新概念英语4 L2 Spare that spider
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.
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.
下一篇:年少有为
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
登录后可见
用户更多文章推荐
- 新概念英语4 L33 Education2023-11-23
- 新概念英语4 L32 Galileo reborn2023-11-23
- 新概念英语4 L31 The sculptor speak...2023-03-23
- 新概念英语4 L30 Exploring the sea-...2023-03-22
- 新概念英语4 L29 The hovercraft2023-03-21
- 新概念英语4 L28 Patients and docto...2023-03-20
- 新概念英语4 L27 The 'Vasa'2023-03-19
- 新概念英语4 L26 The past life of t...2023-03-18
- 新概念英语4 L25 Non-auditory effec...2023-03-17
- 新概念英语4 L24 Beauty2023-03-16
- 新概念英语4 L23 Bird flight2023-03-15
- 新概念英语4 L22 Knowledge and pro...2023-03-12
- 新概念英语4 L212023-03-11
- 新概念英语4 L20 Snake poison2023-03-10
- 新概念英语4 L19 The stuff of dream...2023-03-10
- 新概念英语4 L18 Porpoises2023-03-09
- 新概念英语4 L17 A man-made disea...2023-03-06
- 新概念英语4 L16 The modern city2023-03-03
- 新概念英语4 L15 Secrecy in industr...2023-03-01
- 新概念英语4L14 The Butterfly Eff...2023-02-28
- 新概念英语4 L13 The search for oil2023-02-27