how DoEs A mAglEv opErAtE
A．it usEs nuClEAr EnErgy.
B．it rEsts on A Cushion oF prEssurizED Air.
C．it FliEs ovEr mAgnEtiCAlly ACtivAtED trACks.
D．it usEs A DEviCE similAr to A jEt EnginE.