短文改错As soon as I heard what you had been selected President of the Student Union, I feltthat/ whatI must write to you to express my pleasures. I really take pride of your achievementplThe Student Union plays a essential role in our campus life. Manage such anManagingorganization may be a challenge to you, or you will also enhance your ability. I believedbutbelievethis position will be a chance for you A embrace an enriched life. Please accept my mostsincerely congratulations!sincereBest wishes for your much mere-further success

3.A地形起伏的变化、土壤湿度和盐碱度等土壤条件的差异均会影响群落植被水平分布林场中马尾松是一个种群,其高低错落有致现象属于种群的空间特征,不属于群落的垂直结构;光照强度决定了群落中植物的垂直结构,栖息空间和食物条件决定林中各种动物的垂直分层分布;群落均有水平结构和垂直结构,修剪后的草地既有水平结构,也有垂直结构。

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