根据上下文补全对话    

Jack: Hello!    1    

Tom: Sure. Wait a minute.

Mary: Hello.    2     

Jack: This is Jack speaking. Mary, my mother is ill.  So I must stay at home to look after her.

Mary:     3     What can I do for you?

Jack: Would you like to tell Miss Gao that I can't go to school this afternoon?

Mary:     4    

Jack: Thanks.

Mary:     5    

1.           2.             3.             4.             5.            

在判断某物体是运动还是静止时，如选择不同的两个参照物，得出结果（　　）

A．一定相同

B．一个是静止的，则另一个也可能是静止

C．一定不相同

D．一个是运动的，则另一个是静止的