Unit 4 The Wonders of Nature Section A 2a-3d 课件 2025-2026学年人教版英语八年级下册

UNIT 4 The Wonders of Nature Section A 2a-3d Language points 1. 数字的读法 6,300 six thousand three hundred 5,464 five thousand four hundred and sixty-four 6,671 six thousand six hundred and seventy-one 三位一组划分,从右往左,每三位用逗号隔开: 6,300 6 thousand, 300 5,464 5 thousand, 464 12,345 12 thousand, 345 百位与十位 / 个位之间 英式英语:加 and,如 5,464 five thousand four hundred and sixty-four 美式英语:可省略 and,如 five thousand four hundred sixty-four 3. 形容词最高级(Superlatives) the longest river(最长的河流) the second longest(第二长的) the farthest(最远的) 用法:三者及以上比较时,用 the + 形容词最高级;序数词 + 最高级表示 “第几最……”。 2. 数字与长度表达 about 6,300 kilometres long(约 6300 千米长) 5,464 kilometres long(5464 千米长) 结构:数字 + 单位 + long / wide / tall 等。 Mike lives _ from school of all the students, and he always takes the subway to school. A.far B.farther C.the farther D.the farthest 1 Sutong Bridge over the Yangtze River is about _ long. A.eight thousand metres B.eight-thousand-metre C.eight-thousands-metres D.eight thousands metres 2 I like all the shirts in the shop, but I only took the _ one to save money. A.cheaper B.more expensive C.cheapest D.most expensive 3 Exercises Exercises 用单词的适当形式填空。 1. The main purpose of his holiday to Greece was to go _ (dive). 2. Our school library is the _ (large) one in the district, with a lot of different kinds of books. 3. The _(deep) of the swimming pool is two metres, so you need to be careful. 4. The Dead Sea is the _ (low) place on earth. 5. The national park covers an area of 500 _ (square) kilometers. 6. Mount Qomolangma is still growing _ (tall). 7. Many deep-sea animals are _ (color) and strange. diving largest depth lowest square taller colorful It’s the Yellow River. Here’s a video to help us know more about the Yangtze River. Here’s a video to help us know more about the Nile. 10,909 metres 200 metres 3,800 metres over 2,000 metres /s b m s bl/潜水艇 2020 ocean floor blind light 11,000 Ms Gao: Thank you for the wonderful talk, Mr Jones. Now, does anyone have any questions? Emma: I do! Why are so many countries researching the deep sea? Mr Jones: Well, curiosity is one reason. We don't know much about the ocean floor. Fu Xing: I remember that in 2020, China's Fendouzhe dived deeper into the Mariana Trench than many other submersibles in the world and filmed it. But I didn't see any deep-sea animals. What are they like? Mr Jones: Well, many deep-sea animals are large and unusual. Some animals are blind, but they can "see" as well as others. Some even create their own light! Peter: Cool! Are there any other surprising facts about the deep sea? Mr Jones: Did you know that there's rubbish even at 11,000 metres deep? That shocked many people. Ms Gao: That's terrible! We should do something about it. Mr Jones: You're right! What is the largest shark in the deep sea? 深海中最大的鲨鱼是鲸鲨(Rhincodon typus), 它也是现存世界上最大的鱼类,最大个体体长可达 18.8 米,体重超 30 吨。 What is the bottom of the deep sea like? The bottom of the deep sea is very dark and cold. There are lots of strange-looking rocks, mountains in some places, and a lot of soft mud. There are also some special creatures. Why is it important to research the deep sea? First, it helps us understand Earth’s history because many deep-sea rocks and sediments hold clues about past climates. 首先,研究深海能帮我们了解地球的历史,因为许多深海岩石和沉积物中,都藏着能揭示过去气候的线索。 Second, deep-sea creatures have special abilities. For example, they can make light by themselves, and they have special enzymes that work under high pressure. These can help medicine and technology. 深海生物有特殊的适应能力,比如会生物发光,还有能在高压环境下工作的酶,这些都能帮到医药和科技领域。 Most importantly, the deep sea helps control the global climate by taking in carbon dioxide. 最重要的是,深海能吸收二氧化碳,在调节全球气候方面发挥着关键作用。 A: What is the largest shark in the deep sea? B: I think it’s the whale shark. A: Do you know how large it is? B: It can grow up to about 10 to 20 metres in length. A: What is the bottom of the deep sea like? B: It is dark, freezing, and has high pressure. There are also many unique creatures. A: Why is it important to research the deep sea? B: Because the deep sea has unique species for research, holds important resources, and can help control our climate. How should everyone protect the deep sea? The deep sea is home to countless amazing creatures. How much do you know about rivers? Let’s have a quiz! Guess the river! I am called the “Mother River” of China. My water is yellow. Who am I? I am the longest river in China. I flow through many big cities. Who am I? I am the longest river in Africa. I helped build the pyramids. Who am I? (Yellow River) (Yangtze River) (Nile River) What do you think rivers give us? Why do we need to learn about them? Discuss and share your ideas. Rivers are the Lifelines of Civilizations. How much do you know about these three great rivers? Which rivers are in China? Which is in Africa? (Yellow River) (Yangtze River) (Nile River) River Name Length Key Facts / Importance (with hints) Yellow River Known as China’s “_ river”; carries brown and yellow _; the _ longest in China. Yangtze River The _ river in China; travels the _ Nile River The longest river in _; very important in _’s history; helped develop_ Can you fill in the River Information Worksheet ? Let’s check your answers after finishing today’s reading task. 1. What is the conversation mainly about? Great rivers 2.How many rivers are mentioned in the conversation? What are they? Three. They are the Yellow River, the Yangtze River, and the Nile River. 3.Does Ella know much about Chinese rivers at the beginning? How do you know? No, she doesn't. She thought the Yellow River might be the longest. 3a Read the conversation and underline the three rivers mentioned. Skim reading 1. What are the lengths of the three rivers? Fill in the table. River Name Length (km) Yangtze River _ Yellow River _ Nile River _ about 6,300 km 5,464 6,671 Detail reading 2.Why is the Yellow River called the "Yellow River"? Find the exact sentence in the conversation. Detail reading 3.What do the Yellow River and the Nile River have in common according to Ella and Yaming? 4.At the end of the conversation, Ella says: "We should protect them at all costs." Why does she say this? She says this because rivers are important for civilizations, history, and daily life, and they may face danger like pollution. Further thinking Yaming says the Yellow River is called the "mother river" of China. Why do you think people call a river "mother"? What does this tell us about the relationship between people and rivers? A river is called "mother" because it gives life to the people along it, just like a mother gives life to her children. It tells us that rivers are not just water – they are part of our identity and history. 3b What do Yaming and Ella know about these rivers? Read the conversation again and complete the table. River Country Length Importance Yellow River _ _ km helped in the development of ancient _ Nile River _ _km China Egypt about 6,300 6,671 civilizations Pay attention to the expressions. 最长的河流 流经的距离最远 ……公里长 第二长 “the+序数词+最高级”表示“第……最……的” ……和……都 古代文明 call sb./sth. ... 把某人/物叫做…… 顺便说一下 了解/学习…… 不惜任何代价 River Name Key Facts / Importance (with hints) Yellow River Known as China’s “_ river”; carries brown and yellow _; the _ longest in China. Yangtze River The _ river in China; travels the _ Nile River The longest river in _; very important in _’s history; helped develop_ 3c Complete the following chart. Then role-play it. mother earth second longest farthest the world Egypt ancient civilizations "Ella wants to learn more about China. What other geographical features can she ask about? Let's think together." Picture English "Superlative" in simple English ️ Taklimakan Desert The largest desert in China ️ Mount Qomolangma The highest mountain in the world / in China Qinghai Lake The biggest inland lake and biggest saltwater lake in China Yangtze River The longest river in China / in Asia ️ Hainan Island The second largest island in China; the largest tropical island in China ️ Huangshan Mountain One of China’s most famous and beautiful mountains Poyang Lake The biggest freshwater lake in China ️ Gobi Desert One of the largest deserts in Asia "Here are some famous geographical features in China. Let's learn their names." 3d Imagine that you are Yaming or Ella. Continue the conversation with a partner about other geographical features in China. Sure! What would you like to know? Could you tell me more about China, Yaming? What's the biggest desert in China? It's the Taklimakan Desert. Do you know ...? Useful Expressions: Asking about "the best / biggest / longest" What’s the biggest desert in China? Which is the longest river in Asia? Do you know the highest mountain in the world? Where is the largest freshwater lake in China? What’s special about Hainan Island? Answering with superlatives It’s the largest desert in China. It’s the longest river in Asia. It’s the highest mountain in the world. It’s the biggest inland lake in China. It’s one of the most famous mountains in China. Adding extra details • It’s in the northwest of China. • It’s on the border between China and Nepal. • It’s very dry and has amazing sand dunes. • It’s a very beautiful place with many kinds of trees and rocks. Rivers are our heritage, protect them! For all Write a short paragraph (40-50 words) Write about your favourite natural wonder. Include: What it is Where it is How big / high / deep it is Why you like it Why we should protect it For some 制作一张“河流保护倡议书”海报:用英语写下至少3条保护河流的建议。 Homework Lavf59.27.100 Packed by Bilibili XCoder v2.0.2 Blues 85133.555 Blues 80979.68 Lavf58.20.100 null 93180.055 $