单项选择题

According to the speaker, libraries are facing the problem of ______.

A．books are in poor condition
B．having too many books from the early 1800s
C．not having enough space to store government documents
D．having to import most of the paper they use

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单项选择题

The speaker mainly discusses ______.

A．the growth of the printing industry
B．the history of paper-making
C．the use of paper in the 19th century
D．the composition of wood fiber

单项选择题

Paper industry needed a new source of fiber in the early 1800s is because ______.

A．people wanted higher quality paper
B．paper made from rags deteriorated too quickly
C．wood pulp had become too expensive
D．the supply of rags was insufficient