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
外语
The first birds appeared during late Jurassic times. These birds are known from four very good skeletons, two incomple
The first birds appeared during late Jurassic times. These birds are known from four very good skeletons, two incomple
admin
2004-12-30
124
问题
The first birds appeared during late Jurassic times. These birds are known from
four very good skeletons, two incomplete skeletons, and an isolated feather, all from
the Solnhofen limestone of Bavaria, Germany. This fine-grained rock, which is
extensively quarried for lithographic stone, was evidently deposited in a shallow
(5) coral lagoon of a tropical sea, and flying vertebrates occasionally fell into the water
and were buried by the fine limy mud, to be preserved with remarkable detail In this
way, the late Jurassic bird skeletons, which have been named Archaeopteryx, were
fossilized. And not only were the bones preserved in these skeletons, but so also
were imprints of the feathers. If the indications of feathers had not been preserved in
(10) association with Archaeopteryx, it is likely that these fossils would have been
classified among the dinosaurs, for they show numerous theropod characteristics.
Archaeopteryx were animals about the size of a crow, with an archeosaurian type of
skull, a long neck, a compact body balanced on a pair of strong hind limbs, and a
long tail. The forelimbs were enlarged and obviously functioned as wings.
(15) Modern birds, who are the descendants of these early birds, are highly
organized animals, with a constant body temperature and a very high rate of
metabolism. In addition, they are remarkable for having evolved extraordinarily
complex behavior patterns such as those of nesting and song, and the habit among
many species of making long migrations from one continent to another and back
(20) each year. Most birds also have very strong legs, which allows them to run or walk on the
ground as well as to fly in the air. Indeed, some of the waterbirds, such as ducks and
geese, have the distinction of being able to move around proficiently in the water, on
land, and in the air, a range in natural locomotor ability that has never been attained
(25) by any other vertebrate.
选项
A、nesting materials
B、four skeletons in good condition
C、two fragmented skeletons
D、a single feather
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/xsyO777K
0
托福(TOEFL)
相关试题推荐
Youshouldspendabout20minutesonQuestions1-13,whicharebasedonReadingPassage1below.Attitud
RunningonemptyArevolutionarynewtheoryinsportsphysiology.AForalmostacentury,scientistshavepresum
Youshouldspendabout20minutesonQuestions1-14.CREATIVETOYSABathtimeanimalsFivefoammix-and
Youshouldspendabout20minutesonQuestions1-13,whicharebasedonReadingPassage1below.AverybriefhistoryoftimeTh
Timekeeper:InventionofMarineChronometerA.Uptothemiddleofthe18thcentury,thenavigatorswerestillunabletoexa
InwhichyeardidtheSPIintroducetherecyclingsymbol?
Completethesentencesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.EffectsofweatheronmoodTheyexpecttofindth
Fuelis(any)substanceormaterial(thatreacts)chemically(with)anothersubstanceormaterialtoproduce(hot).
Whydidthepottersdiscussedinthepassagechangethekindofpotterytheymade?Thephrase"derivedfrom"inline19isclo
A、Shewishesshecouldtakeadifferentclass.B、Shehasalreadyreadmostoftheassignedbooks.C、Thestudentsdon’thavetor
随机试题
在Windows中,“开始”菜单“文档”选项中的文件可以是文本文件、Word文件,也可以是BMP文件或其他文件。()
肝性脑病患者禁用的灌肠液是
色甘酸钠抗变态反应的作用机制是
男性,44岁,有咳嗽、咳痰史5年,伴喘息,入院前3天因受寒咳嗽、喘加重,咳黄痰入院。入院时查体,桶状胸,叩诊过清音,肺肝浊音界右锁骨中线第7肋间,双肺干、湿性哕音及散在哮鸣音,肺功能:FEV1/FVC为56%,MVV60%,VC降低,RV/TLC为43%。
当感抗小于容抗时,则电压滞后电流,电路呈( )。
按CIF术语成交的合同,货物在运输途中因火灾被焚,应由()。
下列关于公积金个人住房贷款业务的职责分工的表述,正确的有()。
()已经成为了现代社会保障的核心内容。
新航路开辟后,导致欧洲封建主收入下降的原因是()。
Ifartseekstodivorceitselffrommeaningfulandassociativeimages,ifitholdsmaterialaloneasitsobjective,thenIthink
最新回复
(
0
)