标签：话题作文 话题 高考英语作文
字数：1000字
提要：PlantsPlants seem to know which way is up and which way is down; besides, they seem to know right from left. If a cutting from a tree is kept alive, new shoots will grow from the endthat grew in the highest part of the tree.There is no noticeable difference between the top and the bottom of the living stick, even under a microscope. Even so, the stick will not send out shoots from the end it regar..