Treesareusefultomeninthreeimportantways：Theyprovidethe...
問題詳情： Treesareusefultomeninthreeimportantways：Theyprovidethemwithwoodandotherproducts(產品)，theygivethemshade(樹蔭)，andtheyhelptopreventdroughtandfloods． Unfortunately，inmanypartsoftheworld，menhavenotr...