thE primAry FunCtion oF thE pAssAgE As A wholE is to
A．inDiCAtE thE DirECtion thAt rEsEArCh into A pArtiCulAr physiCAl phEnomEnon shoulD tAkE
B．illustrAtE thE limitAtions oF Applying mAthEmAtiCs to CompliCAtED AstrophysiCAl phEnomEnA
C．ClAriFy thE DiFFErEnCEs BEtwEEn An olD ExplAnAtion oF A physiCAl phEnomEnon AnD A nEw moDEl oF it
D．introDuCE A nEw ExplAnAtion oF A physiCAl phEnomEnon
E．(E) ExplAin thE DiFFErEnCE BEtwEEn two rElAtED physiCAl phEnomEnA