Quizlet
http://quizlet.com/27947542/new
Studystack
http://www.studystack.com/flashcard-1341080
Articles
http://www.colby.edu/~bknelson/SLC/articulos.php
http://www.studyspanish.com/practice/defart1.htm
Realidades
http://www.phschool.com/webcodes10/index.cfm?wcprefix=jcd&wcsuffix=0204&area=view
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