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  wϥξɮvW䴩!    
  

 This column provides diversified scientific knowledge for     teaching and learning.
 

  
     
Space  Elements  Animals  China  Damage to ecosystem  
Circuit  Compounds  Plants  Foreign countries  Air pollution  
Light  Acid and alkali  Cells and reproduction  Scientific development  Noise  
 Materials  Human respiratory system    Greenhouse effect  
   Human digestive system      
   Human circulatory system      
   Sense organs and nervous system      
   Food and energy      
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