Unit 7 The natural world (Reading I）课件 2025-2026学年译林版英语八年级上册

该初中英语课件围绕“自然世界”主题，聚焦海洋、湿地、森林三大生态系统，通过“Think and answer”激活学生对生态系统组成及三大系统初步认知，再以“Read and predict”引导预测文章主旨，搭建从已知到未知的学习支架，帮助学生逐步把握篇章结构与核心细节。 其亮点在于以分层阅读任务（结构分析、段落匹配、细节选择）提升语言能力，结合音频听读训练夯实生态词汇；通过小组讨论“选择最重要生态系统并说明理由”培养思维品质与合作探究能力，语言点练习（如“prevent sb. from doing sth.”结合生态主题造句）强化语言运用。Summary图表化总结三大系统特征与作用，助力学生系统掌握知识，教师可借助多样化活动设计提升教学效率。

初中英语译林版八上 The natural world Reading (I) Unit 7 通过本课时的学习，学生能够： Learning objectives 通过听读纠音、语言点学习及词汇练习，夯实与生态系统相关的词汇、短语增强英语语言表达的准确性与流畅度。 02 通过分层阅读任务，准确把握篇章结构、段落主旨与核心细节，提升信息提取与概括整合能力。 01 通过小组讨论、课堂分享及课后拓展任务，培养环保认知与合作探究思维，提升知识实践与问题解决能力。 03 难点 重点 重点 Think and answer 1. What kinds of things do you think are in an ecosystem? An ecosystem includes all the living things (such as plants, animals, microorganisms) and non-living things (such as water, air, soil, sunlight, temperature) in an area. Think and answer 2. What do you know about oceans, wetlands and forests? Oceans: They are large bodies of salt water, covering most of the Earth's surface. They are home to a great variety of marine organisms（海洋生物） and are important for regulating the Earth's climate. Think and answer 2. What do you know about oceans, wetlands and forests? Wetlands: They are areas where the land is often covered with water, such as swamps and marshes（沼泽、湿地）. They can purify（净化） water and provide habitats for many rare animals and plants. Think and answer 2. What do you know about oceans, wetlands and forests? Forests: They are large areas covered with trees. They can produce oxygen, absorb carbon dioxide and provide living spaces for numerous animals. Read and predict A. The different sizes of ecosystems. B. The three major ecosystems (oceans, wetlands and forests) and their roles. C. How to protect the natural world. What does the article mainly talk about? ( ) B Tips: We can predict the passage from the title and the pictures. Read and choose A. B. C. D. What is the structure of the passage? ( ) C Read and match Match each paragraph with the correct main idea below. Para.1 Para.2 Para.3 Para.4 Para.5 a Wetland ecosystem: features and roles b All ecosystems: definition, sizes and general roles c Forest ecosystem: features and roles d Summary of the three ecosystems' significance e Ocean ecosystem: features and roles Read and write a Cover about 71% of the earth's surface b Cover nearly a third of the earth's land area c Help clean the water d Help make the air clean e Help prevent floods f Produce about 70% of the earth's oxygen g The “heart” of the earth h The “lungs” of the earth i The “kidneys” of the earth A Look at the picture and choose the correct descriptions for each ecosystem. Write the correct letters in the boxes. a, f, g b, d, h c, e, i Read and choose 1. What is an ecosystem made up of ? ( ) C A. Oceans, wetlands and forests. B. Plants and animals. C. Living and non-living things. Read para 1 and choose the right answer. An ecosystem includes all the living and non-living things in an area. Ecosystems can be of different sizes, from small ponds to large grasslands. Each ecosystem has a role to play and helps keep the balance between all its members and the greater environment. Read and choose 2. Why is the ocean the largest ecosystem of the three? ( ) B A. It holds plenty of water. B. It makes up about 71% of the earth's surface. C. It is home to many kinds of plants and animals. The ocean is a very large ecosystem on earth. It covers around 71% of the earth's surface and produces about 70% of the earth's oxygen. It holds plenty of salt water, and the water rises to the sky, falls onto the land and then returns to the ocean. This goes on and on, so the ocean is just like the “heart” of the earth. Read para 2 and choose the right answer. Read and choose 3. What do wetlands do during heavy rains? ( ) B A. They make the water clean. B. They hold water. C. They get rid of water. Wetlands only cover about 6% of the earth's land area. But they are home to about 40% of the world's plants and animals. Plants in wetlands help get rid of pollution and make the water clean. Wetlands can also help prevent floods. During heavy rains, wetlands store water like giant sponges. They act like the “kidneys” of the earth. Read para 3 and choose the right answer. store: 1. 商店，零售店 2. 储存，保存 3. 库存，储备 store Read and choose 4. “They also trap pollution in their leaves and help clean the air.” Which word can we use to replace the word “trap”? ( ) A A. keep　　　　　　　　B. drive　　　　　　　　C. produce Forests make up nearly a third of the earth's land area. Plants there take in carbon dioxide from the air and produce oxygen. They also trap harmful things in their leaves and help clean the air. Therefore, people often call forests the “lungs” of the earth. Read and choose 5. Where can we read this kind of article? ( ) C A. In a newspaper. B. In a travel blog. C. In a geography magazine. Listen and read The big three: oceans, wetlands and forests Listen and read Discuss and answer Which of the three ecosystems do you think is the most important for our daily life? Why? List 2-3 reasons based on what we learned in class. First, pick one ecosystem (ocean, wetland or forest) that you think is most important. Use its key functions from the lesson to support your idea (e.g., “Forests are important because they produce oxygen—we need oxygen to breathe”). Make sure your reasons are clear and match what we read about the ecosystem’s roles. Tips to Help You Discuss include 作动词，意为“包括；包含”，强调一个整体包含着若干个独立部分，或者一个东西包含着另一个东西的一部分。 including 是include 的动名词形式，但通常独立用作介词，意为“包括……在内”，常和前面的内容用逗号隔开。 include ... in 是一个动词短语，意为“把……包括在内”。 1. include /ɪn'kluːd/ vt. 包括 Language points 1. Our group __________ Tom and Tim. There are altogether 8 students. A. included B. includes C. including D. include 2. Ten friends went to her birthday party, __________ (include) me. 3. 报告应当把AI 学习列入我们的计划。 The report should __________ the AI studying __________ our plan. B including include in Let’s practice around 作副词，意为“大约”，用于表示数量、时间、年龄等的不确切或近似数。 around 还可以作介词，意为“在……周围” look around 意为“环视；向四周看” 2. around /ə'raʊnd/ adv. 大约 Language points hold 作动词，有以下几种意义： (1) 容纳：指某个空间的大小能装下一些人或物； (2) 拿着：指用手拿着某些物品； (3) 举行：指举行会议或活动； (4) 承载、支撑：指承载某种物体的重量 3. hold /həʊld/ vt. 容纳；拿着；举行 hold on 别挂断电话；稍等 Language points 1. The CR450 can travel at a top speed of 453 kilometers an hour and it can ________ (容纳) many passengers. 2. He is ________ (拿着) a letter in his hand and waving to us. 3. 由于天气原因，我们只好把运动会推迟到下周。 We had to ________________ the sports meeting till next week because of the weather. hold holding hold off / put off Let’s practice return 作动词，意为“返回”，常用短语：return to + 地点，意为“返回某地”。 return 还可以表示“归还”构成短语： return sth. to sb. 把某物归还给某人 in return 作为回报 4. return /rɪ'tɜːn/ vi. 返回，回去，回来 Language points 1. We _________ the books to the library after we read them. A. returned　　　B. pointed　　　C. waved　　　D. caught 2. 然后他们返回自己的座位。 Then they _________ _________ their own seats. A returned to Let’s practice prevent 作动词，意为“防止，阻止”，后面可以直接加名词或代词作宾语。prevent sb. from doing sth. 是其常用短语，意为“阻止某人做某事”。 5. prevent /prɪ'vent/ vt. 防止，阻止 Language points 1. We should try our best __________ (prevent) home fires. 2. 父母总是试图阻止孩子玩太多游戏。 Parents always try to ________ their children ________ ________ games too much. to prevent prevent from playing Let’s practice store 作动词，意为“贮存；存储”，后面可以直接接名词作宾语。 store up 意为“储存；积累”。 store 还可以作名词，意为“商店；仓库”。 6. store /stɔː(r)/ vt. 贮存 Language points act 可以作不及物动词，意为“起作用；行动”，也可以作及物动词，意为“扮演”，主要表示以下意义： (1) 起作用：表示某种东西或话语对另一种东西或某人产生影响； (2) 行动：表示采取行动来解决问题或实现目标； (3) 表现：表示人的行为方式，描述人的举止或态度； (4) 扮演：表示在戏剧或电影中扮演某个角色 7. act /ækt/ vi. 起作用；行动 vi. & vt. 扮演 Language points take action 采取行动 act like 表现得像…… act as 充当；担任 act out 表演出来 1. The medicine _________ quickly on her, and she felt better. 2. We should take _________ (act) to protect animals in danger. 3. 在自然界中，森林扮演了自然卫士的角色。 In nature, forests _________ _________ the natural guardians. acted action act as Let’s practice Summary Coverage: ~71% of Earth's surface Functions: Produces 70% O₂; Continuous water circulation Metaphor: “Earth's Heart” Ecosystems Summary Coverage: ~6% of Earth's land Functions: Homes for 40% plants/animals; Purifies water; Prevents floods Metaphor: “Earth's Kidneys” Coverage: ~1/3 of Earth's land Functions: Absorbs CO₂; Produces O₂; Cleans air Metaphor: “Earth's Lungs” 2. Three Major Ecosystems Ocean Wetland Forest 1. Base: Copy 3 key sentences about each of the three major ecosystems (oceans, wetlands, forests) from the text, and translate them into Chinese. 2. Practice: Make 2 sentences for each of the phrases “prevent sb. from doing sth.”, “act as” and “return to”, combining with topics related to natural ecosystems. 3. Expand: Share the knowledge of the three major ecosystems learned today with your family. Homework Bye Bye null 124164.305 $