Unit 7The natural world (Reading II）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海洋、湿地、森林三大生态系统，系统呈现其覆盖范围、功能（如海洋产氧70%、湿地净化水源）及面临的问题，通过目标词汇（如“be home to”“take in”）填空练习、生态系统特征表格总结，帮助学生构建知识框架。课堂以Free talk环节导入，引导学生列举其他生态系统，连接已知与新知，形成学习支架。 其亮点在于融合思维品质与语言能力培养，通过“Think and share”小组讨论（如分析人类活动对生态系统的负面影响）提升批判性思维与口语表达，结合“Read and complete”播客脚本填空活动，在语境中强化词汇语法运用。采用表格归纳生态系统特征、语言点分类练习（如“harm”的用法辨析），学生能提升知识迁移能力，教师可借助结构化活动高效开展教学。

初中英语译林版八上 The natural world Reading (II) Unit 7 通过本课时的学习，学生能够： Learning objectives 通过知识点总结与练习，掌握与海洋生态系统相关的语言知识，实现知识的迁移运用。 03 通过完成填空练习，准确运用目标词汇和短语（如 “be home to” “take in” 等）。 01 通过小组讨论和问题回答，深入理解海洋生态系统的重要性及面临的问题，提升批判性思维和口语表达能力。 02 重点 重点 Ecosystems Summary Read and retell Three Major Ecosystems Coverage: ~71% of Earth's surface Functions: Produces 70% O₂; Continuous water circulation Metaphor: “Earth's Heart” Ocean Coverage: ~6% of Earth's land Functions: Homes for 40% plants/animals; Purifies water; Prevents floods Metaphor: “Earth's Kidneys” Wetland Coverage: ~1/3 of Earth's land Functions: Absorbs CO₂; Produces O₂; Cleans air Metaphor: “Earth's Lungs” Forest Besides the oceans, wetlands and forests, what other ecosystems do you know? I also know the grassland ecosystem, the desert ecosystem, the river ecosystem, the lake ecosystem, the urban ecosystem and agricultural ecosystem. Free talk Read and complete C Simon is listening to a podcast about the ocean ecosystem. Complete the script with the correct forms of the words and phrases in the box below. balance be home to surface oxygen get rid of take in store role The biggest ecosystem Hello listeners! Welcome to Science with Doctor Ted. Today I'Il talk to you about the biggest ecosystem on our planet. talk to sb. about sth. 向某人谈论某事 Read and complete balance be home to surface oxygen get rid of take in store role Do you know what it is? Yes, it's the ocean. It covers the largest area of the earth's (1)__________ and holds 97% of the earth's water. It (2)__________ many animals and plants. Do you know that some of the plants in the ocean produce (3)__________ for the animals living there? What's more, the ocean can (4)__________ 25%-30% of carbon dioxide and (5)__________ heat. surface is home to oxygen take in store Read and complete balance be home to surface oxygen get rid of take in store role It plays an important (6) __________ in slowing down climate change. Sadly, we're facing a serious problem: ocean pollution. There are millions of tons of plastic in the ocean, and it's very difficult to (7) __________ it. It's time for us to take action and protect the ocean. role get rid of “减速” =a lot of/lots of 大量的 Read and complete balance be home to surface oxygen get rid of take in store role 长难句分析：这是一个复合句。主句主语是 the plastic，谓语是 will harm，宾语是 the balance，of the ocean ecosystem 是介词短语作后置定语；从句是由 If 引导的条件状语从句。 If we don't, the plastic will harm the (8)__________ of the ocean ecosystem. balance 长难句分析 Think and share 1. Why are the three ecosystems important for the earth? Ocean: Provides oxygen, regulates climate, supports marine life. Wetland: Protects biodiversity, purifies water, prevents floods. Forest: Cleans air, produces oxygen, maintains atmosphere balance. Think about the questions below. Share your answers with your classmates. Think and share Non-living things: Water, air, sunlight, soil. Importance: Essential for living things (e.g., water for survival, sunlight for plants’ photosynthesis). 2. What are some of the non-living things in an ecosystem? Are they important? Give reasons. Think and share 3. How do human activities affect the ecosystems? Give an example. Negative effect: Industrial waste pollutes oceans, killing marine life. Or deforestation reduces forest area, breaking ecological balance. Example harm 可以作动词或名词，意为“伤害；损害”，其形容词形式是 harmful，意为“有害的”。 do harm to 意为“对……有害”； be harmful to 意为“对……有害” 两个短语后面都接名词或代词宾格作宾语。 1. harm /hɑːm/ vt. & n. 伤害，损害 Language points 1. Many people worry that too much screen time will ________ (harm) their children. 2. Fire is ________ (harm). Keep your children away from it. 3. 喝太多果汁对儿童的牙齿有害。 Drinking too much juice can ______ __________ _____ children’s teeth. harm harmful do harm to be harmful to Let’s practice get rid of 意为“清除；摆脱；丢弃”，表示清除某种不良影响；摆脱某人或某种困境；丢弃不想要的物品等。 2. get rid of 清除；摆脱 Language points 1. He threw away the clothes because they are old. （选出同义短语）______ A. looked out of　　B. took care　　C. got rid of　　D. kept away 2. 我们必须要清除这个地区的污染。 We must ________ ________ ________ the pollution in this area. C get rid Let’s practice of make up 的意思主要有： (2) 编造故事或借口； (3) 组成(一个集体或团队)； (4) 化妆；打扮 3. make up 占据 (某种比例) Language points (1) 占据总量中的一定分量； 1. The big bed ______ almost half of her bedroom. A. cuts up B. puts up C. turns up D. makes up 2. 尽管你迟到了，可是你不应当编造借口。 Although you were late, you shouldn’t ________ ________ excuses. D make up Let’s practice hundred (百)、thousand (千)、million (百万) 都是表示数量的词，它们的用法是：表示具体数量时不使用复数，表示笼统数量时要使用复数，且后面要加介词 of。 4. millions of 数以百万计的 Language points 1. People plant ______ trees on Tree Planting Day every year. A. hundred B. hundreds of C. hundreds D. hundred of 2. 冬天，数以百万计的鸟儿飞向南方。 In winter, ________ ________ birds fly to the south. B millions of Let’s practice 5. It’s time for us to take action and protect the ocean. 是我们采取行动和保护海洋的时候了。 Language points 分析结构 “It’s time (for sb.) + 动词不定式.” 是一种常用的句式结构，意为“（某人）该做某事了”。也可以直接使用“It’s time for + 名词”。 1. It’s time for governments ______ action against climate change. A. to take　　　　B. take　　　　C. takes　　　　D. taking 2. It’s time to have an English class. （改为同义句） _________________________________________ 3. 到了我们做运动的时候了。（翻译句子） _________________________________________ A It’s time for an English class. Let’s practice It’s time for us to do sports. 1. Base: Review the new words and phrases learned in this lesson. 2. Practice: Write a short passage about the importance of one ecosystem (ocean, forest, etc.). 3. Expand: Search for one more fact about ocean pollution and think about a solution, and then share it in the next class. Homework Bye Bye $