（1）What materials were used for paper-making？
A.Cotton and silk.
B.Bamboo and book.
C.Silver and steel.
（2）Why were books expensive before printing？
A.People didn't have chances to 1 earn how to read.
B.People had to spend their money on basic needs.
C.people could only produce books one at a time by hand.
（3）When did printing start to develop greatly？
A.At the start of the 11th century.
B.Around 2，000 years ago.
C.Right after the 11th century.
（4）What will the speaker talk about next？
A.When the computers were invented.
B.Whether paper books will be replaced.
C.What will take the place of paper books.