Treesareusefultomeninthreeimportantways：Theyprovidethe...
问题详情： Treesareusefultomeninthreeimportantways：Theyprovidethemwithwoodandotherproducts(产品)，theygivethemshade(树荫)，andtheyhelptopreventdroughtandfloods． Unfortunately，inmanypartsoftheworld，menhavenotr...