守法用法，是健全社会主义法制的一个重要环节。（   ）

人生意义在哪里？成就人生的关键因素是什么？班上决定以此为话题开展综合性学习，请阅读下面材料，完成问题。

       材料：八年前，刘宁以近650分的高分，成为四川凉山某县理科状元，考入中国科技大学。四年前，刘宁大学毕业，却没有找到理想的工作。他开始沉迷网络，四处流浪。大年初六的下午，一位好心人发现，一名年轻的流浪汉，已经连续三天在西南交大九里堤校区的长椅上过夜。他帮助联系到流浪汉的家人。第二天，刘国华从老家赶来，儿子却再次消失。刘宁称：“让我像大多数人一样结婚生子，挣钱养家，我觉得很无聊很没意思。”

（《成都商报》2014年2月11日）

    Tom is the son of a farm owner. One New Year's Day， when he was 15， his father 1 him to work on the farm for one year when he was free. Tom was 2 with his father's idea. "That isn't my job. I have 3 school work to do. "Hearing this， his father said， "I promise (许诺) to give you the best present if you 4 finish one year's work. "Tom thought for a while and 5.

       Starting one Saturday， the boy got up early and worked 6 until evening， just like any other farmer. Time passed quickly. Tom' s crops (庄稼) grew well. 7 the last day of the year， the father called his son to him. "I'm happy to see that you have worked very hard the whole year，" said the father.  " Now， tell me 8 you want "

    The boy smiled and showed his father a big piece of bread made from his wheat (小麦). "I've already got the 9 present. No pains， no gains. I think this is what you wanted 10 to know.” His father was quite pleased to hear that.

声音是由物体的 ____产生的；声音的传播需要 ____，物体振动的 ____越高，发出声音的音调越高；物体振动的 ____越大，发出声音的响度越大（远近相同）．