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
The ostrich, the largest bird in the world at present, lives in the drier regions of Africa outside the actual deserts. Because
admin
2010-01-09
109
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.
Normally, in every rainy season, the female ostrich produces about ______.
选项
A、12 eggs in her nest
B、18 eggs in her nest
C、20 eggs in her nest
D、30 eggs in her nest
答案
A
解析
推理计算题。根据第二段第一句和最后一句可知鸵鸟一个雨季约产20个蛋,它在其他鸟巢产了8、9个蛋后才回自己的巢里产蛋。所以答案为A。
转载请注明原文地址:https://kaotiyun.com/show/Fs3d777K
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
Generallyspeaking,aBritishiswidelyregardedasaquiet,shyandconservativepersonwhois【21】onlyamongthosewithwhomhe
Aspartofmorecomprehensivecomplianceandethicsprograms,manycompanieshaveformulatedinternalpoliciespertainingtothe
QueuingisnothingspecialinJapan.Everyday,televisionprogramsshowlonglinesofpeoplequeuingforuptoonehourevenin
Mostpeoplearefamiliarwithcomicbooksandcomicstrips.Thecomicstripisusuallyfoundindailynewspapers.Itismadeup
ManyUnitedStatescompanieshave,unfortunately,madethesearchforlegalprotectionfromimportcompetitionintoamajorline
Imagineaworldinwhichtherewassuddenlynoemotion—aworldinwhichhumanbeingscouldfeelnoloveorhappiness,noterror
Accordingtothepassage,theaverageI.Q.is______.
U.S.healthofficialsareincreasingsurveillancemeasuresatdoctors’officesandinternationalborderstoguardagainstthes
BelowisagraphshowingthepercentagesoftheaverageChinesecitizenexpensesondifferentitemsintheyear1995andtheyea
随机试题
何谓Tietze病
急性吗啡中毒的拮抗剂是
缺铁性贫血哪项化验可确诊
某工程投资500万元,每年可以生产产品1000件,产品的单价是6000元,则该工程的资金周转率是( )。
当磁盘设置写保护时,用户()磁盘。
A公司为增值税一般纳税人,适用的增值税税率为17%。A公司2014年和2015年有关资料如下:(1)A公司2014年1月2日以一组资产交换甲公司持有B公司60%的股权,并作为长期股权投资核算,能够对B公司实施控制,A公司另支付资产评估和法律咨询等费用60
下列关于专家的胜任能力、专业素质和客观性的说法中,正确的有()。
所谓依法从重,是指依照()的规定,在量刑幅度以内从重处刑。
ApioneeringstudybyDonaldAppleyardmadethesurprisingdiscoverythatasuddenincreaseinthevolumeoftrafficthroughan
WanttoKnowYourDiseaseRisk?CheckYourExposomeA)Whenitcomestohealth,whichismoreimportant,natureornurture?Youm
最新回复
(
0
)