首页
登录
职称英语
Scientists have determined that Archaeopteryx, the earliest known bird, was
Scientists have determined that Archaeopteryx, the earliest known bird, was
游客
2024-09-29
38
管理
问题
Scientists have determined that Archaeopteryx, the earliest known bird, was definitely birdbrained, meaning no disrespect. Indeed, they consider the fossil’s brain size decisive evidence that Archaeopteryx had what it took to fly.
The new research suggests, moreover, mat birds probably started flying millions of years earlier than scientists previously thought. It is just mat fossils of those first flying birds—predecessors of Archaeopteryx—have never been found.
The researchers, at the Natural History Museum in London, based their findings on the first X-ray examination and reconstruction of the braincase and inner ear of a 147-million-year-old Archaeopteryx specimen.
They found that in size, shape and volume, its brain was similar to that of the modern eagle or sparrow.
Measurements of the semicircular canals, the mechanism for balance inside the ear, showed that Archaeopteryx had the "neurological and structural adaptations necessary for flight," the scientists concluded.
Their research, involving an X-ray computed tomography scan, or C.T., of the fossil’s braincase and inner ear, is described today in the journal Nature.
Previous studies of the feathered wing and tail of Archaeopteryx and its birdlike anatomy, including a pronounced wishbone, supported the prevailing view of experts that it was capable of some degree of powered flight. Archaeopteryx is considered a prime transitional species in the evolution of some reptiles, probably dinosaurs, into today’s birds.
But the research team, led by Dr. Angela Milner, a paleontologist at the British museum, wrote that until their investigation of Archaeopteryx, "little was understood about the extent to which its brain and special senses were adapted for flight."
Dr. Milner said the new study not only established that Archaeopteryx was capable of "controlling the complex business of flying," but also showed "how much there is still to discover about when and how bird flight began."
In a statement issued by the museum, Dr. Milner said, "If flight was this advanced by the time Archaeopteryx was around, then were birds actually flying millions of years earlier than we’d previously thought?" [br] What is the original meaning of "birdbrained" and what does it mean here in the first paragraph?
选项
A、Naive; intelligent.
B、Simple-minded; volant.
C、Narrow-minded; navigational.
D、Stupid; adapted for flight.
答案
D
解析
birdbrained原指“愚蠢的”意思,但在本文中却是指具有适应飞行的能力。第1段最后一句表明始祖鸟拥有使其飞翔的东西,结合第4段“科学家总结,耳内控制平衡的半规管的测量显示始祖鸟拥有为了飞翔所必需的神经的和结构的相应改造”,我们可以得知,D为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3779883.html
相关试题推荐
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
ScientistshavedeterminedthatArchaeopteryx,theearliestknownbird,was
The"cloak"scientistshaveinvented[originaltext](26)Scientistshavecrea
Onethousand______scientistshavesignedthedeclarationsupportingresponsible
Veryfewscientists______completelynewanswerstotheworld’sproblems.A、come
Whatconclusioncanbedrawnfromthescientists’observation?[br][originalte
______isgenerallyaccepted,economicgrowthisdeterminedbythesmoothdevelop
WhatwerethescientistsworriedaboutsoonaftertheGulfWar?[br][originalt
随机试题
Dogswerefirstdomesticatedfromwolvesatleast17,000yearsago,butperh
Sleepispartofaperson’sdailyactivitycycle.Thereareseveraldifferentst
Theycomefrom_________________________.[originaltext]Everyyearwheredothou
企业的资源是有限的,消费者的需求是千差万别的。为了使有限的资源得到有效利用,从而
要刷新Windows2008系统的DNS解析器缓存,以下命令正确的是(
补益药宜在什么时候服用A.早、中、晚B.睡前C.饭后D.随时服用E.饭前
某公司于2017年1月1日发行3年期、到期一次还本付息债券,债券面值为20000
根据港口工程特点,对不计波浪力的建筑物在验算地基竖向承载力时,其水位采用()
期转现交易双方寻找交易对手时,可通过()发布期转现意向。A.IB.B.证券业协
根据支付结算法律制度的规定,下列各项中,关于票据提示付款期限说法正确的有()。A
最新回复
(
0
)