Unit7 The natural world. Welcome to the unit 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“生态系统”主题，系统呈现生态系统的定义、分类（陆地与水生）及特征，通过图片提问引导学生识别动物、植物、自然环境词汇，建立从词汇积累到概念理解再到应用的学习支架。 其亮点在于融合视频观看与小组对话，以趣味事实（如橡树栖息500种生物、蜜蜂与花共生）激发兴趣，体现语言能力（词汇运用、对话表达）和思维品质（分类比较生态系统特征）。语法点“so...that...”结合沙漠气候实例，强化语言运用。学生提升学习能力，教师可借结构化活动提高教学效率。

Unit 7 The natural world Yolanda Welcome to the unit understand and remember key words related to ecosystems; arouse students’ interest in the natural world and ecosystems. grasp fun facts about different ecosystems； Learning objectives What can you see in the piuture? Lead-in egret n.白鹭 /ˈiːɡrət/ animal grass plant freshwater physical environment Our world is made up of many 1.. Plants, animals and people 2. with the environment in many places. A park with trees and birds is an example of an 3.. An ecosystem has non-living things like 4. and dirt, and living things like 5.______ and trees. Ecosystems are everywhere. A 6.______ is an ecosystem too. They can be small like a garden or big like a 7.. In an ecosystem, all things are 8.. 备用版答案 1. systems 2. live 3. ecosystem 4. water 5. animals 6. city 7. forest 8. connected animal plant physical environment ecosystem What is an What is an ecosystem? Watch and answer Our world is made up of many 1.. Plants, animals and people 2. with the environment in many places. A park with trees and birds is an example of an 3.. An ecosystem has non-living things like 4. and dirt, and living things like 5.______ and trees. Ecosystems are everywhere. A 6.______ is an ecosystem too. They can be small like a garden or big like a 7.. In an ecosystem, all things are 8.. 备用版答案 1. systems 2. live 3. ecosystem 4. water 5. animals 6. city 7. forest 8. connected Our world is made up of many systems. 1._______, animals and people 2._______ with the environment in many places. A park with trees and birds is an example of an 3._______. An ecosystem has non-living things like 4._______ and dirt, and living things like 5.______ and trees. Ecosystems are everywhere. A 6.______ is an ecosystem too. They can be small like a garden or big like a 7.______. In an ecosystem, all things are 8.________. Plants live ecosystem water animals city forest connected What are the ecosystems divided into ? Watch and answer 2 Terrestrial Ecosystem 陆地生态系统 Aquatic Ecosystem 水生生态系统 Forest Ecosystem森林生态系统 Grassland Ecosystem草原生态系统 Wetland Ecosystem湿地生态系统 Artificial Ecosystem人工生态系统 Desert Ecosystem荒漠生态系统 Tundra Ecosystem苔原/冻土生态系统 Freshwater Ecosystem淡水生态系统 Marine Ecosystem海洋生态系统 What are the ecosystems divided into ? Ecosystems are divided into _____ big types. Rainforests are home to over half of all the types of animals and plants on earth. 雨林 What kind of ecosystem is it ? Forest ecosystem 森林生态系统 ...的一半 =all kinds of...各种各样 How much do you know about the rainforests ? rainforests tropical rainforests 热带雨林 temperate rainforests 温带雨林 hot, near the equator, and full of colorful animals and plants.  are cooler, in middle latitudes, and have big trees and foggy weather. The Amazon rainforest is the biggest rainforest. Coral reefs look like rocks, but they support a lot of life in just a small area. 珊瑚礁 What kind of ecosystem is it ? Marine Ecosystem海洋生态系统 供养许多生物 在很小的区域内 Coral reefs They provide shelter and food for at least 25% of all marine life in the ocean! The largest coral reefs is Australia’s Great Barrier Reef. Grasslands often lie between deserts and forests. 草原 What kind of ecosystem is it ? Grassland Ecosystem草原生态系统 lie-lay-lain. v.躺，位于 1. Grasslands get ______ rainfall compared to forests. A. more B. less C. 更 D. 更 2. Which of the following is the main feature of grasslands? A. tall trees B. sparse shrubs C. plenty of grasses D. plenty of grasses 3. Grasslands are a link between ______ and ______. Why grasslands are the transition zones(过渡地带) lying batween forests and deserts? Grasslands are special transition zones lying between forests and deserts. In terms of rainfall, grasslands get less rain than forests—too little for big trees to grow widely. But they get more rain than deserts, which allows plenty of grasses to live and thrive. For vegetation, grasslands are covered with grasses instead of the tall trees in forests or the sparse shrubs in deserts. This makes grasslands a perfect link connecting the wetter forest areas and the drier desert areas. 1. Grasslands get ______ rainfall compared to forests. 2. Grasslands are a link between ______ and ______. 3. Which of the following is the main feature of grasslands? A. tall trees B. sparse shrubs C. plenty of grasses less forests deserts The ice is home to animals like polar bears and penguins. What kind of ecosystem is it ? Polar ecosystem 极地生态系统 极地冰 Where do they live ? Polar bears live only in the Arctic. Penguins live only in the Antarctic. Antarctic ecosystem 南极生态系统 Arctic ecosystem 北极生态系统 Polar ecosystem 极地生态系统 What other fun facts about ecosystems do you know? 1. One single oak(橡树) tree can be home to more than 500 kinds of living things, like insects, birds, fungi and small mammals. 2. Bees and flowers help each other: bees get sweet nectar(花蜜) for food, and flowers use bees to spread pollen(花粉) and make new seeds. Without bees, many plants would disappear. 3. Tundra areas have permanently frozen soil(永久冻土) called permafrost, which can be hundreds of meters thick. Only small and tough plants like mosses(苔藓) and lichens(地衣) can grow there. What ecosystems are they talking about? grasslands desert Read and fill There are ______ and _______ . There are ______ and _______ . In Inner Mongolia In Africa horses cows lions giraffes Grasslands sheep Read and fill Deserts Climate It’s very dry with little 1.________. There’s huge difference in 2.____________ between day and night. Animals & plants 3.____________ animals and plants can live there. The desert plants keep water in their 4.________, and many animals can get water from these plants. rain temperature Only a few leaves Read and answer What aspects do they talk about for ecosystems? To talk about places, animals, weather,climate,plants... What else can we talk about for ecosystems? The function of the ecosystems, predators and preys, ways of protecting ecosystems. Work in pairs and discuss the topic. Use the conversation below as a model. A: Do you know anything about ...? B: l know that ... in different places are home to ... In …, there are ..., but in …, there are … A: Oh, really? Do you know anything about ...? B: Well, it's ... And … A: Yes, the climate in ... is ... B: it's true. They help … and give food to … Practice Practice Discussion：Why do we need to protect our ecosystems? Because ecosystem provides natural resources Because we are part of the chain. Because we can keep a balance by protecting biodiversity. To treat the earth kindly is to treat oneself kindly. so ... that...意思是“如此……以至于……”,引出结果状语从句。其中so adj/adv that + 从句。如: 1. Yes, the climate in deserts is so awful that only a few animals and plants can live there. 她很细心，把所有的东西弄的紧紧有条。 She is so careful that she always makes everything in good order. Language point so adj/adv that...常与adj/adv enough to do sth做同语句转换。 She is careful enough to make everything in good order. Alex learns Maths so hard that he forgets the date. Alex learns Maths hard enough to forget the date. 25 Homework Have to do: 1. Finish the exerciese. 2. Try to retell what ecosystems are like on P93. Choose to do: Search on the internet to find more fun facts about ecosystems. THE END Thank You null 74761.93 $