Don't filter them. The ads are ordered by eCPM not by CPC, so don't worry about that, focus on your job which is to increase number of ad impressions.
use the google adword keyword tool to filter the keywords with low cpc and then just make sure you don't use those keywords in your site. Use that keyword repeatedly in your site with a high cpc.
After you type in your keyword or phrase, press search Then go to the column section at the bottom right and then click "approximate CPC Value" Now you are done. No its not lol
i don't think its possible. cause Google Changes the ads according to the rate of visitors, bounce rate your quality of contents etc. so i think you can't control the ads. thanks
Last time I filtered low ads, it is useless, I got my earning down. If you filter low ads and Google don't have ads stock for your niche, you will display public service ads.. ;-)