单项选择题

Questions 11 - 13 are based on the following talk about finding books. You now have 15 seconds to read Questions 11 - 13. All books are cataloged according to

A．the author’s name.
B．the subject matter.
C．the publisher.
D．the title.
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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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