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 decay.
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单项选择题
From the first paragraph, we know ________.
A．InfraGard is a protective measure against cyber crime
B．InfraGard is a measure of cooperation and collaboration
C．there will be 50 InfraGard chapters in all states
D．private business and the government are now committing cyber crime
单项选择题
The expression pitch in with (Line 2, Para. 2 ) probably means ________.
A．complain
B．enjoy
C．help
D．deny
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