A:轨道半径越大线速度越大
B:轨道半径越大线速度越小
C:轨道半径越大周期越大
D:轨道半径越大周期越小
阅读短文,判断对错。
Look at this photo(照片). This woman is my mother. She is 36. This man is my father. He is 37. This girl is my sister. She is 11. The little boy is me. I am 6. I love them. And they love me very much.