- 問題詳情:Treesaregreatlyusefultomaninthreeveryimportantways.Thefirstimportantwayisthattheyprovidemanwithfood,woodandotherproducts.Treesprovidenotonlymanwithfood,butalsomanyanimalswithfood.Withouttreesmanyanimalscouldnotliveontheearth.It'snoteasyforma...
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