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
2017-02-01
59
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.
A snake is most aggressive when _____.
选项
A、it meets a possible enemy
B、it is caught when it is sleeping or sloughing
C、it is disturbed unknowingly
D、it seeks a partner in the mating season
答案
D
解析
第2段首句中第2个分句的mate一词与选项D同义,因此选项D为本题答案。其他选项都在文中提到过,也是蛇会对敌人实施还击的情况,但是这三个干扰项和正确选项之间的区别就在于,文中没有提到在这些情况下“A snake is most aggressive(蛇最具有攻击性)”,因此本题要紧扣第2段首句和其中的peak这个单词。
转载请注明原文地址:https://kaotiyun.com/show/JEU7777K
0
大学英语六级
相关试题推荐
A、TheArctic.B、TheWestAntarctic.C、Thenorthernhemisphere.D、Thesouthernhemisphere.B文中谈到,在过去气象专家更多地关注北极而现在却更多地关注南极西部地区。因此
Afterdecadesofdecline,theshareofmotherswhostayhomewiththeirchildrenhas【C1】______risenoverthelastseveralyears,
Forthispart,youareallowed30minutestowriteanessayondirectandindirectexperiencebyreferringtothesaying"You’ll
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals,butthisislar
PresidentBarackObama’spicktoheadtheEnvironmentalProtectionAgency(EPA),LisaJackson,hasspent20yearsasanenvironme
PresidentBarackObama’spicktoheadtheEnvironmentalProtectionAgency(EPA),LisaJackson,hasspent20yearsasanenvironme
A、It’sopenonlytoteachersandpostgraduates.B、Hecanstudythereifheiswritingaresearchpaper.C、Seniorstudentscanen
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphere
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofraysfromthesunandotherstars.Theatmosphere
A、Thedirectorprobablyisn’tabletomakeanexception.B、Thedirectorprobablywon’tseeher.C、Thedirectorusuallyisn’tver
随机试题
AⅠ期BⅡ期CⅢ期DⅣ期E0期子宫前壁肉瘤侵及腹腔组织,分期为
叶酸的主要食物来源有
关于胶片感光银盐的叙述,错误的是
进行会计电算化操作,要严格遵守计算机的操作程序,并遵循()的要求。
按情绪状态可把情绪分为()。
测量
材料:教师在“人的性别遗传”教学设计中,教学目标确定如下:知识与技能:(1)说明人的性别差异是由性染色体决定的,了解人的性别与基因的关系;(2)能说出男女体细胞及生殖细胞中含有的染色体数目与类型;(3)能解释生男生女机会均等的原因。过程与方法:
道德楼宇的重建,除了靠制度地基,更要靠个体道德践履的“________”。因为,道德构筑,需要你我他的身体力行,在公德的修复链中,没人能________。填入画横线部分最恰当的一项是:
下列选项中属于我国社会法部门的有()。(2013多47)
设有如下关系表:则下列操作中正确的是
最新回复
(
0
)