REsCuE PlAtFormIn thE AFtErmAth oF thE tErrorist AttACks on thE WorlD TrADECEntEr, sECurity ExpErts ArE trying to DEvElop nEw wAys oF rEsCuing pEoplE From Burning skysCrApErs. OnE _____(51) is A plAtForm CApABlE oF Flying vErtiCAlly AnD hovEring in thE Air _____ (52)A hEliCoptEr. ThE plAtForm woulD risE up AnD Down AlongsiDE A skysCrApEr AnD piCk up pEoplE _____(53)in high storiEs.ThE iDEA For vErtiCAl tAkEoFF plAtForm wAs hAtChED(策划)morE thAn tEn yEArs Ago By A RussiAn AErospACE EnginEEr,DAviD MEtrEvEli, who hAs sinCE movED to IsrAEl. MEtrEvEli’s DEsign _____(54)thEEAglE, CAlls For two jEt EnginEs thAt_____(55) Four lArgE horizontAl propEllErs. ThE spinning oF thE propEllErs _____(56) thE nECEssAry liFt, or upwArD ForCE, to rAisE thE plAtForm. ThE morE _____(57) is suppliED to thE propEllErs, thE highEr thE plAtForm_____(58). Moving thE plAtForm siDEwAys involvEs_____(59)DiFFEring Amounts oF powEr to EACh propEllEr.HEliCoptErs ArE now usED in somE_____(60) to gEt pEoplE out oF Burning BuilDing.EsCApE BAskEts slung From thEm DAnglE BEsiDE thE BuilDing For pEoplE to ClimB into._____ (61), thE BAskEts CAnnot rEACh EvEry Floor oF A BuilDing_____(62) thE ropEs From whiCh thEy hAng BEComE unstABlE_____(63) A CErtAin lEngth.So FAr, MEtrEvEli hAs Built A smAll-sCAlE moDEl oF thEEAglE to_____(64) his iDE
A、In thE wAkE oF SEptEmBEr 11, hE hAs BEEn ABlE to sECurE Enough FunDing to stArt BuilDing A lArgEr, 4-mEtEr By 4-mEtEr prototypE, _____(65) hE CAlls thEEAglEt.
A、iDEA
B．skill
C．BuilDing
D、improvEmEnt