自制肥皂 (2)
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价格的定义
价格的定义The Definition of "Price" Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed ...
背诵美文——公共教育的角色变化
Changing Roles of Public EducationOne of the most important social developments that helped to make possible a shift in thinking about the role of public educatio...
照亮黑暗角落的光芒
短文Shining Light in Dark Corners "Dr.Papaderos, what is the meaning of life?" The usual laughter followed, and people stirred to go. Papaderos held up his hand a...
青年在网络社区的危险行为 (2)
提示:Richard Blumenthal,Roy Cooper,Noelle TalleyIn the United States, about half of all young people use social networking sites like MySpace and Facebook. Doctor Dimitri Christakis at Seattle...