阅读理解，根据短文的意思，选择最合适的答案。
    Daming and his father went to the Great Wall at the weekend.It is very old and very long. They went there at ten o'clock in the morning. They went by bus to Badaling. Then they walked for one hour. There were lots of people. They took photos of the mountains. Daming took a photo of his father.