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
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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
单项选择题
What do you think is the best title for this passage
A．How Is Diamond Formed And Found.
B．Diamond--A Precious Stone.
C．Diamond Hunting.
D．Diamond-Producing Countries.
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