“ Dreams may be more important than sleep. We all need to dream.” some scientists say. Dreams take up about one quarter of our sleeping time. People have several dreams each night.
     Dreams are like short films. They are usually in color. Some dreams are like old films. They come up over and over again. That may be the dreamer worrying about something. Dreaming may be a way of trying to find an answer.
     Some people get new ideas about their work from dreams. They may have been thinking about their work all day. These thoughts can carry over into dreams.
     Too much dreaming can be harmful. The more we sleep,the longer we dream. The mind is still at work when we dream. That is why we may have a long sleep and still wake up tired.

围绕上述栏目，叙说初中阶段你的收获。

包含要素：列举新的机会、新的挑战；对学习的认识；如何呵护友谊？

如果方程 与方程 有一个公共根是3，求 的值，并分别求出两个方程的另一个根．

大家对电视都已十分熟悉，可以说每天都离不开．不同的电视台占有不同的频道，频道实际上就是预先设计好的频率，每一个频道都有固定的发射（接收）频率．过去的黑白电视时代只有12个频道，现在发展到有90多个预选频道，新型的电视可以自动搜索频道使每一台节目都有最佳的效果．

如图，⊙O的半径是2，AB是⊙O的弦，点P是弦AB上的动点，且1≤OP≤2，则弦AB所对的圆周角的度数是（　　）