why DoEs thE proFEssor sAy this
A、thE proFEssor is trying to mAkE somEthing ClEAr ABout thEir DiFFErEnCEs,
B、thE proFEssor is DEmonstrAting somE oF thE DiFFErEnCEs BEtwEEn rEsEArCh.
C、thE proFEssor is DisCussing thE rEsult oF DiFFErEnt mEthoDologiEs EmployE
D、
D、thE proFEssor is trying to ConDuCt ConClusivE rEsEArCh By himsEl