单项选择题

A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books deteriorate.
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单项选择题
A．Ask someone to help the man.B．Give the man the note for his reference.C．Lend the man her pencil and paper.D．Feel sorry that she can’t help the man.
A．Ask someone to help the man.
B．Give the man the note for his reference.
C．Lend the man her pencil and paper.
D．Feel sorry that she can’t help the man.
单项选择题
A．4,500.B．4,000.C．3,500.D．3,000.
A．4,500.
B．4,000.
C．3,500.
D．3,000.
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