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
Naturally, in a group of animals as diverse as the snakes, and with so many varied enemies, there are numerous defensive reactio
Naturally, in a group of animals as diverse as the snakes, and with so many varied enemies, there are numerous defensive reactio
admin
2018-05-11
27
问题
Naturally, in a group of animals as diverse as the snakes, and with so many varied enemies, there are numerous defensive reactions and devices. There is, however, one general pattern of behavior. In the presence of suspected enemy the first reaction is to try to escape observation; if this fails, the next resort is the flight to some inaccessible retreat, but if this is not possible, or is circumvented, various kinds of intimidatory gestures and warning devices are brought into play; in the last resort the snake attacks. This pattern varies with the circumstances; some stages may be omitted or combined unpredictably whilst all some notoriously irascible species may dispense with all the preliminaries and attack almost at once, though seldom or never without some provocation.
Amongst the factors that increase aggressiveness are hunger, the mating season and surprise, with the last mentioned the commonest; when hunting for food or for mate, activity and the aggressive instinct are both at their peak. Owing to their poor sense of hearing snakes are very liable to be, quite literally, caught napping and a similar situation arises during their periods of temporary blindness just before sloughing (蜕皮) begins. By far the greatest number of snake-bit accidents result from the unwitting disturbance of resting snakes, and this hazard is much increased with species that are well disguised and whose natural instinct is to trust to this concealment as their principal defense. As well as differences in aggressiveness between individuals of the same species according to the circumstances and conditions, there are also notable differences between species, even closely allied species; and the reports of those who have been attacked may understandably be lacking in objectivity. So it is impossible to forecast, even in outline, how any encounter will develop.
The Hamadryad, for example, is usually credited with being amongst the most aggressive of snakes, and there are many accounts of unprovoked attacks, yet on one occasion fourteen men and seven dogs passed and returned within two yards from a nest and no snake was seen although the female, which guards the nest, could not have been far away.
The author uses the example in the last paragraph to support his idea that______.
选项
A、snakes do not begin the aggressive act if it is not disturbed
B、some snakes are more aggressive and more ready to attack
C、it is hard to forecast whether and how snakes would attack
D、snakes often conceal themselves as their principal defense
答案
C
解析
第3段开头就有for example这个标志性的词组,表明这一句是为了支持上文的例子。结合第2段末句可知,第3段是为了证明其不可预测性的,故C正确。
转载请注明原文地址:https://kaotiyun.com/show/PdT7777K
0
大学英语六级
相关试题推荐
A、Sittingstill.B、Contactingpeople.C、Trainingimagination.D、Improvingskills.A说话人认为在现代社会中,人们最需要的是放慢步伐,集中注意力和静坐,A“静坐”与对话相符,为
VideogameshavebecomeincreasinglypopularinbotharcadesandtheaverageAmericanhome.Peopleofallagesandfromallwalk
EatingOurYoung[A]AtFeltonvilleSchoolofArtsandSciences,amiddleschoolinapoorneighborhoodofPhiladelphia,thescho
EatingOurYoung[A]AtFeltonvilleSchoolofArtsandSciences,amiddleschoolinapoorneighborhoodofPhiladelphia,thescho
DoBritain’sEnergyFirmsServethePublicInterest?[A]Capitalismisthebestandworstofsystems.Lefttoitself,itwillemb
DoBritain’sEnergyFirmsServethePublicInterest?[A]Capitalismisthebestandworstofsystems.Lefttoitself,itwillemb
A、AbouttheBigHits.B、TheHistoryofPop.C、TheRoadtoMusic.D、TodayinHistory.A短文提到,如果想听听艺人们自己所说,可收听名为AbouttheBigHits这
A、Photosarememorabletotheold.B、Exerciseimprovesmemoryandfocus.C、Elderlypeopleneedmoreprotein.D、Goodmemoriesbas
A、Thesignificanceof"punctuality."B、Thechangeofthevalueoftimeinhistory.C、Thehistoryofindustrialization.D、Thede
Dr.AlanHirschdesignssmellsforbusinesses.Hesaysthatitdoesn’ttakeawholelotofsmelltoaffectyou.Storeownerscan
随机试题
脑脊液中IgM曾高,常见于:()
血的营养滋润的作用体现在
患者男,65岁。诊断为肺炎入院,应用抗生素治疗后未见好转,3天后突然出现呼吸急促,烦躁,出大汗。体检:呼吸42次/分,血压98/70mmHg,脉搏102次/分,口唇发绀,双肺闻及水泡音。最可能是并发了
用于治疗肺气壅实之咳喘气逆、痰多的药物是( )。
已知某手机企业2002-2009年在手机新技术研发上的投入额,如表4—3所示。根据上述资料请回答:应用指数平滑法来建立预测模型时,关于平滑常数α的叙述,正确的是()。
根据概率和收益的权衡,风险厌恶者在投资时通常会选择()。
已知风险组合的预期报酬率为20%,国库券的收益率为5%,风险组合的标准差为30%,则资本市场线的斜率为()。
海国图志
19世纪70年代,标志着朝鲜开始沦为半殖民地的一项条约是()。
1925年2月24日,国父孙中山病危时,留下一段《家事遗嘱》:“余因尽瘁国事,不治家产。其所遗之书籍、衣物、住宅等均付吾妻宋庆龄,以为纪念。余之儿女已长成能自立,望各自爱,以继余志。此嘱。”中山先生艰苦奋斗40年,功勋卓然。但终身廉洁,
最新回复
(
0
)