“碧玉妆成一树高，万条垂下绿丝绦，不知细叶谁裁出，二月春风似剪刀。”万千枝条及其绿叶，都是由植物体哪一结构发育而来：（  ）

俄罗斯大部分地区冬季十分寒冷的主要原因是

根据课文内容选词填空。

             thick      soft        hot         hear       blind      elephant        hard

    It is a____ day. Four men are under a tree. They are all ____ . They cannot see. Then they ____  a noise. Oh, it's an____ . They touch the elephant. One touches its ear, he thinks the elephant is____ . One touches its tooth, he thinks it's ____ . One touches its tail, he thinks it's thin. One touches its leg, he thinks it's ____ . How funny!