—What do we need to buy?    

—We need _____.[ ]

A. two carton of milk  

B. two cartons of milks  

C. two cartons of milk  

D. two carton of milks

一患者上颌局部义齿修复。义齿初戴时，发现上腭后部弯制的腭杆离开腭黏膜2mm，处理办法是（）.

A.取下腭杆

B.腭杆组织面做缓冲

C.腭杆组织面加自凝树脂重衬

D.不做任何处理

E.取下腭杆后，戴义齿取印模，在模型上重新加腭杆