新概念1

贡献者:ppk 类别:英文 时间:2015-08-17 08:50:38 收藏数:26 评分:0
返回上页 举报此文章
请选择举报理由:




收藏到我的文章 改错字
Lesson 1 Finding fossil man We can read of things that happened 5,000 years ago in the Near East,
where people first learned to write. But there are some parts of the word where even now people
cannot write. The only way that they can preserve their history is to recount it as sagas -- legends
handed down from one generation of another. These legends are useful because they can tell us
something about migrations of people who lived long ago, but none could write down what they did.
Anthropologists wondered where the remote ancestors of the Polynesian peoples now living in the
Pacific Islands came from. The sagas of these people explain that some of them came from Indonesia
about 2,000 years ago. But the first people who were like ourselves lived so long ago that
even their sagas, if they had any, are forgotten. So archaeologists have neither history nor legends
to help them to find out where the first 'modern men' came from. Fortunately, however, ancient
men made tools of stone, especially flint, because this is easier to shape than other kinds. They
may also have used wood and skins, but these have rotted away. Stone does not decay, and so the
tools of long ago have remained when even the bones of the men who made them have disappeared
without trace. Why, you may wonder, should spiders be our friends? Because they destroy so many
insects, and insects include some of the greatest enemies of the human race. Insects would make it
impossible for us to live in the world; they would devour all our crops and kill our flocks and
herds, if it were not for the protection we get from insect-eating animals. We owe a lot to the
birds and beasts who eat insects but all of them put together kill only a fraction of the number
destroyed by spiders. Moreover, unlike some of the other insect eaters, spiders never do the harm
to us or our belongings. Spiders are not insects, as many people think, nor even nearly
related to them. One can tell the difference almost at a glance, for a spider always has eight legs
and insect never more than six. How many spiders are engaged in this work no our behalf? One
authority on spiders made a census of the spiders in grass field in the south of England, and he
estimated that there were more than 2,250,000 in one acre; that is something like 6,000,000 spiders
of different kinds on a football pitch. Spiders are busy for at least half the year in killing
insects. It is impossible to make more than the wildest guess at how many they kill, but they are
hungry creatures, not content with only three meals a day. It has been estimated that the weight of
all the insects destroyed by spiders in Britain in one year would be greater than the total weight
of all the human beings in the country.
声明:以上文章均为用户自行添加,仅供打字交流使用,不代表本站观点,本站不承担任何法律责任,特此声明!如果有侵犯到您的权利,请及时联系我们删除。
文章热度:
文章难度:
文章质量:
说明:系统根据文章的热度、难度、质量自动认证,已认证的文章将参与打字排名!

本文打字排名TOP20