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
It was previously believed that dinosaurs were cold-blooded creatures, like reptiles. However, a recent discovery has lad resear
It was previously believed that dinosaurs were cold-blooded creatures, like reptiles. However, a recent discovery has lad resear
admin
2010-04-12
30
问题
It was previously believed that dinosaurs were cold-blooded creatures, like reptiles. However, a recent discovery has lad researchers to believe they may have been warm- blooded. The fossilized remains of a 66 million-year-old dinosaur’s heart were discovered and examined by x-ray. The basis for the analysis that they were warm- blooded is the number of chambers in the heart as well as the existence of a single aorta (主动脉).
Most reptiles have three chambers in their hearts, although some do have four. But these that have four chambers, such as the crocodile, have two arteries (动脉) to mix the oxygen-heavy blood with oxygen-lean blood. Reptiles are cold-blooded, meaning that they are dependent on the environment for body heat. Yet the fossilized heart had four chambers in the heart as well as a single aorta. The single aorta means that the oxygen-rich blood was completely separated from the oxygen-poor blood and sent through the aorta to all parts of the body.
Mammals, on the other hand, me warm-blooded, meaning that they generate their own body heat end are thus mere tolerant of temperature extremes. Birds and mammals, because they are warm blooded, move more swiftly and have greater physical endurance than reptiles.
Scientists believe that the evidence now points to the idea that all dinosaurs were actually warm- blooded. Ironically, the particular dinosaur in which the discovery was made was a Tescelosaurus, which translates to "marvelous lizard." A lizard, of course, is a reptile.
The author implies that birds ______.
选项
A、move faster and have greater endurance than reptiles
B、move slower and have less endurance than reptiles
C、move faster and have greater endurance than dinosaurs
D、move slower and have less endurance than dinosaurs
答案
A
解析
根据第三段最后一句话“Birds and mammals,because they are warm blooded,move more swiftly and have greater physical endurance than reptiles,”鸟类和哺乳动物是恒温的,所以与爬行动物相比,它们移动的速度更敏捷,同时身体的忍耐力更强。只有A符合文中说法。
转载请注明原文地址:https://kaotiyun.com/show/Vuj7777K
0
大学英语四级
相关试题推荐
Ilovetravelingbytrain.Fast【B1】______,slowlocaltrainswhichstopateverystation,【B2】______trainstakingbusinessmen
Home.FewwordsintheEnglishlanguagehavesuchaspecialmeaning.Homeisaplacewhereyoucanrelax,kickbackandjustbe
A、Heseemstiredofdrivingfromhishometowork.B、Hepreferswalkingtodriving.C、Heissatisfiedwithdrivingfromhishome
Materialculturereferstowhatcanbeseen,held,felt,used--whatacultureproduces.Examiningaculture’stoolsandtechnolo
Women’sroleinpoliticshasbeenchanging.Duringthe【B1】______movement,womenbegantoplayanactiveroleinAmericanpolit
A、Hewantstoworkinatravelagencyinanothercity.B、Hehasnoidea.C、HewantstofindajobinITindustry.D、Hewantsto
Thenexttimeyouattendasocialfunctionorgotoaplacewherepeoplemeetandinteract,takenoteofthenumberofpeoplewh
A、Offerthemchancesofpromotion.B、Improvetheirworkingconditions.C、Encouragethemtocompetewitheachother.D、Givethem
ThreeYaleUniversityprofessorsagreedinapaneldiscussiontonightthattheautomobilewaswhatoneofthemcalled"PublicHe
Whetherleadersarebornormadehasbeenasubjectofintensedebatealmostsincethebeginningoftime.But,withcurrentmana
随机试题
求∫0+∞xe-xdx.
A.HBsAgB.抗HBgC.HBeAgD.抗HBeE.抗HBc乙肝疫苗的主要成分是
宪法规定,国家保护公民的下列哪些财产的所有权?()
大跨度厂房指跨度在15m以上的单层工业厂房,其中跨度为15~30m的厂房以钢结构为主。()
某公司为了提升公司的业绩,通过对外招聘的方式,招聘了一名新的业务经理小张,小张在笔试方面表现非常优异。公司对他寄予了厚望。此外,小张培养了一名得力助手,非常优待他,但是对其他员工要求非常的严格,而且并不喜欢采纳员工的意见,因而和下级相处的并不好。一年过去了
中国共产党领导的多党合作和政治协商制度是我国政治制度的特点和优点。()
在合理情绪疗法中,咨询师需要帮助求助者达到的领悟是()。
“审慎”是职业活动内在的道德准则之一,下列说法中,符合“审慎”的内在本质要求的是()。
1967年,有科学家在南极找到了一块属于两栖动物迷齿类的化石。有些人认为这就是大陆间连接的证据。1969--1971年在南极早三叠纪弗拉莫夫组地层中,找到了一个生活在两亿多年前的庞大的陆生动物群(即水龙兽动物群)。这个动物群,种类多、数量大。而更重要的是它
______isthestudyoflanguageinrelationtothemind.
最新回复
(
0
)