问题 单项选择题

在口腔条件正常时,设计右上第一前磨牙桥体的最合理的类型是

A.球形
B.鞍式
C.改良盖嵴式
D.卫生桥
E.盖嵴式

答案

参考答案:C

解析: 现在常用的是改良盖嵴式桥体,可将腭侧的接触区扩大到龈嵴顶,防止食物进入龈端,自洁作用好,舒适感好。

综合题
改错题

下列各句都有一处错误,找出并改正

1. Whose are the jeans? It's mine.                                                                                       

2. Are these cards yours? Yes, they're.                                                                               

3. Where're her trousers? Their're under the bed.                                                                 

4. Hi, Peter. Who's this basketball?                                                                                      

5. What colour are the oranges? They're oranges.                                                                 

6. There are a table and two chairs in the room.                                                                    

7. I don't have some new documents.                                                                                   

8. There is a "h" in the word "hair".                                                                                       

9. Ann's shoes is very nice.                                                                                                  

10. Do your friend have a walkman?