原来向日葵的花盘下面茎干里有一种可以刺激细胞生长的激素,它叫做生长素。在晴天太阳光的照射下,背光一面的\'生长素比向光一面多,也长得快。这样,就使得整个花盘朝太阳点头,围着太阳转,好像它对着太阳"微笑"。还知道向日葵花盘是由100000小花组成的。
通过对《十万个为什么》学习,我知道水仙花栽在清水里也会生长、开花;植物睡觉是因为太累了;竹平时开花不结果,但也可以繁殖后代;剪取瓶插鲜花最好在中午进行;海底不是平坦的,像陆地一样有海岭、盆地、平原及海沟。等等知识。
通过学习书本里的科学知识,我对我身边的事情更加了解,我更加热爱科学了!
大镜仔细观察起来。我发现蜗牛的壳是螺旋形的,壳口有一点点透明,后面就不透明了,有人侵犯它的时侯,蜗牛就会把头缩进壳里保护自己,不动的时侯,它也可以在壳里好好的休息,真是一举两得啊!它的头部有四条触角,触角上的两个小黑点就是它的.眼睛,我用手轻轻地碰了碰它的眼睛,它似乎看到了坏人,立刻逃了回去,但没过一会,它又伸出来了。我还发现,蜗牛头部有个很小的洞,老师告诉我们说:“这就是它的嘴,而且它的嘴里有三万多颗小牙齿,就是纸盒也能咬破。”别看这蜗牛小,还真是厉害啊!
老师还告诉我们说:“蜗牛壳下的地方就是它的”腹部“,”腹部“中间很厚,边上很薄,腹部上还长着一种能动的腹足。”我还发现,蜗牛在在爬行后会留下一条长长的液体,经过老师的讲解,我也明白了:那是它分泌出来的黏液,可以在爬行时减少摩擦,不让自己的底部受到伤害,还有利于前行。
一节课下来,一条小小的蜗牛让我们学到了不少知识,我发现,只要我们有心去观察,就会发现许多有趣的事情,也会发现大自然的奥秘!
要求:1、主题明确。语言流畅。思路清晰。2、字数在100字以内。
思路点拨
写记叙文要按照事物发展的客观规律叙述,所叙述的内容要交代清楚,条理清晰,重点突出,主次分明,详略得当。
这篇文章也是记叙文,主人公应该用第三人称,时态以一般过去时为主。以主人公为中心线索,以一、两件事件为重点内事件为重点内容去组织材料,反映主人公的形象特征。整个内容情节要合情合理,有真实感,叙述时可按事情发展的顺序进行,同时加以点评。
参考范文
My Classmate
Liu Kai is my classmate. He is a good student and always ready to help others.
One day on his way to school, he saw a little girl crossing the road. A car was coming towards her quickly and the girl was too frightened to move. The car nearly hit her. Just then LiuKai rushed up to her and caught her by the arm. The little girl was saved. She told him where she lived, and he took her home. When LiuKai hurried into the classroom, the teacher had already begun his lesson. He told the teacher why he was late. He was then praised for what he had done.
My Classmate
Liu Kai is my classmate. He is a good student and always ready to help others.
One day on his way to school, he saw a little girl crossing the road. A car was coming towards her quickly and the girl was too frightened to move. The car nearly hit her. Just then LiuKai rushed up to her and caught her by the arm. The little girl was saved. She told him where she lived, and he took her home. When LiuKai hurried into the classroom, the teacher had already begun his lesson. He told the teacher why he was late. He was then praised for what he had done.
要说起我们班的同桌冤家,那就非韩蕙宇和耿鹏莫属了,他们可真是一对同桌冤家,天天打打闹闹,不休息一刻。
“唉,快跑”这是谁的声音,原来是耿鹏的声音,到底是怎么一回事,哦,原来上课时,耿鹏觉得韩蕙宇的手套很好玩,绵鼓鼓的,越看越像个拳击手套,于是耿鹏趁韩蕙宇回答问题时,悄悄拿走了“拳击手套”,在桌子的抽屉里试起了拳击,一会儿打打这本书,一会儿打打那本书。等下课了,韩蕙宇想出去,却找不到手套,一看,是耿鹏拿着,就生气了,只见韩惠宇气势磅礴,两手插腰,大喊一声“耿鹏,有本事你别走。”
当然,耿鹏不可能有本事,他抱头乱窜,像只老鼠一样,大家都争着想看看这场“俄罗斯”与“美国”的战争,看看到底谁输谁赢,韩蕙宇追着耿鹏,边追边打,这时,耿鹏跑到了楼下,韩蕙宇堵在门口,对耿鹏说:“我不信你不上来。”当然,最后,耿鹏没法了,只好向韩蕙宇求饶:“韩姑奶奶,你饶我一命,你的大慈大悲我永生难忘……”听耿鹏这么一说,韩蕙宇的`气早已抛到了九霄云外。
“呤呤……”又下课了,随着一阵铃声,只听一声“快跑”,唉,不知这对同桌冤家又发生了什么事……
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