how google knows that my landing page got affiliat link , is it accurate , and how can avoid that ? any help pleas
yes, they're generally accurate, some people say you can get round it with re-directs, but google's going on an anti-affiliate rampage at the moment with regards to adwords and they're manually reviewing a lot of LPs - in which case you won't do well. My advice would be to try adcenter or yahoo if you want to use sponsored links ot promote affiliate items
The current rash of bans and ban warnings is not so much just for using affiliate links, it's the type of affiliate site you are linking to. See this important thread for more info. ESPECIALLY READ POST #12 http://forums.digitalpoint.com/showthread.php?t=1511270
No, it's all kinds of affiliate sites selling all kinds of things: electronics, books, watches, you name it. Not just get rich quick schemes.
they do that because Google loves content. they don't love "Bridge" sites that contains only affiliate links. if you will add to your site/landing page relevant content and services which will improve your visitor's experience - you won't have a problem.