I teach mostly persuasive writing, so I don't suggest using a question as a hook. I suggest using: a quotation, a fact or statistic, or imagery.
Visit my TPT Store for a free downloadable poster [or use as a handout for your students to keep in their binders]. If you want to turn it into a poster, just print it out on 8.5 x 11" and then take it to Office Depot to have them blow it up to a 2' x 3' poster :)
Here's the one in my classroom! :-)
Enjoy your new, FREE, poster or handout!