1、Period FourUnit 10 Money Period Period Four Lesson 40 Advertisements 课件（北师大版必修 4）Language Focus1.I think electric toothbrushes are not very practical.我觉得电动牙刷不太实用。归纳拓展electric adj.用电的；与电有关的。用于以下两种情况：一是指可发电的东西；二是指靠电力工作或生产的东西，如 an electric station 发电站；an electric kettle 电热水壶。electrical 指与电相关的物品或人员，如 el
2、ectrical engineer 电气工程师。electronic 电子的，电子操纵的，用电子设备生产的，如electronic computer 电子计算机；electronic mail 电子邮件。Period Four语境助记(1)Can you use the electric iron?你会用电熨斗吗？(2)This machine has an electrical fault.这台机器有点电方面的故障。(3)A lot of electronic equipment is needed for large theatres.大剧院需要很多电子设备。Period Four题组训练
3、用 electric，electrical，electronic 填空(1)Its OK to leave an appliance on so long as you are using itif not，turn it off!(2)Its so hot today，but the fan isnt working.(3)This dictionary is available in form.electrical electric electronic Period Four2.The signals go through glass，doors and walls.信号可穿透玻璃、门和
4、墙壁。归纳拓展signal n.信号，暗号；v.发信号，发暗号，示意signal(to)sb.to do sth.示意某人做某事Period Four语境助记(1)Ive been trying to call her，but I keep getting a busy signal.我不停地打电话给她，但老占线。(2)When she got up from the chair，it was obviously the signalfor us to leave.当她从椅子上站起来的时候，这很明显是让我们离开的信号。(3)Our captain signalled to us to leav
5、e.队长示意我们该走了。Period Four题组训练用 signal，sign，symbol，mark 填空(1)It was Pablo Picasso who made the dove a modern of peace when he used it on a poster for the World Peace Congress in 1949.(2)The sportsmen are all ready，waiting for the to start running.(3)Sir，you are not permitted to walk your pet dog on the
6、 lawn.Dont you see the：“Keep Off the Grass”？(4)He made a on the stone to indicate the place where his treasures were buried.symbolsignalsignmarkPeriod Four解析 signal 常指约定俗成的用于传达某些信息的信号，也指灯光、声音或信号标志。sign 用法最广，可指具体的用于识别或指示的标志，如指标牌等，也可指情绪、性格的直观显示。symbol 指被人们选出的物体或图案，用来代表另一事物，并作为该事物的标记或象征。mark 含义广泛，指事物留下
7、的深刻印迹或某物上用于辨别该物品的附属物，比 sign 更侧重于区别性或揭示性的标志，有时不一定十分直观或明显。Period Four3.It has an automatic focus and flash，so you dont have to worry about anything.它有自动聚焦和闪光，因此不必担心任何事。归纳拓展focus n.焦点；中心；聚焦；v.集中于the focus of attention 注意的中心，焦点focus on/upon 集中于focus sth.on/upon.把焦点对准；把(注意力、精力等)集中于Period Four语境助记(1)Each
8、exercise focuses on a different grammar point.每个练习各有不同的语法重点。(2)I quickly focused the camera on the children.我迅速把照相机的镜头对准孩子们。(3)We must focus our attention on urgent problems.我们必须把注意力集中在紧急的问题上。Period Four题组训练(1)The discussion three main problems.讨论集中在三个主要问题上。(2)The visit helped to world attention the
9、 plight of the refugees.这次访问促进了全世界对难民困境的关注。(3)Public attention at the moment the problem of environment balance.现在公众的注意力集中在环境平衡的问题上。focused on focus on is focused on Period Four4.They are very practical and easy to wash.它们非常实用，便于清洗。归纳拓展在“be性质形容词不定式”结构中，不定式用主动形式表达被动意义。在此结构中形容词说明不定式的特性，句子的主语是不定式的逻辑宾语。
10、常见的此类形容词有 easy，hard，difficult，pleasant，comfortable，dangerous，impossible 等。语境助记(1)The work is easy to do.这样的工作很容易做。(2)These signs are hard to see clearly.这些标志很难看清楚。Period Four题组训练(1)Frances.弗兰西斯很难相处。(2)This question.这个问题很难回答。(3)This machine.Anybody can learn to use it in a few minutes.这台机器很容易操作，任何人都可以在几分钟内学会使用它。is hard to get on with is difficult to answer is very easy to operate