DirECtions: in this sECtion, you will hEAr 8 short ConvErsAtions AnD 2 long ConvErsAtions.At thE EnD oF EACh ConvErsAtion, onE or morE quEstions will BE AskED ABout whAt wAs sAiD、Both thE ConvErsAtion AnD thE quEstions will BE spokEn only onCE.AFtEr EACh quEstion thErE will BE A pAusE.During thE pAusE, you mustrEAD thE Four ChoiCEs mArkEDA,B, C、AnDD, AnD DECiDE whiCh is thE BEst AnswEr. thEn mArk thE CorrEsponDing lEttEr onAnswEr shEEt 2 with A singlE linE through thE CEntrE. A.thE ClAss thought thE DEmonstrAtion wAs too ComplEx. B、too mAny stuDEnts showED up. C、thE proFEssor DiDn’t show up. D.thE proFEssor CAnCEllED it.