Lois doesn't know. At the moment the only active character who knows is Chloe ,since Lana left and Lex won't be joining the show. Green Arrow/Oliver Queen knows that Clark has some powers but doesn't know that he's an alien.
man Lois has changed a lot since season 4! do you remember her views on Clark leaving the farm after his graduation? she thought that it was crazy, and now she is pushing him into leaving :) could someone please explain the whole newspaper hierarchy? what's the bull pen? is that where Lois works? is that were Chloe worked? is that the same as a reporter?