单项选择题

A．origins
B．stores
C．potentials
D．sources
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单项选择题
All books are cataloged according to
A．the author’s name.
B．the subject matter.
C．the publisher.
D．the title.
单项选择题
How many email messages did Americans send in 1999
A．2.2 billion.
B．2.2 million
C．293 million.
D．293 billion.
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