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PFM桥的桥体是恢复缺失牙形态、功能、美观的人造牙部分。决定桥体形态的因素包括美观、发音功能、面形态以及基底面形态的恢复

PFM桥基底面制作错误的是（）。

A.基底面与牙槽黏膜接触面积不能过大

B.基底面不能压迫黏膜

C.远近中及舌侧邻间隙应尽量开阔

D.基底面尽可能呈凹面形

E.基底面形态应易于清洁

答案

参考答案：D

完形填空
完形填空。
     It snowed again.My seventh Christmas was round the corner.I dreamed of getting the present from
Father Christmas until my elder sister dropped the bomb. "There is no Father Christmas."
     I ran to my grandmother's house, for she always told the truth.Grandmother was at home. I told   1   
everything. "No Father Christmas?" she was a little   2  . "Don't belive it.Put on your coat,and let's go."
     "Go? Where, Grandma?" I asked.
     "Kerby's Store."
     As we walked through its doors. Grandma handed me the dollars and said. "Take the   3   and buy
something for someone who needs it. I'll wait for you in the car." Then she turned and walked out of
the Kerby's.
     For a few seconds I just stood there,holding the money, wondering   4   to buy, and who to buy it for.
     I thought of   5   I knew my family,my friends,my neighbours…I suddenly thought of Bobbie Decbar, a   6   with bad breath and messy hair. He sat right behind me   7   Mrs. Polack's class.
     Bobbie   8   went to any party during the winter.His mother always wrote a note, telling the teacher that
he had a cough,   9   we all knew that he didn't have a cough,and he didn't have a coat.I decided to buy
Bobbie a red warm coat  10  he would like.
     That evening, grandma helped me wrap the coat in Christmas paper and ribbons, and  11  "To Bobbie.
From Father Christmas" on it. Grandma told me Father Christmas never let people know that he  12  them.
Then she drove me over to Bobbie's home, telling that I was helping Father Christmas  13  the presents.
     Grandma parked the car along the street and we hid behind the trees near Bobbie's home.Then Grandma
said to me. "All right, Father Christmas get going."
     I took a deep breath, rushed to his front door,put the present down  14  the door, rang the doorbell and
flew back to the safety of the  15  and Grandma. We waited breathlessly in the dark for the front door to
open. Finally it did and there stood Bobbie.
     That night, I realized that Father Christmas was alive and well and we were on his team.
( )1. A. him       
( )2. A. angry     
( )3. A. book      
( )4. A. what      
( )5. A. everybody 
( )6. A. girl      
( )7. A. for      
( )8. A. always    
( )9. A. so      
( )10. A. where    
( )11. A. read     
( )12. A. helped    
( )13. A. give up  
( )14. A. on      
( )15. A. shop    		B. her        
B. happy      
B. coat      
B. when      
B. nobody    
B. boy      
B. on      
B. often     
B. if      
B. that     
B. say     
B. belived    
B. give  away   
B. behind    
B. cars      		C. them      
C. tired     
C. present   
C. where     
C. somebody  
C. man     
C. in     
C. sometimes    
C. but    
C. who     
C. write    
C. taught    
C. put up    
C. outside   
C. door      		D. you      
D. afraid   
D. money    
D. how      
D. anybody              
D. woman    
D. with     
D. never    
D. and      
D. why      
D. spell    
D. made     
D. put off  
D. over     
D. trees    
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单项选择题

下列担保形式中，不属于物权担保的是( )。

A．抵押
B．质押
C．留置
D．保证
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