Unit 2 Saving the Earth Topic 3 Section C课件- 2025-2026学年仁爱科普版（2012）九年级英语上册

Unit 2 Saving the Earth Topic 3 Section C 能熟悉并正确运用本课时的重点单词和短语 1 2 能通过阅读文章，了解现代科学技术在环境保护方面的作用 1.______the problem, we are looking for new ways to produce power. A.Solve B.Solving C.To solve D.Solves 2.In the near future, many robots________to help us do housework. A.will be used B.will use C.are used D.will be use 预习检测 C A 3.The train can ______a speed of 300 km per hour. A.arrive B.drive C.develop D.reach 4.Not only the parents, but also the child____to have a trip. A.decide B.decides C.deciding D.to decide 5.The price of houses are increasing_______. A.rapid B.rapidly C.difficult D.quick D B B 新课导入 Use but, and, while to answer the following questions. What activities should we do to protect the environment? What activities shouldn’t we do to protect the environment? Read 1a and match the words with the pictures on Page 48. A. acid rain B. nuclear energy C. biogas A C B 1a Read and understand. In many countries, people produce power from coal, but it is very dirty and causes acid rain. Some countries use nuclear energy to produce power. However, nuclear power can be very dangerous. To solve the energy problem, people all over the world are looking for new ways to produce power. China is one of the first countries in the world to use biogas technology. Farmers recycle straw, grass and animal waste to make biogas. This renewable energy is used in people’s everyday lives. Its key disadvantage is that the process requires a long time(up to 30 days) and the cost is high. Read 1a again and complete the table. Item Advantage Disadvantage biogas electric vehicle maglev train renewable long process and high cost save energy,no pollution too small to hold many people quiet, quick, energy-efficient, no pollution much more expensive Read 1a again and complete the table. Item Advantage Disadvantage biogas electric vehicle maglev train renewable long process and high cost for its building save energy, no pollution too small to hold many people quiet, quick, energy-efficient, no pollution much more expensive than traditional steel railways Electric vehicles were developed in the 1990s. On April 11, 2010, a new kind of electric vehicle named “Yezi” was shown in the 2010 Shanghai World Expo. It produces electricity from the sun, the wind and CO2. It can not only protect the environment but also save energy. It’s too small to hold many people, but larger models will be developed in the near future. In China, the best-known maglev train is the German-built one in Shanghai. It takes people just 7 minutes to go to the airport 30 km away. The train can reach a top speed of 431 km per hour. It is quiet and quick. There is no wheel noise, because there are no wheels. Maglev trains are very energy-efficient and do not pollute the air. However, maglev guide paths are much more expensive than traditional steel railways. 知识梳理 Key points 1. Some countries use nuclear energy to produce power. use sth. to do sth./ use sth. for doing. 使用某物来做某事 eg: People used bamboo to write with in the past. 在过去人们使用竹子写字。 People use wind for producing electricity. 人们用风发电。 2b Take notes on your discussion and write a passage with them. You may begin like this: Sunlight can produce a lot of energy. People began to use the energy from the sunlight in different ways many years ago… Example Sunlight can produce a lot of energy. People began to use the energy from the sunlight in different ways many years ago. We can use it to warm the house in the winter, to heat the water for baths, and to produce electricity. What’s more, we can even use it to run vehicles directly in the near future. As is known to us, the energy from the sunlight has a lot of advantages. For example, it is clean, renewable and non-polluting. Besides, it does no harm to our nature. So we’d better use it as much as possible. Key points 1. be the first/second/--- + n. + to do sth. 是第一个做某事的...... be the last + n. + to do sth. 是最后一个做某事的...... eg. China is the first country to realize 5G technology. 2. use sth. to do sth. = use sth. for (doing) sth. 使用某物做某事 3. in+the +年份s/’s 在几世纪几十年代 eg. in the 1980s in the 2010’s 4. require v.需要，需求 1) sth.+ require + (doing) sth. “某事需要被做” 主语是物，用动词ing形式表被动。 e.g. The floor requires cleaning. 2) requre/ need + sth./ to do sth. “需要(做)某物” eg. I requre/need some water. 3) require sb. to do sth. = ask sb. to do sth. 要求某人做某事 eg. My mother asks/requires me to buy some salt for her. 1. Some countries use nuclear energy to produce power. use sth. to do sth. 使用某物做某事 nuclear energy 核能 （同义句转换） 1. My sister is too young to go to school. = My sister isn’t _____ ______ to go to school. 2. The dinning hall is so small that it can’t hold fifty people. = This is ______ a small dinninng hall ______ it can’t hold fifty people. = The dinning hall is ______ small _____ hold fifity people. = The dinning hall isn’t _____ ______ to hold fifty people. old enough such that too to big enough back 5. It takes people just 7 minutes to go to the airport 30 km away. “三个花一个付” (1) 人 + spend + money / time + on sth. /(in) doing sth. (2) 人 + pay + money + for sth. (3) 物 + cost + (sb.) + money (4) It + takes + (sb.) + time + to do sth. (it 是形式主语，to do sth. 是真正的主语） spend — spent — spent (ABB型） pay — paid — paid (ABB型） cost — cost — cost (AAA型） take — took — taken (ABC型） back 17 2. However，nuclear power can be very dangerous. however 然而 dangerous 危险的 Look at the pictures. Do you know what they are? Choose the right picture for each paragraph. paragraph 2 paragraph 3 Paragraph 4 1. 玛丽花了50块买这本书。 Mary ________ 50 yuan on the book. = Mary ________ in _______ the book. = Mary ______ 50 yuan for the book. = The book _______ Mary 50 yuan. 2. — Have you finished rebuilding your house? — Of course. It ______ us three months to do that and it also _____ us quite a lot of money. A. took, cost B. cost, took C. spent, cost D. spent, paid spent spent buying paid cost A back Key points 5. cost v. 花费 (cost---cost---cost) sth. cost too much/too little. 译为“花费多/少”。 sth. cost sb. + 钱 （做谓v.时，主语必须是物） eg. The gold watch cost Mrs. Zhou 30 thousand yuan. cost n. 成本 用 high/ low 来修饰。 eg. The cost of the gold watch is too high. = The gold watch costs too much. 6. up to 达到--- 7. not only... but also.../ neither...nor.../ either...or... 在连接两个主语时，采用“就近原则”。 eg. Neither I nor he is at school. Either he or you are in the dinning hall. Not only she but also I am on the playground. ▲ both...and... 连接主语时，用作复数。 eg. Both I and he are at home. He studies at a college of science and ____________. Kris and Karl come from Europe. They’re ___________. The front ________ of the bike was out of shape. Please call me if he __________ my help. I know the place well, so let me be your _________. guide , wheel, require, German, technology Exercise technology Germans wheel requires guide Read 1a and match the words with the pictures on Page 48. A. acid rain B. nuclear energy C. biogas A C B ( ) ( ) ( ) To solve the energy problem,people all over the world are looking for new ways to produce power. all over the world 全世界 looking for 寻找 Summary We learn: 1. Some words: technology, wheel, steel, require, German, guide , deep 2.Some phrases: run out 3.Some sentences: (1)In many countries, people produce power from coal, but it is very dirty and causes acid rain. (2)They will never run out so they are called renewable sources. We can: Talk about the advantages and disadvantages of some kinds of energy. China is one of the first countries in the world to use biogas technology. one of +可数名词复数 ……之一 biogas technology 生物技术 Homework 1. Read 1a aloud&Learn the new words by heart. 2. Finish Section C in your workbook. 3. Preview Section D. Thank you! 129363.18 $