2013高考英语二轮复习 专题限时训练（二十九）科普知识型阅读理解配套作业（一）（解析版，湖南省专用）

《2013高考英语二轮复习 专题限时训练（二十九）科普知识型阅读理解配套作业（一）（解析版，湖南省专用）》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、专题限时训练(二十九)　[科普知识型阅读理解(一)](限时：25分钟)　　　　　　　　　　　　　　　　　　(一)Americanresearchershavecreatedaroboticjellyfish(水母),namedRobojelly,whichnotonlyexhibitscharacteristicsidealtouseinunderwatersearchandrescueoperations,butcould,theoreticallyatleast,neverrunoutofenergythankstoitbeingfuelledbyhydrogen.Const

2、ructedfromshapememoryalloys(形状记忆合金)(SMA)—smartmaterialswhichhavetheabilitytochangeshapeorsize,Robojellyisabletocopythenaturalmovementsofajellyfishwhenplacedinawatertankandispoweredbychemicalreactionstakingplaceonitssurface.“Toourknowledge,thisisthefirstsuccessfulpoweringofanunderwaterrobotusi

3、ngexternalhydrogenasafuelsource，”saidtheleadauthorofthestudyYonasTadesse.ThecreatorsofRobojelly,fromVirginaTech,presentedtheirresultson21March,2012,inIOPPublishing'sjournalSmartMaterialsandStructures.Thejellyfishisanidealanimaltobasethevehicleonduetoitssimpleswimmingaction:ithastworemarkablem

4、echanismsknownas“rowing”and“jetting”.Thesewerecopiedwellintheroboticjellyfish.Therobotispoweredbyheatproducingchemicalreactionsbetweentheoxygenandhydrogeninwaterandtheplatinum(铂)onitssurface.Theheatthatisgivenoffbythesereactionsistransferredtotheartificialmusclesoftherobot,causingthemtochange

5、intodifferentshapes.Therefore,Robojellycanreproducefuelfromitsnaturalsurroundingsanddoesnotrequireanexternalpowersourceortheconstantreplacementofbatteries.Atthemoment,thehydrogenpoweredRobojellyhasbeenworkingwellwhilebeingdowninawatertank.However,theresearchersadmitthattherobotstillneedsdevel

6、opmenttoachievefullfunctionalityandefficiency.“Thecurrentdesignallowsthejellyfishtoflex(折曲)itseightbellparts,eachoperatedbyafuelpoweredSMAmodule.Thisshouldbeenoughforthejellyfishtoliftitselfupifallthebellpartsareactuated.”“Wearenowresearchingnewwaystodeliverthefuelintoeachpartsothateachonecan

7、becontrolledindividually.Thisshouldallowtherobottobecontrolledandmovedindifferentdirections，”Tadessecontinued.1．WhichofthefollowingisNOTtrueaboutRobojelly?A．Itcanmoveinwaterlikeajellyfish.B．Itcanbecomelargerorsmaller.C．Itcanbeusedinunderwater