(人教版)必修二unit3computers学案

高一英语学案 时间： 2019年 12 月13 日 班级_ 姓名_学案装订线课题：Unit3 Computers教师寄语：Learn as if you were going to live forever. Live as if you were going to die tomorrow.Learning aims: 1. To learn how to use the new words and expressions.2. To develop the students ability of reading.3. To motivate the students interest in science and technology.学习过程. Pre-reading by talking about how computer works How does a computer work?A computer has four main parts: the arithmetic and logic unit (ALU), the control unit, the memory, and the input and output devices (collectively termed I/O). These parts are interconnected by groups of wires. The control unit, ALU, registers, and basic I/O (and often other hardware closely linked with these) are collectively known as a central processing unit (CPU). Early CPUs were comprised of many separate components but since the mid-1970s CPUs have typically been constructed on a single integrated circuit called a microprocessor. Preview the new words.1. 计算vt. _ 7. analytical _2. 普遍的/宇宙的 adj. _ 8.intelligence _3. 工艺；科技;技术n. _ 9. solve _4. 革命 n. _ 10.application _5.真实；事实; 现实 n. _ 11.finance _6.可移动的 adj. _ 12.explore_. During-readingStep I Fast reading-Read the passage quickly and silently, and then answer the following questions.1. Who is the speaker in this story?2. What was the computer called in 1936?3. What happened to the computer in the 1970s?4. Look at these inventions. Can you put them in an order according to the time when they appeared? ( ) analytical machine ( ) laptop ( ) calculating machine ( ) robot ( ) PC ( ) universal machine Step II Careful reading-Read the passage again and answer the following questions.Task 1 Read the passage for the second time and find the topic sentences of each paragraph.Par. 1_Par. 2_Par. 3_What is the main idea of the passage?_Task 2. Read the passage for the third time and finish the timeline below. 16421822The analytical machine was made by Charles Babbage.19361940s_The first family of computers was connected to each other.1970sNow. Please finish the following exercise.1.TranslationAt that time it was considered a technological revolution and the start of my “artificial intelligence”._2. Which sentence in the passage can be replaced by the following one? With time going by, I grew smaller in size._Step III SummaryStep IV Debate How computers have changed our lives? What are the disadvantages and disadvantage of computers? (Discuss with your group members.)Step V Homework请你根据以下要点以 My view on computers 为题写一篇英文短文。要点：1. 电脑已走进普通人的家庭； 2. 电脑的优势： 方便查找信息；可以玩游戏、聊天、听音乐等；发送电子邮件和朋友保持联系等 电脑的劣势： 长间使用电脑危害身体健康；有些人痴迷于网络游戏，浪费了许多宝贵的时间 3.你的观点：注意：1.可根据内容需要适当增加细节 2.词数：120150参考词汇：对 上瘾 be addicted to 方便 convenience _课堂设计流程课题：Computers 第一步：导入本节课题“Computers”.第二步：展示学习目标（