问题 单项选择题 A3/A4型题

患者,女,38岁,缺失,近远中间隙可,咬合正常。牙体,牙周组织健康。残冠,无松动,X线检查示已行根管治疗,根长度可。

欲加强固位体的固位力,无效的方法是()。

A.采用多根管不平行桩设计

B.适当减小牙体预备聚合度

C.增加辅助固位形

D.制备龈上边缘

E.增加固位体密合度

答案

参考答案:D

解析:

制备龈下边缘可以增大固位体的固位面积,从而增加固位;龈上边缘没有增加固位的作用。

阅读理解

Danny was just tired about the way things were going. His mom came to the school and went on and on about Rick Jackson. It seemed that she would never stop talking. "Somebody's got to stop that boy!" she was shouting. "Rick's troubling everybody in the neighborhood. And he loves to pick on little boys like Danny. "

Mrs. Green, Danny's teacher, was concerned (担心) a lot."I didn't know that Danny was being picked on," she answered."He's never said anything about this to me!"Mrs. Green looked at Danny."How long has this been going on?" she asked. Danny could only shake his head and look at the floor. He knew if he said a word about this, he would have trouble after school.

Danny hadn't said anything about the problem because he wanted to do things with the boys in the neighborhood. After all, most of them were nice to him. He hated to leave the gang just because of Rick. Maybe the time had come to find new friends. He felt it hard to make up his mind.

小题1:We learn from the reading that ___________,

A. Danny was not a good student

B. Danny's mother was quite worried about Danny

C. Danny wanted to get away from Rick

小题2:When Danny’s mother came for Mrs. Green, Mrs. Green __________.

A. was still in the dark about it

B. said sorry to Danny's mother

C. called Rick in to explain it.

小题3:Danny now _________.

A. was tired of the school and his friends

B. was always alone to stay away from Rick

C. was not sure what he should to do with the problem

小题4:Danny didn't say anything about the matter to Mrs. Green because__________.

A. she had known it

B. The other boys would tell her

C. He didn't want to be in trouble

小题5:The word ‘gang’ in the reading means __________.

A. a place for boys to play games

B. a group of young people

C. a school bus for children to and from school

单项选择题