{{B}}sEt 6BiologyCArDiAC musClE{{/B}}
why DoEs thE proFEssor sAy this:A．to introDuCE thE topiC oF CArDiAC musClE
B．to FinD out how muCh thE stuDEnts AlrEADy know
C、to tEll thE stuDEnts whAt will BE on thE nExt tEst
D．to point out A quEstion thAt hAs no ClEAr AnswEr