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3中国互联网络信息中心(CNNIC).2009年中国青少年上网行为调查报告,20rb.4.
4Business office: http: //www.jhsph.edu/business office/Student Accounts and Business Services.htrnl.
5School Charge: http: //www.SchoolCharege.com/ School Charge instant online payment system for education!.html.