Do you know about the sun, the moon or the earth? Let me tell you. The sun is a star. It is big and bright. It is hot. And it gives us light and heat(光和热量). We need the sun. Animals and plants both need it. The moon is a satellite(卫星). It goes around (围绕...转) the earth. On the moon there is no water or air(空气). So no people live on the moon. The earth is a planet(行星). It goes around the sun. It is our home. We live on the earth. So we should love our home-the earth.

    In the morning and evening the sun rises or goes down. Our shadow is long. At noon the sun is high in the sky. Our shadow is short. If(如果)it is cloudy or rainy, we can't see our shadow. At night if there is light(光), we can see our shadow, too. You go, the shadow goes. You run, the shadow runs. But you speak, the shadow can't speak. We can't hear the shadow. We only see the shadow. Some little children don't know what the shadow is. They go, the shadows go. They are very afraid. In fact the shadows are ourselves.