The mayor of a Spanish town once tried to use free air passage and housing to ________.

A．She is not to blame.
B．She will accept the responsibility.
C．It was her fault.
D．She will be more careful next time.

A．To introduce the categories of books in the US libraries.
B．To explain roles of different US libraries.
C．To define the circulation system of US libraries.
D．To demonstrate the importance of US libraries.