It is a very nice Sunday morning. Ann and her mother are on a big bus. There are many people on it. Some are from America. Some are from England and Japan. They are all friends. They are going to the Great Wall. There are two Chinese on the bus, too. They are a young man and a young woman. They can speak English. The young man is the driver of the bus. The woman is talking about the Great Wall. The others are all listening to her. They all like the Great Wall. The people on the bus are talking in    _   .
Chinese English Putonghua Baihua