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 2,271,000 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.

重点单词 查看全部解释
engaged [in'geidʒd] 想一想再看
adj. 忙碌的，使用中的，订婚了的

spider ['spaidə] 想一想再看
n. 蜘蛛

related [ri'leitid] 想一想再看
adj. 相关的，有亲属关系的

protection [prə'tekʃən] 想一想再看
n. 保护，防卫
联想记忆 X 单词protection 联想记忆：
pro在前面+tect盖上+ion→保护
impossible [im'pɔsəbl] 想一想再看
adj. 不可能的，做不到的
adj.
联想记忆 X 单词impossible 联想记忆：
im不，无，非+plssible可能的→不可能的
authority [ə'θɔ:riti] 想一想再看
n. 权力，权威，职权，官方，当局

glance [glɑ:ns] 想一想再看
v. 一瞥，扫视，匆匆一看，反光，闪烁，掠过

fraction ['frækʃən] 想一想再看
n. 分数，小部分，破片
联想记忆 X 单词fraction 联想记忆：
fract=break打碎+ion→部分，小片，分数
pitch [pitʃ] 想一想再看
n. 沥青，树脂，松脂
n. 程度，投掷，球场
联想记忆 X 单词pitch 联想记忆：
pit小坑，ch吃：把路上的小坑吃了，用沥青填上就行了
census ['sensəs] 想一想再看
n. 户口普查
联想记忆 X 单词census 联想记忆：
census＝assess评估（人口）－人口普查