anchoretes

终于看出点眉目了，D之所以对是因为Skeptics also argue that the fusedclavicles (the “wishbone”) of birds differ from the unfused clavicles of theropods. 鸟的fused锁骨和恐龙的unfused锁骨不同，说明，恐龙没有fused锁骨，而B错是因为原文说
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.

黄色部分是这些持怀疑态度的科学家的观点，而绿色部分是作者的观点，作者认为不能这些科学家的观点还不能推翻，因为目前没有保留有关恐龙肺的化石