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.

中国民间俗语云：“人在做，天在看。”根据中国古代主流思想发展历程判断，该俗语的出现不会早于（     ）

在驰名中外的北京天坛里，有三处堪称奇观的声学建筑：回音壁、三音石和圜丘．当游客在圜丘顶层的天心石上说话时，听到的声音格外响亮，这是建筑师利用声音的反射，使 ____与原声混在一起，声音得到加强造成的音响效果．