问题 单项选择题

异嗜性抗原是

A.来源于人体的抗原物质

B.同种间不同个体的特异性抗原

C.合成抗原

D.一类与种属特异性无关的存在于人与动物、植物、微生物之间的交叉抗原

E.针对自身成分的抗原

答案

参考答案:D

解析:异嗜性抗原的概念。

完形填空
完形填空。
     One day a young officer (军官) was at a station. He was   1   his way to visit his mother in   2   town.
He wanted to   3   her and tell her   4   his train would arrive. In this way she could meet him at the station
in her car. He looked in his   5   but couldn't find the   6   money for the telephone, so he went   7   to ask
for help.
     An old soldier happened to pass by. The officer   8   him and asked, "Have you got any change (零钱)
for ten pence (便士)?"
     "Wait a moment," the soldier answered while he was looking for the money in his pocket.
     "Don't you know how to speak to an officer?" the officer said   9  . "Now, let's start again. Have you
got any change for ten pence?"
     " 10 , sir," the old man answered quickly.
( )1. A. in       
( )2. A. the     
( )3. A. call  
( )4. A. how   
( )5. A. look   
( )6. A. good   
( )7. A. inside  
( )8. A. stopped  
( )9. A. happily  
( )10. A. Yes  
B. at    
B. a      
B. write    
B. where      
B. diary    
B. rich   
B. in   
B. hit     
B. sadly    
B. OK   
C. on      
C. the same   
C. find    
C. when    
C. address  
C. much    
C. outside  
C. hated      
C. angrily  
C. Sure   
D. by       
D. another  
D. hear     
D. why      
D. pocket   
D. right                                 
D. home     
D. enjoyed  
D. easily   
D. No       
单项选择题