2014届高考英语一轮复习 unit15 指导课时作业b卷（含解析） 北师大版

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1、Unit15B卷一、阅读理解ADoesyourlaptopsometimesgetsohotthatitcanalmostbeusedtofryeggs?Newtechnologymayhelpcoolit，andgiveinformationtechnologyauniquetwist，saysJairoSinova，aprofessor.Laptopsaregettingincreasinglypowerful，butastheygetsmallertheyareheatingup，anddealingw

2、iththeexcessiveheathasbecomeaheadache，Sinovaexplains.“Theheartoftheproblemisthewayinformationisprocessed，”Sinovanotes.“Laptopsandsomeotherdevicesuseflowsofelectricitytoprocessinformation，andtherebyalsoproduceheat.Theoretically，excessiveheatcouldmeltthelapto

3、p，andalsowastesconsiderableenergy.”Sinova’sresearchisonanalternatewaytoprocessinformation.“Ourresearchlooksatthespin(旋转)ofelectrons(电子)，tinyparticlesthatnakedeyescannotdetect，”heexplains.“Thedirectionstheyturncanbeusedtorecordandprocessinformation.”Toproces

4、sinformation，Sinovasays，itisnecessarytocreateinformation，transmittheinformation，andfinallyreadit.Thequestionis，canwechangethewaythisisdone？“Thedevicewe’vedesignedarrangestheelectronsaccordingtospintogetherwiththeinformationwewanttoprocess.Wethentransmitthee

5、lectronstoanotherplaceinthedevicebutwiththespinstillsurviving，andfinallyareabletomeasurethedirectionoftheirspinthroughavoltage(电压)thattheyproduce，”Sinovaexplains.Thebiggestchallengetocreateaspinbaseddevicewasthedistancetheelectronscouldtravelwhilestillkeep

6、ingtheirspin.“Transmissionisnoproblemnow.Whereasbeforethelimitwasseveralhundredfeet，withourdeviceinformationcaneasilybetransmittedhundredsofmiles，”hesays.“Thisnewdevice，astheonlyspinbaseddeviceforinformationprocessing，hasalotofrealpracticalpotential，”hesay

7、s.“Onehugeadvantageisthatitisoperationalatroomtemperature，whichnobodyhadbeenabletoachieveuntilnow.Itmayleadtoanewandmoreefficientwaytoprocessinformation.”1．Todealwithhotlaptops，weneedto______.A．makethemsmallerB．protectthemwithspecialmaterialsC．findanewwayto

8、processinformationD．speedupthemovementofelectrons2．WhatcanwelearnaboutSinova’sdevice?A．Itmakesinformationeasilytransmittedtohundredsofmilesaway.B．Itcanbeoperatedatanytemperature.C．Itcansendinformationa