Unit5 Lesson 4 Thank you, Mr Pasteur! 课件 2025-2026学年冀教版八年级英语下册

Unit 5 4 Thank you, Mr Pasteur! Great inventions 1 Learning objectives In this lesson, we will be able to: Be familiar with the content about how pasteurization makes milk safer and the significance of Louis Pasteur’s work in saving lives and promoting food safety. Write a coherent passage to introduce an invention, applying the “Useful expressions” provided, and organizing information clearly with correct grammar and vocabulary. Through collaborative pair work, students will improve their team - work spirit and communication skills. 2 1 Read the questions and give your answers. Do you drink milk every day? why? Do you know how the milk we drink is processed? 2 Read the passage and answer the questions. While pouring a glass of milk, Jeremy notices something written on the package. Jeremy: Hey Mum! I just noticed a big word on the carton. PASTEURIZED. What does it mean? Mum: Well, if something is pasteurized, it means that it has gone through a process of heating to a certain temperature. Jeremy: Why do we heat milk? Mum: Raw milk has dangerous bacteria and germs. We must heat milk to 72 degrees Celsius for 15 seconds to kill them. Jeremy: How did people discover that? 5 2 Read the passage and answer the questions. Mum: Many years ago,people sometimes got sick when they drank milk. Some of them even died because of the bad bacteria. Jeremy: Wow! Who created this heating process? A dairy farmer or a scientist? Mum: It was Louis Pasteur,a French microbiologist.He invented the process around 1864. Jeremy: That's a long time ago! Mum:(She nods and adds.)Mr Pasteur was one of the greatest scientists. His work saved millions of lives around the world. He was famous for his work on germs. Jeremy:(He raises his glass of milk in the air) Well, here’s a toast to you, Mr Pasteur. Thank you for making the world much safer. 6 2 Read the passage and answer the questions. A According to the passage, what does the word “PASTEURIZED" mean? B How did people know their milk needed to be heated? C How did Louis Pasteur's work make the world safer? It means that the milk has gone through a process of heating to a certain temperature. In the past, people sometimes got sick or even died after drinking milk because of bad bacteria. Then they knew milk needed to be heated. Louis Pasteur discovered the pasteurization process. 7 Read the dialogue and answer the questions. What temperature and duration are needed to pasteurize milk according to the dialogue? Who was Louis Pasteur? 72 degrees Celsius for 15 seconds A French microbiologist 设计意图：Review the words for place，Try to say more places in English. Pave the way for the following study 操作建议：say a place one by one 8 Match the words with their meanings: Pasteurize  Microbes that can cause disease Bacteria  Tiny harmful organisms Germs  Heat to kill bacteria Read the dialogue and answer the questions. 设计意图：Review the words for place，Try to say more places in English. Pave the way for the following study 操作建议：say a place one by one 9 Pasteurization was discovered in 1864. （ ） Raw milk is safer than pasteurized milk. （ ） T F Read the dialogue and write true(T) or false(F). 设计意图：Review the words for place，Try to say more places in English. Pave the way for the following study 操作建议：say a place one by one 10 Pasteurization is a process that keeps milk safe from harmful bacteria by heating it. In the past, people sometimes _________ sick or even died after drinking milk.To __________ this problem, Pasteur __________ the process of pasteurization around 1864. He ____________ the milk to 72 degrees Celsius and kept it at temperature for 15 seconds. Harmful bacteria and germs in the milk ______________, and the milk became safer to drink. 3 Read the passage again and complete the paragraph with the correct forms of the words. invent get solve heat kill got solve invented heated were killed 11 4 Work in pairs. Discuss the following questions and take notes. What's your favourite invention? Who invented it? How did it change our lives? Smartphone Multiple inventors over time  It has changed the way we communicate, work, get information, entertain ourselves. We can call, text, use apps for various tasks, shop online, etc. anytime and anywhere. 12 5 Write a passage to introduce an invention. Useful expressions It was invented by... It was invented in... It has made a great difference in my life/our lives. 13 Show time Checklist Stars Language(语言正确) Pronunciation(发音标准) Body language(使用肢体语言) Creation(有创意) Excellent Great Good Gratitude for science makes our lives safer and healthier. 用法： 及物动词，后接 “倾倒物” + into +“容器 / 接收对象” 。其结构为 pour + 宾语（物） + into + 宾语 。 例句： Please pour the juice into the bottle. 请把果汁倒进瓶子里。 1. While pouring a glass of milk, Jeremy notices something written on the package. pour 意为“倒” Point 17 用法： 主语通常是人，结构为 主语 + get sick ，可接 “because of...”（因…… 生病）补充原因 。 例句： If you eat bad food, you may get sick easily.  如果你吃了不好的食物，你很容易生病。  2. ...people sometimes got sick when they drank milk. get sick 生病 ，“状态变化类短语” Point 18 3 it means that it has gone through a process of heating to a certain temperature. go through 经历（过程、困难等） Point 用法： 及物短语，后接 “过程、流程、困难” 等名词，结构为 go through + 宾语（过程 / 事物） 。 例句： He went through a hard time last year. 他去年经历了一段艰难的时光。  19 4. it means that it has gone through a process of heating to a certain temperature. 某一特定温度  Point 用法： 作宾语或主语，常搭配 “reach（达到）、heat to（加热到）” 等动词，结构为 动词 + a certain temperature 。 例句： Water boils at a certain temperature, 100℃ at sea level.  水在一定温度下沸腾，海平面为 100℃。  20 5. He raises his glass of milk in the air. 把…… 举到空中 Point 用法： 及物短语，结构为 raise + 宾语（物品 / 身体部位等） + in the air ，常出现在 “庆祝、展示” 等语境 。 例句： She raises her hand in the air to answer the question.  她举起手回答问题。  21 22 一、用所给词的适当形式填空 1. Journey to the West ______ （write） by Wu Cheng’en in Ming Dynasty is very popular with teenagers. 2. Eating too much junk food is ________ (harm)to your health. 3.It's too              (danger)for the young children to play near the river by themselves. 4. Qinhuangdao is such a beautiful city that __________ (million) of tourists come here every Summer . 5. The heavy rain may keep us from _______ (go)out tomorrow. written harmful dangerous millions going 23 二、完成句子 为了健康，我们应该选择经过巴氏杀菌的牛奶。 For health, we should choose __________ ________. 很多年前，人们喝生牛奶时有时会生病。 Many years ago, people sometimes ____ ____ when they drank raw milk. 杰里米把他的牛奶杯举到空中致敬巴斯德。 Jeremy _____ ___ ____ ____ ____ ___ ____ ______ to toast Mr Pasteur. 巴氏杀菌法让牛奶变得更安全了。 Pasteurization ______ _____ ______. pasteurized milk  got sick  raises his glass of milk in the air  makes milk safer  24 25 Required（必做） Optional（选做） Copy the following words, phrases and sentences carefully. pour,pasteurize, bacteria, heat, process go through, get sick, millions of, a certain temperature Rewrite the sentence according to the requirement.​ Louis Pasteur invented the pasteurization process. (改被动语态) 26 Lavf58.20.100 null 94982.68 $