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1. Advice ----www.justanswer.com
   Ask Your Question. Experts Answer You ASAP
   2007-03-07 to advice, answer, google by MarkTag.com
2. Answers.com - Teachers---www.teachers.answers.com
   answers专门为教师提供的工具和服务，很适合教学
   2005-08-30 to answer, teacher, 工具, 教学, 教师 by MarkTag.com

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