Botany
Botany, the study of plants, occupies a peculiar position in the history of human knowledge. For many thousands of years it was the one field of awareness about which humans had anything more than the vaguest of insights. It is impossible to know today just what our Stone Age ancestors knew about plants, but from what we can observe of preindustrial societies that still exist a detailed learning of plants and their properties must be extremely ancient. This is logical. Plants are the basis of the food pyramid for all living things even for other plants. They have always been enormously important to the welfare of people not only for food, but also for clothing, weapons, tools, dyes, medicines, shelter, and a great many other purposes. Tribes living today in the jungles of the Amazon recognize literally hundreds of plants and know many properties of each. To them, botany, as such, has no name and is probably not even recognized as a special branch of knowledgeat all. Unfortunately, the more industrialized we become the farther away we move from direct contact with plants, and the less distinct our knowledge of botany grows. Yet everyone comes unconsciously on an amazing amount of botanical knowledge, and few people will fail to recognize a rose, an apple, or an orchid. When our Neolithic ancestors, living in the Middle East about 10, 000 years ago, discovered that certain grasses could be harvested and their seeds planted for richer yields the next season the first great step in a new association of plants and humans was taken. Grains were discovered and from them flowed the marvel of agriculture: cultivated crops. From then on, humans would increasingly take their living from the controlled production of a few plants, rather than getting a little here and a little there from many varieties that grew wild - and the accumulated knowledge of tens of thousands of years of experience and intimacy with plants in the wild would begin to fade away.
GRE写作考试备考注意问题
GRE写作模仿范文有妙招
GRE作文评分标准:重要性依次递减
GRE issue作文得分要点:A
GRE作文经典精致小句型:知识篇+教育篇
为何他们的GRE作文能拿高分
GRE作文备考高分必备句型
GRE作文分类题库:行为
新GRE写作满分六大备考经验总结
GRE写作常用特色词汇汇总
GRE写作词汇集锦:词组/连接词
GRE Arguement高分写作方法分段讲解
GRE写作要点:句型如何写
GRE作文高分:逻辑思路能力
GRE写作精华模板+句型
GRE写作备考须知
GRE issue写作四种方法练习
将题库分类 GRE作文更清晰
GRE/GMAT写作论据设计和构造介绍
GRE写作:类比在ISSUE与ARGUMENT中的运用
GRE issue写作技巧:审题+论证+AW
GRE Argument写作特点及破解步骤
GRE作文备考书籍力荐
GRE写作高频词汇整理
GRE issue写作范文:企业领导责任
GRE Issue写作高分经验技巧
GRE issue写作破题方法有三
GRE作文机经使用指南
GRE写作句型解析:多种方式地道表达“快乐”
GRE作文:如何取悦电脑计分器
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |