根据短文内容，选择正确答案。
Mike is seven years old now and begins(开始) to go to school. His father is a driver and takes him to school in his car. Mike studies very hard(努力地) and all his teachers like him very much.
One day, Miss White teaches the students to count from one to ten. Mike can count them. Miss White is happy and asks him, “How many people(人) are there(有) in your family, Mike?”
“Two, Miss White, ” Mike says.
“Who are they?”
“My father and mother.”
“Oh?” Miss White is surprised(吃惊地). She says, “But I think there are three people in your family—your father, your mother and you. Am I right?”
“No. I'm not at home now. I'm at school, you know!” Mike says.
城市游览，要求每个城市有一人游览，每人只游览一个城市，且这6人中甲、乙两人不去巴黎
游览，则不同的选择方案共有