Scientists have determined that Archaeopteryx, the earliest known bird, was

游客2024-09-29 30

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] In the sixth paragraph, here "anatomy" means

选项 A、body.
B、fossil.
C、analysis.
D、skeleton.

答案 D

解析 anatomy意思有：“解剖(学)；具体分析；骨骼”等等。根据文章第6段的第1句“之前关于始祖鸟羽毛翅膀和尾巴以及它类似鸟类骨骼(包括明显的叉骨)的研究，支持专家们公认的观点，即它能做某种程度的有力的飞行。”我们可以从该词后面的说明判断此处意思是“骨骼”。所以D为正确答案。

转载请注明原文地址:http://tihaiku.com/zcyy/3779886.html

相关试题推荐

随机试题

最新回复(0)

Scientists have determined that Archaeopteryx, the earliest known bird, was

Hewas______determinedthanyou,butheturnedouttobethefirsttobackout.A

Veryfewscientists_________completelynewanswerstotheworld’sproblems.A、c