Unit 4 Section B 2a-2c（同步课件）-【精品课】2025-2026学年八年级英语下册同步精品课件（新教材人教版）

Unit 4 The Wonders of Nature What is amazing about nature? Section B 2a-2d 通过匹配、朗读等方式，掌握 below、common、risky、survive、deep 等词汇及反义词的对应关系，感知 how + 形容词/副词 特殊疑问句的用法，准确认读并理解词义。（学习理解） 01 通过造句、短文填空等练习，内化 located、survive、deep 等词汇的用法，能正确使用 how long/high/deep 等结构提问，并能在语篇中运用目标词汇完成填空。（应用实践） 02 通过讨论和拓展练习，理解目标词汇在描述自然、环境等主题语境中的表意功能，能够主动用所学词汇描述一处自然景观，并分享自己对探索自然的看法，认同保护自然的理念。（迁移创新） 03 学习目标 What do you know about Lake Baikal? Lead in Would you like to join our adventure team to explore it? Before the adventure, let’s learn some opposite words. Taklimakan Desert塔克拉玛干沙漠 Sahara Desert撒哈拉大沙漠 large small Mount Qomolangma珠穆朗玛峰 Mount Tai 泰山 high long The Nile 尼罗河 The Yellow River 黄河 low short Mount Everest (high) vs the Dead Sea (low). The northern slope vs the southern slope. Living animals vs the Dead Sea "In nature, we see many opposites" Can you give any examples?" The summit of Mount Everest (top) vs the Mariana Trench (bottom). 2a Match the words on the left with their opposites on the right. 1. below A. safe 2. common B. bottom 3. low C. southern 4. dead D. above 5. top E. unusual 6. northern F. living 7. risky G. high 8. survive H. die Can you give more examples?" Before the adventure, let’s learn some about “How”. Sahara Desert撒哈拉大沙漠 Mount Qomolangma珠穆朗玛峰 The Nile 尼罗河 How large is the Sahara Desert? How high is the Mount Qomolangma? How long is the Nile River? It’s about 9,320,000 square kilometres. It’s about 8,848.86 metres high. It’s about 6,670 kilometres long. Think and share 1. How far is it from your home to school? 2. How heavy is a blue whale? 3. How large is our country? 4. How often do you exercise? It’s about 2 kilometers from my home to school. A blue whale weighs about 150 tons. Our country is about 9.6 million square kilometers in size. I exercise three or four times a week. What do these questions ask about? Distance Weight Size Frequency Can you find the sentence pattern? Sentence pattern: How + adj./adv. ... ? 1. It is ______ to wait for the traffic light to turn red, but it is ______ to walk across the road without looking. safe risky 2. Seeing a cat in the street is very _________, but seeing a wild tiger there is _________. common unusual 3. The kite is ________ the clouds, and the bridge is _______ the river. above below 4. Without sunlight and water, plants cannot ________, they will ______. survive die 5. The _____ of the mountain is covered with snow, while the ________ is full of green trees. top bottom 6. This area has a _________ climate, but its ________ part is much warmer. northern southern 7. The temperature is very ______ in winter, but it becomes ______ in summer. high low 8. The ______ leaves fall to the ground, and _________ plants keep growing in spring. dead living How far is it from your home to school? How heavy is a blue whale? How large is your country? How often do you exercise? long　high　deep　old　fast　soon 1. 2. 3. 4. 5. 6. How long is the Yangtze River? How high is the Mount Kilimanjaro? How deep is the Mariana Trench? How old is the Great Wall? How fast can you run? How soon can you finish the task? Read the examples and make more sentences using how and the words in the box. 2b What Do You Know About Lake Baikal? Where is it? How deep is it? How large is it? What animals live there? | deep | environment | survive | wonderful | surface | dive | Located in Siberia, Russia, Lake Baikal is one of the world's most famous lakes. It is the ______ (1) freshwater lake in the world. To reach the bottom, you must ______ (2) 1,620 metres! It is also larger than most other lakes. Its ______ (3) covers 31,500 square kilometres. That is bigger than the country of Belgium! Lake Baikal is very cold for most of the year. But over 1,200 different types of animals can still ______ (4) in this ______ (5). Today, the lake still attracts many curious travellers. After all, it is a great natural ______ (6)! adj. deepest n. v. adj. n. v. v. dive n. surface v. survive n. environment n. wonder adj. 2c Complete the passage with the correct forms of the words in the box. 2c Complete the passage with the correct forms of the words in the box. deep survive wonderful surface dive Located in Siberia, Russia, Lake Baikal is one of the world’s most famous lakes. It is the __________ freshwater lake in the world. To reach the bottom, you must __________ 1,620 metres! It is also larger than most other lakes. Its __________ covers 31,500 square kilometres. That is bigger than the country of Belgium! Lake Baikal is cold most of the year. But over 1,200 different types of animals can still __________ in this environment. Today, the lake still attracts many curious travellers. After all, it is a great natural __________! deepest drive surface survive wonder Circle the new words in the text. Read the text and match the new words with their meanings. a similar group of things or people be in a place water that is not salty from nature, not made by people make someone interested in something wanting to know something more someone who travels from place to place locate freshwater type attract curious traveller natural New words Meaning / ləʊˈkeɪt/ /ˈfreʃwɔːtə(r)/ / taɪp/ /əˈtrækt/ /ˈkjʊəriəs/ /ˈtrævələ(r)/ /ˈnætʃ(ə)rəl/ Read and answer 1. Where is Lake Baikal located? 2. What kind of lake is Lake Baikal? It is located in Siberia, Russia. 3. How deep is Lake Baikal? 4. How large is Lake Baikal? 5. What did the text compare Lake Baikal with? Why? 6. Why do many travelers visit Lake Baikal? It is the deepest freshwater lake in the world. It is about 1,642 meters deep. It is about 31,500 square kilometres in size. / It is larger than Belgium. It compared Lake Baikal with Belgium. Because it wants to show how large Lake Baikal is. Because it is a great natural wonder and it attracts many travelers. Located in Siberia, Russia, Lake Baikal is one of the world’s most famous lakes. It is the deepest freshwater lake in the world. To reach the bottom, you must dive 1,620 metres! It is also larger than most other lakes. Its surface covers 31,500 square kilometres. That is bigger than the country of Belgium! Lake Baikal is cold most of the year. But over 1,200 different types of animals can still survive in this environment. Today, the lake still attracts many curious travellers. After all, it is a great natural wonder! be located in … 位于…；坐落在… 世界上最著名的湖泊之一 淡水湖 到达底部 cover … square kilometres 覆盖…平方公里 比利时这个国家 一年中的大部分时间 不同种类的动物 在这种环境中 吸引许多好奇的旅行者 一处伟大的自然奇观 一、请将下列单词进行正确的归类,从每类单词中选择一个单词造句。 northeastern waterfall desert deep cliff low coral ambition coast western south high long curious north reef 1.物体特征: ______________________ 造句: ___________________________________________ deep，low，high，long The lake in our town is about 50 metres deep. 2.方向: ________________________________ 造句: ____________________________________________________________ ______________ northeastern，western，south，north We plan to travel to the western part of the country during the summer holiday. 19 3.人物品质: _________________ 造句: ____________________________________________________________ ______ ambition，curious The curious boy always asks his teacher a lot of questions about nature. 4.自然景观: ______________________________________ 造句: ____________________________________________________________ _________ waterfall，desert，cliff，coral，coast，reef We saw a beautiful waterfall when we climbed the mountain yesterday. 20 二、用方框中所给单词的适当形式填空,使短文意思完整、通顺。 bottom survive south top north die Once upon a time,a small tree grew at the 5. _______ of a hill. It was thin and short,but it always looked up at the 6. ____,dreaming of standing there to see the faraway fields. The 7. _________ side of the hill was cold,and in winter,heavy snow fell and strong winds blew. One especially freezing winter,the tree’s leaves all fell off,and it almost 8. _____.But its roots stayed deep in the soil,holding on tightly. bottom top northern died 21 When spring came,warm winds from the 9. _________ plains（平原） blew,and gentle rains fell. The tree slowly came back to life,growing a little taller each year. After five years,it finally reached the top. It had managed to 10. ________ all the hard times,and now it could see rivers,villages,and green hills far away. The little tree smiled,happy that its dream had come true.#1.2 southern survive 从方框中选出下列句子中黑体单词的词义。 below A.（prep.）在（或到）……下面 B.（prep.）少于；低于 C.（adv.）在 （或到）下面 1.Children below ten can enter the park for free.( ) 2.Look!There are some colourful fish swimming below.( ) 3.From the top of the mountain，we could see a lake below us.( ) B C A 23 level A.（n.）水平 B.（n.）高度 C.（adj.）平的；平坦的 4.We can measure the level of the water in the cup with a ruler.( ) 5.We need to practise more to reach the same level as our classmates.( ) 6.Remember to put up the tent on level ground near the lake.( ) B A C 24 degree A.（n.）度数 B.（n.）程度 C.（n.）学位 7.He found a good job in the city after getting a business degree.( ) 8.It is very hot today. I guess that it is 30 degrees.( ) 9.She loves reading to such a degree that she forgets to eat.( ) C A B 25 wonder的用法 知识链接：讲解详见背记本P27考点1 1.My sister _________（想知道） when you can help her with her English. 2.He stayed at the foot of the mountain for three months. He loved the __________（wonder） scenery. wonders wonderful 26 3.Mike wondered how many streets there were in Chongqing.（改为同义句） Mike _______ ___ ______ how many streets there were in Chongqing. wanted to know 4.我希望更多的外国游客来中国旅游，发现中国的文化瑰宝和自然奇观。 I hope more foreign tourists will go on trips to discover China’s cultural treasures and _______ _________. natural wonders 27 die，dead与death辨析 知识链接：讲解详见背记本P27考点2 5.Sam always feels sad when he thinks of his grandpa’s ______. 6.When more and more people speak Putonghua，some dialects（方言） are ______. 7.Too bad! There is something wrong with my new computer and it is _____ now. 8.Peter Smith’s good friend _____ in the countryside three years ago. death dying dead died 28 risk的用法 知识链接：讲解详见背记本P27考点3 9.It is ______（risk） to tell your personal information to others online. 10.You will risk _______（lose） the football match if you don’t practise hard. 11.The small village by the sea is ___ risk when there’s a strong storm. 12.They risked their lives _________（climb） the mountain last month. risky losing at to climb 13.人们在生活中需要冒险，但重要的是要知道如何保持安全。 People need to ____________________ in life，but it’s important to know how to stay safe. take risks/take a risk 29 常见的“长/宽/高/深”等的表达 知识链接：讲解详见背记本P28考点4 14.— __________ is the mountain? —It’s about 2,000 metres high. How high 15.— ___________ is the elephant? —About 5,000 kilos. How heavy 16.— ___________ is your house? —It’s about 80 square metres in size. How large 17.— __________ is this red rope in your hand? —It’s about two metres long. How long 30 1.Dogs _______ wag（摇）their tails when they’re happy. My dog’s ______ way to greet me is jumping up gently. Yesterday，he brought me a leaf—it was a（n） ________ but sweet surprise.（usual） usually usual unusual 2.Emma wants to ________ in learning to play the guitar. She practised every day and ___________ played her first song last night. Her parents cheered—she felt it was a __________ day.（succeed） succeed successfully successful 3.There’s a _____ hole in the old tree in the yard. Grandpa guessed its ______ might be 50 centimetres. I was _______ curious about what’s inside.（deep） deep depth deeply 31 For some 围绕 “自然奇观” 编 1 段对话，用至少 4 个 “How...” 句型。 改写 2c 短文为 80 词左右简介。. For all 选一处自然奇观，制作英文海报（含 1 个 “How...” 问句 + 核心数据）。 准备 30 秒英文介绍，用 2 个核心词 + 1 个目标句型。 Homework Lavf58.20.100 $