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

According to the passage, where did diamonds first come into existence

A．In the volcanoes.
B．On the floor of the sea.
C．Under the river bed.
D．At the foot of the mountains.