单项选择题

What is the main topic of the conversation

A．The difficulty of raising animals on farms in colonial America.
B．Traffic problems in colonial American cities.
C．Population growth in colonial American cities.
D．Economic conditions in colonial Americ

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单项选择题

According to the man, why do modern books decay

A．They are often handled improperly by readers.
B．The paper is destroyed by chemicals.
C．The ink used in printing damages the paper.
D．The glue used in the binding loses its strengt

单项选择题

What does the man say is a drawback to the process of restoring books

A．It's very expensive.
B．It hasn't proven to be totally effective.
C．It can be damaging to some books.
D．It can't be used on books published before 1850.