Talking to other people is NOT allowed. The proctor could mistake your reading for talking either in person or over the camera that they use to monitor you.
It's up to the proctor if they want to do something about it or not.
I would recommend learning to read without doing so audibly. Reading aloud and subvocalizations are considered "bad habits" that slow you down! See this:
http://www.irisreading.com/speed-reading/how-to-read-faster-by-reducing-subvocalization/ Reading out loud slows you down even more.