问题 单项选择题

血浆中起关键作用的缓冲对是()

A.KHCO3/H2CO3

B.NaHCO3/H2CO3

C.K2HPO4/KH2PO4

D.Na2HPO4/NaH2PO4

E.蛋白质钠盐/蛋白质

答案

参考答案:B

完形填空
完形填空
     "I love you, Bob." "I love you, too,  Nancy." My parents' loving reassurances were sweet, touching
and surprising.
     They married on September 14th, 1940, after several __1__ she was __2__ 30 and knew it was
time to start a(n) __3__. The handsome, welleducated man who came by her office was __4__ by her
figure, her blue eyes.
     The __5__ didn't last long.
     Seeds of __6__ started to grow almost immediately. She liked to travel; he __7__ the thought. He
loved golf; she did not. He was a Republican; she was a Democrat. They __8__ at the bridge table,  
at the dinner table, over money, and so on. __9__, they owned a business together and the __10__
frustrations (挫折) of life at the office came to cause trouble at home.
     There was a hope that they would __11__ once they retired, and the angry winds did calm
somewhat,  __12__ what remained made itself bright, hard bitterness. "I always thought we'd… " my
mother __13__ begin, before launching __14__ a long list of my father's faults, which I can still recite
today. __15__ he listened, my father would murmur angry threats and curses(辱骂).
      It wasn't the happiest marriage, but as their 60th anniversary __16__, my sister and I decided to
throw a party. Sixty years was a long time,  __17__; why not try to make the best of things? We'd
provide the cake, the balloons, the toasts, and they'd abide by one rule: no __18__.
     The agreement was honored. We had a wonderful__19__.  It was an important celebration,  
because __20__, things began to change for my parents. As debilitating dementia (老年痴呆症)
settled in, their marriage was about the only thing they wouldn't lose.
( )1. A. talks          
( )2. A. drawing        
( )3. A. family        
( )4. A. astonished    
( )5. A. story          
( )6. A. anger          
( )7. A. hated          
( )8. A. beat          
( )9. A. As a result    
( )10. A. everyday      
( )11. A. distinguish  
( )12. A. though        
( )13. A. might        
( )14. A. for          
( )15. A. As            
( )16. A. passed        
( )17. A. all in all    
( )18. A. fighting      
( )19. A. beginning    
( )20. A. day after day
B. dates                
B. getting              
B. firm                  
B. moved                
B. relationship          
B. difference            
B. welcomed              
B. hit                  
B. To make matters worse
B. major                
B. change                
B. and                  
B. would                
B. by                    
B. After                
B. approved              
B. at all                
B. attacking            
B. life                  
B. soon after            
C. interviews              
C. nearing                
C. business                
C. affected                
C. romance                
C. confusion              
C. encouraged              
C. struggled              
C. To everyone's surprise  
C. regular                
C. continue                
C. while                  
C. could                  
C. with                    
C. Before                  
C. approached              
C. after all              
C. blaming                
C. try                    
C. now and then            
D. visits              
D. becoming            
D. occupation          
D. struck              
D. marriage            
D. betrayal            
D. avoided              
D. fought              
D. At the same time    
D. normal              
D. turn                
D. but                  
D. should              
D. into                
D. Once                
D. arrived              
D. as a whole          
D. scolding            
D. day                  
D. never before        
单项选择题