Imagine life as a game ____ you are playing with five balls. You name them---work, family, health, friends and spirit.

A．where

B．that

C．as

D．which

无牙颌牙槽嵴吸收的方向主要与骨质的致密度直接相关，上、下颌牙槽嵴吸收的方向是

A．上颌吸收的方向向上、向内；下颌向下、向外

B．上颌吸收的方向向上、向外；下颌向下、向外

C．上颌吸收的方向向上、向内；下颌向下、向内

D．上颌吸收的方向向下、向外；下颌向上、向外

E．上颌吸收的方向向上、向外；下颌向下、向内