2018年高考英语一轮复习 unit 2 robots考点规范练 新人教版选修7

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1、Unit2RobotsⅠ.阅读理解AEachyear,hikersandmountainbikersgetlostorinjuredinthewilderness.Searchandrescueeffortscaninvolve20ormorepeople.Butanew“smart”drone(无人机)canfollowhikingtrails(小路)withoutapilot’sassistance.Thiscouldallowrescuerstosearchmoreefficiently.Scientistsoutfittedacraftwith

2、asinglecamera.Asthedrone’s“eye”,thecamerapointedforwards.Buthavinganeyewasn’tenough.Thedronealsoneededa“brain”tounderstandwhatitwasseeing.Andthatbrainwouldhavetorecognizewhatconstitutesatrail.Cameraimages,however,canbeverydifficultforacomputertointerpret,studyleaderAlessandroGiu

3、stinotes.Soheandhisteamusedphotosofforesttrailstotraintheirdrone’sneuralnetwork(神经网络).TheyattachedthreeGoProcamerastoasingleheadband.Onecamerapointedstraightforward.Theothertwoweredirected30degreestotherightandleftofthecentre.Ahikerputthepackageonandthenhitthetrailsinaforestedpa

4、rtofSwitzerland.Overseveralweeks,thecamerasrecordedatotalof8hoursofvideocovering7kilometresoftrails.Theresearchersthendividedthevideointoindividualstillimagestotraintheneuralnetwork.Thenetworklearnedtoidentifywhatatraillookedlike.Theteamthentestedtheprogramwithunusedimagesfromth

5、evideo.Thecomputerdidaslightlybetterjobthanthepeoplehadincorrectlyclassifyingtheimages.Thismeantthedronewasreadytonavigatetherealworldonitsown.Giustiandhisteamtooktheirnow“smart”devicetoaforestwithtrailsthathadnotbeenusedinthedrone’straining.Itflewalongthepath,constantlyadjustin

6、gitsdirectionbasedontheimagescominginthroughitscamera.Thedronedidn’tperformaswellinreal-lifeasitdidinthelab,Giustiadmits.That’sbecausethedrone’scameratooklower-qualityimagesthanthecamerasthathadbeenusedtotrainit.Asaresult,theimagesbeingtakenbythedronelookeddifferent,heexplains.T

7、hisconfuseditsneuralnetwork.“It’sanexcitinguseforneuralnetworks,”saysChristopherRasmussen,acomputer-visionscientistwhowasnotinvolvedwiththestudy.“However,theproblemsfacedintheexperimentsshowthattherearestillsomeimportantissuestobeworkedout.”1.The“smart”dronehasbeencreatedinorder

8、tohelp　　　. A.findtravelerswhogetlostB.ensurethe