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有角的公羊与无角的母羊交配，F1代中母羊都无角，公羊都有角，使F1中公羊与母羊交配，得到的F2代中，公羊3/4有角:1/4无角，母羊3/4无角:1/4有角，这一现象属于______遗传。

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参考答案：从性

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     Today I want to go to the People's Hospital to see my friend Linda.   1   I don't know the way. I need
(需要) some   2  . Just then   3   old man walks past. I ask him, "Excuse me,   4   is the way to the People's
Hospital?" " Sorry, I don't know. You can   5   the policeman over there." he says. "Thank you all the same."
Then I go up to the   6  .
     "Excuse me, how can I   7   the People's Hospital?" I ask. The policeman says, "It is not far   8  . It's
about ten minutes' walk. Go along this street, and at the third turning   9   the right, and you can find  10 ."
     "Thank you very much. Goodbye!" "That's all right. Bye!"
( )1. A. So        
( )2. A. help      
( )3. A. a         
( )4. A. where    
( )5. A. ask       
( )6. A. old man   
( )7. A. get       
( )8. A. from here 
( )9. A. at        
( )10. A. her        		B. Or          
B. turn       
B . an         
B. how        
B. tell       
B. young man   
B. look         
B. from there
B. on         
B. it          		C. And       
C. turning 
C. the         
C. which   
C. say         
C. policeman     
C. look after 
C. here       
C. between    
C. me       		D. But           
D. helping       
D. /            
D. what          
D. speak        
D. friend                          
D. get to      
D. there        
D. in            
D. him       
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单项选择题 A1/A2型题

尿潴留量超过多少毫升时，应放置导尿管持续引流（）。

A.100ml

B.300ml

C.500ml

D.800ml

E.1000ml
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