帮忙再确认下这个谢谢啦 27、恐龙化石 考古学里面，有人不同意说鸟的祖先是某某恐龙，因为化石时间上不吻合。不过，后来发现了新化石，时间就吻合了。 又有人异议说，那种恐龙没有鸟的hollow bone，不过后来又挖到新化石了，就又证明了。 再有人异议说，鸟的lung和恐龙的lung结构不同，（鸟的适合高空飞嘛），这个目前还cannot say whether true or false, 因为没有相关化石。 有道题，我就选了lung。 还有问文章说明了什么，选了theory不一定是错的，只是化石发现时间比较慢。（by chensixu23）
考古已确认 Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced. They argue that theropods appeared too late to have given rise to birds, noting that Archaeopteryx lithographica – the oldest known bird – appears in the fossil record about 150 million years ago, whereas the fossil remains of various nonavian maniraptor theropods – the closest known relatives of birds – date only to about 115 million years ago. But investigators have now uncovered bones that evidently belong to nonavian maniraptors dating to the time of Archaeopteryx. In any case, failure to findfossils of a predicted kind does not rule out their existence in an undiscovered deposit. Skeptics also argue that the fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods. This objection was reasonable when only early theropod clavicles had been discovered, but fossilized theropod clavicles that look just like the wishbone of Archaeopteryx have now been unearthed. Finally, some scientists argue that the complex lungs of birds could not have evolved from theropod lungs, an assertion that cannot be supported or falsified at the moment, because no fossil lungs are preserved in the paleontological record.
题目T-4-Q5The primary purpose of the passage is toA. compare the development of two hypotheses concerning the evolutionary origin of birdsB. suggest revisions to the standard theory of the evolutionary history of birdsC. evaluate the usefulness of fossil evidence in determining the evolutionary history of birdsD. challenge the theory that birds evolved from ground-dwelling theropod dinosaursE. respond to criticisms of the theory that birds evolved from ground-dwelling theropod dinosaursT-4-Q6In the context of the passage, the phrase “fossils of a predicted kind”(line 16) most likely refers to which of the following? A. Theropod fossils with fused claviclesB. Theropod fossils that are similar in structure to Archaeopteryx fossilsC. Theropod fossils dating back more than 150 million yearsD. Fossils indicating the structure of theropod lungsE. Fossils indicating the structure of Archaeopteryx lungsT-4-Q7Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?A. There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.B. There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs’ lungs.C. Theropod dinosaurs appear in the fossil record about 150 million years ago.D. Theropod dinosaurs did not have fused clavicles.E. Theropod dinosaurs had certain bones that look just like those of Archaeopteryx.
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2012-12-7 13:49:25
楼主