In an early transcript/translation of the CVR that was "leaked" not long before "official" CVR transcripts were released, when the first stall warning sounded, one of the co-pilots said "What's that about?", as if he'd never even heard the word "stall" before. I remember seeing it on an Austrailian web site. I hope I can find it again and compare it to the "official" transcript. Anyway, if it's true, that would be an acknowledgement that, at least, one of the crew heard it.