评价网 > 科教作文 > 英语作文 > 高中英语作文 > 正文

分类说明:植物-Plants

2014-02-21 02:44 植物
【内容提示】
根据下面内容要点写一篇有关植物分类的文章：
①植物是非常重要的生物；没有植物，生命就无法维持。动物和人的食物来源于植物和其他动物。
②植物可以利用空气、水和阳光制造养料，而人和动物则不能。
③植物的种类繁多，但主要可分为两大类，即开花植物（flowering plants）和不开花植物（nonflowering plants）。
④开花植物有根、茎、叶、花和果。我们周围所有的树木大都是开花植物。
⑤不开花植物在我们周围见不到多少，它们是些针叶树、苔藓、欧龙牙草之类。
⑥多数植物不是由种子而是由孢子长出来的。孢子和种子非常相似，落到潮湿背阴处就长成新的植物。
以下词语供参考：
1．coniferous a．针叶树的  2．moss n．苔藓；地衣3．liver-wort n．欧龙牙草  4．algae n．水藻；海藻  5．fungi n．真菌 6．spore n．孢子
【作文示范】
Plants
Plants are very important living things.  Life could not go on if there were no plants. This is because plants can make food from air, water and sunlight. Animals and man cannot do so. Animals get their food by eating plants and other animals. Man gets his food by eating plants and animals, too. Therefore, animals and man need plants in order to live.
If you look carefully at the plants around you, you will find that there are many types of plants. Some plants are large while others are small. Most plants are green.
There are two main types of plants: flowering plants and nonflowering plants.
Flowering plants have roots, stems①, leaves, flowers and fruits. Almost all the trees around us are flowering plants. You can probably recognize some plants from their flowers or their fruits.
Nonflowering plants include coniferous trees, mosses, liver-worts, algae and fungi. You cannot see many nonflowering plants around you.
Most plants do not grow from seeds. They grow from spores. Spores are very, very small. Some spores are so small and light that they can float in the air. We may say that spores are quite similar to seeds. When these spores fall on wet and shady② places, they usually grow into new plants. （转载自http://zw.NSEAC.com科教作文网）
【词语解释】
①stem [stem] n． 茎；（树）干；（叶）梗
②shady[＇sheidi] a．背阴的；阴凉的
【写法指要】
本文是一篇分类分析说明文。第一段写植物对人和动物的重要性，我们可以把它看做引言段。第二、三、四段是分类说明：第二段说植物种类繁多、大小不一，但总的可以分为两种，即开花植物和不开花植物；第三段具体说明开花植物的情况；第四段说明不开花植物的情况。第五段以植物是如何繁殖的作为全文的结束段。