阅读理解。 This is my first letter to you. I

      This is my first letter to you. I would like to tell you something about me. I'm a schoolgirl. My name
is Rose Green. I'm an American girl. I have short, straight blond hair. I'm the monitor (班长) of our class.
I study hard and well.
      I have a large family. There are seven people in it. Grandpa and Grandma are very old. I have a
13-year-old brother and a 9-year-old sister. Perhaps, you can ask:"How old are you?" Let me tell you, my
dear friend. I'm 11 years old. We all live together (在一起). How happy we are!
      My mother will give me a little dog on my birthday. I like animals very much. I often play with a dog or
a cat. My sister likes fish. But you can't play with a fish, can you?
      My father often tells us about your country. China is a large and beautiful country, isn't it?
      We can get to know each other soon. Please write back and tell me something about you and China. 
                                                                                                                                      Yours, 
                                                                                                                                      Rose Green

A. I B. My sister
C. My brother
D. My friend