WE ARE INFORMED BY THE AUTHOR THAT

38. - DE THI THU HAY CHON LOC DE THI THU TANH CO D AN 38. - DE THI THU HAY CHON LOC DE THI THU TANH CO D AN
DE THI THU HAY CHON LOC DE THI THU TANH CO D AN
38. We are informed by the author that: A. the dinosaurs appeared during the middle period. B. mammals and great reptiles both appeared at the same time. C. there were more than forty-five kind of great reptiles. D. ape-like men appeared before the last Ice Age.