A lot of people in our country take a nap after lunch, so do my classmates.____ (recent) I have conducted a survey on____ (take) a nap after lunch among my classmates. Most of them are in the habit of sleeping for____while at noon as they believe it does good to them. The majority prefer____do so around 12:30 and the nap usually lasts for about 30 minutes. They often ____ (choice) to sleep at home instead of in their classroom ____dormitory.

    Hopefully, the result of my survey can draw the attention of our parents and school. Since most students are in need of a nap, proper____ (arrange) should be made so that students can have a good rest after a whole ____ (morning) hard work. Students should not be____ (ask) to do extra work during this period of time. After all , having a nap after lunch, one can feel ____(refresh) and energetic enough to study more efficiently in the afternoon.

（填“够”“不够”）。如果不够的话，还差____张车票。

如图所示，沿水平方向的介质中的部分质点，每相邻两质点的距离相等，其中O为波源，设波源的振动周期为T，从波源通过平衡位置竖直向下振动开始计时，经 质点1开始振动，则下列关于质点的振动和介质中的波的说法中正确的是 (　　)