URL	Title	Id
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_part2_types_of_galaxies.html	Chapter 1. Types of Galaxies	51414136b11c0f901b000002
http://digfir-published.macmillanusa.com/astro_interactive_exercise/ie_part2_types_of_galaxies_dlap.xml	DLAP questions	51414136b11c0f901b000002