单项选择题

A．One.
B．Two.
C．Three.
D．Four.
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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.
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.
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.
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