---Tomorrow we’ll go to the zoo for our class trip. How will we get there?

--- You can get there         , but I’ll walk there.

A．by bus

B．by a bus

C．take a bus

D．with a bus

选磨的目的是为了（）。

A.消除正中牙合早接触

B.消除侧向牙合干扰

C.消除前伸牙合干扰

D.降低垂直距离

E.达到平衡牙合