阅读下列材料，根据阅读内容选择正确答案，并将答案写在题号前。This s a picture of Mr. Green’s family. The man is Mr. Green. He is the father. He teaches English in a school. The woman is the mother. She is a doctor. They have a son and a daughter. The son is behind the mother. His name is Victor, He is fourteen. Cindy is Victor’s sister. She is twelve. Victor and Cindy are in the same school. But they are in different grades. Victor is in Grade 9 and Cindy is in Grade 7. They are good students. They can speak Chinese. They like playing the piano and they can play basketball well. ( ) 16. Mr. and Mrs. Green have _____ children. A. one B. two C. three D. four( ) 17. Victor is Cindy’s _____. A. classmate B. friend C. sister D. brother( ) 18. ____ name is Victor. A．Cindy’s sister’s B. Mrs. Green’s daughter’s C. Mr. Green’s son’s D. Mr. Green’s( ) 19. Victor and Cindy are in the same _____.A. grade B. class C. school D. row( ) 20. Victor’s father is a _____. A. teacher B. doctor C. player D. worker