[多选题]正确认识理想与现实的关系是实现理想的思想基础。关于理想与现实的关系，正确的表述有（ ）。
A.理想与现实是对立统一的
B.现实规定并制约着理想
C.现实是理想的基础，理想是未来的现实
D.理想一定可以转化为现实

The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. 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 scientists have puzzled over.
Perhaps the least controversial assertion about the pterosaurs is that they were reptiles. Their skulls, pelvises, and hind feet are reptilian. The anatomy of their wings suggests that they did not e- valve into the class of birds. In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing like membrane. The other fingers were short and reptilian, with sharp claws. In birds the second finger is the principal strut of the wing, which consists primarily of feathers. If the pterosaurs walked on all fours, the three short fingers may have been em
A. They were unable to fold their wings when not in use.
B. They hung upside down from branches as bats do before flight.
C. They flew in order to capture prey.
D. They were an early stage in the evolution of the birds.