问题 单项选择题

以下细胞中不受HIV侵犯的是

A.CD4+T细胞

B.CD8+T细胞

C.B细胞

D.树突状细胞

E.巨噬细胞

答案

参考答案:B

解析:
HIV感染后,CD4+T细胞数量减少和功能缺陷导致宿主免疫功能全面障碍是AIDS的主要发病机制。HIV还能感染巨噬细胞、树突状细胞、B细胞和脑组织中的小胶质细胞。但HIV不能感染CD8+T细胞。

单项选择题
完形填空
完形填空
     One morning all the employees reached the office as usual. And on the wall they saw a big    1  on
which it was written:Yesterday, the person who had been   2  your growth in this company passed    .
We invite you to join the funeral prepared in the   4  .
     In the beginning,they all got   5  for the death of one of their colleagues.   6    after a while they started
getting   7  to know who was the man that limited the growth of his colleagues and the company itself.
     The  8  in the gym was such that security agents(保安)were   9  to control the crowd within the room. The more people reached the coffin, the more the excitement  10  up. Everyone whispered to each other:"   11  on earth is this guy?"
     One by one the excited employees got closer to the coffin, and when they   12  inside it, they   13 
became speechless. They stood nearby the coffin, shocked and in    14  ,  as if someone had  15  the
deepest part of their soul.
     There was a   16  inside the coffin;everyone who looked inside it could see himself. There was also
a sign next to the mirror that  17  : there is only one person who is 18  to set limits to your growth:IT IS
   19 !!!!!! Your life doesn't change when everyone around you changes. Your life changes when YOU
change,when you go beyond your limiting beliefs inside. Don't be afraid of   20  ; build yourself and your reality. It's the way you face life itself that makes the difference!
( )1. A. card        
( )2. A. encouraging
( )3. A. on          
( )4. A. office      
( )5. A. sad        
( )6. A. And        
( )7 .A. ready      
( )8. A. surprise    
( )9. A. admitted    
( )10. A. heated    
( )11. A. Where      
( )12. A. walked    
( )13. A. suddenly  
( )14. A. sorrow    
( )15. A. stolen    
( )16. A. 1etter    
( )17. A. wrote      
( )18. A. sure      
( )19. A. YOU        
( )20. A. punishment
B. post      
B. helping    
B. by        
B. gym        
B. excited    
B. But        
B. pleased    
B. anger      
B. forced    
B. woke      
B. What      
B. looked    
B. gradually  
B. order      
B. touched    
B. book      
B. read      
B. eager      
B. ME        
B. praises    
C. sign      
C. building  
C. away      
C. way        
C. afraid    
C. Or        
C. curious    
C. excitement
C. forbidden  
C. turned    
C. How        
C. got        
C. merely    
C. silence    
C. attacked  
C. mirror    
C. showed    
C. afraid    
C. HE        
C. changes    
D. 1etter      
D. limiting    
D. down        
D. meeting room
D. calm        
D. So          
D. serious    
D. sadness    
D. ordered    
D. kept        
D. Who        
D. turned      
D. extremely  
D. person      
D. seen        
D. appeared    
D. reflected  
D. able        
D. ITSELF      
D. blame