问题 单项选择题 A1/A2型题

下列说法错误的是()

A.X线束是从X线管向人体做锥形投射,因此,将使X线影像有一定的放大和变形

B.伴影的产生与锥形束有关

C.斜射投照会造成影像歪曲失真

D.减少伴影的方法是增大靶片距离

E.影像放大率与焦点胶片距离成正比

答案

参考答案:E

完形填空
完形填空。
     In America, on school and work days, breakfast in most homes is often a hurried meal of milk, bread,
juice or coffee. Some people even don't have it in order to get to  1  or school on time. Others just stop at
coffee shops for coffee. But on weekends,  2  are quite different. People usually get up late, so they have
enough time to have a large breakfast with eggs, home-fried potatoes and bread.
     Lunch is just a  3  break from the day's work rather than a large,long meal. It usually lasts  4  half an
hour or an hour, so family members do not have time to  5  home. Most people have a sandwich or a
hamburger, and fruit or ice cream for lunch.  6  people either take their lunches to work in the brown paper
"lunch bag",  7  eat a sandwich at a fast-food restaurant. Children  8  to bring the  "lunch box".
     Dinner is the most  9  meal of the day in the United States. At this meal, most American families can sit
down  10 . It is usually a hot, large meal and it is quite different from lunch, which is often cold and quick. 
 11  usually cooked dinner for their families in the past. Nowadays,  12 , with more women working and as
a result of "women's liberation (解放)", men are doing more in the  13 . Dinners throughout America are
quite  14 , but most people have a meat djsh, a vegetable,and rice or bread. Milk, water and soft drinks are
common at dinner, but wine is only for  15  occasions (场合). Dinner is usually eaten between 5:00 p. m.
and 7:00 p. m. and often in restaurants. Most Americans enjoy themselves at this time.
( )1. A. hospitals    
( )2. A. things       
( )3. A. real         
( )4. A. only         
( )5. A. leave        
( )6. A. Careful      
( )7. A. and          
( )8. A. forget       
( )9. A. important    
( )10. A. quietly     
( )11. A. Men         
( )12. A whenever     
( )13. A. dining-room 
( )14. A. strange     
( )15. A. special     
B. shops     
B. activities
B. long      
B. exactly   
B. get       
B. Clever    
B. or        
B. stop      
B. serious   
B. straight  
B. Parents   
B. however   
B. kitchen   
B. simple    
B. traditional
C. work    
C. reports 
C. boring  
C. nearly  
C. return  
C. Famous  
C. but     
C. prefer  
C. terrible
C. early   
C. Women   
C. whatever
C. study   
C. healthy 
C. usual   
D. factories 
D. prices    
D. short     
D. almost    
D. drive     
D. Working   
D. so        
D. decide    
D. common    
D. together  
D. Children  
D. wherever  
D. garden    
D. different 
D. ordinary   
单项选择题