 怀疑；perˈmit v. 允许 4. 一句话记忆：动词喜欢把重音放在后面。 Cultural note While-listening Listen and mark the stress. record a world record / record the temperature produce fresh produce / produce oxygen perfect a perfect gift / perfect her skills desert the biggest desert on earth / desert his duty Now listen again and repeat. /rɪˈkɔːd/ /ˈrekɔːd/ /ˈprɒdjuːs/ /prəˈdjuːs/ /ˈpɜːfɪkt/ /pəˈfekt/ /ˈdezət/ /dɪˈzɜːt/ While-listening Listen again and complete the profile. What is it? It is a boiling river as hot as 1 ℃. What do the local people do with it? They 2 with it? They clean with it. They make 3 with it. They sometimes go swimming in it, but only after 4 . What's the speaker's opinion? It's one of the most 5 of the rainforest. 86 cook tea amazing wonders heavy rain While-listening Learning to learn Listening for opinions Expressions such as I think, I believe and I guess show people's opinions. Remember: people are sharing their ideas, so you don't have to agree. But you should listen to the other person's opinions and be polite. 学会学习 倾听意见 诸如“我认为”“我相信”“我猜测”这样的表述体现了人们的观点。请记住：人们是在分享自己的想法，所以你不必认同这些观点。但你应该倾听对方的意见，并保持礼貌。 Listen again and complete the profile. While-listening Listen to the conversation and complete the table. The ancient people's idea is possible. There's much 1 . It's unlikely for the sun to 2 . that much. Perhaps the river passes a volcano and 3 . That's not the reason. The nearest volcano is about 4 away. Maybe there are some chemicals 5 . They can 6 heat. That's 7 , but scientists haven't found any yet. More 8 is needed. sunshine heat the river becomes hot 700 kilometres in the water produce possible research While-listening Learning to learn Talking about possibilities Could, may and might are used to talk about possibilities. Words such as maybe and perhaps are used, too. We can also use the structure It's certain / likely / possible that... 学会学习 谈论可能性 “能够”“可能”和“也许”这些词用于谈论可能性。诸如“或许”和“大概”这样的词也会被使用。我们还可以使用“它必定会/很可能/可能……”这样的结构。 Listen to the conversation and complete the table. Cultural note How to talk about possibilities. 一、核心功能 To talk about possibilities means to express how likely something is to happen or be true.（谈论可能性，就是表达一件事发生或为真的概率大小。） 二、用情态动词表达可能性 1. must — 一定，肯定（可能性极高） Used when you are almost sure something is true. 例句：He must be ill. 他一定生病了。 2. may /might/could — 可能，也许（中等可能性） Used when you think something is possible but you are not sure. Cultural note 例句：It may rain this afternoon. 今天下午可能下雨。 3. can — 有时会，可能（多用于理论 / 普遍可能） 例句：It can get very cold here in winter. 这里冬天可能会很冷。 （否定：can't — 不可能） 三、用副词表达可能性 1. probably — 很可能，大概（可能性较高） Usually goes before the main verb or after be 动词. 例句：He will probably win. 他可能会赢。 2. maybe /perhaps — 也许，或许（语气较弱，常放句首） 例句：Maybe he is right. 或许他是对的。 Cultural note 四、常用句型结构 1. It is certain that … 必定会…… 例句：It is certain that he will pass the exam. 他必定会通过考试。 2. It is likely that … 很可能…… 例句：It is likely that they will win the game. 很可能他们会赢得这场比赛。 3. It is possible that … 有可能…… 例句：It is possible that she will be late. 有可能她会迟到。 4. There is a chance that … 有机会 / 有可能…… 例句：There is a chance that we will finish early. 有可能我们会提前完成任务。 五、可能性从高到低排序 must / certain 一定 probably / likely 很可能 may / might / could 可能 maybe / perhaps 也许 can't / impossible 不可能 六、易混点小结 can：表示 “理论上可能” may/might：表示 “实际可能发生” must：表示 “非常确定的推测” can't：表示 “完全不可能” Post-listening Work in pairs. Choose one unsolved secret of nature and talk about possible explanations. Post-listening Work in pairs. Choose one unsolved secret of nature and talk about possible explanations. Useful expressions The truth may be... It's likely that... Perhaps it's because... It's probably a result of... There's a (strong) possibility that... It's possible that... There's a chance that... Sample 1: Crop Circles Have you heard of crop circles? Yes, it's very strange. I'm curious about the possible reasons. Perhaps it's because some people make them as a prank. The truth may be that most are man-made, but there's a possibility that a few are natural phenomena. It's likely that wind and weather patterns create simple ones, while complex ones are human works. It's possible that we'll never know for sure all the origins. Have you heard of the underwater ancient city off the coast of Greece? Yes, it's very strange. I'm curious about the possible reasons. Perhaps it's because of a huge earthquake that sank the city thousands of years ago. It's probably a result of sea level rise after the last ice age. Sample 2: Underwater Ancient Cities There's a strong possibility that natural disasters caused the city to submerge. There's a chance that the city was built on a fault line, making it vulnerable to sinking. 04 Vocabulary boiling /ˈbɔɪlɪŋ/ adj. 很热的，滚烫的 例句：It's boiling hot today. 今天热得要命。 boiling point 沸点 例句：Water reaches its boiling point at 100℃. 水在 100 摄氏度达到沸点。 boiling water 沸水，开水 例句：Don't touch the boiling water. 别碰开水。 boil /bɔɪl/v. 沸腾；煮沸 例句：Please boil some water. 请烧点开水。 boiled /bɔɪld/adj. 煮沸的，煮熟的 例句：I like boiled eggs for breakfast. 我早餐喜欢吃煮鸡蛋。 boiler /ˈbɔɪlə(r)/n. 锅炉；热水器 例句：The boiler is broken. 热水器坏了。 chemical /ˈkemɪkl/ n. 化学品 例句：These chemicals are harmful to the environment. 这些化学品对环境有害。 chemical reaction 化学反应 例句：Burning is a kind of chemical reaction. 燃烧是一种化学反应。 chemistry /ˈkemɪstri/n. 化学 例句：I am very interested in chemistry. 我对化学很感兴趣。 chemist /ˈkemɪst/n. 化学家；药剂师 例句：His dream is to become a famous chemist. 他的梦想是成为一名著名的化学家。 chemically /ˈkemɪkli/adv. 化学地 例句：The two substances are chemically different. 这两种物质在化学性质上不同。 05 Homework Complete the after-class exercises. Preparing for the next writing class. Reflect on what you have learned about the secrets of nature from this section. See you in the next class! $