流行病学调查结果表明某化合物与人类膀胱癌的发生具有高度相关性,但用大鼠和家兔进行长期

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问题:

流行病学调查结果表明某化合物与人类膀胱癌的发生具有高度相关性,但用大鼠和家兔进行长期动物致癌试验,结果为阴性。

为进一步确认该化合物的致癌性,最好的方案是()

A.哺乳动物细胞正向突变试验

B.其他哺乳动物的长期致癌试验

C.恶性转化试验

D.构效关系分析

E.哺乳动物细胞染色体畸变试验

考点:营养与食品卫生(医学高级)卫生毒理学卫生毒理学题库
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完形填空。
     For many American and British teenagers, the gift-giving season comes twice a year: on birthdays and at
Christmas every December 25. On these days, young people can   1   lots of gifts wrapped (包装) in
bright-colored paper.
     In recent years the most   2   gifts have been iPods and Mp3 players, digital cameras and video games. When
the Nintendo Wii (任天堂Wii)   3  , people lined up in parking lots (停车场) in the middle of the night. They hoped
to be the first ones to enter the store when it opened in the morning   4   they could buy the Wii before it was sold
out!
     Most teens don't have the   5   to buy fancy electronic gifts for their friends. Luckily, expensive gifts aren't
  6  . Teens often give   7   books, CDs, DVDs and candy.
     Hand-made gifts are   8   popular because they are more personal and one-of-a-kind. Gift-givers can save
money by making something   9  , and it is a good opportunity (机会) to be creative. People like to receive
hand-made gifts because they know that the givers put time and effort  10   them. If you can't think of the perfect
gift to give, a box of chocolates will almost always do the trick!
( ) 1. A. expect   
( ) 2. A. personal  
( ) 3. A. went out  
( ) 4. A. even if  
( ) 5. A. time    
( ) 6. A. necessary 
( ) 7. A. the other 
( ) 8. A. never   
( ) 9. A. alone   
( ) 10. A. into    
B. imagine   
B. popular   
B. broke out  
B. as if    
B. money    
B. important       
B. others    
B. seldom    
B. new     
B. for    
C. afford    
C. interesting 
C. came out   
C. so that   
C. chance    
C. usual            
C. each other  
C. yet    
C. exciting   
C. on      
D. admin     
D. famous       
D. took off     
D. as soon as   
D. place        
D. special      
D. another      
D. also         
D. themselves   
D. to         
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