TOEFL Reading: ETS-TOEFL阅读机经 - M93PR5335T53362CL$

In paragraph 2, why does the author discuss the Egyptian use of papyrus as a writing material? A. To describe the superiority of papyrus over leather and wood as a writing material B. To explain why writing in Egypt did not develop as quickly as it did Mesopotamia C. To explain why archaeologists' knowledge of the early history of writing relies mainly on Sumerian cuneiform D. To explain why the Sumerians preferred clay tablets for writing over papyrus