题目

一棵柳树的结构层次由小到大依次是（ ）A. 细胞→组织→器官→系统→植物体B. 植物体→器官→组织→细胞C. 系统→植物体→器官→组织→细胞D. 细胞→组织→器官→植物体 答案：【答案】D【解析】植物体的结构层次从微观到宏观依次是细胞→组织→器官→植物体，植物体无系统。细胞是植物体结构和功能的基本单位，植物体的生长发育是从受精卵开始的。受精卵经过细胞分裂、分化，形成组织、器官，进而形成植物体。绿色开花植物是由根、茎、叶、花、果实、种子六大器官短文填空从方框中选择恰当的单词并用其适当形式填空，使短文完整、通顺。           with,from,kind,show,friend       Look,this is Andrew. He is a dolphin. He comes 1 the sea. He is only one year old. He can swim very well. He likes to play 2 a ball. I think he is a good player.      People like to see his 3 He is very 4 and smart. His home is in the Atlantic Ocean (大西洋). But now he is in the zoo. I think he is 5 of homesick (想家的) .1. 2.  3.  4. 5.