科學(xué)60秒:樹木造就的現(xiàn)代河流

Rivers today have high muddy banks, sandbars and bends. But they didn’t always look that way. Because it wasn’t until the of tree-like plants, some 330 million years ago, that rivers were corr...

狗的贊歌

短文The best friend a man has in the world may turn against him and become his enemy. His son or daughter that he has reared with loving care may prove ungrateful. Those who are nearest and deare...

背誦美文——公共教育的角色變化

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...