During the day we work and play; at night we sleep. Our bodies rest while we sleep. In the morning we are ready to work and play again. While we are asleep, our bodies grow most. Children who are tired usually need more sleep. We can get our lessons better and we feel better too when we have a good rest. Boys and girls who are eight or nine years old need ten hours of sleep every night. Our bodies need plenty of air when we sleep. If we do not get enough fresh air we'll feel tired when we wake up. While in bed we must not cover our heads. If we do, our lungs（肺）will not get enough fresh air. If we open our windows at night we can have plenty of fresh air. Cool air is better than warm air. Boys and girls who want to grow and be strong must get plenty of sleep.

无偿献血成为榕江市民新时尚（2014年05月08日 来源：人民网-贵州频道）当日上午，笔者在榕江县城大十字的献血车看到，来献血的人已经围得里外三层，车上已经挤满正在献血的市民。在献血现场由于报名的人太多，采血车里，已经挤满了踊跃献血的市民，彰显了榕城市民的文明程度和“人人为我，我为人人”的博爱情怀。（备注：献血要求18周岁以上，身体健康） 

①图片是研究古代戏曲艺术的有利史料

②傩戏蕴含着中国古代戏曲的萌芽

③杂剧融合了汉调、秦腔等形式

④三幅图片体现了时代的先后顺序

①货币政策是实现创新驱动发展的重要手段     ②我国积极提高传统产业的内在竞争力

③国家通过增加财政支出来促进经济平稳运行    ④国家财政可以促进资源合理配置

国土资源部在广西西北部乐业县进行土地资源调查时，发现了一处世界地质奇观——乐业天坑群。在20平方千米范围内已发现有天坑28个。在全世界13个超大型天坑中，分布在乐业的就有7个，其代表是大石围，如图所示。大石围底部发现有两条宽7～13米的地下暗河，是广西目前流量最大、流程最远的地下暗河之一。读图，完成以下问题。