2013年职称英语考试用书(理工类b级整理版)

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1、2013年职称英语等级考试用书（理工类）第二部分阅读判断阅读下面的短文，短文后列出了7个句子，请根据短文的内容对每个句子作出判断，如果该句提供的是正确信息，就选A；如果该句提供的是错误信息，就选B；如果该句的信息文章中没有提及，就选C。第十一篇ComputerMouseThebasiccomputermouseisanamazinglycleverinventionwitharelativelysimpledesignthatallowsustopointatthingsonthecomputeranditisver

2、yproductive.Thinkofallthethingsyoucandowithamouselikeselectingtextforcopyingandpasting1,drawing,andevenscrollingonthepagewiththenewermicewiththewheel.Mostofususethecomputermousedailywithoutstoppingtothink2howitworksuntilitgetsdirtyandwehavetolearnhowtocleanit.W

3、elearntopointatthingsbeforewelearntospeak,sothemouseisaverynaturalpointingdevice.Othercomputerpointingdevicesincludelightpensgraphicstabletsandtouchscreens,butthemouseisstillourworkhorse.Thecomputermousewasinventedin1964byDouglasEnglehartofStanfordUniversity.As

4、computerscreensbecamemorepopularandarrowkeyswereusedtomovearoundabodyoftext,itbecameclearthatapointingdevicethatallowedeasiermotionthroughthetextandevenselectionoftextwouldbeveryuseful.Theintroductionofthemouse,withtheAppleLisacomputerin1983,reallystartedthecom

5、puterpublicontheroadtorelyingonthemouseforroutinecomputertasks.3Howdoesthemousework?Wehavetostartatthebottom,sothinkupsidedownfornow.Itallstartswiththemouseball.Asthemouseballinthebottomofthemouserollsoverthemousepad,itpressesagainstandturnstwoshafts.Theshaftsa

6、reconnectedtowheelswithseveralsmallholesinthem.Thewheelshaveapairofsmallelectroniclight-emittingdevicescalledlight-emittingdiodes(LED)mountedoneitherside4.OneLEDsendsalightbeamtotheLEDontheotherside.Asthewheelsspinandaholerotatesby,thelightbeamgetsthroughtotheL

7、EDontheotherside.Butamomentlaterthelightbeamisblockeduntilthenextholeisinplace.TheLEDdetectsachangingpatternoflight,convertsthepatternintoanelectronicsignal,andsendsthesignaltothecomputerthroughwiresinacablethatgoesoutthemousebody.Thiscableisthetailthathelpsgiv

8、ethemouseitsname.Thecomputerinterpretsthesignaltotellitwheretopositionthecursoronthecomputerscreen.Sofarwehaveonlydiscussedthebasiccomputermousethatmostofyouprobablyhaveorha