2011 年理工类职称英语教材新增文章免费下载

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1、理工类职称英语教材新增文章下载2011年理工类职称英语教材新增文章免费下载阅读理解新增文章（阅读理解新增文章（共6篇）目录：第三十四篇(B级)：BatteriesBuiltbyViruses第三十八篇(B级)：LongerLivesforWildElephants第四十五篇(A级)：SomePeopleDoNotTasteSaltLikeOthers第四十六篇(A级)：MarvelousMetamaterials第三十四篇BatteriesBuiltbyVirusesWhatdochickenpox,thecommoncold，theflu，

2、andAIDShaveincommon?They'realldiseasecausedbyviruses，tinymicroorganismsthatcanpassfrompersontoperson.It’snowonder1thatwhenmostpeoplethinkaboutviruses,findingwaystosteerclearof2virusesiswhat'sonpeople'sminds.Noteveryonerunsfromthetinydiseasecarriers,though3.InCambridge，Massa

3、chusetts4,scientistshavediscoveredthatsomevirusescanbehelpfulinanunusualway.Theyareputtingvirusestowork，teachingthemtobuildsomeoftheworld’ssmallestrechargeablebatteries.Virusesandbatteriesmayseemlikeanunusualpair,butthey'renotsostrangeforengineerAngelaBelcher,whofirstcameup

4、with5theidea.AttheMassachusettsInstituteofTechnology(MIT)inCambridge，sheandhercollaboratorsbringtogetherdifferentareasofscienceinnewways.Inthecaseofthevirus-builtbatteries，scientistscombinewhattheyknowaboutbiology，thetechnologyandproductiontechniques.Belcher’steamincludesPa

5、ulaHammond，helpsputtogetherthetinybatteries，Yet-MingwhoandChiang,anexpertonhowtostoreenergyintheformofabattery."We'reworkingonthingswetraditionallydon’tassociatewithnature,"saysHammond.Manybatteriesarealreadyprettysmall.YoucanholdA，CandDbatteries6inyourhand.Thecoin-likebatt

6、eriesthatpowerwatchesareoftensmallerthanapenny.However，everyyear，newelectronicdeviceslikepersonalmusicplayersorcellphonesgetsmallerthantheyearbefore.Asthesedevicesshrink，ordinarybakerieswon’tbesmallenoughtofitinside.Theidealbatterywillstorealotofenergyinasmallpackage.Rightn

7、ow，Belcher’smodelbattery，ametallicdiskcompletelybuiltbyviruses，lookslikearegularwatchbattery.Butinside，itscomponentsareverysmall-sotinyyoucanonlyseethemwithapowerfulmicroscope.Howsmallarethesebatteryparts?Togetsomeideaofthesize，pluckonehairfromyourhead.Placeyourhaironapiece

8、ofwhitepaperandtrytoseehowwideyourhairis-prettythin，right?Althoughthewidthofeachpe