Haveyoueverseenharmfulrobotsrefusetodienomatterhowfiercelypeoplefightback?Asisknownitisalwaysthecaseinsomeofthescariestsciencefiction.Nowsciencefictionhaschangedintosciencefact.Forthefirsttime

　　Haveyoueverseenharmfulrobotsrefusetodienomatterhowfiercelypeoplefightback?Asisknownitisalwaysthecaseinsomeofthescariestsciencefiction.

　　Nowsciencefictionhaschangedintosciencefact.Forthefirsttimeresearchershavecreatedaroboticmachinethatcanstandabeatingandkeeponwalking.DevelopedbyscientistsfromCornellUniversityandtheUniversityofVermontthenewrobotlookslikeaspiderwithfourlegs.

　　Untilnoweventhemostadvancedrobotwasalmostcertaintobreakdownwhendamaged.That’sbecauseitsinsidecomputersimplydoesn’tknowhowtooperatethemachineafteritsshapehaschanged.

　　Togetaroundthisproblemthespideryrobot’sdevelopersequippedtheirinventionwitheightmotorsandtwosensorsthatreadhowthemachineistilting(倾斜).Themotorsandsensorsallprovideelectricalsignalstothemachine’ssoftware.

　　Usingthisinformationthesystemfollowsanewproceduretofigureoutthemachine’sshapeatanygivenmoment.Theprogramchoosesfromamong100000possiblearrangementsofparts.

　　Fromtherethecomputerconsidersawidevarietyofpossiblenextstepsanditcalculateshowbesttomovetherobotforwardthelongestpossibledistancebeforetryingtomoveagain.

　　“Thenewstrategyisamajoradvanceinrobotics”ProfessorSkehanascientistinCornellUniversitysays“andit’sfarfromscary”.Thetechnologymaysomedayhelpresearcherscreatebetterartificialarmsandlegsthatgivenewfreedomtopeoplewholackthem.Thenewknowledgemightalsohelpscientistsunderstandhowpeopleandanimalsfigureouttheirownsenseofplaceinspace.

　　“Designingrobotsthatcanadapttochangingenvironmentsandcancompensate(补偿)fordamagehasbeenadifficultproblem”saysneuroscientistOlafSpornsofIndianaUniversityinBloomington.“Thisworkprovidesanewwaytowardsolvingthisimportantproblem.”

　　74.What’sthemostimportantcharacteristicofthenewrobot?

　　A.Itsshapeislikeaspiderwithfourlegs.

　　B.Itcanrepairitselfandmoveagainafterdamaged.

　　C.Itisoperatedbyitsinsidecomputer.

　　D.Itiscertaintochangethedirectionwhendamaged.

　　75.Itcanbelearntfromthepassagethat________.

　　A.ani