Repeat or copy part of the text :
your public is not there to get some extract of the paper: they could do
it themselves. What they want is a second way to look at the ideas presented
into the paper.
Only and strictly read a text (except if you are really good at loud reading)
Follow entirely the structure of the paper :
you won't have enough time
you'll won't be able to point out the interesting bits of the paper
you'll make your public fall asleep, because sometime, things that
have to be written to make a good paper, are not interesting to be said.