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
56
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
Throughouthistorymanhasobservedsuchnaturalcyclesastherisingandsettingofthesun,theebbandflowoftheoceantide
A、Theyhavecomparedanimalbehaviorswithhumans.B、Theyknewhowtoavoidearthquakes.C、Theytriedmanywaystodecreaseeart
AreTeenagersReallyCarelessAboutOnlinePrivacy?[A]Theyshare,like,everything.Howtheyfeelaboutasong,theirmathshom
A、They’restillsearchingforeffectivewaysblindly.B、They’reatalosshowtomakee-bookssmallenough.C、They’veloweredth
Itisclearthathumanhistorywillend:theonlymysteryiswhen.Itisalsoclearthatifthetimingislefttonature(or,if
Researchonanimalintelligencealwaysmakesuswonderjusthowsmarthumansare.Considerthefruit-flyexperimentsdescribedb
DoBritain’sEnergyFirmsServethePublicInterest?[A]Capitalismisthebestandworstofsystems.Lefttoitself,itwillemb
DoBritain’sEnergyFirmsServethePublicInterest?[A]Capitalismisthebestandworstofsystems.Lefttoitself,itwillemb
DoBritain’sEnergyFirmsServethePublicInterest?[A]Capitalismisthebestandworstofsystems.Lefttoitself,itwillemb
A、Itmustbesimpleenoughtounderstand.B、Itshouldbecreativeandunique.C、Itshouldbeshowninainconspicuousway.D、It
随机试题
在Windows的资源管理器中,利用“编辑”菜单中的“重命名”既可以对文件改名,也可以文件夹改名。
既能清热解暑,又能收湿敛疮的药物是
管理方格法中的任务管理是指()
患者赵某,女,37岁,患慢性胆囊炎,入院择期行腹腔镜下胆囊摘除术。胆囊造影前一日晚上,患者饮食应为
中药提取液精制方法有
企业采用公允价值模式对投资性房地产进行后续计量,下列说法中正确的有()。
野生动物保护组织:没有买卖就没有杀戮;没有杀戮,人与自然才能和谐相处。如果以上陈述为真,以下哪一项陈述一定为真?
小张夫妇想买套房子,经过一番挑选,目标锁定某座楼的3套房。已知:这三套房子中有一套是B户型,另一套位于25楼,第三套面积为156平方米。A户型不在19楼,C户型也不在32楼。150平方米的房子不在19楼。145平方米的不是A户型。150平方米的不是C户型。
ManyforeignerswhohavenotvisitedBritaincallalltheinhabitantsEnglish,fortheyareusedtothinkingoftheBritishIsle
It’sHardtoCleanBigDataA)KarimKeshayjee,aTorontophysiciananddigitalhealthconsultant,crunchesmountainsofdatafro
最新回复
(
0
)