Being safe in your everyday life needs knowledge. If you remember the following information，your life will be much safer.
● Always notice the environment around you. You shouldn't walk alone outside late at night. Make sure where the public phones are. If anything dangerous happens，you can find them easily.
●Your bag should be carried towards the front of your body instead of putting it on your back。When a bus is full of people，it is easy enough for a thief to take away the things in the bag on your back.
●If you are followed by someone you don’t know, cross the street and go to the other way, let the person understand that you know he or she is after you. Next，don't go home at once. You are safer in the street than you are alone in your home or in a lift.
●If you have to take a bus to a place far away, try to get to the stop a few minutes earlier before the bus leaves. This stops other people from studying you. On the bus，don't sit alone. Sit behind the driver or other people. Don't sleep.

材料一：五代十国时期，地处“大漠之间，多寒多风，畜牧畋渔以食，皮毛以衣，转徙随城之境，时车马为家”的契丹族在北方崛起，当时的契丹实行的还是游牧民族的部族制，事简职专，官制朴实。契丹从后晋石敬瑭手中夺取幽云十六州，俘获了大量以农业文化为主的汉人，为了发挥汉人所长，史载“至于太宗，兼制中国，官分南北，以国制治契丹，以汉制待汉人。国制简朴，汉制则沿名之风固存也”。至此，南北双轨制运行下的“蕃汉分治”便以国策确立下来，并为有辽一代所沿用。

材料二：有辽一代，北方草原树海中出现了许多农田区；银币成为法币；北部边疆得到开发和巩固。宋辽时期，我国的封建制度开始向边疆地区传播。辽朝在汉族先进文化的浸润下，也开始向封建社会过渡。

——摘自田泽斌《中国古代史》

I sit on the chair and talk 　　　 my mother.

北大教授张千帆等30位专家学者联名向国务院、教育部及北京、上海、广州三地的教育部门递交了《进城务工人员随迁子女在就读地参加升学考试的建议方案》，对随迁子女的认定条件、父母条件、政策落实时间等方面提出建议。这是公民通过（    ）

老婆婆哭了

    宇宙博士邀请了每个星球来家里做客，有太阳公公，有月亮姐姐，还有火星哥哥……忽然，来了个老婆婆。她的头发几乎掉光了，眼睛也瞎了，衣服破破烂烂的，还有几个小洞。

    大家奇怪地问：“你是谁？”老婆婆说：“我是地球呀！”

    客人们大吃一惊。太阳公公问：“你茂密的头发呢？”老婆婆哭着回答：“人类一直砍伐森林，所以我的头发就没了。”月亮姐姐问：“你的衣服怎么破了？”老婆婆哭诉道：“人类不断排放废气，破坏了大气层，我的衣服上就有了那么多洞。”火星哥哥问：“那你的眼睛又是怎么瞎的？”老婆婆更伤心了：“人类不断朝河里排放废水，乱扔垃圾，所以我的眼睛就瞎了。”