根据短文内容的理解，选择正确答案。   

    Mary is a girl. She is a middle school student. She is thirteen. She is in Class Three, Grade Two.

    There is a big picture in Mary's bedroom. It's the picture of the family. Mary's mother is a teacher of Chinese. She is a very good teacher. Mary's father is a worker. There is a big red flower on his black coat. He is at work from Tuesday to Sunday. Mary's brother is near her mother. He is a middle school student, too. He is fourteen. He is in Grade Three.

    Mary and her brother like books. They like school. They study hard. They are good students.