Look, I don't have a problem with people trying to make a buck off of an app but I do have a problem with someone who has a minimal command of the language basically stealing money from people with this kind of poorly executed crap. Hire an editor to make your words make sense, Yuxin Chen. If I'd paid for this junk, I'd be screaming at Apple to refund my money. Your sample graphic actually says "Which one of the 3 farms is goat?"
It is clearly apparent that this steaming pile of code should never have been approved for sale in the App Store. I hope and expect Apple will remove it in short order.