PETS-5教材.pdf

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1、波波mp3学习资源网(www.bobomp3.com)全国公共英语等级考试教程第五级ScriptforListeningComprehensionUnit1FindingItOnlineOneofthegreatfeaturesoftheInternetistheamountofinformationitcontains.Informationthatusedtobelimitedtoregionaldistributionvianewspapersandtelevisionsisnowavailablearoundtheglobe.Youcanlookforajobinafaraw

2、aycityorcountry.Youcansellyourcoincollectionviaanationalclassifiedad.YoucanlookupaphonenumberforarestaurantinParis.Butallthisnewlyavailableinformationcomesataprice:confusion.TheinterconnectedanddynamicnatureoftheNetpreventsitfrombeingorganizedlikeatraditionalmedium,suchasabookoranewspaper.Butdo

3、n'tworry,anothergreatthingabouttheInternetisthatitcomesupwithsolutionsforitsownproblems.EnterInternetGuidesandSearchEngines...IftheInternetwereabook,InternetGuideswouldbethetableofcontents.Theyorganizewebsitesintorelatedcategoriesortopics,justasatableofcontentsorganizesthechaptersinabookintodif

4、ferentsections.Ofcourse,inthecaseoftheInternet,the"book"issobigthateventhetableofcontentsneedsitsowntableofcontents.That'swhymostInternetGuidesstartwithtop-levelcategoriesandletyou"drilldown"tomoreandmorespecifictopics.IftheInternetwereabookSearchEngineswouldbetheindex.Inordertocombatthedynamic

5、natureoftheWeb,SearchEnginesareconstantlyrunningsoftwarecalled"robots"or"crawlers"thatreadentirewebsitesandupdatetheindexentriesforthatspecificSearchEngine.SearchEnginessavetheirdataalphabetically,justlikeabook'sindex.But,again,duetotheincredibleamountofinformation,youdon'tbrowsethroughaSearchE

6、ngine'slistings,yousearchthroughthembyenteringaword(orwords)thatcaptureswhatyou'relookingfor.EnterthewordsorphrasesandtheSearchEngineshouldprovideyouwithasetof"resultspages",dependingonthenumberofsuccessful"hits"thatyoursearchproduces.Then,howdoyouknowwhentouseanInternetGuideandwhentouseaSearch

7、Engine?Thebestansweris:Useboth.Now,let'spretendyou'rereadingabookongenealogy.Youmightlookthroughthetableofcontents(aguide)toseeifthere'sachapteronresearchingyourfamilytree.Butifyouwerelookingforamorespecifictopic—likehowtoreadashi