First impressions are the most lasting. After all, you never get _______ second chance to make

_______ first impression.[ ]

A. a; the          

B. the; the          

C. a; a              

D. the; a

牙列缺失后，以下口腔硬软组织变化不正确的是（）

A.上颌骨向外吸收

B.口角下垂

C.舌系带附丽相对增高

D.口底变浅

E.舌变大