4．
根据材料内容选择最佳答案。 Mr and Mrs Smith like China very much and they are in China with their children.
Mr Smith is 40 years old. He is a doctor at a big hospital in Beijing, China now. His wife, Mrs Smith is 35 years old. She is an English teacher in an international (国际的) school in Beijing. Their son, Mike, is ten years old now. He is a student at his mother's school. They like their school very much. Their daughter, Mary, is only one year old. It's cold today, so Mary is at home.
