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1、Unit 2 lesson3 Bell and His TelephoneThe answers are:1.electrical 电力的2.keen desire 强烈的愿望3.settle(in)定居4.citizen 居民Do you know who he is?Bell and His Telephone 电话的发明家是英国人亚历山大贝尔。贝尔出生在英国一个声学世家，后移居美国。在波士顿曾开办过增益聋哑人教师的学校。由于职业上的原因，他研究过听和说的生理功能。后受聘为波士顿大学声音生理学教授，1873年，他辞去教授职务，开始专心研制电话。要研制成电话，先要把声音信号变成电信号，再把电
2、信号变成声信号，在贝尔之前，已经有不少人在研究这个问题。1875年贝尔在工作中看到电报机中应用了能够把电信号和机械运动互相转换的电磁铁，这使他受到了启发。贝尔开始设计电磁式电话。他最初把音叉放在带铁芯的线圈前，音叉振动引起铁芯相应运动，产生感应电流，电流信号传到导线另一头经过转换，变成声信号，随后，贝尔又把音叉换成能够随着声音振动的金属片，把铁芯改作磁棒，经过反复实验，制成了实用的电话装置。1876年，贝尔又获得了美国的电话专利，他不仅发明了电话，而且建起了世界上第一家电话公司。1.Do you know who invented the telephone?2.why did he have
3、 a keen desire to help the deaf 3.What has his invention brought us?4.What has the“electrical speech machine”paved the way for?Answer the following questions after read the text!1.be interested in doing2.Train训练 train sb to do sth 1)We must train them to think independently.2)Elephants can be traine
4、d to do a lot of things,such as carrying people,moving heavy things,and even entertaining tourists.3.Public speaking 演说，演说技巧open to the public be open to the publicPublic:adj.公众的 n.公众，公共场所in public当众，公开地；公然give to the public=give to the world出版，发表 go public：把隐私(或秘密)公诸于众1)Most people are against smok
5、ing in public places 2)For the benefit of the public,do not litter Lesson notes 4.the deaf(the+形容词，过去分词-泛指一类人或物）1)We must look after the aged 2)The duty of a nurse is to take good care of the sick 3)The rich are not always happy.4)He devoted his life to helping the disabled the wounded/the unknown/t
6、he blind/the poor 5.keen 强烈的，热衷的，渴望的 be keen on 热衷于 have a keen desire 有强烈的愿望1)He has a keen interest in gardening 2)he is keen on collecting stamps3)The children always has a keen desire to learn 6.For conj.因为；由于的缘故Lesson notes 7.With hope for 带着的期望 1)With hope for a better life,many farmers come t
7、o work in cities 2)With hope for better education,he entered Fudan University.8.settle in Vt./Vi 定居，移民于 1)Some foreigners settled in America and established their business there.2)Mr.white settled his family in shanghai last year 3)I must settle all my affairs before leaving.9.lead to lead sb to do
8、sth Vt./Vi 引导，导致 1)His interest in painting led him to become a painter later 2)It could lead to infection and other problems.3)Success often leads to arrogance,and arrogance to failure.Lesson notes because,since,as,for表示原因的用法区别关于 because：语气最强，表示直接原因，可用于回答 why 提出的问题、引导表语从句、用于强调句等，而其余三者均不行：1)“Why did
9、nt he come?”“Because he was ill.”2)My stomach hurts because I have eaten too many apples.3)Thats because you cant appreciate music.4)It is because he is honest that I like him.关于 since 与 as：两者所表示的原因都是人们已知的，即对已知事实提供理由，而不是表示直接原因。since 比 as 语气稍强，且比 as 略为正式，它们引导的从句通常放在主句之前，有时也放在主句之后：1)As you werent ther
10、e,I left a message.2)Since you are wrong,you should apologize.since 可用于省略句，而其他三者不行：1)Since so,I have nothing to say.既然如此，我无话可说。Grammar Grammar 关于 for：是并列连词,其余三者为从属连词 表原因时提供补充说明，for 分句应后置，有时可与because替换 还可表示对前面内容的解释或推断比较，不可与Because替换：1)The ground is wet,for(=because)it rained last night.2)It must have
11、 rained last night,for the ground is wet this morning.昨晚一定下过雨，你看今天早上地面是湿的。(此句不能用 because 代 for)Excises _you are ill,Ill go aloneThe days breaks,_ the birds are singing.Someone in the house must be ill,_a doctor has just come out.He is absent today _ he is ill_it is snowing,we shall not got to the pa
12、rk.The answers are:SinceForForBecause As After reading the text,you can choose either task to do.After reading the text,you can choose either task to do.Then show your answersT T T T T T T Twork2.source3.apply for4.send5.mobile phone6.typeHomework for today 用60-70个单词，写写常规电话，手机和电子邮件的优势和劣势，可以参考我们的那篇re
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