well... thats what a reading is. They don't need to have lines memorized, they usually sit in chairs, sometimes stand when it is their turn to speak, and someone else just reads the stage directions. It's an early stage of a show, no blocking is done or anything like that.
<-- Gwen Stewart, SOLoist at the last show of RENT
Cages or wings?
Which do you prefer?
Ask the birds.
Fear or love, baby?
Don't say the answer
Actions speak louder than words.
(Tick, Tick... BOOM!)