this CD is not new or different from the audio featured on the second edition DVDs bound into each book, the MP3 format allows for easy portability. Files can be transferred to an MP3 device, played on a computer, or played on some home or portable CD players. These easy-to-use audio files are ideal for: students who want extra practice; teachers who want to play the audio in class; and, language labs. Language labs that purchase a copy of any "Audio On the Go CD" will automatically receive rights to: post an electronic copy of the MP3 files on a secure (password-protected) network for use by current students and faculty at their institution; and loan the number of purchased copies to students.

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