高中英语（人教大纲）第二册下：unit18 inventions(备课资料)

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1、ReferenceforTeachingⅠ.异域风情Everycountryhasapostalsystem,buttheserviceandspeedofmaildeliveryvary(不同的).TheAmericanpostalserviceisverygood,thoughitisslowerthanpostalserviceinsomecountriessuchasBritain.MostdevelopedWesterncountrieshavefastandreliablemaildeliv

2、ery,butsomecountrieshavebeentroubledbylaborstrikesthatdelayeddeliveriesforweeksormonths.Canadausedtohavesuchstrikes,buthasnothadapostalworkers’strikeformanyyears.StrikesalsohavebeenaprobleminItaly,AustraliaandFrance.Insomecountries,stampshaveoccasionally

3、beenpeeledoff(撕掉)fromlettersandsoldtostampcollectorsbeforetheselettersreachtheirintendedrecipients.Traditionalpostalserviceisbeingchallengedbymoderntechnology.Insteadofbuyingstampsandenvelopesforsendingletters,manypeoplenowusefaxmachinesandE-mailsystems.

4、Thesenewmethodsofcommunicationarealotfasterandarebecomingcheaper.IntheU.S.,manybusinessesuseprivatemailservicesfordeliveryofexpressmailandpackages.ManynewfirmsthatofferexpressmailserviceorspecialdeliveryservicehavestartedtooperateinChina.Someofthesefirms

5、arepartoftheexistingpostalsystem;othersarenotattached(隶属)tothesystemandoperateinconjunctionwithorindependentlyfromthepostalsystem.Ⅱ.知识归纳1.it的用法it作代词，常见用法如下：(1)指天气，时间，距离等Itiscoldtoday.今天天气冷。（指天气）It’sgettingcolderandcolderdaybyday.天气一天天变冷了。（指天气）What’stheda

6、tetoday?It’stheeleventh,October.今天几号了？10月11号。（指日期）It’stimetogotobed.是睡觉的时间了。（指时间）Itwastwelveo’clockalready.已经十二点了。（指时间）Howfarisitfromyourschooltothebusstop?从你们学校到公共汽车站有多远？（指距离）Itisautumnnow.现在是秋天了。（指季节）Itisquiethereinthepark.公园里很安静。（指环境）（2）指代刚提到过的东西（可指具体

7、的东西，也可指抽象的东西）Myfatherboughtmeanewbikeanditcostusfourhundredyuan.我父亲给我买了辆新自行车，花了我们400元。—Iwanttostay.我想留下来。—Yourfatherwon’tlikeit.你父亲不会喜欢你这样的。YougavemealotofhelpwhenIwasinBeijing.AndIwillnotforgetit.在北京你帮了我很大的忙，我是永远忘不了这件事的。（3）作形式主语，代替不定式，动名词或从句Itisimportan

8、ttomasteraforeignlanguage.=Tomasteraforeignlanguageisimportant.掌握外语是重要的。Itisnousesayinganymoreaboutit.=Sayinganymoreaboutitisnouse.关于这件事再多说也无用。Itwon’tmakeanydifferenceyourbeinghere.=Yourbeingherewon’tmakeanydifference.你在不在