教学目标lesson 2development of computers2课计算机开发.pdfVIP

Lesson2DevelopmentofComputers

一、教学目标

1.了解计算机的发展相关知识

2.熟记单词

3.阅读课外文章

二、分配

本项目共2个任务，安排3。

三、教学重点

计算机已成为人们生活和工作中不可或缺的一部分。本项目主要介绍电脑

的发展相关信息。熟记相关重点单词，与英语语法。

四、教学难点

1.熟悉单词中文意思。

2.拓展课外阅读。

3.熟悉相关语法。

五、教学内容

Nowadays,computershavebecomeoneofournecessitiesinour

dailylife.However,theywerecompletelyunknowntousseveral

decadesago.Thedevelopmentofcomputershasgonethrougharapid

evolution.WiththeconstructionofthefirstcomputerENIAC,the

moderncomputereracameintobeingsince1950s.Thehistoryof

computerscanbedividedintofivegenerations.Eachgenerationis

markedbyasignificantprogress.

Itisreallyhardtomakeanexactdistinctionofthesefive

periods.Generallyspeaking,thefirstgenerationismarkedfrom1951

to1958.Atthattimecomputerswerelargeinsize,expensiveand

oftenunreliable.Thefirstgenerationofcomputerswerebuiltwith

vacuumtubes.

Thesecondgenerationlastedfrom1959to1964.Themain

characteristicofthisperiodisthattransistorsreplacedvacuum

tubes.Datawasstoredoutsidecomputeroneitherictapeor

disk.Asaresult,computersbecamemuchsmaller,faster,andmore

reliable.

Thethirdgenerationofcomputersrangedfrom1965to1970.Itis

symbolizedbythereplacementoftransistorandtheinvolvementofIC

(IntegratedCircuit).OwingtoIC,computersinthisperiodbecame

evensmallerandfasterandtheirmemorycapacitiesgrewstronger

thaneversince.

Muchsignificantadvancementwasmadeduringthefourth

generationwhichlastedfrom1971to1990.Themosthistoricchange

int