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

英语人教版八年级下册 The Wonders of Nature Section A 4a-4c Unit 4 Learning objectives 通过本节课的学习,学生能够: 1.复习并巩固形容词和副词比较级、最高级的基 本用法,进一步总结并积累用于比较事物的表 达结构。 2. 总结和梳理大数字的表达方法,能较熟练地读 写描述自然景观的数据。 3. 掌握有关地理之最及其高度、长度、深度、面 积等信息的核心问句和答语。 4. 增强对自然奇观的敬畏感,在对比中感受自然 之美,树立保护自然的意识。 重点 重点 Play a game outgoing smart early friendly lazy fast thin funny Say out the comparatives and superlatives of the words as quickly as you can. Read and circle 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. Sort the words or phrases into different groups. Observe and sort biggest deepest greatest as well as taller farthest 最高级 比较级 同级 Read the sentences and fill in the blanks. Read and fill Mount Qomolangma is one of the greatest wonders of the world. 最高级 结构:one of + the + 形容词 + 名词 数。 表示“最……的……之一”。 最高级 复 This lake is the second deepest lake in the area. 序数词 最高级 单 结构:the + + 形容词 +名词 数。 表示“第几最……的……”。 There are some errors in these sentences. Read and correct them. Judge and rewrite The Yangtze River is one of biggest rivers in the world. The Nile is one of the longest river in the world. Mount Qomolangma is one of the higher mountains in the world. The Yangtze River is one of the biggest rivers in the world. The Nile is one of the longest rivers in the world. Mount Qomolangma is one of the highest mountains in the world. There are some errors in these sentences. Read and correct them. Judge and rewrite K2 is the second higher mountain in the world. The Yellow River is second longest river in China. K2 is the highest second mountain in the world. K2 is the second highest mountain in the world. The Yellow River is the second longest river in China. K2 is the second highest mountain in the world. Read the sentences and fill in the blanks. Read and fill Some deep-sea animals are blind, but they can “see” as well as others. 同级比较 表示“和……一样……”,用来说明两个人、两件事物在某一方面程度相同。 as...as 中间要用形容词或副词的 级。 原 Read and summarize Read the sentences and summarize the rules for reading large numbers. It is about 9, 000, 000 square kilometres in size. It is about 11, 000 metres deep. The Yangtze River travels the farthest in China and is about 6, 300 kilometres long. 大数的表达和读法 从数字的右端向左数,每 位数加一个“,”。 从右向左,第一个逗号处读 (千),第二个逗号处 读 (百万),第三个逗号 处读 (十亿)。 三 thousand million billion nine million eleven thousand six thousand three hundred The ocean is about 1, 000, 000, 000 square kilometres in area. one billion or a billion Read and summarize Read the numbers and summarize the rules for reading large numbers. 大数的表达和读法 英式英语中,读的时候通常在hundred后加 ,如果百位数为0,则在thousand后加 。 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“ ”、“一亿”用“ ”。 900, 848, 300 100, thousand million billion one hundred billion, nine hundred million, eight hundred and forty-eight thousand, three hundred and 15, 483, 034 thousand million fifteen million, four hundred and eighty-three thousand, and thirty-four and ten thousand one hundred million Look and fill —How 1. _ is the Yangtze River? —It’s 2. _ (6,300) kilometers long. six thousand, three hundred long a Look at the pictures and fill in the blanks. Look and fill —How high is Qomolangma? —It’s 1. _ _ (8,848.86) 2. _. eight thousand, eight hundred and forty-eight point b meters high eighty-six Look and fill —1. _ is the Sahara Desert? —It’s 2. _ (9,000,000) square kilometers in size. How big nine million c Read and fill —S. + be + _ + kilometer(s)/meter(s)… + _/in size. Can you mark the question sentences? How can you answer them? number (1, 2…) —How + _ + be + S.? adj. 1. —How long is the Yangtze River? —It’s 6,300 kilometers long. 2. —How high is Qomolangma? —It’s 8,848.86 kilometers high. 3. —How big is the Sahara Desert? —It’s 9,000,000 square kilometers in size. adj. (long, high, big…) Read and complete Complete the passage with the correct forms of the words in the box. 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 and louder. 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! closer most amazing largest louder large amazing far close loud far Read and write Write or spell out the numbers. 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 25, 768 four thousand Think and answer Think and answer the questions. 1. Mount Kilimanjaro is 5, 895 metres high. 2. 25, 768 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. What does each of the numbers represent? Height Volume Length Size Why do we add ‘high’ and ‘long’ after the unit for height and length? It is clear that the numerical value describes height or length, rather than any other attribute (属性). Ask and answer Conduct a “Mini Geography Quiz”. Ask and answer questions based on your research. Questions Answers ... ... What is the biggest desert in the world? What is the longest river in China? Which is one of the greatest wonders of the world? Which is deeper, the Mariana Trench or a common sea area? The Sahara. It’s about 9, 000, 000 square kilometres. The Yangtze River. It’s about 6, 300 kilometres long. Mount Qomolangma. The Mariana Trench. Ask and answer Conduct a “Mini Geography Quiz”. Ask and answer questions based on your research. What is the highest...? Which park is bigger, ... or ...? 1. Mount Kilimanjaro is _ (5, 895) metres high. 2. The Sahara Desert is the _ (big) desert in the world, and it’s about 9,000,000 square kilometres in size. 3. The Yangtze River is about _ (6, 300) kilometres long, and it travels _ (far) in China. 4. The Mariana Trench is about _ (11, 000) metres deep, and it’s the _ (deep) point in the ocean. 5. The Taklimakan Desert has a total area of about _ _ (337, 000) square kilometres. Exercise Read and complete the sentences. five thousand, eight hundred and ninety-five biggest six thousand three hundred the farthest eleven thousand deepest three hundred and thirty-seven thousand Summarize After learning this lesson, I can use adjectives and adverbs to compare things or actions. as + adj./adv.原级 + as A + be + the + adj.最高级 + in/of... one of the + adj.最高级 + n.复数. A + v. + adv.最高级 + in/of... read and write large numbers accurately. Count from right to left. Put commas every three digits. Read each group of three digits separately. Use thousand, million, and billion to name large numbers. 1. Organize the data (height, length, or area) for the 10 natural wonders covered in this lesson and write these figures in English. 2. Write a paragraph (approximately 60 words) comparing two parks or two rivers in your hometown. Requirements: Must include one large number expression, at least one comparative form, and one superlative form. Homework Audio generated by ttsmaker.cn null 7968.0 Audio generated by ttsmaker.cn null 5136.0 Audio generated by ttsmaker.cn null 4800.0 Audio generated by ttsmaker.cn null 3744.0 Audio generated by ttsmaker.cn null 7872.0 Audio generated by ttsmaker.cn null 6336.0 $