首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Because they are beneficial insects. B、Because they destroy insects without hurting us in any way. C、Because they protect inse
A、Because they are beneficial insects. B、Because they destroy insects without hurting us in any way. C、Because they protect inse
admin
2010-10-28
84
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 pitch. (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
综合理解题 。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,第二段提到蜘蛛不属于昆虫,可排除A项。
转载请注明原文地址:https://kaotiyun.com/show/QBs7777K
0
大学英语六级
相关试题推荐
A、Justfiveminutes.B、Slightlylessthananhour.C、Betweenoneandtwohours.D、Alittlemorethantwohours.B
What’syourearliestchildhoodmemory?Canyourememberlearningtowalk?Ortalk?Thefirsttimeyou【C1】______thunderorwatch
What’syourearliestchildhoodmemory?Canyourememberlearningtowalk?Ortalk?Thefirsttimeyou【C1】______thunderorwatch
BillGates,thebillionaireMicrosoftchairmanwithoutasingleearneduniversitydegree,isbyhissuccessraisingnewdoubtsa
A、Idlenessismorepainfulthandullwork.B、Therichsuffermorethantheworkingpeople.C、Workisdesirabletoeverybody.D、O
A、Findajobworkingasareporter.B、Findthenewspapereditor.C、Prepareaneditorialforthisweek’snewspaper.D、Stayawake
UniversityRecruitingTheprosperousrecruitingAsitturnsout,thisseductionofcollegestudentsbyrecruitersatinv
Withmoreelectricalhouseholdappliancescomingintobeingduringthetwentiethcentury,_______________(妇女孩子花在做家务方面的时间比例大大减少了)
Fatherhoodisgoingtohaveadifferentmeaningandbringforthadifferentresponsefromeverymanwhohearsthesewords.Some
随机试题
兴奋性突触后电位是指在突触后膜上发生的电位变化为
哪些药物可用于诱发排卵
颈椎椎间盘CT扫描的层厚、层距通常为
患者,男,80岁。常年咳嗽,以干咳为主,咳声短促,痰少色白,偶有血丝,伴颧红,盗汗,神疲,舌红少苔,脉细数。该患者治疗时,宜首选
房地产开发项目竣工后,房地产开发企业应当向()提出竣工验收申请。
简述班级常规管理的基本内容。
一只猎豹锁定了距离自己200米远的一只羚羊,以108千米/小时的速度发起进攻,2秒钟后,羚羊意识到危险,以72千米/小时的速度快速逃命。问猎豹捕捉到羚羊时,羚羊跑了多少路程?()
(2007年试题,一)如图1一3—4,连续函数y=f(x)在区间[一3,一2],[2,3]上的图形分别是直径为1的上、下半圆周,在区间[一2,0],[0,2]的图形分别是直径为2的上、下半圆周,设则下列结沦正确的是()。
Object-oriented analysis(OOA)is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis
【B1】【B10】
最新回复
(
0
)