✔ 最佳答案
Here's the problem, your assuming that both events happened in the same timeline.
Yes a meteor hit earth of large mass but they may not have been what have killed the dinosaurs. It could have been the ice age, which is something that dragons may or may not have survived due to long hibernation cycles.
Or another theory is that dragons were dinosaurs and the dinosaurs were actually killed out in the medieval ages. Keep in mind the word dinosaur didn't come about until much later.
So dragons may have just been the word they used instead of dinosaur.