{$mEDiAurl} whAt DoEs thE proFEssor mEAn whEn shE sAys this:
A、shE wAnts thE stuDEnts to spEAk up iF thEy Do not unDErstAnD、
B、shE DoEs not think thE ConCEpt is rElEvAnt to thE lECturE topi
C、
C、shE DoEs not wAnt to ExplAin thE ConCEpt in Any morE DEtAil.
D、shE thinks thE stuDEnts hAvE A gooD unDErstAnDing oF thE lECturE’s thEmE.