—It' s sunny today, Daddy, How about going swimming with me?

—_______. Let's ask your mommy to go with us. [ ]

A. Don't worry

B. Never mind

C. Not at all

D. Good idea

飞机在控制操纵后将从原来的位置移动得更远，则表明飞机具有（）.

A.负静稳定性

B.正静稳定性

C.负动稳定性