问题 选择题

下列实验基本操作(或实验注意事项)中,主要是出于实验安全考虑的是(  )

A.实验剩余的药品不能放回原试剂瓶

B.可燃性气体的验纯

C.气体实验装置在实验前进行气密性检查

D.滴管不能交叉使用

答案

答案:B

完形填空
完形填空。
     In recent years, people are more and more interested in computer games in many towns and cities. A
lot of small shops and restaurants along busy  1  have changed into  2  game houses in order to get more
money. These places are always filled with  3  especially young boys.
     In the computer game houses, people  4  a lot of money playing with a computer. It's  5  for one to win
against a computer, but one can make progress after  6  again and again. The  7  they lost, the more they want
to win when they play computer games. And at last they even can not live  8  it.
     The result is that some people don't want to  9 . Instead, they play in the computer houses for hours and
hours. For school boys, things are  10 . They have no mind for their lessons. When class is over, they rush
to the nearby computer house.
( )1. A. rivers    
( )2. A. small     
( )3. A. people    
( )4. A. take      
( )5. A. easy      
( )6. A. trying    
( )7. A. more      
( )8. A. with      
( )9. A. speak     
( )10. A. different
B. cities 
B. big    
B. boys   
B. win    
B. hard   
B. winning
B. less   
B. for    
B. play   
B. better 
C. markets  
C. computer 
C. women    
C. cost     
C. important
C. going    
C. harder   
C. without  
C. work     
C. even worse
D. streets 
D. sports  
D. girls   
D. spent   
D. wonderful
D. coming  
D. busier  
D. by      
D. live                              
D. changed 
单项选择题