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
44
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:http://tihaiku.com/zcyy/3116501.html
相关试题推荐
PASSAGEONE[br]WhatisthemajorchangetoAppleWatch?Appscanrunindepende
[originaltext]W:Goodmorning,John.IamLucy.M:Goodmorning.W:Howareyou
[originaltext]W:Goodmorning,John.IamLucy.M:Goodmorning.W:Howareyou
[originaltext]W:Hi,John,itisgoodtoseeyou.M:Samehere,Nancy.Ithasb
[originaltext]W:Hi,John,itisgoodtoseeyou.M:Samehere,Nancy.Ithasb
[originaltext]LeadTimeLeadtimei
[originaltext]SleepwalkingSleepwal
[originaltext]HowtoImproveYourReadi
[originaltext]W:Choosingtheperfectpresentforyourlovedonescanbestress
[originaltext]W:Choosingtheperfectpresentforyourlovedonescanbestress
随机试题
Ahundredyearsagoitwasassumedandscientifically"proved"byeconomists
Secondlanguageteachingshouldfocusonencouragingacquisition,andonpr
[originaltext]A"blogger"isapersonwhowritesonanInternetcomputerwe
该设计是()A.随机区组设计 B.混合设计 C.拉丁方设计 D
大气污染状况监测中,下列哪一项不是点源监测的布点方法()A.捕捉烟波采样
拆除模板支架、脚手架时,施工现场应采取()等措施,确保拆除施工安全。A、拆除现
氯霉素的不良反应中与剂量和疗程无关的是A.再生障碍性贫血 B.灰婴综合征 C
证券公司开展定向资产管理业务,应当按照有关规则了解客户的()A:财产与收入状况
土的含水率试验以( )为室内试验的标准。A.烘干法 B.轻型或重型击实法
天然地基岩层层面产状要素包括()。A、走向 B、褶皱 C、断裂 D、
最新回复
(
0
)