Beware of this organization (www.cau-edu.net.cn). They "borrow" the name of famous China Agricultural University (www.cau.edu.cn).
A friend of mine found out after applying for a teaching position there. This organization is not able to provide the necessary paperwork
for applying for your Z-Visa. German language teacher be especially aware. They are hunting for German native speakers.
More warnings about them on www.deutsch-lehren-china.org/?q=node/44 in German language.