点P（1，2）关于直线y=1对称的点的坐标是____．

    I get up at 6:30 in the morning. Then I wash my face and brush my teeth. I go to school at 7:00. I go to school by bike. Classes begin at 7:30. We have six lessons every day. We have three lessons in the morning and three in the afternoon. Classes are over at 5:00. I get home at 5:15. We have dinner at 6:00. I go to bed at 9:00.

我国的卫星通信技术拥有自主知识产权，在世界处于领先地位．在北京发射的信号通过通信卫星会转到上海被接收．实现这种信号传递的是（　　）