问题 选择题

用光学显微镜观察黑藻叶片结构时,低倍镜下不能观察到的结构是[ ]

A.细胞壁

B.液泡

C.核糖体

D.细胞核

答案

答案:C

完形填空
完形填空。
     Some English words have some  1   behind them. The word "sandwich"
is very  2   in England. Do you want to know the story behind it? You must
know something about an Englishman   3   Sandwich. He lived in the  4 _
century(世纪).       
     Sandwich was rich, but he  5   cards for money. He often played for 24
hours and he didn't   6   to have his meals. He asked his men   7   him some
meat and bread so he could play when he was eating.  He put meat between
two pieces of bread and held(拿)the bread    8    his left hand when he was
playing with his right hand.  People liked his idea and began to eat bread
and meat _ 9   .  
     From the name of Sandwich, we   10    the word "sandwich" today.
( )1. A. stories        
( )2. A. interesting    
( )3. A. names          
( )4. A. eighteenth    
( )5. A. enjoys playing
( )6. A. come          
( )7. A. to bring      
( )8. A. in            
( )9. A. by this way    
( )10.A. call          

B. words          
B. popular        
B. about          
B. eight          
B. enjoyed to play
B. start          
B. to take        
B. on            
B. in this way    
B. know          

C. history        
C. beautiful      
C. called        
C. last          
C. enjoyed playing
C. begin          
C. to put        
C. to            
C. in same way    
C. take          

D. experience  
D. different    
D. of          
D. twenty-first
D. made        
D. stop        
D. to show      
D. by          
D. on this way  
D. have        

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