首页
登录
职称英语
What evolutionary change in birds led to nest building? [originaltext] Many eg
What evolutionary change in birds led to nest building? [originaltext] Many eg
游客
2023-11-15
67
管理
问题
What evolutionary change in birds led to nest building?
Many egg-laying animals merely lay their eggs and leave. Turtles for instance, leave their eggs to hatch on their own. The current theory about birds is that 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. The process we call incubation. For this they needed a place--a nest. Very likely the first nests were just primitive depressions scrape into the ground. Even now many species still lay eggs in this sort of crude nests. In fact every spring a mother killdeer will lay her eggs in some pebbles along the edge of the parking lot just outside the buildings in the cities. Primitive nests on the ground were fine for some birds but other birds began to elevate their nests in branches perhaps to avoid predators. These early elevated nests were probably loose platform nests, like a robin’s nest.
选项
A、Their flying ability improved greatly.
B、They became warm-blooded.
C、They began to lay eggs.
D、They changed their migration patterns.
答案
B
解析
语义理解题。短文的开篇提到:“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.”可知鸟类需要建巢就是因为它们变成了温血动物,需要鸟巢来孵卵。迭项B为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3188624.html
相关试题推荐
FoodwasteinSeattleisfinallymadeintoakindof[br][originaltext](11
FoodwasteinSeattleisfinallymadeintoakindof[br][originaltext](11
FoodwasteinSeattleisfinallymadeintoakindof[originaltext](11)Int
Themanstopstotakehisdogoutsidetodoexercisebecause[br][originaltext
Themanstopstotakehisdogoutsidetodoexercisebecause[originaltext]M:Th
HowmanyapartmentswillbebuiltinHarHoma?[originaltext]Israelhasanno
Whichfonmswasthebasisforphotography?[br][originaltext]Thecamerais
Whichfonmswasthebasisforphotography?[br][originaltext]Thecamerais
WhatisthefindingofHarvardUniversity’sstudy?[br][originaltext]Astu
WhatisthefindingofHarvardUniversity’sstudy?[originaltext]Astudyfro
随机试题
Theproblemof______toselectashissuccessorwasquicklydisposedof.A、what
[originaltext]W:Hi,Mike,doyouhaveaminutetospare?M:Yes,Sherry,howc
关于移动通信系统的移动交换中心,下列表述正确的是()。A.移动交换中心作用是对区
A
在CPU和主存之间设置高速缓存(Cache)的目的是解决()的问题。A.主
男孩9岁,来自农村。今晨起感双下肢无力,疼痛不能行走,6小时后双上肢也出现无力,
怀疑肛管直肠肿瘤,最简单而重要的检查是A.乙状结肠镜检查 B.直肠指诊 C.
共用题干 方先生今年38岁,月平均工资5000元;方太太36岁,月平均工资60
实质教育论
关于节水与水资源利用,《循环经济促进法》规定,国家鼓励和支持使用再生水。《绿色施
最新回复
(
0
)