根据短文内容，完成下列小题。

    During the summer holidays there will be a new schedule(时间表).

    Changes for meal and library service hours and for bus schedules will be shown on the wall outside the dining room. Weekly film and concert schedules, which are being made, will be shown each Wednesday outside the library.

    Buses to the town center will leave the North Beijing every hour on the half during the day. The dining room will serve three meals a day from 7:00 a.m. to 7:00 p.m. during the weekdays and two meals from noon to 7:00 p.m on weekends. The library will continue its usual hours during the weekdays, but have shorter hours on Saturdays and Sundays. The weekend hours are from noon to 5:00 p.m.

    All students who want to use the library borrowing service must have a new summer card. This announcement(通知) will also be shown in the next week's student newspaper.

不计质量的弹簧，圆弧AB部分光滑，半径为R，平面BC部分粗糙，长为l，C点右方的平面光滑．滑块质量为m，从圆弧最高处A无初速下滑（如图），与弹簧相接触并压缩弹簧，最后又返回到B相对于车静止．求：

    Teenagers can't afford to buy expensive gifts. So what do you do if you want to give gifts to the important people in your life? In fact, you don't have to spend much money on holiday gifts. There are many cheap ways to do that. Here are some make-it-yourself gift ideas to try:

To your mom and dad:

    You can clean the room, sing a song or write a letter to your mom and dad. You could also draw a picture if you like.

To your teacher:

    Sometimes students put their pocket money together and buy a teacher a holiday gift. Some kids would like to give their own gifts. You can send a nice card with the words of thanks inside. You might even write down the favorite things you've learned in the teacher's class this year. It will make the teacher feel happy.

To the kids who need a friend:

    The holidays are a good time to think about people who are lonely. Maybe there is someone in your class who doesn't seem to have any friends. Try to do something for this person. It could be giving a Christmas card or just chatting with him or her. It's a small thing, but it could mean a lot to him or her.