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
2023-10-21
37
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、How birds learn to build nests.
B、Why birds lay eggs.
C、How bird’s nests have evolved.
答案
C
解析
本文主要围绕鸟巢展开叙述,一开始,鸟类lay their eggs and leave;后来随着鸟类进化,需要一个nest。而nest刚开始建在地上,后来建在树上,由此可以看出整篇文章是讲鸟巢的演变,故C项正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3116210.html
相关试题推荐
[originaltext]W:GoodmorningGrahamandwelcometotheshow.M:Goodmorning,
[originaltext]W:GoodmorningGrahamandwelcometotheshow.M:Goodmorning,
[originaltext]W:GoodmorningGrahamandwelcometotheshow.M:Goodmorning,
[originaltext]W:GoodmorningGrahamandwelcometotheshow.M:Goodmorning,
[originaltext]W:Departmentofartdesignandmedia,canIhelpyou?M:Yes.[1
[originaltext]W:Departmentofartdesignandmedia,canIhelpyou?M:Yes.[1
[originaltext]W:Departmentofartdesignandmedia,canIhelpyou?M:Yes.[1
[originaltext]W:Departmentofartdesignandmedia,canIhelpyou?M:Yes.[1
[originaltext]W:Departmentofartdesignandmedia,canIhelpyou?M:Yes.[1
[originaltext]M:Hi.Mary.Howareyou?W:Fine,thanks.Howarethingsgoing?
随机试题
Salesclerk:Goodmorning,madam.CanIhelpyou?Customer:Goodmorning.【D8】______
IntheruinsofthePalmBeachHotelyougetapowerfulsensethatanerais
WhyisPaulaunhappy?[br][originaltext]M:Hello.W:Hello,Sam.ThisisPaula
InEurope,therehasbeenaseriousdeclineinphysicalactivityoverthepa
大型临时设施总面积超过(),应备有消防专用的消防桶、消防锹、消防钩、盛水桶(池
根据《建设工程安全生产管理条例》,在施工合同中,属于建设单位安全责任的有()。
属于特殊培养基的是A.SS琼脂B.营养肉汤C.伊红亚甲蓝琼脂D.巧克力琼脂平板E
运用头脑风暴训练法训练学生的思维所应遵循的原则有哪些?
钢材的化学成分中,可显著降低钢材的可焊性,增加钢的冷脆性和时效敏感性,降低抗大气
关于系统性红斑狼疮的叙述,不正确的是( )。A.青年女性多见 B.属于自身免
最新回复
(
0
)