Mary is four years old. She likes to ask questions. Her questions are often funny.

One day Mary goes to see her uncle with her father. Her uncle lives in another city. The city isn't near their city, so they take a bus to go there.

After many hours, they get to Mary's uncle's city. He is very happy to see them. The next morning, Mary's uncle takes her and her father out and shows them around(带领他们参观)。“Look at that big house,” says her uncle. “ It's the oldest(最古老的) house in the city.” “How old is it?” her father asks. “It is about 2100 years old,” her uncle answers.“How can that be?” Mary says. “It's only 2015 this year!”

根据短文内容，选择正确答案。

    Kyle walked up and down as he waited for his turn at the back stage. This would be his most important piano performance yet. At ten years old, he was the youngest performer in the Christmas concert. Although his teacher Ms. Neal said he was good enough at the song he would play, he still practiced it more than 30 times that week. When he closed his eyes at night, the music played over and over again in his mind

    Now, the day finally arrived, but Kyle was not sure he was ready. He kicked a small ball which was picked up from a Christmas tree, and then looked himself in a mirror—trying to make his bow tie more smooth and beautiful. He thought of his mom who bought him the new suit with this bow tie. He would make her feel proud of him. He noticed that his hands were shaking. How could he play the notes of the song if his hands were shaking? He took a deep breath and tried to calm down, but his hands shook more.

At this time, Ms. Neal walked up to speak to him. “I have something for you,” she said, putting a smooth black stone into Kyle's hand. “It's a special stone. There's no other one like it in the world. You've practiced so much, so you don't need anything else.”

    The stage lights reflected on it. “Thank you.” Kyle said.

When Kyle's name was called, he rubbed the stone, stepped onto the stage, and played better than ever. After his performance, he noticed that Ms. Neal had a whole bag of black stones. “Why did you say this one was so special?” he asked.

His teacher smiled, “Like your talent, it is special because it belongs only to you.''

    Last year, I went to Beijing Qizhi Special Education School for community service（社区服务）.Before we took the bus, my friend asked me a question, "Why are you here?" I did not know how to answer the question.

    The school was not far from my school, but it looked like it was in a different world. A group of children were waiting for us. A boy walked toward me. He held my hands and pulled me to the ground. I kissed the earth and tasted nature.

    I could not understand what he was doing at first, then I was very angry. Though I was very angry, I controlled my anger.

    A teacher stopped this awkward（尴尬的）silence when she shouted at the boy. "What are you doing right here, right now?" she said. "You will never see your mom again if you keep doing this. Now, say sorry!" "Sorry," he cried fearfully and nervously. I said nothing, but I realized something about this child. After lunch I asked the teacher for information about the child's parents.

    She said that the child was very different from other students because of an illness. His family could not afford to treat him. He needed the kindness of his family, but they had abandoned him. So he depended on the support from the teachers and community service workers like us.

    I suddenly realized I could answer the question my friend asked me at the beginning of the day.

    Community service workers help others and make everyone feel better. There are so many people in the world that need help. Playing with lonely children may not make a big difference. But it can light a corner in the children's hearts, making them know they are loved by people.

    Some people are sharing their experience of being a volunteer. Now let's have a look.