Two ways to avoid this. I connected teacher questioning to the "So what?" question and the levels of questioning that we talked about at the href="http://thebooksupplier.com/category/ap-nm/">APSI-NM workshops from last summer. There are a number of questions listed for teacher questioning that go beyond the "Okay, that's the right answer. Next question" mentality.
To further increase rigor, have students create the questions. I like this for inner/outer circle activities, personally. The Q-Matrix gives those kids who are struggling a place to start. Think about it this way: If students create the questions, it requires them to interact with the text in more than a "find the answer" kind of way.
I'll find a link to a clean copy of these and post it on a resource page. The PowerPoint this came from can be found on Lin Kuzmich's website.