重庆市2013高考英语二轮阅读理解精选训练（10）.doc

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1、2013高考英语重庆八中二轮阅读理解精选训练（10）及答案AIfyouandyourfriendswishtoshareasecret，youcanwriteitincode，andnooneelsewillbeabletoreadit.Codesareonewayofwritinginsecret.Ciphers(暗码)areanother.Inacodeeachwordiswrittenasasecretcodewordoracodenumber.Inaciphereachletterischanged.Codesandciphersh

2、aveplayedanimportantroleinthehistoryoftheworld.JuliusCaesar，theRomanrulerwhodefeatedalmostallthecountriesinEuropeabout2,000yearsago，usedacipherwhenhesentsecretmessagestohistroops.DuringtheAmericanRevolution，GeorgeWashington'sspiesusedakindofcodetosendhisinformationaboutthe

3、enemybeforehismilitaryaction.InWorldWarⅡ，theAmericans“broke”orfiguredoutJapan'smostimportantnavycodesandgotenoughinformationtodestroyapowerfulJapanesefleet.Storekeepersusecodestomarktheirgoods.Thecodesshowhowmuchispaidforthegoodsorwhentheyareaddedtothestock.Businessmenusec

4、odestohideplansfromtheirbusinessenemies.Sometimespersonallettersordiariesarewrittenincode.Manypeopleenjoyfiguringoutcodesandcipherssimplyasahobby.Storekeepersusecodestomarktheirgoods.Thecodesshowhowmuchispaidforthegoodsorwhentheyareaddedtothestock.Businessmenusecodestohide

5、plansfromtheirbusinessenemies.Sometimespersonallettersordiariesarewrittenincode.Manypeopleenjoyfiguringoutcodesandcipherssimplyasahobby.Inthe16thcentury，codesandcipherswereverypopularamongscientists.Theywrotemessagestoeachotherincodesothatnooneelsewouldlearntheirsecrets.Ge

6、ronimoGardano，anItalianastrologer(占星家)，mathematician，anddoctor，inventedthetrelliscipher.Hetooktwosheetsofpaperandcutexactlythesameholesineachone.Thenhesentonesheet，whichhecalledatrellis，toafriendandkepttheotherforhimself.Wheneverhewantedtowriteamessage，heputhistrellisovera

7、cleansheetofpaperandwrotethesecretmessagethroughtheholes.Thereheremovedthetrellisandfilledtherestofthepaperwithwordsthatwouldmakesense.Whenhisfriendreceivedit，heputhistrellisoverthewritingandreadthesecretmessage.56.Thebesttitleofthispassagewouldbe________.A.Codesandciphers

8、B.DifferencesbetweencodesandciphersC.HistoryofcodesandciphersD.Inventorsofcodesandciphers