(CNN 학습용 10분 뉴스) CNN Student News / 2012-9-13

As America pays tribute to the victims of the 9/11 terrorist attacks, we report on some of Tuesday's memorial ceremonies from around the country. We also explore some potential culprits behind the weak U.S. economic recovery. Plus, we examine a new list of the world's most endangered species, and we hear the story of a CNN Hero who helps dog owners through financial struggles.