这里是关于《新概念》的背诵任务！
上一篇学习后，我发现我不能准确的背诵下完整的句子，有的句子的单词在实际应用中是用不到的，所以在学习这篇的过程中掌握基本句型，识别单词大意，然后自己会举一反三就可以！
2.新概念4-Spare the spider
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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 least 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 an insect never more than six.
How many spiders are engaged in this work on our behalf? One authority on spiders made a census of the spiders in a 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 million 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.
你可能会想，为什么蜘蛛应该是我们的朋友？
因为它们消灭了那么多昆虫，而昆虫中包括一些人类最大的敌人。
如果没有食虫动物的保护，昆虫将使我们无法在这个世界上生存；它们会吃光我们的庄稼，杀死我们的牲畜。
我们非常感谢那些吃昆虫的鸟类和野兽，但所有这些动物加起来所消灭的昆虫数量，也只是蜘蛛消灭的一小部分。
而且，与其他一些食虫动物不同，蜘蛛绝不会对我们或我们的财物造成任何伤害。
蜘蛛并不是昆虫，也不像许多人认为的那样与昆虫有近亲关系。
几乎一眼就能看出区别：蜘蛛总是有八条腿，而昆虫最多只有六条。
那么，有多少蜘蛛在为我们做这项工作呢？
一位研究蜘蛛的权威曾对英格兰南部一块草地上的蜘蛛进行过统计，他估计每英亩有超过225万只蜘蛛；
也就是说，一个足球场上大约有600万只不同种类的蜘蛛。
蜘蛛每年至少有半年时间在忙着捕杀昆虫。
它们究竟消灭了多少昆虫，我们只能胡乱猜测，但它们是永不满足的食客，一天三顿饭根本不够。
据估计，蜘蛛在英国一年内消灭的昆虫总重量，超过了英国全国人口的总重量。
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 an insect never more than six.
How many spiders are engaged in this work on our behalf? One authority on spiders made a census of the spiders in a 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 million 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.
你可能会想，为什么蜘蛛应该是我们的朋友？
因为它们消灭了那么多昆虫，而昆虫中包括一些人类最大的敌人。
如果没有食虫动物的保护，昆虫将使我们无法在这个世界上生存；它们会吃光我们的庄稼，杀死我们的牲畜。
我们非常感谢那些吃昆虫的鸟类和野兽，但所有这些动物加起来所消灭的昆虫数量，也只是蜘蛛消灭的一小部分。
而且，与其他一些食虫动物不同，蜘蛛绝不会对我们或我们的财物造成任何伤害。
蜘蛛并不是昆虫，也不像许多人认为的那样与昆虫有近亲关系。
几乎一眼就能看出区别：蜘蛛总是有八条腿，而昆虫最多只有六条。
那么，有多少蜘蛛在为我们做这项工作呢？
一位研究蜘蛛的权威曾对英格兰南部一块草地上的蜘蛛进行过统计，他估计每英亩有超过225万只蜘蛛；
也就是说，一个足球场上大约有600万只不同种类的蜘蛛。
蜘蛛每年至少有半年时间在忙着捕杀昆虫。
它们究竟消灭了多少昆虫，我们只能胡乱猜测，但它们是永不满足的食客，一天三顿饭根本不够。
据估计，蜘蛛在英国一年内消灭的昆虫总重量，超过了英国全国人口的总重量。
重点词汇：
1. **Spiders** - 蜘蛛
2. **Insects** - 昆虫
3. **Destroy** - 消灭
4. **Enemies of the human race** - 人类的敌人
5. **Devour** - 吞食
6. **Crops** - 庄稼
7. **Flocks and herds** - 牲畜（羊群和牛群）
8. **Insect-eating animals** - 食虫动物
9. **Protection** - 保护
10. **A fraction of** - 一小部分
11. **Belongings** - 财物
12. **Authority** - 权威人士
13. **Census** - 统计
14. **Acre** - 英亩
15. **Football pitch** - 足球场
16. **Estimate** - 估计
17. **Hungry creatures** - 饥饿的生物
18. **The weight of all the insects destroyed** - 被消灭昆虫的总重量
19. **Human beings** - 人类
1. **Spiders** - 蜘蛛
2. **Insects** - 昆虫
3. **Destroy** - 消灭
4. **Enemies of the human race** - 人类的敌人
5. **Devour** - 吞食
6. **Crops** - 庄稼
7. **Flocks and herds** - 牲畜（羊群和牛群）
8. **Insect-eating animals** - 食虫动物
9. **Protection** - 保护
10. **A fraction of** - 一小部分
11. **Belongings** - 财物
12. **Authority** - 权威人士
13. **Census** - 统计
14. **Acre** - 英亩
15. **Football pitch** - 足球场
16. **Estimate** - 估计
17. **Hungry creatures** - 饥饿的生物
18. **The weight of all the insects destroyed** - 被消灭昆虫的总重量
19. **Human beings** - 人类
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 an insect never more than six.
How many spiders are engaged in this work on our behalf? One authority on spiders made a census of the spiders in a 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 million 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.