Unit 4 第3课时 Section A 3a—3d-【七彩课堂】2025-2026学年八年级英语下册同步课件（人教版）

Section A 3a—3d Unit 4 The Wonders of Nature Objectives To know the rivers in the world. To learn about the Yangtze River, the Yellow River and the Nile. To know how and why people connect with rivers. 2 Lead-in Do you know the longest river in China? It the Yangtze River. What’s the longest river in the world? It’s the Nile. Read the conversation and underline the three rivers mentioned. 3a Yaming: Welcome back, Ella! How was your trip? Ella: It was great! We saw the Hukou Waterfall on the Yellow River. Is that the longest river in China? Yaming: No, the Yangtze River is the longest river in China. It travels the farthest and is about 6,300 kilometres long. The Yellow River is 5,464 kilometres long and is the second longest. By the way, do you know why it's called the Yellow River? Ella: Because it’s yellow? Yaming: Right. Some parts of the river carry brown and yellow earth. Ella: That’s interesting! I like learning about rivers. My favourite is the Nile. Did you know it’s the longest river in the world? Yaming: Yes, it’s 6,671 kilometres long. It’s very important in Egypt’s history. Ella: That’s right. Both the Nile and the Yellow River helped ancient civilizations to develop. And they’re still very important today. Yaming: Yes. In China, we even call the Yellow River our “mother river”! Ella: We should protect them at all costs. The Hukou waterfall 壶口瀑布是黄河干流瀑布 。东濒山西省临汾市吉县壶口镇，西临陕西省延安市宜川县壶口镇，为两省共有旅游景区。南距陕西省西安市350千米；北距山西省太原市387千米。 壶口瀑布是中国第二大瀑布，世界上最大的黄色瀑布 。黄河奔流至此，两岸石壁峭立，河口收束狭如壶口，故名壶口瀑布。瀑布上游黄河水面宽300米，在不到500米长距离内，被压缩到20—30米的宽度。1000立方米/秒的河水，从20多米高的陡崖上倾注而泻，形成“千里黄河一壶收”的气概。 拓展知识 Yellow River 黄河，是位于中国北方地区的大河，属世界长河之一，中国第二长河（也有称第二大河流）。黄河之“黄”，实为泥沙。古籍有载：“黄河斗水，泥居其七”。黄河全长约5464千米 ，流域面积约79.47万平方千米（包括内流区4.20万平方千米）。 黄河是中华文明最主要的发源地，中国人称其为中华民族的“母亲河”。每年都会携带十六亿吨泥沙，其中有十二亿吨流入大海，剩下四亿吨长年留在黄河下游，形成冲积平原，有利于种植。 黄河流域是中国开发最早的地区。在世界各地大都还处在蒙昧状态的时候，我们勤劳勇敢的祖先就在这块广阔的土地上斩荆棘、辟草莱，劳动生息，创造了灿烂夺目的古代文化。 拓展知识 Yangtze River 拓展知识 长江，中国境内太平洋水系河流，发源于青海省西南部、青藏高原上的唐古拉山脉主峰各拉丹冬雪山，曲折东流，干流先后流经青海、四川、西藏、云南、重庆、湖北、湖南、江西、安徽、江苏、上海共11个省、自治区和直辖市，最后注入东海。是中国、亚洲第一大河，全球第三长河流。 流域面积180万平方千米，约占全国总面积的1/5，年入海水量9513亿立方米，占全国河流总入海水量的1/3以上。 截至2023年，长江流域内已建设了125座联合调度水工程，涵盖诸如长江三峡、葛洲坝等重要的水利项目。 长江干流素有中国“黄金水道”之称，通航里程达2800多千米。 3b What do Yaming and Ella know about these rivers? Read the conversation and complete the table. River Country Length Importance Yellow River _________ _________km helped in the development of ancient ____________ Nile River _________ _________km China Egypt 5,464 6,671 civilizations 形容词 / 副词比较级变化规则 high— higher low — lower deep —deeper 一般情况下，在词尾加-er large — larger fine — finer 以不发音字母e结尾的词，在词尾加-r heavy — heavier easy — easier early — earlier 以“辅音字母 + y”结尾的双音节词，先把y改为 i ,再加-er 形容词 / 副词比较级变化规则 big — bigger fat — fatter thin — thinner 重读闭音节词词尾只有一个辅音字母时，先双写该辅音字母，再加-er beautiful — more beautiful interesting — more interesting delicious — more delicious 多音节词和部分双音节词在词前加more 不规则变化 原级 比较级 good / well better bad / badly worse many / much more little less far farther further 比较级 (comparatives) 比较级的用法 比较级 (comparatives) 1. 表示在两者进行比较时用比较级，结构为 “A + be/行为动词 + 比较级 + than + B.”。 My paper plane flew farther than Jenny’s. 2. 表示“哪一个更……”时，用“Which/ Who is + 比较级, A or B?”句型。 Which is nearer to the sun, Mars or the earth? 比较级的用法 3. 表示“两者之间较……的一个”时，常用 “the + 比较级”结构。 He is the taller of the two. 4. 表示“越来越……”时，用“比较级 + and + 比较级”，多音节词和部分双音节词用 “more and more + 原级”。 It’s becoming colder and colder. 比较级 (comparatives) 比较级的用法 5. 表示“越…… 就越……”时，用“the + 比较级, the + 比较级”结构。 The more careful you are, the fewer mistakes you will make. 比较级 (comparatives) 3c Listen to the conversation. Then role-play it. Welcome back, Ella! How was your trip? It was great! We saw the Hukou Waterfall on the Yellow River. Is that the longest river in China? No, the Yangtze River is the longest river in China. It travels the farthest and is about 6,300 kilometres long. The Yellow River is 5,464 kilometres long and is the second longest. By the way, do you know why it's called the Yellow River? … 3d Imagine that you are Yaming or Ella. Continue the conversation with a parent about other geographical Features in China. Ella: Could you tell me more about China, Yaming? Yaming: Sure! What would you like to know? Ella: What's the biggest desert in China? Yaming: It's the Taklimakan Desert. Ella: Do you know...? Ask and answer. What is the lowest place in China? It’s the Aydingkol Lake. Language points helped the development of ancient _____ 帮助了古代_____的发展 development n. 发展；壮大 develop v. 发展 developed adj. 发达的；高度发展的 固定搭配 with the development of 随着……的发展 What are your plans for the development of your company? 你打算怎样来发展壮大自己的公司？ 21 2. What’s the biggest desert in China? 中国最大的沙漠是什么？ desert n. 沙漠；荒原 v. 抛弃；遗弃；擅离（职守） （1）Camels are called the “ships of the desert”. 骆驼被称为“沙漠之舟”。 （2）Never desert your friends in trouble. 永远不要在朋友困难时抛弃他们。 n. v. 写出下列单词的比较级。 1. good _______ 2. comfortable ________________ 3. big _______ 4. happy ________ 5. cheap ________ 6. many _______ 7. difficult ______________ 8. little ______________ better more comfortable bigger happier cheaper more more difficult less Exercises 用所给单词的正确形式填空。 development faster I think paper books won’t disappear in the future with the ___________ (develop) of e- products. 2. AI technology in China has developed _______ (fast) than anyone expected. Homework 1.Read the conversations. 2.Make a conversation with your partner about geographical features in China and write it down. 伴你成长 感谢您的观看 null 96106.055 $Welcome back, ella. How was your trip? IT was great. We saw the hooker water fell. The yellow river, is that the longest river in china? No. the yancy river is the longest river in china. IT travels the father st. And is about six thousand, three hundred kilometers long. The yellow river is five thousand, four hundred and sixty four kilometres long and is the second longest. By the way, do you know why it's called the yellow river? Because it's yellow. right? Some parts of the river Carry Brown and yellow worth. That's interesting. I like learning about rivers. My favorite is denial. Did you know it's the longest river in africa? Yes. it's six thousand and six hundred and seventy one kilometers long. It's very important in egypt's . history. That's right. Both denial and the yellow river helped ancient civilizations to develop, and they're still very important today. Yes, in china, we even called the yellow river our mother river. We should protect them by all means.