That's only true of lecture and your hypothesis about answering all potential questions is out of whack with how humans actually learn. Someone asking a questio

That's only true of lecture and your hypothesis about answering all potential questions is out of whack with how humans actually learn. Someone asking a question might just be a matter of not hearing something repeated enough times or maybe they just need to hear it phrased in a different way. Even with large classes, there are usually a bunch of TAs to try and provide more one-on-one help and often labs that exist solely to encourage questions to the TAs and reinforce material in a smaller setting.