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.
Ten Level Chinese is a Chinese textbook series compiled for the international students taking long-term Chinese courses in China. Considering the different levels of the students, the different native language they speak, and the large amount of learning hours per week, the series is specially designed to help the Chinese beginners to develop their Chinese skills comprehensively and to cultivate their language and communication ability. Official Textbook used by Fudan University Shanghai (Level B Classes)
Ten Level Chinese Textbook published in 2012 by Beijing Language and Culture University Press. List contains 20 sections and 529 words. ISBN: 978-7-5619-1939-2