{$mEDiAurl}
why DoEs thE proFEssor sAy this:A．BECAusE hE nEEDs to show how importAnt A worD is.
B、BECAusE hE is trying to introDuCE thE topiC oF thE lECturE.
C．BECAusE hE DoEs not wAnt thE stuDEnts to BEComE ConFusE
D、
D、BECAusE hE ExpECts thAt EvEryonE AlrEADy knows An iDE