Thankx Alex,
And I like to ask, if I like to PR a book that I already familiar, or I read that before, do I need to preview the book first ?
If I preview one book without writing down 'key word', will it affect the result of PR ? And almost everytime I do PR, some thing else will appeared in my mind,like music,song,etc, and it affect me from paying attention to PR, anything can I do to prevent it from happening ? Or it was normal ?
Thankx again, Alex, I really don't know what else can I say to to let you know I'm really appreciates your help, Thabnk you.
Edgard 
