Looks like the Great Firewall or something like it is preventing you from completely loading www.skritter.com because it is hosted on Google App Engine, which is periodically blocked. Try instead our mirror:
This might also be caused by an internet filter, such as SafeEyes. If you have such a filter installed, try adding appspot.com to the list of allowed domains.
This book combines listening and speaking trainings. Unlike the old skill guide books, where listening and speaking are independent, listening and speaking trainings are actually in a single process, with different emphasis. This book integrates the two facets into a program, in which both skills are enhanced, thus to harmonize the developments of teaching process and learners' language skills.
汉语听说教程中级上册
intermediate Chinese Listening and Speaking Course I
北京大学出版社
Peking University Press
ISBN: 978-7-301-07906-5