学生阶段

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  • 精彩范文400字Deforestation2011-09-30
  • Deforestation   As time goes , there are more and more world problems about nature and development. I think deforestation is the most serious e

  • Air Around Us2011-09-30
  • Air is around us. We can not see it, smell it, or taste it. But we can feel the wind blow. We can see the wind move waves on the water, clouds in