中国大学MOOC: Before the invention of paper, what had been used as writing material?
举一反三
- Before the invention of the paper, ( ) were used as the materials for writing. A: oracle bones B: bamboo slips C: silk D: computer
- _____ had been used in the front of costumes for several thousand years before the Ming dynasty.
- According to the article, what kinds of material have been used in brake pads and brake discs?
- When was paper used as a writing medium?
- 中国大学MOOC: Alice had never been abroad before, ______ she found the business trip very exciting.