首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
医学
A、How birds learn to build nests. B、Why birds lay eggs. C、How birds’ nests have evolved. D、Why some birds’ nests are considered
A、How birds learn to build nests. B、Why birds lay eggs. C、How birds’ nests have evolved. D、Why some birds’ nests are considered
admin
2013-12-06
21
问题
Many egg-laying animals merely lay their eggs and leave. Turtles for instance, the eggs 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 to 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 lays her in some pebbles along the edge of the parking lot just outside this building. Primitive nests 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 loose platforms of sticks and twigs—the types still built by ospreys and most Arians today. The latest evolvement in nest, the most recent version, 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.
Questions 26-30 are based on the passage you have just heard.
26. What is the main topic of the Passage?
27. What evolutionary change in birds led to nest building?
28. According to the speaker, where were the first bird’s nests located?
29. What is the killdeer’s nest in parking lot an example of?
30. According to the speaker, what is a possible reason that birds began to build nests in trees?
选项
A、How birds learn to build nests.
B、Why birds lay eggs.
C、How birds’ nests have evolved.
D、Why some birds’ nests are considered primitive.
答案
C
解析
纵观全文,可知本文讲的是鸟巢的演化过程。
转载请注明原文地址:https://jikaoti.com/ti/xCNDFFFM
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
High-speedlivinghasbecomeafactoflife,andthefranticpaceistakingitstoll,accordingtosciencewriterJamesGleick.
Despitegrowingnumbersofjoggers,CanadaFitnessSurveysacrossthecountrydemonstratethatCanadiansarelessphysicallyfit
Anenormousnumberofpeopleintheworld’spoorestcountriesdonothavecleanwateroradequatesanitation______.
A、Tovisithisson.B、Toperformanoperation.C、Tohaveanoperation.D、Tosendhissonforanoperation.C男士讲到自己是儿子Ricky开车送来的,
TherewereredfacesatoneofBritain’sbiggestbanksrecently.Theyhadacceptedatelephoneordertobuy$100,000worthof
A、WhenhisBMIisat23rdpercentileorabove.B、WhenhisBMIisat75thpercentileorabove.C、WhenhisBMIisat95thpercenti
Everyonehasseenithappen.Acolleaguewhohasbeenexcited,involved,andproductiveslowlybeginstopullback,loseenergy
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassicalandmedievalworlds,whiledur
A、Fishermeneatathome.B、Fishermentellfairtalestohisfamilymembers.C、Fishermenfrequentlyinventstories.D、Fishermeno
A、Becausehehadfeltseverepainonbothsidesoftheabdomen.B、Becausehecouldnotstandtheintolerablepainintheback.C
随机试题
患儿,男,8个月,体重8kg。腹泻3天,大便呈水样,无腥臭味,每日腹泻10余次,伴频繁呕吐。患儿精神欠佳,皮肤弹性差,前囟、眼窝明显凹陷,8小时未排尿,测血钠138mmol/L,医嘱给予静脉补液。考虑该患儿腹泻原因是()
计算建筑物折旧额时,按使用建筑物而产生的磨灭或破损以及风吹日晒的侵蚀和自然灾害造成的的损坏来计算折旧,称为()。
编制预算定额时,在正常情况下,机械台班消耗量中机械幅度差的内容包括()。
票据一经背书转让,票据上的权利也随之转让给()。
审计范围是指注册会计师为实现会计报表审计目标应当实施以及认为有必要实施的审计程序。( )被审计单位销货采用托收承付结算方式,于 2005年12月30日发货给A公司,货款50万元,2005年12月31日办妥托收手续,确认收入入账。2006年1月10日收
必须更加注重改革的系统性、整体性、协同性,让一切劳动、知识、技术、管理、资本的活力竞相__________,让一切创造社会财富的源泉充分__________,让发展成果更多更公平惠及全体人民。依次填入画线部分最恰当的一项是()。
根据以下资料,回答问题。2011年来华留学生(不含港、澳、台地区,下同)总人数比上年增长27521名,同比增幅为10.38%。其中自费生总人数266924名,比上年增长24224名,其他均为中国政府奖学金生,共计25687名。按国家统计,2
巴西火蚁目前在美国南部大量滋生。与巴西的火蚁不同,美国的火蚁一巢中有两只蚁后,这种火蚁比一巢中只有一只蚁后的火蚁更有侵略性,它们几乎消灭了其巢穴附近的所有昆虫以独占食物来源,因而火蚁的数量迅速增长。在巴西由于火蚁的天敌能限制火蚁的数量,所以把这些天敌引进美
有以下程序 #include<stdio.h> main() {chars[]="012xy\08s34f4w2"; inti,n=0; for(i=0;s[i]!=0;i++) if(s[i]>=’0’&&s[i
Fordecades,AmericanshavetakenforgrantedtheUnitedStates’leadershippositioninthedevelopmentofnewtechnologies.The
最新回复
(
0
)