下列哪项不是覆、覆盖的生理意义（）

A.扩大咀嚼面积

B.减少侧方运动时的咬合干扰

C.有利于提高咀嚼效率

D.保护唇颊侧软组织

E.保护舌的功能

The view menu is used to display the document in one of several view modes. The view mode “______” makes it easy to look at the structure of a document.

A．Normal

B．Web Layout

C．Outline

D．Print Layout