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

The Wonders The Wonders The Wonders Unit 4 第三课时 4a-4d of Nature of Nature of Nature Section A What is amazing about nature?  知识目标：掌握英语中大数字的读法与写法；识记形容词最高级的规则变化和不规则变化，理解最高级的基本句型。  文化意识：在描述地点、事物的比较活动中，感知不同事物的特点；学会客观评价身边的人与事物，形成理性看待差异的意识。 Learning Objectives Warming up Can you say a number bigger than 10? one hundred 100 two hundred and seventy-eight 278 four hundred and fifty-one 451 7274 ? 较大数字的表达与读法 1. 从数字的右端向左数，每三位数加一个逗号。 2. 从右向左，第一个逗号处读thousand(千)，第二个逗 号处读million(百万)，第三个逗号处读billion(十亿)。 3. 读的时候通常在hundred后加and，如果百位数为0， 则在thousand后加and。 大于一千的基数词的表达法 4.英语中没有直接表示“万”和“亿”的单位词，而要用thousand 和million来表达，如“一万”用“ten thousand”、“一亿”用“one hundred million”。 3,624→three thousand six hundred and twenty-four 564,213,430→ five hundred and sixty-four million, two hundred and thirteen thousand, four hundred and thirty 12,357,089→ twelve million, three hundred and fifty-seven thousand, and eighty-nine 7,204,000,000→seven billion two hundred and four million Grammar 4a Read the sentences. Circle the adjectives which compare things. Underline the adverbs which compare actions. What is the biggest desert in the world? It is the Sahara Desert. How big is it? It is about 9,000,000 square kilometres in size. Where is the deepest point in the ocean? It is in the Mariana Trench. How deep is it? It is about 11,000 metres deep. Some deep-sea animals are blind, but they can “see” as well as others. Mount Qomolangma is one of the greatest wonders of the world, and it is still growing taller. The Yangtze River travels the farthest in China and is about 6,300 kilometres long. 比较级(用于两者之间的比较) ①形容词比较级＋than... He is smarter than me. 他比我聪明。 ②the+比较级, the +比较级 越……，就越…… The more you read, the faster you will .你读的越多，速度就越快。 Grammar 形容词和副词的比较级和最高级 比较级(用于两者之间的比较) ③比较级+and+比较级 more and more+原级 The weather is getting warmer and warmer.天气越来越暖和了。 Our hometown is becoming more and more beautiful.我们的家乡变得越来越美丽。 Grammar 形容词和副词的比较级和最高级 越来越…… 最高级(用于三者或三者以上的比较)： ①the+形容词的最高级＋of/in... He is the heaviest of the three. 他是这三个人中最重的。 He is the tallest in his class. 他是他们班最高的。 最高级(用于三者或三者以上的比较)： ②one of the+形容词最高级+可数名词复数 ＋of/in... ……中最……的……之一 Langzhong Ancient City is one of the oldest ancient cities in China. 阆中古城是中国历史最悠久的 古城之一。 最高级(用于三者或三者以上的比较)： ③Which/Who ...+(the) +最高级, A, B or C ? Who sings the best in your class, Tengfei, Alice, Lucy?你们班谁唱的最好， 腾飞，爱丽丝还是露西？ 形容词、副词比较级和最高级的变化： 规则变化 ①一般情况下，单音节或双音节的形容词 （或副词）比较级＋er ，最高级＋est clever－cleverer－cleverest few－fewer－fewest small－smaller－smallest ②以e结尾的词，比较级＋r，最高级＋st nice－nicer－nicest cute－cuter－cutest large－larger－largest ③以“辅音字母＋y”结尾的变y为i＋er或est easy－easier－easiest happy－happier－happiest ④多音节和部分双音节词需要在形容词原级前＋more构成比较级，＋the most构成最高级。 beautiful－more beautiful－the most beautiful careful－more careful－the most careful useful－more useful－the most useful 不规则变化 good －better－best well－better－best bad－worse－worst many, much－more－most far－farther－farthest (距离远) far－further－furthest (程度深) old－elder－eldest (长幼) old－older－oldest (年龄) 1.Mount Kilimanjaro is________ (five thousand, eight hundred and ninety-five) metres high. 2.__________ (twenty-five thousand, seven hundred and sixty- eight) cubic metres of water pours down Inga Falls each second. 3.The East African Rift Valley is about 4,000 (______________) miles long. 4.The Taklimakan Desert has a total area of about 337,000 (____________________________________) square kilometres. 5, 895 three hundred and thirty-seven thousand 4b Write or spell out the numbers. 25, 768 four thousand 总面积为…… My friends and I visited Victoria Falls in Africa last year. Visiting one of the world’s_________ waterfalls was a magical experience. As we went_________ to the falls, the noise of the water slowly grew louder and_________. Then, right before our eyes, the waterfall appeared. It went on for as_______ as the eye could see. Later, we sat in a special pool at the top of the falls. There, we felt the water rush past us and become a part of the waterfall. It was the scariest but also the______________ experience of our trip!  largest most amazing closer louder far  极目所尽 Practice 1) Mount Qomolangma is_________than any other mountain in the world. 2) The Sahara Desert is_____________ desert in the world. 4) The Nile is____________ river in the world. 6) — Did you know that China is one of___________ countries in the world? — Yes, I did. It’s_______ _______ than my country. higher the biggest Fill in the blanks. the longest the oldest much older Summary 比较级和最高级的构成 语法知识导图 比较级+than the+比较级，the+比较级 比较级的用法 规则变化、不规则变化 形容词和副词的比较级与最高级 比较级+and+比较级 more and more+形容词/副词原级 语法知识导图 最高级的用法 形容词和副词的比较级与最高级 (the+)最高级+in/of/among短语 one of the+形容词最高级+可数名词复数+in/of 短语 “Which/Who…(+the)+最高级，A, B or C?” Thanks $