问题 选择题

显微镜的镜头脏了,要用(  )擦拭干净.

A.擦镜纸

B.纱布

C.纸巾

D.作业纸

答案

清洁镜身时应有纱布;清洁物镜和目镜的镜头时,应用擦镜纸.擦镜纸质软又不易掉毛,用擦镜纸擦拭镜头既可以清洁镜头,又可以避免损伤镜头和有少量的纤维留在镜头上,影响观察效果.通过分析知道当显微镜镜头不清洁时,除去污物,是对显微镜的物镜和目镜的镜头能进行清洁,所以应用擦镜纸擦拭.

故选:A.

单项选择题
完形填空
完形填空
     When I was in the seventh grade, I was a candy striper(义I)  at a local hospital in my town. I    1  
about thirty to forty hours a week during the summer. Most of the time I spent there     2   with Mr
Cillespie. He never had any   3    , and nobody seemed to care about his    4    .      
     I spent many days there _ 5    his hand and talking to him, helping with   6   that needed to be done.
He became a close friend of mine,   7   he responded with only an occasional    8    of my hand. Mr
Gillespie was m a coma(昏迷).    
     I left for a week to   9   with my parents, and when I came back, Mr Gillespie was gone. I didn't
have the  10  to ask any of the nurses where he was,   11   fear they might tell me he had died. So with
many  12   unanswered, I continued to volunteer there through my eighth-grade year.   13   years later,
when I was a junior in high school, I was at the gas station when I noticed a   14   face. When I realized
who it was, my eyes were filled with tears. He was   15   ! I asked if he was Mr Gillespie. With an   16  
look on his face, he replied yes. I explained how I knew him and that I had spent many hours talking with
him in the hospital. Tears    17   up in his eyes, and he gave me the warmest bug I had ever   18   .      
     Then he told me about his life and what   19      of him to put him in the coma. We cried for a while
and exchanged a bug, said our goodbyes and went our  20 ways.
( )1. A. undertook  
( )2. A. talked    
( )3. A. visitors  
( )4. A. condition  
( )5. A. catching  
( )6. A. something  
( )7. A. as if      
( )8. A. squeeze    
( )9. A. interview  
( )10. A. chance    
( )11. A. in        
( )12. A. worries  
( )13. A. Several  
( )14. A. strange  
( )15. A. dead      
( )16. A. uncertain
( )17. A. filled    
( )18. A. given    
( )19. A. occurred  
( )20. A. opposite  
B. volunteered  
B. met          
B. doctors      
B. expense      
B. seizing      
B. nothing      
B. even though  
B. performance  
B. communicate  
B. courage      
B. by            
B. troubles      
B. Many          
B. familiar      
B. excited      
B. ugly          
B. welled        
B. made          
B. happened      
B. different    
C. obtained            
C. was                  
C. nurses              
C. accommodation        
C. scratching          
C. everything          
C. because              
C. activity            
C. vacation            
C. time                
C. for                  
C. cautions            
C. Ten                  
C. handsome            
C. surprised            
C. unconscious          
C. moved                
C. received            
C. arose                
C. separate            
D. participated      
D. helped            
D. neighbors        
D. comfort          
D. holding          
D. anything          
D. so                
D. movement          
D. discuss          
D. choice            
D. with              
D. questions        
D. Few            
D. curious          
D. alive            
D. unwilling        
D. brought          
D. exchanged        
D. became            
D. same