资源描述：
《职称英语理工类c级阅读理解复习资料》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、大家论坛club.topsage.com职称英语理工类C级阅读理解复习资料(1)ElectricBackpack 1.Backpacks(背包)areconvenient.Theycanholdyourbooks,yourlunch,andachangeofclothes,leavingyourhandsfreetodootherthings.Someday,ifyoudon’tmindcarryingaheavyload,yourbackpacksmightalsopoweryourMP3player,keepyourcellphonerunning,andma
2、ybeevenlightyourwayhome. 2.LawrenceC.RomeandhiscolleaguesfromtheUniversityofPennsylvaniainPhiladelphia(费城[美国宾夕法尼亚州东南部港市])andtheMarineBiologicalLaboratoryinWoodsHole(美国马萨诸塞州的一个渔村，也是许多重要研究机构所在地),Mass(Massachusetts的缩写：马萨诸塞州，美国东北部的一个州) )haveinventedabackpackthatmakeselectricityfromenergy
3、producedwhileitswearerwalks.Inmilitaryactions,search-and-rescueoperations,andscientificfieldstudies,peoplerelyincreasinglyoncellphones,globalpositioningsystem(GPS)(全球定位系统)receivers(接收机),night-visiongoggles(夜视镜),andotherbattery-powereddevicestogetaroundanddotheirwork..Thebackpack’select
4、ricity-generatingfeaturecoulddramaticallyreducetheamountofawearer’sloadnowdevotedtosparebatteries,reportRomeandhiscolleaguesintheSept.9Science6. 3.Thebackpack’selectricity-creatingpowersdependonspringsusedtohangaclothpackfromitsmetalframe.Theframesitsagainstthewearer’sback,andthewhole
5、packmovesupanddownasthepersonwalks.Agearmechanismconvertsvertical(垂直的)movementsofthepacktorotary(旋转的)motionsofanelectricalgenerator,producingupto7.4watts(瓦(特)). 4.Unexpectedly,testsshowedthatwearersofthenewbackpackaltertheirgaits(步态，步法)inresponsetothepack’soscillations(摆动)sothattheyca
6、rryloadsmorecomfortablyandwithlesseffortthantheydoordinarybackpacks.Becauseofthatsurprisingadvantage,Romeplanstocommercialize(商业化)bothelectricandnon-electricversionsofthebackpack. 5.Thebackpackcouldbeespeciallyusefulforsoldiers,scientists,mountaineers(登山运动员),andemergencyworkerswhotypi
7、callycarryheavybackpacks.Fortherestofus,power-generatingbackpackscouldmakeitpossibletowalk,playvideogames,watchTV,andlistentomusic,allatthesametime.Electricity-generatingpacksaren’tonthemarketyet,butifyoudogetoneeventually,justmakesuretolookbothwaysbeforecrossingthestreet! Questions
