单项选择题

A．People living in the United States.
B．People living in the United States and Canada.
C．Scientists living in the United states and Canada.
D．Everyone but experts living in Canada.
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单项选择题
A．By desk-top computer terminals.B．With the help of a librarian.C．By the old card catalogue system.D．By the microfiche.
A．By desk-top computer terminals.
B．With the help of a librarian.
C．By the old card catalogue system.
D．By the microfiche.
填空题
In the past, public works was decided by______.
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