首页
登录
职称英语
What evolutionary change in birds led to a nest’s building? [br] [originaltext]
What evolutionary change in birds led to a nest’s building? [br] [originaltext]
游客
2024-08-22
11
管理
问题
What evolutionary change in birds led to a nest’s building? [br]
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、A hole scraped in the ground
B、Cup-shaped nest
C、Platforms of sticks and dried leaves
答案
B
解析
从倒数第二句The latest development in nest,the most recent vision,so to speak,is thecup-shaped nest.可知鸟巢的最新形式是杯状。
转载请注明原文地址:https://tihaiku.com/zcyy/3731070.html
相关试题推荐
Wheredidthethiefstealthecarsfrom?[br][originaltext]W:...andnowtolo
Wheredidthethiefstealthecarsfrom?[br][originaltext]W:...andnowtolo
Wheredidthethiefstealthecarsfrom?[br][originaltext]W:...andnowtolo
Whataretheytalkingabout?[br][originaltext]W:Hi,Tony.How’sthenewjob
Whataretheytalkingabout?[br][originaltext]W:Hi,Tony.How’sthenewjob
WhydoesRuthcallJackie?[br][originaltext]W:Hi,Jackie!We’regoingtoaf
Howwillthepricebedetermined?[br][originaltext]M:HowshouldIpricethes
Howwillthepricebedetermined?[br][originaltext]M:HowshouldIpricethes
Howwillthepricebedetermined?[br][originaltext]M:HowshouldIpricethes
Howwillthepricebedetermined?[originaltext]M:HowshouldIpricethesecalc
随机试题
[originaltext]FlexibleworkinghourswereinventedinGermanyinthelate19
某基金经理持有债券组合价值为1.2亿元,久期为6。现在拟将债券组合额度提高到2亿元,久期调整为7,则可使用的操作方法有()。A、卖出1.2亿元的债券资产
[originaltext]W:It’sreallyabigproblemtoteachourchildrenhowtobehave.
Apatrolteamofsealionsanddolphinsfeaturedinalarge-scalemilitarye
--Wherearethechildren?Thedinner'sgo
竣工(预)验收应对并联电容器组外技术参数进行检查核对。竣工验收应核查并联电容器组
已知A物重力的大小P=20kN,B物重力的大小Q=30kN.滑轮C、D不计质量,
局部用药治疗龋病的适应证A.小而浅的乳牙龋 B.大而浅的乳牙龋 C.大而深的
下列关于人力资本投资理论的说法中,错误的是( )。A.人力资本概念将人力即人的
对有延迟裂纹倾向的球形储罐的焊接接头,无损检测应在焊接完成( )后进行。A.8h
最新回复
(
0
)