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   Smiling is the best way of making friends.
   When I was thirteen 1 old, my father found a job in the city. So my family moved there. I also came to a 2 school near where we live. My old school was far away. At first, I did not know anyone in my class. I was very lonely3 I was afraid to make friends with my classmates. I4talk to anyone about my problem, and I didn’t want my parents to 5 me.
   Then one day, something good happened. I was sitting at my desk6 as usual while my classmates were talking happily with each other. At that moment, 7 came into the classroom. I didn’t know who he was. He passed me and then turned back. He looked 8 me and, without a word, smiled. Suddenly, I felt happy, lively and warm. That smile changed my life. I started to talk with the other classmates and made friends. Day by day, I became9 to everyone in my class.
   10 the smile, I have moved on to a new life. Now, I believe that the world is what you think it is. So smile at the world and it will smile back.

材料：东汉著名学者许慎在《说文解字》中记载：战国纷争的时代，各地田亩不同，车轨不同，法律不同，服饰不同，语言不同，文字不同。秦始皇二十六年（前221年）初并天下，确立了以郡县制为基础的新的专制主义政体，由中央政府主持，进行了“治驰道”的伟大工程，形成了通达全国的交通。作为“周定四极”，“经理宇内”的条件。据《史记秦始皇本纪》记载，秦王朝公开宣布的基本政策，就包括“车同轨，书同文”。汉武帝时，开通往“南夷”地区的通道，平治雁门地区交通险阻，打通西域道路，开凿漕渠……当时，海内成一体，富商大贾“周流天下”、“农工商交易之路通”；秦文化、齐鲁文化，楚文化大体完成了合流的历史过程

——摘编自张岂之主编《中国历史十五讲》