TOEFL Listening: TPO-TOEFL听力TPO - 2Y11K8174K7F1PQ8R$

What are two points the professor makes about parchment? A. It is more long lasting than paper. B. It was inexpensive to produce during the Middle Ages. C. It was the material Archimedes used for his writings. D. Its use for books decreased after the 1400s.