T-4-Q5-Q7

     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 find fossils 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.

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.

答案：E。这道题问题是什么意思呢？是问不置信鸟从恐龙进化来的那些人的观点呢？还是问这些不置信此观点的人所反对argue的观点呢？从E选项看好像是后者啊，可是为什么呢？帮分析下这道题的问题含义好吗？3Q！

D应该不对吧。原文是这样说的Skeptics also argue that the fused clavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods. 这些有不同意见的人说鸟和恐龙的这个clavicles不同，而D选项说这个很早的鸟没有clavicles。改变意思了。

大家的看法是什么呢？请发表下意见吧：）