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
What evolutionary change in birds led to a nest’s building?
What evolutionary change in birds led to a nest’s building?
admin
2014-01-10
22
问题
What evolutionary change in birds led to a nest’s building?
Many egg-laying animals merely lay their eggs and leave. Turtles, for instance, and horseshoe crabs, the eggs are hatched and the little ones are on their own. The current theory about birds is the earliest birds did just that when they were cold-blooded creatures living in warm places. However, when they became warm-blooded creatures living in cold places, they had to remain on the eggs to keep them warm. For this, they needed a place—a nest. Very likely, the first nest was just a primitive hole scraped in the ground. Even now many species still lay eggs in this sort of crude nest. Primitive nests found on the ground were fine for some birds, but others began to elevate their nests in branches, perhaps to avoid predators. These early elevated nests were probably cup-shaped nest. This type is still built by some birds today. The latest development in nest, the most recent vision, so to speak, is the cup-shaped nest. This is the one we regard today as the typical bird’s nest, you know, like a robin’s nest.
选项
A、Their flying ability improved greatly.
B、They became warm-blooded.
C、They began to lay eggs.
答案
B
解析
文中此句For this,they needed a place—a nest中的For this是指上文when they be-came warm-blooded creatures living in cold places,they had to remain on the eggs to keepthem warm,故B项正确。
转载请注明原文地址:https://kaotiyun.com/show/DakK777K
本试题收录于:
D类竞赛(专科)题库大学生英语竞赛(NECCS)分类
0
D类竞赛(专科)
大学生英语竞赛(NECCS)
相关试题推荐
A.supplementedB.directC.expectationD.latterE.predominantlyF.outbreakG.laterH.sharplyI.abundanceJ.again
A.sothatB.wiseC.barelyD.exerciseE.groupF.describingG.thoughtH.probablyI.capabilitiesJ.assistanceK.
A.sothatB.wiseC.barelyD.exerciseE.groupF.describingG.thoughtH.probablyI.capabilitiesJ.assistanceK.
A.incomeB.polarizationC.transformationsD.oldE.changesF.worseG.relaxedH.therebyI.divisionJ.accompanying
ThreeTipstoImproveYourPublicSpeakingSkills1.Childrenasyoungas【T1】______:showandtell【T1】______Numberonefear:【T
ThreeTipstoImproveYourPublicSpeakingSkills1.Childrenasyoungas【T1】______:showandtell【T1】______Numberonefear:【T
ThreeTipstoImproveYourPublicSpeakingSkills1.Childrenasyoungas【T1】______:showandtell【T1】______Numberonefear:【T
HarvardPresident’sAddress:aDifferentLife1.Students’wonder■What【T1】______wouldbelike【T1】______2.
Lookingatwhathehasdoneforthosedisabledchildren,one______forgivehissin.
随机试题
A.从事医师执业活动B.中止医师执业活动C.申请执业医师注册D.不予医师执业注册E.注销执业医师注册受吊销执业医师证书行政处罚自处罚之日起满2年的
当教室里一片喧哗时,教师突然放低声音或停止说话,会引起学生的注意。这是()。
临床治疗肥胖很简单,改变生活方式和膳食结构也可以有效预防和治疗。()
膀胱憩室内结石应如何治疗______。
妇科检查描述正确的是
患者,男,27岁。心悸失眠,虚烦神疲,梦遗健忘,口舌生疮,舌红少苔,脉细数。治宜选用()
某甲系县政府干部,受其好友某乙之托,带领三个无业青年向某丙逼取赌债,见某丙不愿偿还,便将其关人一间偏僻小屋内,日夜实施辱骂、殴打。某丙被关七日,造成身体重伤、精神恍惚。事后,某甲幡然悔悟,投案自首。请问某甲构成何种犯罪,有几项法定量刑情节
均质土坝的土料是砂质黏土和壤土,要求其应具有一定的抗渗性和强度,其黏粒含量一般为()。
注册税务师刘某为某个体户代理建账的业务中,以下不正确的处理有()。
公平交易是指消费者在购买商品或接受服务时,有权获得质量保障、计价优惠和计量正确。()
最新回复
(
0
)