首页
登录
职称英语
What evolutionary change in birds led to nest building? [br] [originaltext] M
What evolutionary change in birds led to nest building? [br] [originaltext] M
游客
2024-10-16
55
管理
问题
What evolutionary change in birds led to nest building? [br]
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、A primitive type of nest.
B、An elevated nest.
C、A typical cup-shaped nest.
D、A nest of twigs and branches.
答案
A
解析
语义理解题。讲到早期的鸟巢是建在地面上时,讲话者接着举例说:“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.”可知讲话者举例是想说明一些比较粗糙原始的鸟巢。选项A为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3803188.html
相关试题推荐
Whatevolutionarychangeinbirdsledtonestbuilding?[br][originaltext]M
Whatevolutionarychangeinbirdsledtonestbuilding?[br][originaltext]M
Whatevolutionarychangeinbirdsledtonestbuilding?[br][originaltext]M
Whatdoesthewordpoppyinthispassagereferto?[br][originaltext]No
Whatdoesthewordpoppyinthispassagereferto?[originaltext]November
Whatwillbemosteffectiveaboutpersonalinterviewing?[br][originaltext]
Whatwillbemosteffectiveaboutpersonalinterviewing?[br][originaltext]
Whatwillbemosteffectiveaboutpersonalinterviewing?[originaltext]Pers
Thisbookdealswithquestions______China’sAgrarianRevolutionaryWar.A、conce
Whatcanweknowabouttheelephantsinzoos?[br][originaltext]Theeight
随机试题
Wheredoesthisconversationprobablytakeplace?[originaltext]M:I’dliketoo
ThissectionmeasuresyourabilitytounderstandacademicpassagesinEnglish.T
TheBritishconstitutionis_____alargeextentaproductofthehistoricaleve
Spittinginpublichasbecomesociallyreprehensible-andevencriminal--
Somepeople’searsproducewaxlikebusylittlebees.Thiscanbeaproblem
在眼的折光系统中,折射能力最大的界面是A.空气-角膜前表面 B.角膜后表面-房
以下哪一种肛肠疾病没有脱出的症状A、低位直肠有蒂息肉 B、肛周脓肿 C、脱肛
A.靴型心 B.梨形心 C.三角烧瓶状心 D.心尖部矛盾运动 E.心浊音
下列哪一选项不可能是左侧立体图形的视图? A.如上图所示 B.如上图所示
下列关于科技常识的表述,不正确的是:A.纳米是一种长度单位,1纳米=10-10米
最新回复
(
0
)