墨尔本PTE 阅读排序 2920

A - Their skulls, pelvises, and hind feet are reptilian. The anatomy of their wings suggests that they did not evolve into the class of birds. B - The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. C - Perhaps the least controversial assertion about the pterosaurs is that they were reptiles. D - How such large creatures, which weighed in some cases as much as a piloted hang-glider and had wingspans from 8 to 12 meters, solved the problems of powered flight, and exactly what these creatures were-reptiles or birds- are among the questions scientist have puzzled over.