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、All the time. B、For most of the year. C、In the summer months. D、For a minimum of six months of each year. DHow often are spide
A、All the time. B、For most of the year. C、In the summer months. D、For a minimum of six months of each year. DHow often are spide
admin
2010-01-10
93
问题
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 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, 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, 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. 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、All the time.
B、For most of the year.
C、In the summer months.
D、For a minimum of six months of each year.
答案
D
解析
How often are spiders active in killing insects?
选项出现time, months, year等与时间有关的名词,可能提问发生的时间。
事实细节题。蜘蛛至少有半年的时间忙于消灭害虫,即D)“每年至少有六个月的时间”。
转载请注明原文地址:https://kaotiyun.com/show/bHdK777K
0
大学英语六级
相关试题推荐
TheBeijingPeaceInternationalHotelWeoffertravelersawealthoffeaturesthatpromptareturn
DearSir,Muchtomyregret,Iwritethislettertocomplainaboutyourcompany’sbaddeliveryservice.Thelaptop(modelnu
Thispartistotestyourabilitytodopracticalwriting.Youarerequiredtowriteabusinessletteraccordingtothefollowin
Inthesummerheat,it’seasytodeveloptheembarrassingproblemofbodyodorifyou’renotcareful.Bacterialivealloverou
Accordingtotherecent"Plansfor2004"survey,mostpeopleareunhappywiththeircurrentjobs.MaryLynMillersuggeststhat
A、Ithelpshertoattractmorepublicattention.B、Itimprovesherchanceofgettingpromoted.C、Itstrengthensherrelationship
Silvercarsaremuchlesslikelytobeinvolvedinaseriouscrashthancarsofothercolors,suggestsanewstudyofover1000
A、Itbecomesbigger.B、Itbecomesmoreexpensive.C、Itbecomescheaper.D、Itbecomesmuchsafer.CHowdoessiliconchipsbecome
A、Inaphotographer’sstudio.B、Inthelibrary.C、Inthepostoffice.D、Intheshoppingcenter.AWherearethephotosmuchcheap
A、Itisexpensive.B、Itisreasonablypriced.C、Itischeap.D、Itiseasilyaffordable.A
随机试题
A.照常活动,但应避免体力劳动,增加午休时间B.限制活动,多卧床休息C.加强锻炼,提高耐力D.绝对卧床休息,限制探望E.逐步离床,在室内缓步走动心功能一级患者()
男性,84岁,左半结肠切除术后第一天,呼吸困难。查体:神清,心率116次/分,呼吸36次/分,四肢活动自如,血气分析pH7.32,Pa023.6kPa(27mmHg),PaaCO6.27kPa(47mmHg),右肺呼吸音明显减弱,右肺可闻少量干性啰音及
工程咨询合同谈判时,可以选用或参考FIDIC编写的合同文本是()。
某工程设备安装阶段,需要使用起吊能力为lO吨的吊车进行大型永久设备的吊装。承包商与设备租赁公司签订施工机械租赁合同时,应依据《建设工程安全生产管理条例》,要求该设备租赁公司提供()。
残疾人社会工作是围绕残疾人个人、家庭、群体以及相关的社会组织和社区开展的( )活动。
认知重建特别适用于下列哪些情况:()。
Thetopicofvirtualviolenceinvideogamesresultinginreallifeaggressionhaslongbeencontroversial—andmanycourtshave
Inthetwodecadesbetween1910and1930,overtenpercenttotheBlackpopulationoftheUnitedStateslefttheSouth,whereth
Identicaltwinspossessexactlythesamesetofgenes.Yetastheygrowolder,theymaybegintodisplaysubtledifferences.The
中国特色社会主义
最新回复
(
0
)