Unit 4 Section B Reading Plus 课件 2025-2026学年人教版英语八年级下册

该初中英语课件围绕撒哈拉沙漠，涵盖其位置、大小、环境、生命适应及沙漠化问题。课堂通过视频图片导入，用K-W-L表格激活已知，结合标题图片预测大意，搭建从已知到未知的学习支架，引导梳理文章结构与信息。 亮点在于融合语言能力、思维品质与文化意识，通过任务型活动（表格填写、思维导图）提升信息获取与表达，分析沙漠化原因培养批判性思维，引入中国沙漠绿化增强环保与家国情怀。采用合作学习与分层作业，助力学生语言应用与环保意识提升，为教师提供结构化教学方案。

nullnullClose your eyes for a moment. Imagine you are standing in a place where the earth meets the sky in a perfect straight line. The air is very warm and the wind whispers softly against your skin. You look around and all you see is gold. Welcome to the sahara desert. This is not just a place of sand and heat. IT is a place of magic, mystery and stories that are thousands of years old. We are going to explore this giant golden world together. Have you ever wondered what IT feels like to be truly alone with nature? Have you ever thought about a place so big that IT covers almost a third of a whole continent? That is the sahara. IT is the largest hawk desert in our world. Presentation Unit4 The Wonders of Nature Section B Why do we explore nature? Reading plus 课外阅读课公开课 单元主题范畴:人与自然 单元主题内容:自然景观、自然现象、生态保护;自然世界及其价值 (2024新版)人教版 八年级(下册) Presentation Learning Objectives 1.通过观看视频和图片,能够正确地回答问题,能够说出撒哈拉沙漠的基本信息;通过观看标题和图片,能够预测课文大意;能梳理文章结构,概括段落大意,完成信息表格与思维导图。(学习理解) 2.能通过略读和精读获取关键信息;能运用所学语言简单介绍撒哈拉沙漠并表达环保观点;能小组合作完成环保海报并进行简短展示。(应用实践) 3.了解撒哈拉沙漠的现状,认识自然奇观的价值,树立保护自然、对抗沙漠化的环保意识。(迁移创新) Presentation Watch and guess Let’s enjoy a video and guess: What natural wonder is it? What natural wonder is in the video? The Sahara Desert What do you know about the Sahara Desert? Presentation Think and say What do you know about the Sahara Desert? Name Location Size Special facts The Sahara Desert (撒哈拉沙漠) It is in northern Africa. It is the largest hot desert in the world. It is very dry and hot. It has beautiful sand dunes (沙丘). Presentation Discuss and say What comes to your mind when talking about deserts? hot and dry lifeless dangerous lonely camel vast cactus (仙人掌) sandy ... beautiful landscape Presentation Watch and say Let’s enjoy another video and learn more about the Sahara Desert. Presentation Discuss and say What do you already know about the Sahara Desert? KWL chart What I already Konw K What I Want to Know W What I Have Learned L dry and hot in Africa the largest hot desert in the world Camels live there How old is it exactly? What plants and animals live there? How do people live there? ...... Now we have so many interesting questions! Let’s read the text to see if we can find the answers. Presentation Look and predict Look at the title , the picture and answer the questions. Title Picture + What can you see in the picture? I can see a small fox with big ears. Why do you think it has such big ears? To help it stay cool in the hot desert! What might the text talk about? A. The Sahara Desert is the oldest place in the world. B. The Sahara Desert is a large, hot, and dry desert in Africa with special life and a growing problem. C. Camels and fennec foxes are the only animals that can live in the Sahara Desert. Presentation Read and answer Read the text quickly and answer the following questions. 1.What kind of passage is it? A.Exposition(说明文) B.Narration(记叙文) C. Argumentation(议论文) 2. Which kind of material is this text most likely from? A. A geography book. B. A history magazine C. A science report D. A tour guide 3. How many paragraphs are there? 6. Find the topic sentences of each paragraph. Tip: The topic sentence usually lies at the beginning or the end of a paragraph. Presentation Read and answer Match the main idea with each paragraph. The Sahara is a dry and hot desert, and not all deserts are hot. The Sahara Desert is a large, old desert in Africa. The Sahara is getting bigger because of climate change. Some animals like camels and fennec foxes can adapt to the Sahara. Life in the Sahara is hard, and some people live there. The Sahara has rocky ground and other landscapes like sand seas. Presentation Read and answer Match the main idea with each paragraph. How many parts can we divide the text into? What’s the structure of this passage? A. ①/ ②③④⑤/⑥ B. ①②/ ③④/ ⑤⑥ C. ①/②③/④⑤/⑥ Part 1:Basic facts-location,size, age Part 2: Environment-climate(气候) and landforms(地貌) Part 3: Life in the Desert-human life and animal life Part 3: Problem & Warning-desert growth Three. Presentation Fill and choose Read Para.1 and complete the table, then choose the right answers . Basic facts about the Sahara Desert. Location & Size It is in _. It spreads across _ of the continent. It is about _ square kilometres in size. Age - It is at least _ years old. Africa 30 per cent 9 million 4.6 million 1.What does the underlined word "vast" most probably mean? A. Very old B. Very large C. Very dry D. Very hot 2.Which of the following is TRUE about the Sahara Desert? A. It is the oldest place in the world. B. It is over 5 million years old. C. It covers 30% of the African continent. D. It is called "the great desert" in English. Presentation Read and fill Read Part. 2 carefully and complete the table. Category(类别) Content(内容) Desert Climate - All deserts are . - Sahara: dry + . - It is _ desert in the world. Sahara Landforms - Most: . - Also: grass, lakes, mountains, . - Sand seas: look like a sea of sand; sand looks like when wind blows. dry hot the largest hot desert rocky ground sand seas waves Sahara is a hot and dry place. How can people and animals survive there? How is the life there? Presentation Watch and say Presentation Read and complete Read Part. 3 carefully and complete the table. Category Special ways to survive People Move _. Live _ all year round. Camels Can go for a long time _. Can drink _ of water in 13 minutes when they do find water. Fennec foxes Have large ears to help their bodies _. from place to place near water without drinking water more than 100 litres stay cool Life in the Sahara is difficult, but people and animals adapt to survive. Presentation Watch and learn Presentation Look and say But look at the desert itself—does it stay the same all the time? Presentation Watch and say Read Part. 4 (para.6) and answer the questions. 1. How much larger is the Sahara than about a century ago? 2. Why is it growing? 3. What will happen if we don’t take action? It is now about 10 per cent larger than it was about a century ago. Some scientists believe that part of the reason is climate change. As temperatures rise, summers in Africa grow hotter and less rain falls. Water bodies get smaller and the ground gets drier and drier. The desert will keep growing. What other reasons might cause the Sahara to grow? ? Presentation Discuss and say What other reasons might cause the Sahara to grow? 1. 砍伐树木 (Deforestation) - People cut down too many trees for firewood or farming. - Trees help keep the soil and water. Without trees, the land becomes dry and turns into desert. 2. 过度放牧 (Overgrazing) - Too many sheep and goats eat up all the grass. - The soil is left bare. Wind can easily blow it away, and the land becomes desert. 3. 过度开垦 (Over-cultivation) - Farmers plant crops on dry land too often, without letting the soil rest. - The soil loses its nutrients and can’t grow plants anymore. 4. 水资源过度开发 (Overuse of water resources) - People use too much groundwater for farming and daily life. - Rivers and lakes dry up, and the land around them becomes desert. 5. 土壤侵蚀 (Soil erosion) - Without plants to protect the soil, wind and rain wash the good soil away. - The land becomes too poor to grow anything, so it turns into sand. Presentation Discuss and say What can we do to help stop the desert from growing? 1. Plant more trees (植树造林) - We can plant more trees and grass. - They can hold the soil and keep water in the ground. 2. Use water wisely (合理用水) - We should save water in daily life (e.g., turn off taps when not using them). - Farmers can use less water for growing crops. 3. Control grazing (控制放牧) - Farmers should not keep too many sheep or goats in one place. - This way, the grass can grow back. 4. Protect the soil (保护土壤) - We should let dry land rest sometimes, not plant crops all the time. - This helps the soil get back its nutrients. 5. Learn and tell others (宣传环保) - We can learn more about desertification. - We can tell our family and friends to protect the environment too. Presentation Look and say Desert growth 8.2 million square kilometers about 1920 Today ? Sahara Desert area: 8.2 + 8.2 10% = 9.02 9.02 million square kilometers Reasons: _ Future warning: _ 根据美国《气候》杂志的研究数据 一个世纪前(约1920年):面积约为 820万平方公里 Climate change / hotter summers, less rain If we don’t take effective measures, the desert will keep growing. Presentation Watch and learn Presentation Listen and repeat Presentation Look and summary What have you learned about the Sahara? Summary What I already Konw K What I Want to Know W What I Have Learned L KWL chart dry and hot in Africa the largest hot desert in the world Camels live there How old is it exactly? What plants and animals live there? How do people live there? ...... Location Size & Age Geography Life Growth Protection ... Presentation Read and complete 1 Read the text and complete the mind map. in Africa about 9 million square kilometres about 10% larger than what it was about a century ago at least 4.6 million years old about 2 million people; animals like camels and fennec foxes rocky ground, grass, lakes, mountains, and sand seas Presentation Discuss and say 2 1. How is life in the desert different from other places? Life is difficult because of heat, lack of water, and frequent movement for survival. I would like to visit the Sahara Desert for adventures, I would like to see the sand seas and some of the wildlife, like fennec foxes, but I would not like to live there. because the environment is severe (恶劣的). 2. Would you like to visit/live in the Sahara? Why? Discuss the questions. 3. What will happen if the Sahara keeps growing? What can we do to stop it? There may be more droughts. We must fight climate change by reducing pollution. Our country has taken some measures to fight against the desert. Can you name some of them? Do you think they can be used to stop the expansion of the Sahara? Presentation Discuss and say Fight against desert Measures Make laws Build windbreaks Plant more trees and grass Save water ... Presentation Watch and say Protecting the desert is protecting our home; small actions today can stop the sand from swallowing tomorrow’s hope. 守护沙漠,就是守护我们共同的家园,今日的微小行动,能阻止黄沙吞噬明日的希望。 Presentation Look and say Let’s cherish our earth and fight climate change to keep our world green and beautiful. Presentation Language points Para.1 Located in Africa, the Sahara Desert spreads across 30 percent of the continent. This vast desert, also known as "the great desert" in Arabic, is about 9 million square kilometres in size. It is also at least 4.6 million years old. This means that it is one of the oldest places in the world. be located in … 位于…… 横跨……;遍布…… 非洲大陆 广袤的沙漠 在阿拉伯语中 至少 one of the + 形容词最高级 + 复数名词 最…… 之一 Presentation Language points Para.2&3 All deserts are dry, and the Sahara is both dry and hot. It is the largest hot desert in the world. We may think that all deserts are hot, but in fact some deserts are very cold! Many scientists believe that Antarctica, for example, is a type of cold desert. Most of the Sahara is rocky ground. But there are also places with grass, lakes, mountains, and even sand seas. A sand sea is just what it sounds like—it looks like a sea of sand! When the wind blows, the sand looks like waves. 既干燥又炎热 最大的热带沙漠 n.南极洲 n.南极洲 岩石地面 一片沙的海洋 看起来像波浪 Presentation Language points Para.4 Life in the Sahara is difficult. About two million people live in the Sahara. They usually move from place to place. There is water in a few parts of the Sahara, and some people live in these places all year round. 大约两百万人 从一个地方搬到另一个地方 一些地区 全年;一年到头 Presentation Language points Not many animals can live in a place with such a dry and hot climate. They must adapt to survive. Camels, for example, go for a long time without drinking water. When they do find water, they can drink more than 100 litres of it in 13 minutes! Fennec foxes live in the desert too. They have large ears to help their bodies stay cool. with 短语作后置定语 适应环境以求生存 超过 100 升水 耳廓狐(沙漠狐) Para.5 Presentation Language points Today, the world's largest hot desert is getting even bigger. It is now about 10 percent larger than what it was about a century ago. But why is it growing? Some scientists believe that part of the reason is climate change. As temperatures rise, summers in Africa grow hotter and less rain falls. Water bodies get smaller and the ground gets drier and drier. If we do not take effective measures, the desert will keep growing! Para.6 变得甚至更大 / 持续扩大 变得甚至更大 / 持续扩大 但它为什么在扩张呢? 气候变化 气温升高 降雨量也更少 采取有效措施 Presentation Class test 根据文章内容,从方框中选单词并用其适当形式完成短文 The Sahara Desert is a famous natural wonder. It _ across 30 per cent of Africa. It is about 9 million square kilometres in size, making it the _ hot desert in the world. It is also very _—at least 4.6 million years old. Most of the Sahara is rocky ground, with grass, lakes, mountains and sand seas. Life in the desert is not easy. Only about two million people _ there, and they often move from place to place. Animals must _ to the dry and hot _ to _. Camels and fennec foxes are good examples of desert animals. Now the Sahara is _ bigger. It is about 10 per cent larger than it was a _ ago. If we don’t take effective _, the desert will keep growing. spread large old live adapt survive grow century measure climate spreads largest old live adapt climate survive growing century measures Presentation Must do: 1. Copy and remember 5 key words from the passage (e.g., desert, dry, adapt, survive, measure). 2. Write 2 short sentences to describe the Sahara Desert (using the new words). Choose to do: 1. Draw a picture of a fennec fox and label one of its adaptations (e.g., large ears). 2. Find one fact about desert protection and write it down in 1 simple sentence. $Unit four, that's a hora, is IT located in africa. The sahara desert spreads across thirty percent of the continent. This vast desert, also known as the great desert in arabic, is about nine million square kilometers in size. IT is also at least four point six million years old. This means that IT is one of the oldest places in the world. All deserts are dry, and the sahara is both dry and hot. IT is the largest hot desert in the world. We may think that all deserts are hot, but in fact some deserts are very cold. Many scientists believe that antarctica, er, for example. is a type of cold desert. Most of the sahara is rocky ground, but there are also places with grass, lakes, mountains and even sand seas. A sand sea is just what IT sounds like. IT looks like a sea of sand. When the wind blows, the sand looks like waves. Life in the sahara is difficult. About two million people live in the sahara. They usually move from place to place. There is water in a few parts of the sahara, and some people live in these places all year around. Not many animals can live in a place with such a dry and hot climate. They must adapt to survive. Cams, for example, go for a long time without drinking water. When they do find water, they can drink more than one hundred leaders of IT in thirteen minutes. Phenix foxes live in the desert too. They have large ears to help their bodies stay cool. Today, the world's largest hot desert is getting even bigger. IT is now about ten percent larger than what I was about a century ago. But why is IT growing? Some scientists believe that part of the reason is climate change. As temperatures rise, summers in africa grow hotter and less rain falls, water bodies get smaller and the ground gets drier and drier. If we do not take effective measures, the desert will keep growing. Ali lives in the mitt anian desert. He is the last number of his family to preserve the domain tradition. The rest have emigrated to the city or abroad. 微信his wife. data and her brothers have . stayed with him in the desert. Together, they work hard to survive in a hostile environment, which is determined to throw them out forever. The two devastating drought during the eighties dissented the animals to the point that even man could not survive. More than seventy percent of the mitt anian population lives off the pastures. In twenty years. The nomes have . been reduced to half. They look. Hope we should look at this video. The chinese people are taking on nature itself. Turning desert in the first is absolutely the astonishing this project. Notice the three north shelter belt project is a seventy year initiative, ed, planting vast numbers trees certification. What's even more amazing is that they're creating a forest equivalent to the size of south korea every year. I can't wait to witness this extraordinary transformation in person. somebody. This ahaa desert located in africa, this ahaa desert spread s across thirty percent of the continent. This, that dessert, also known as the great dessert in eric, is about nine million square kilometers in size. IT is also at least for point six million years old. This means that IT is one of the oldest places in the world. All deserts are dry, and the sahara is both dry and hard. IT is the largest hot desert in the world. We may think that all deserts are hot, but in fact some desserts are very cold. Many scientists believe that antartica, for example, is the type of cold dessert. Most of the sahara is rocky ground, but there are also places with grass, lakes, mountains and even sense a sand sea is just what IT sounds like. IT looks like a sea of sand. When the wind blows the sand like waves, life in the sahara is difficult. About ten million people live in the sahara. They usually move from place to play. There is water in a few parts of the sahara, and some people live in these places all year round. Not many animals can live in a place with such a dry and hot climate. They must adapt to survive. Cable, for example, go for a long time without drinking water. When they do find water, they can drink more than one hundred leaders of IT in thirteen minutes. Photo c foxes live in the desert too. They have largely to help their bodies stay cool. Today, the world's largest hot dessert is getting even bigger. IT is now about ten percent larger than what I was about a century ago. But why is IT growing? Some scientists believe that part of the reason is climate change. As temperatures rise, summers in africa grow hotter and less rainfall, water bodies gets smaller and the ground gets drier and drier. If we do not take effective measures, the desire will keep growing.