问题 选择题

石油是一种没有固定沸点的油状物,经过汽化、冷凝分离后可得到汽油、煤油等产品。由此可以判定石油属于

A.氧化物

B.纯净物

C.化合物

D.混合物

答案

答案:D

题目分析:石油中含有汽油、煤油等多种成分,属于混合物。选D。

点评:混合物是由不同种物质组成的,成分复杂;而纯净物是由一种物质组成的,成分单一。

完形填空
完形填空。
     Music as medicine. Do you like turning    1    the radio to your favorite music to drive    2    away. Many
people do use music for themselves, for example for relaxation to    3    their moods. But the study of music
therapy (疗法) takes the use of music much further, from combating cancer.
     The uses of music therapy are great. Music therapy can    4     reduce (减轻) the anxiety of hospital    5    
undergoing difficult medical procedures.
      Difficulty    6    is a common problem for cancer. Music therapy which helps promote deep breathing,
lower heart rate, lower    7    pressure. That can help cancer patients sleep    8    Relaxing the body can also
help reduce physical pain, and people may need less    9    
     People don't have to be    10   to respond to music. It's relaxing, comforting and soothing.
( )1. A. off        
( )2. A. happiness   
( )3. A. change     
( )4. A. use to     
( )5. A. patients   
( )6. A. studying   
( )7. A. stomach    
( )8. A. bad        
( )9. A. healthy food
( )10. A. sick      
B. up          
B. sadness       
B. enjoy         
B.  used to      
B. doctors       
B. eating       
B. blood        
B. worse        
B. pain medication
B. illness      

C. down   
C. pleasure
C. improve   
C. use                  
C. nurses  
C. drinking  
C. head   
C. good    
C. sleep   
C. good    

D. in          
D. kindness    
D. like         
D. be use to    
D. cleaners      
D. sleeping     
D. eye           
D. better      
D. exercises     
D. well    

解答题