This is a photo of Mr Black's family. The man with glasses（眼镜）is Mr Black, the father. The woman is the mother. They have a son and a daughter. The son is behind（在……后面）Mr Black. His name is Jack. He's 14. Kate is Jack's sister. She is 12. Jack and Kate are in the same school, but they are in different（不同的）grades. Jack is in Grade Three and Kate's in Grade One. They are good students.

“数九”又称“冬九九”，是我国的一种传统民间节气。读图完成下列问题。