A.discovered Cai Lun invented paper |
B.learned to make paper |
C.saw many wonderful things |
D.read a lot of books |
A.17th | B.15th |
C.13th | D.7th |
A.1,700 | B.2,000 |
C.2,800 | D.48,000 |
A.To use both sides of every piece of paper. |
B.To use the paper bags from shops more than once. |
C.To use cotton handkerchiefs instead of paper ones. |
D.To grow more trees. |
A.Saving Paper |
B.The History of Paper |
C.Cotton Handkerchiefs Back Again |
D.Cai Lun, the Great Inventor |