<u id="6r3yn"><optgroup id="6r3yn"><strong id="6r3yn"></strong></optgroup></u><tr id="6r3yn"></tr> <dfn id="6r3yn"></dfn>

  1. <tt id="6r3yn"><b id="6r3yn"></b></tt>
  2. 色狠狠色噜噜AV一区,欧美熟妇性XXXX欧美熟人多毛 ,无码成人免费全部观看,日本高清色WWW在线安全,久久久国产99久久国产久麻豆 ,亚洲综合在线日韩av,成在人线无码aⅴ免费视频,日韩加勒比一本无码精品

    考研英語作文:Botany

    時間:2022-08-08 20:26:25 英語作文 我要投稿

    考研英語作文:Botany

      在平日的學習、工作和生活里,大家都跟作文打過交道吧,作文是人們以書面形式表情達意的`言語活動。那么一般作文是怎么寫的呢?以下是小編整理的考研英語作文:Botany,歡迎大家分享。

    考研英語作文: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 form what we can observe of pre-industrial societies that still eist a detailed learning of plants and their properties must be etremely 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 knowledge at 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 net 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 eperience and intimacy with plants in the wild would begin to fade away.

    【考研英語作文:Botany】相關文章:

    英語作文:植物學Botany11-10

    考研英語作文06-15

    英語考研作文02-15

    考研英語作文08-24

    考研英語作文06-15

    Statistics考研英語作文-英語作文09-30

    考研英語作文:OnWisdom08-05

    考研英語作文:Archaeology08-05

    考研英語作文模板07-20

    2014考研英語作文04-27

    主站蜘蛛池模板: 极品少妇被弄得高潮不断| 亚洲尺码电影av久久| 无码avav无码中文字幕| 亚洲国产精品日韩av专区| 丰满少妇在线观看网站| 综合久久给合久久狠狠狠97色| 天天av天天翘天天综合网色鬼| 强奷乱码中文字幕熟女一| 日韩精品无码一区二区视频| 亚洲中文字幕久久精品无码app| 色中色成人导航| 国产中文字幕精品在线| 亚洲午夜久久久精品影院| 野花香社区在线观看| 久久SE精品一区精品二区| 亚洲欧美日韩综合一区二区| 欧美日产国产新一区| 色婷婷精品大在线视频| 午夜免费男女aaaa片| 亚洲精品无码日韩国产不卡av| 一区二区高清国产在线视频| 熟女少妇内射日韩亚洲| 国产成人亚洲综合图区| 国产suv精品一区二区| 99在线在线视频观看| 国产成人综合野草| 亚洲综合一区国产精品| 成人免费无遮挡在线播放| 久久久久国产精品麻豆ar影院| 久久99久久99久久综合| 男人j进入女人j的视频免费的| 亚洲色婷婷六月亚洲婷婷6月| 欧美 国产 亚洲视频| 国产成人拍精品视频午夜网站| 亚洲一区二区三区日本久久九| 免费高清特级毛片A片| 日本一道高清一区二区三区| 蜜臀av午夜一区二区三区| 国产一区二区四区不卡| 国产-第1页-浮力影院| 97狠狠狠狼鲁亚洲综合网|