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
The ostrich, the largest bird in the world at present, lives in the drier regions of Africa outside the actual deserts.Because o
The ostrich, the largest bird in the world at present, lives in the drier regions of Africa outside the actual deserts.Because o
admin
2012-01-19
45
问题
The ostrich, the largest bird in the world at present, lives in the drier regions of Africa outside the actual deserts.Because of its very long,powerful legs and the floating effect of its extended wings,it is able to run at great speed over considerable distances.
The female ostrich normally produces about twenty eggs every rainy season. When the female ostrich begins to lay her eggs, however, she does not begin in her own nest.Instead she goes off in search of the nests of neighboring females and lays two or three eggs in each of them.By the time she has laid eight or nine eggs,she returns and lays the rest in her own nest.
Because of the size of the eggs, the female ostrich cannot lay more than one every two days,so it takes her three weeks to finish laying in her own nest.During that period, she spends a lot of time away from her nest looking for food.And while she is off her nest, other females visit it to lay their eggs amongst hers.By the time she is ready to sit on the eggs to hatch them, there could be up to thirty eggs in her nest, over half of which are not her own.
The female ostrich can comfortably cover only about twenty eggs when she is sitting on the nest, so before settling down she pushes the surplus ten or so eggs out of the nest.The rejected eggs, however, never include any of her own.Each female is remarkably consistent in the size and shape of the eggs she produces, so it is not difficult for her to distinguish her own from those of strangers.
Of all the eggs laid by a colony of ostriches, only a very small number hatch into young birds.There are times when nests are left unprotected, for there are too few males to sit on all the nests at night.Thus there are ample opportunities for their natural enemies to raid the nests and eat the eggs.In fact,nearly 80% of the nests are destroyed.But even if a particular female’s nest suffers this fate, there is a good chance that one or two of her eggs will be hatched in the nest of one of her neighbors.
The female switch identifies her own eggs by their size and______.
选项
A、color
B、number
C、shape
D、weight
答案
C
解析
细节题。从第四段中“Each female is remarkably consistent in t11e size and shape of the eggs she produces, so it is not difficult for her to distinguish her own from those of strangers.”可知,每只鸵鸟蛋的大小和形状都非常一 致,因此雌鸵鸟很容易区分自己的蛋和其他鸵鸟的蛋。因此,鸵鸟是根据 大小和形状来区分的,故选[C] 。
转载请注明原文地址:https://kaotiyun.com/show/3Jjd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfasta
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfasta
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfasta
MostradioandtelevisionstationsintheUnitedStatesarecommercialstations,【C1】______istosay,theyearntheirmoneyfrom【
AninterestingtheoryineconomicsisdemonstratedbytheHeadManofasmallmountaintribe.Itseemsthatthistribewasvery
WhatisMr.Bush’smainpurposeofthetrip?
Oneoftheearliestchangesexperiencedbynewlymodernizingcountriesisthereductionofinfectiousdiseasethroughthediffus
BetweentheeighthandeleventhcenturiesA.D.,theByzantineEmpirestagedanalmostunparalleledeconomicandculturalreviva
WhatisCareersAdvisoryOfficer’sjob?
JackEverytimeyouraiseahot-buttonissue,suchasthein-lawsormoney,doesyourhusbandsuddenlyclamup?Takeheart,m
随机试题
人类创造出来的一切物质产品和非物质产品的总和,被称为()
患儿女性,2岁,因“发热1天伴惊厥1次”入院。入院前1天受凉后出现发热,体温38.1℃左右,伴有流涕,轻咳嗽,无咳痰、气促,无呕吐、无腹痛、无腹泻,家属自行给予布洛芬糖浆口服,体温仍波动在37.1~38.2℃。今天上午患儿突然出现意识不清,两眼上翻,脸色苍
十二烷基硫酸钠卵磷脂
可行性研究阶段的建设方案设计对投资估算误差有何深度要求?
下列公司组织机构中关于公司职工代表的表述中,不符合《公司法》规定的是()。
H公司目前生产和销售甲、乙两种产品,现准备开发新产品丙或新产品丁。有关资料如下:资料一:甲、乙两种产品的单位售价分别为2元和10元,销售量分别为50000件和30000件,边际贡献率分别是20%和10%,H公司目前全年的固定成本为45000元。
下述租船合同范本中,属于航次租船的有()。
以下不属于化学学习过程的诊断方法的是()。
设总体X,Y相互独立且都服从N(μ,σ2)分布,(X1,X2,…,Xm)与(Y1,Y2,…,Yn)分别为来自总体X,Y的简单随机样本.证明:S2=为参数σ2的无偏估计量.
A、想睡觉B、眼睛难受C、昨天哭了D、生病了A女的发现男的眼睛红红的,所以问男的“昨天又开夜车了吧?”,可知男的昨天晚上没有睡觉,男的回答说“眼睛都睁不开了”,说明男的很困,想睡觉,所以选A。
最新回复
(
0
)