So Special Chinese Listening Materials also are very helpful for
Chinese language learners to know their own listening ability progress.
If you can understand Normal Speed Chinese Speaking, that shows you can
communicate with non-teachers among Chinese people.
Go to I Love Chinese Listening Center
http://www.hellomandarin.com/ilovechinese/listening.html
Find Special Chinese Listening Materials in Practical Chinese and
Business Chinese
Please compare between two speeds.