①用火焰灼烧自来水龙头3分钟，然后打开水龙头放水5分钟，再用无菌的三角瓶接取1000毫升水样，盖好瓶塞．
②将漏斗和抽滤瓶固定好，用镊子夹住滤膜边缘，将水样倒入漏斗中，边抽滤、边加水．
③用镊子将滤膜取出、放在无菌平板上进行培养，观察并记录实验结果．
回答下列问题：
2015年10月13日，第五届全国道德模范座谈会在京召开。全国道德模范山东再增2人，房泽秋、朱彦夫当选，另外还有8人获得本届全国道德模范提名奖。开展全国道德模范评选活动（ ）
①有利于社会主义精神文明建设
②有利于促进校园文化建设
③有利于弘扬民族精神
④有利于提高青少年的思想道德素质
平均四边形的周长是56厘米，其中一条边长是10厘米．平行四边形另外三条边分别是多少厘米？
Rick is a good man．He makes birthday cakes in a shop．His cakes are great and have very good prices，so many people buy his cakes．He makes friends with lots of his customers(顾客)．They all like him very much．One evening．he wants to go home，but many of his old customers come in．Rick smiles(微笑)to them，“I am sorry．It is late today．If you need cakes，please come tomorrow．”One of them takes out a nice cake and says to him，“You make so many great cakes for us．This birthday cake is for you．Happy birthday, Rick．”
①供不应求使商品价格高于价值
②我国居民以享受资料消费为主
③家庭收入是消费的基础和前提
④商品是使用价值与价值的统一
