阅读下面短文，选出最佳答案。

    Look, this is a photo of my family. There are 1   people in the photo — my father, my mother, my sister and I. We are  2in a park (公园). My father is playing basketball. Basketball is his favorite 3 . My mother is 4 a newspaper. The newspaper seems (好像) very  5  . She keeps a smile (微笑). I'm playing with my pet dog. I like  6 very much. My sister is playing the violin. She practices the violin  7 one hour every day. She can play it 8 and she is a member of the school  9   club. We are all  10a good time.

BCCDA       BDBBA   

关于物体运动的速度和加速度的关系，下列说法中正确的是（   ）