新概念英語第四冊(cè)(含lrc文本)Lesson 2 Spare that spider

[ti:δ?] [ar:] [al:] [by:https://www.lrc.com.cn] [00:22.04]Lesson 2 [00:22.81]Spare that spider [00:24.59]Why,you may wonder,should spiders be our friends? [00:28.79]Because they destroy so many insects, [00:31.25]and insects include some of the greatest enemies of the human race. [00:35.59]Insects would make it impossible for us to live in the world; [00:39.22]they would devour all our crops and kill our flocks and herds, [00:43.24]if it were not for the protection we get from insect eating animals [00:47.47]We owe a lot to the birds and beasts who eat insects [00:50.65]but all of them put together kill only a fraction of the number destroyed by spiders. [00:56.16]Moreover,unlike some of the other insect eaters, [00:59.34]spiders never do the least harm to us or our belongings. [01:04.03]Spiders are not insects,as many people think,nor even nearly related to them. [01:09.67]One can tell the difference almost at a glance, [01:12.51]for a spider always has eight legs and an insect never more than six. [01:17.96]How many spiders are engaged in this work on our behalf? [01:21.83]One authority on spiders [01:23.34]made a census of the spiders in a grass field in the south of England, [01:27.71]and he estimated that there were more than 2,250,000 in one acre; [01:34.28]that is something like 6,000,000 spiders of different kinds on a football pitch. [01:39.79]Spiders are busy for at least half the year in killing insects. [01:44.25]It is impossible to make more than the wildest guess at how many they kill, [01:48.72]but they are hungry creatures,not content with only three meals a day. [01:53.77]It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year [01:59.69]would be greater than the total weight of all the human beings in the country.

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