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问题 选择题
验电器的金属箔因带正电荷相互排斥而张开一定角度，此时用与毛皮摩擦过的橡胶棒与验电器的金属球接触，验电器金属箔张开的角度（   ）

A．一定增大

B．一定减小

C．一定闭合

D．无法判断

答案

答案：D

完形填空
完形填空。
     I am fine here    1     China. I     2     classes with Chinese     3   . Now I have     4     Chinese friends.
They teach me Chinese and I teach     5     English . I can     6     a little Chinese now. In the afternoon,
we sing and     7     games. My school is     8     very big, but     9     is very nice, It is    10    a river.
Sometimes we go to swim in the river. We go to school five days every week. On Sunday I go shopping
with my Chinese friends. I have a good time here. Don't worry about me, mother.
( ) 1. A. at        
( ) 2. A. am        
( ) 3. A. families  
( ) 4. A. many      
( ) 5. A. they      
( ) 6. A. say      
( ) 7. A. do        
( ) 8. A. but      
( ) 9. A. it        
( ) 10. A. on       		B. in      
B. have    
B. workers
B. much    
B. them    
B. tell    
B. play    
B. no      
B. it's  
B. at      		C. on      
C. has      
C. farmers  
C. a lot    
C. their    
C. speak    
C. make    
C. not      
C. its    
C. over     		D. over        
D. do          
D. students    
D. the        
D. theirs      
D. talk        
D. like        
D. isn't      
D. that      
D. near        
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单项选择题

有关DR，说法正确的是（）

A.空间分辨力进一步提高

B.成像速度快

C.曝光剂量缩短

D.探测器寿命更长

E.以上都正确
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