简介：Treesareusefultomaninthreeimportantways:theyprovidehimwithwoodandotherproducts,theygivehimshade,andtheyhelptopreventdrought(干旱)andfloods.Unfortunately,inmanypartsoftheworldmanhascutdownalargenumberoftreeseveryyear.
Trees Are Useful（高一适用）
