An Unforgettable ChallengeWhen I was ten years old, I began to chat with foreigners. But I was very shy. Gradually, I became more and more confident with foreigners’ help. The following year, I went to Yangzhou with two foreigners. I became their guide. First, we came into the Shouxi River. They wanted to look around the river by boat. I told them the price. Then we got into the boat. When we looked out at the sight, we all felt very beautiful. After that, they went to buy souvenirs. The sellers couldn’t speak English. Though it was very hard, I tried my best to listen to their words carefully and translate the sentences. They bought some souvenirs with my help. Next, we went to a small zoo, and we took some photos. There were not many animals. When we felt hungry, we went out and had lunch. After lunch, we visited some old houses. They learned more about Chinese history. This wasn’t only a big challenge but also an unforgettable challenge. This opportunity made me confident and brave. I hope I can catch many opportunities in the future, then I can speak English, because I think practice makes perfect.My DreamsI want to be a teacher when I listen to my teacher carefully. I think I can be a teacher when I grow up. I can help many students learn things well. I can play with my students, too. So we are good friends. I want to be a doctor when I see many doctors save their patients. To be a doctor is really great. I think I can be a doctor when I grow up. Then I can help many people out of danger. I will be the happiest girl in the world. I want to be a reporter when I watch TV every evening. We can get lots of important information from them. They make the world smaller and also make us happy. I would like to be a reporter when I grow up. And I can learn a lot about China and the other countries around the world. I can meet many superstars as well. I have lots of dreams. I think my dreams can come true one day, because there’s an old saying “where there is a will, there is a way.” The source of EnergyA summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is librated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of year. the nuclear energy is released at the Sun's center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun to be reemitted at slightly longer wavelengths. This radiation , in its turn is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat is emitted in such directions that after passing unhindered through interplanetary space, it hits the Earth.