如图，四棱锥P﹣ABC中，PA⊥平面ABCD，AD∥BC，AB=AD=AC=3，PA=BC=4，M为线段AD上一点，AM=2MD，N为PC的中点．

画出图中的BC的入射光线和AO的折射光线．

中国科技事业实现了一次次的飞跃令世界惊叹和赞许，如：2014年8月9日，我国在酒泉卫星发射中心成功将遥感卫星二十号送入太空。“天河二号”超级计算机登上世界超算之巅、“嫦娥三号”携“玉兔”成功落月……（   ）

①这表明我国科技创新能力日益增强                         ②这是广大科技工作者艰苦奋斗、自主创新的结果

③表明我国科技总体水平已达到世界先进水平            ④这是大力实施科教兴国和人才强国战略的结果

Red Star Restaurant
The biggest and busiest restaurant in Jinan is seeking 20 waiters who have relevant (相关的) experiences in high-grade restaurants. About ¥800—1,500 per month.
Red Star Restaurant is located at 66 on Park Street.
Our phone number is 0531-8278-4560.
3 People wanted
Need 3 people who would like to work 4 evenings per week showing films. Earn $300 per week possibly. Call 469-867-6042.
Baby-sitter wanted
For a year. 3 days a week. Some flexible (灵活的) hours required.
Knowledge: above senior middle school.
Call 0431-478-9971.

如果一次函数的图象经过点A（1，-1），那么____，该函数图象与轴的交点坐标是_____，与轴的交点坐标是_____