首页
登录
职称英语
[originaltext] Why, you may wonder, should spiders be our friends? (26)Beca
[originaltext] Why, you may wonder, should spiders be our friends? (26)Beca
游客
2023-09-02
69
管理
问题
Why, you may wonder, should spiders be our friends? (26)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. (27)We owe a lot to the birds and beasts which 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, (26)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, (28)for a spider always has eight legs and insect never more than six.
How many spiders are engaged in this work in 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 pitcll. (29)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.
选项
A、Because they are beneficial insects.
B、Because they destroy insects without hurting us in any way.
C、Because they protect insect-eating animals.
D、Because they include some of the greatest enemies of the human race.
答案
B
解析
目的原因题 。蜘蛛可以帮助人类消灭一些害虫,并且不会对人类造成危害。同时,后文提到蜘蛛不属于昆虫,可排除A 。
转载请注明原文地址:http://tihaiku.com/zcyy/2979504.html
相关试题推荐
[originaltext]Everyartistknowsinhisheartthatheissayingsomething
[originaltext]Everyartistknowsinhisheartthatheissayingsomething
[originaltext]MostAmericansbelievesomeoneisn’tgrownupuntilage26,
[originaltext]PeopleinPolandtaketheirpleasureseriously.Theyliketo
[originaltext]PeopleinPolandtaketheirpleasureseriously.Theyliketo
[originaltext]M:Well,you’veaskedaratherstrangepersonaprettystandardq
[originaltext]M:Well,you’veaskedaratherstrangepersonaprettystandardq
[originaltext]W:I’vejustfinishedreadingSteve’slistofwaysofmotivating
[originaltext]W:I’vejustfinishedreadingSteve’slistofwaysofmotivating
[originaltext]Oneofthemaincomplaintsofcityresidents,notsurprisingl
随机试题
Caffeine,thestimulantincoffee,hasbeencalled"themostwidelyusedpsy
[originaltext]M:DoyouthinkJanetwillspendtheweekinthecountrywithus?
[originaltext]Oneofthegreatestheartbreaksforfirefightersoccurswhen
Forthispart,youareallowed30minutestowriteashortessaybasedonth
对于工频电压升高,以下说法正确的是A.一般而言,工频电压开高对220kV等级以下
胃及十二指肠溃疡可用A.阿托品 B.东莨菪碱 C.哌仑西平 D.山莨菪碱(
动火工作票各级审批人员和签发人的安全责任有()。 A.工作的必要性
案例3.变电站设备年检工作中人身触电死亡。 2009年5月15日,X单位按计划
某新建商场总建筑面积为6000㎡,室内净空4.0m,采用石膏板吊顶,设计采
完工和在产的划分方法中使实际成本脱离定额的差异完全由完工产品负担的是( )。A
最新回复
(
0
)