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某一青年学生健康体检时，心电图示心室率65次／分，PR间期为0．26秒，QRS-T波群未见异常。

应与之鉴别的情况是（）

A.交界性期前收缩

B.室性期前收缩

C.二度窦房传导阻滞

D.一度窦房传导阻滞

E.房室结双径路

答案

参考答案：E

完形填空
完形填空。        
     Traffic means everything and everybody is using the roads. Today more and    1  people live in cities.
So there is   2   traffic and usually not enough   3   , and   4   of the roads are too narrow. That is   5   there are a great many accidents. In cities   6   over the world thousands   7   people die or   8   hurt in traffic
accidents. Of course, traffic accidents also   9   outside cities in the countryside, but there is not   10   much
traffic, so there are not so many accidents.
( )1. A. most    
( )2. A. a lot of
( )3. A. ways    
( )4. A. many    
( )5. A. because  
( )6. A. of      
( )7. A. from    
( )8. A. receive  
( )9. A. happen  
( )10. A. so      		B. many  
B. many  
B. means
B. much  
B. so    
B. all  
B. and  
B. go    
B. have  
B. as    		C. some      
C. a number of
C. roads      
C. more      
C. why        
C. and        
C. with      
C. are        
C. produce    
C. enough     		D. more  
D. a lots
D. cars  
D. few  
D. that  
D. from  
D. of    
D. take  
D. form  
D. such 
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单项选择题

可进一步分化形成成牙本质细胞的结构是（）

A.成釉器

B.牙囊

C.牙板

D.牙 * *

E.前庭板
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