阅读理解 When I was 13 years old, a boy gave me an important gift. It was a smile. It was the early autumn of my first year at a junior high school, and my old school was far away. As a result, no one knew who I was. I was very lonely, and afraid to make friends with anyone. Every time I heard the other students talking and laughing, I felt that my heart broke. I couldn't talk to anyone about my problem, and I didn't want my parents to worry about me. Then one day, my classmates talked happily with their friends, but I sat at my desk unhappily as usual. At that moment, a boy came into the classroom. I didn't know who he was. He passed me and turned back. He looked at me and without a word, smiled. Suddenly(突然), I felt the touch of something bright and friendly. It made me feel happy, lively and warm. That smile changed my life. I started to talk with the other students and made friends. Day by day, I became closer to everyone in my class. The boy with the lucky smile has become my best friend now. One day, I asked him why he smiled, but he couldn't remember smiling at me! It doesn't matter because all the dark days have gone. Now I believe that the world is what you think it is. If you think you are lonely, you might always be alone. So smile at the world and it will smile back.（1）Why was the smile an important gift? A．Because the writer's old school was far away.B．Because the smile didn't mean anything to the boy.C．Because the writer didn't know who the boy was.D．Because it made the writer feel happy, lively and warm.（2）The writer couldn't talk to anyone in her new school about her problem because .A．she was always unhappyB．she didn't have any friends hereC．she was in the first year at a junior high schoolD．she didn't want her parents to worry about her（3）How did the smile change her life? A．She started to make friends.B．She and the boy became best friends.C．Her parents didn't worry about her any more.D．She realized that she was lonely.（4）Where does she now think her feeling of unhappiness came from? A．From her old school.B．From her parents.C．From herself.D．From her classmates in the new school.