—How's this pink evening dress? I wear it to the party _______ shall I choose that white one?

—They both look beautiful, but I think your blue dress is suitable.

A．Must; or; fairly

B．May; and; much　

C．Shall; and; very

D．Shall; or; more 

关于生物学宽度正确的是（）

A.龈沟底与牙槽嵴顶之间的恒定距离约2mm

B.龈沟底与牙槽嵴顶之间的距离约2mm，其改变可反映牙周状况

C.牙周炎时牙槽骨水平吸收，生物学宽度增大

D.牙周萎缩时生物学宽度变小

E.随年龄增长上皮附着根向迁移，生物学宽度变小