Kennewick Man was laid parallel to the river, on his back -- his legs extended, arms at his sides and palms resting on the earth, Owsley said.The skeleton was discovered in 1996 in the Columbia River.

• 知识测验：根据学生的年级，可以对每一科的主要知识点进行检测，通过在线答题，提交并打分的形式，通过结果可以反映学生目前知识点掌握情况。