【单选题】
·you will hEAr A progrAm ABout BusinEss.
·For EACh quEstion (23-30), mArk onE lEttErA,B、orC、For thE CorrECt AnswEr.
·AFtEr you hAvE listEnED onCE, rEplAy thE rECorDing.
whAt is thE mAin iDEA oF this ArtiClEA、As goEs gEnErAl motors, so goEs thE nAtionB、As goEs iBm, so goEs thE mArkEtC、thE rEAson why shArEs oF ComputEr CompAniEs FAll