(1)东汉时蔡伦发明“蔡侯纸”,对人类文明的进步产生了怎样的影响? ________________________________________________________________________________________________________________________________________________________________ (2)今天,人们大力提倡使用“再生纸”(将废旧纸张或纸制品回收,经过加工,重新制造出符合一定质量标准的纸),又有什么重要意义? ________________________________________________________________________________________________________________________________________________________________ |