My friends and I often _________ after school.

A．walk to home

B．walks home

C．walk home

D．walking home

舵叶面积全部在舵杆轴线后，并设有许多舵钮支点的舵称为（）

A.平衡舵

B.半平衡舵

C.普通舵

D.半悬挂舵