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

Lesson 5 Computers and the internet Unit 5 Great inventions 23021 学习目标 1 2 3 能够掌握本课时单词和短语。 能够从发明的时间线中找出关键节点信息（如时间、人物/发明者、事件与变化），并用时间顺序梳理“发明—改进—普及”的发展脉络，形成对技术演变的整体认识； 能够小组协作选择一种发明，制作出结构清晰、图文结合的时间线作品，并进行口头介绍与分享。 23021 What is it? Is there any in your family? What things do you usually put into it? What information do you know about it? Lead in 23021 Ancient times: Ancient China, Greece, and Rome used ice or snow to preserve food by freezing or chilling it. 1600s: Icehouses were used to preserve food all year round. 1748: William Cullen did an experiment on artificial refrigeration. 1805: Oliver Evans designed the first refrigeration machine. 1890s: Iceboxes became popular. They were smaller icehouses meant for home use. 新课讲授 Reading 23021 1913: Fred W. Wolf invented the first home electric refrigerator. 1918: Mass production of home refrigerators began. 1920s: Refrigerators became popular in some countries. 1940s: Freezer compartments were added. 1980s: Water dispensers were added. 1996: Refrigerators became more energy-saving. 23021 √ 1 Read the timeline and tick the inventor of the first refrigerator. □ William Cullen □ Oliver Evans □ Fred.W.Wolf 23021 2 Read the timeline again and circle the correct answers. A When did refrigerators become popular in some countries? a. In the 1920s b. In the 1800s. c. In the 1980s B What was true about using refrigerators in the 1990s? a. A refrigerator was considered a luxury item. b. The running cost of a refrigerator is so high that no one could afford one. c. Energy-efficient refrigerators had become the new normal 23021 Read the timeline for the third time and complete the mind map below. Ancient times 1748 1890s 1918 1940s 1996 1600s 1805 1913 1920 1980s 23021 8 Read the timeline carefully and complete the short passage. The refrigerator is important in our daily life. Let me introduce the development of it. In ancient times, Ancient China, Greece, and Rome used ______ or ______ to preserve food by ______ and ______ it. In the 1600s, _________ were used to preserve food all year-round. In 1748, William Cullen did an experiment on artificial refrigeration. In ______, Oliver Evans designed the first refrigeration machine. In the 1890s, iceboxes became _______. They were smaller icehouses meant for home use. In 1913, Fred W. Wolf ______ the first home electric refrigerator. In 1918, mass production of home refrigerators began. In the 1920s, refrigerators became popular in some countries. In the 1940s, ______ compartments were added. In the 1980s, water dispensers were added. In 1996, refrigerators became more ______-saving. ice snow freezing chilling icehouses 1805 popular invented freezer energy 23021 9 Language points 1. Ancient China, Greece, and Rome used ice or snow to preserve food by freezing or chilling it.古代中国、希腊和罗马用冰或雪通过冷冻或冷藏来保存食物。 freeze 作不及物动词时，指液体“结冰”或人“极冷”；作及物动词时，意为“使冻结；使结冰”。其过去式为froze，过去分词为frozen。 freeze 可表示“(因寒冷或恐惧) 冻僵；呆住”。常见搭配：freeze up (机器等) 冻住/ 停止运转；(人) 变得冷淡 相关词汇： frozen adj. 冷冻的；结冰的 freezing adj. 极冷的 23021 e.g. Water freezes at 0℃. 水在 0 摄氏度时结冰。 I nearly froze when I went out without a coat. 我没穿外套出门，差点冻僵了。 My computer froze up while I was editing the video. 我编辑视频时电脑突然死机了。 We went ice skating on a frozen lake. 我们去结冰的湖面上溜冰了。 We were forced to work outside in freezing conditions. 我们被迫在户外天寒地冻的环境下工作。 23021 2. They were smaller icehouses meant for homes in the city. be meant for sb./sth.为某人/某物而设计 be meant to do sth. 应该做某事；目的是做某事 e.g. The book is meant for beginners. 这本书是为初学者准备的。 The software is meant to protect computers from viruses. 该软件旨在保护电脑免受病毒攻击。） 23021 3. Refrigerators became more energy-saving. 冰箱变得更加节能。 energy 的一词多义： (1) 作“能源”讲时，指电力、燃料等可利用的能源，为不可数名词。 (2) 作“能量”讲时，指物理概念或人体活动所需的精力，为不可数名词。 常见搭配：take energy from 从……吸取能量 save energy 节约能源 solar energy 太阳能 相关词汇：energetic adj. 精力充沛的 e.g. Solar energy is a clean and renewable resource. 太阳能是一种清洁的可再生资源。 Food provides us with energy. 食物为我们提供能量。 She’s always full of energy. 她总是充满活力。 23021 3 Work in groups. Make a timeline together for an invention. A Discuss and choose an invention. · Search the internet, check out books from the library, or visit a museum related to your topic. · Choose an invention and share the information you have gathered. · Make a list of events about that invention. B Create a framework · Draw your timeline. · Choose a start and end point. · Put the most important dates on the timeline. C Fill in your timeline · Add details and important information about each event. · Write clearly and concisely. · Add pictures. Group work 23021 4 Use the timeline to introduce the invention to your class. Show time 23021 Homework ✍ Retell the development of the refrigerator. ✍ Write a passage about an invention that has appeared in recent years and make an information card. 23021 $