Unit 5 Lesson 4课件2025-2026学年冀教版英语八年级下册

Unit 5 Great inventions Lesson 4 Thank you, Mr Pasteur! 23021 能够掌握本课时单词、短语和句型。 能够读懂对话，理解“pasteurized”的含义与目的，回答关于概念解释、原因、人物贡献等问题。 01 02 学习目标 能够用英语谈论自己喜欢的发明，并书写介绍某一项发明。 03 23021 Lead in 23021 Read the passage and answer the questions. A Do you drink milk every day? Why? B Do you know how the milk we drink is processed? Yes, I do. Because it’s good for my health. Yes, I do./No, I don’t. Free talk 新课讲授 23021 Reading 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? 23021 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. 23021 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? If something is pasteurized, it means that it has gone through a process of heating to a certain temperature. Many years ago, people sometimes got sick when they drank milk. Some of them even died because of the bad bacteria. By heating milk to 72 degrees Celsius for 15 seconds to kill bacteria and germs. 23021 Read the passage again and complete the paragraph with the correct forms of the words. invent get solve heat kill 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 that temperature for 15 seconds. Harmful bacteria and germs in the milk _____________, and the milk became safer to drink. got solve invented heated were killed 23021 Work in pairs. Discuss the following questions and take notes. What's your favourite invention? Who invented it? How did it change our lives? I think it’s paper. Cai Lun invented paper in ancient China. Paper made writing and recording information much easier and cheaper. And it helped spread knowledge. Pair work 23021 Writing 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. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 23021 Paper is one of the most important inventions in human history. It was invented by Cai Lun in the Eastern Han Dynasty. Before paper was made, people recorded information on bamboo slips or silk, which were either heavy or expensive. Cai Lun improved the paper-making process,using materials like bark and rags. (树皮和破布) Paper has made a great difference in our lives. It speeded up the spread of knowledge through books, newspapers and magazines. 23021 Language points 1. While pouring a glass of milk, Jeremy notices something written on the package. 杰里米在倒一杯牛奶时，注意到包装上写着一些东西。 pour /pɔ:(r)/ v. 倒；下大雨 (1) 此处指“倒，斟(饮料)”。 e.g. I've poured a cup of tea for you. 我给你倒了一杯茶。 (2) [不及物动词](雨)倾盆而下；下大雨与pour down同义。 e.g. It's pouring outside. 外面下着瓢泼大雨。 It never rains but it pours. 不雨则已，一雨倾盆。/祸不单行。 23021 拓展[动词]倾倒，倒出 pour... into...把...倒入... pour... over...把...倒在...上面 e.g. Pour the oil into a frying pan and heat. 把油倒入煎锅内加热。 Pour the sauce over the pasta. 把酱汁浇在意大利面食上。 23021 2. What does it mean? 同义表达：What’s the meaning of it? What does ... mean? =What’s the meaning of... e.g. What does this word mean? =What’s the meaning of this word? 这个单词是什么意思？ 23021 e.g. I carefully opened the cookbook and went through it. 我小心地打开食谱，仔细地看了一遍。 3. Well, if something is pasteurized, it means that it has gone through a process of heating to a certain temperature. 嗯，如果某种东西经过了巴氏杀菌，意思是它经过了一道加热到特定温度的工序。 go through 经历 e.g. People with SAD(seasonal affective disorder) usually go through bad experiences such as low energy and sadness.患有SAD(季节性情感障碍)的人通常会经历一些不愉快的状况，比如精力不足和情绪低落。 They went through many hardships during the war. 他们在战争期间历经千辛万苦。 拓展：仔细察看；检查 23021 e.g. Most of the food we buy is processed in some way. 我们买的大部分食品都用某种方法加工过。 Supercomputers can collect and process worldwide data very fast.超级计算机可以非常快速地收集和处理全球的数据。 process /'prəʊses/ n. 过程；流程 v. 处理；加工 (1)[名词]过程；流程 in the process of (doing) sth.在（做）某事的过程中 e.g. Her novel is in the process of being turned into a television series.她的小说正被拍成电视剧。 (2)[动词]加工；处理 23021 heat /hiːt/ v. 加热；（使）变暖 n. 热；温度 (1)[动词]加热；（使）变暖 heat up （使）变热；（使）变暖 e.g. I heated up the remains of last night's supper. 我把昨晚的剩饭热了一下。 The office will soon heat up. 办公室很快就会热起来。 (2)[不可数名词]热 e.g. I can feel the heat of the sun on my back. 我能感受到太阳照射在背上的热度。 23021 e.g. Turn the heat down or it' ll burn. 把火调小，否则会烧焦。 (3)[名词]温度 e.g. Drop tangyuan into the boiling water, and cook on medium heat for 1 minute. 将汤圆放入沸水中，用中火煮1分钟。 拓展 heat[名词]炉灶，炉火；暖气设备 23021 4. Many years ago, people sometimes got sick when they drank milk. 许多年前，人们有时会因为喝牛奶而生病。 “get sick 生病”，该短语中 get为系动词，后面跟形容词 sick作表语，表示动作，不能与表示一段时间的状语连用。而 be sick表示生病的状态，可与表示一段时间的状语连用。 e.g. The little boy got sick last Friday and so far he has been sick for five days. 这个小男孩上周五生病了，到目前为止他已经病五天了。 23021 e.g. I'd like to propose a toast to the bride and groom. 我提议为新娘新郎干杯。 5. Well, here's a toast to you, Mr Pasteur. 好吧，敬你一杯，巴斯德先生。 [名词]干杯；敬酒 a toast to sb.敬某人，和某人干杯 招展(1) toast[名词]烤面包片，吐司 e.g. I had a piece of toast for breakfast. 我早饭吃了一片吐司。 23021 e.g. They toasted the birth of their new baby with a big meal. 他们用一顿大餐来为新生儿的降生举杯庆祝。 I toasted the cheese sandwiches. 我烤了干酪三明治。 (2) toast [动词]向······敬酒，为······干杯；烘，烤 23021 当堂检测 根据句意及提示完成下列句子。 1. Will you ____________ (倒) the coffee? 2. I don't like ____________ (生的) meat. 3. My brother wants to be a ____________ (科学家) when he grows up. 4. The teacher explained the ____________ (过程) of experiment in class. 5. Please ____________ (加热) the oil and add the onions. scientist process heat pour raw 23021 ✍ Remember the language points. ✍ Preview Unit 5 Lesson 5. Homework 23021 23 Lavf58.46.101 $