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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.

单项选择题Whom is the talk addressed to

A．Freshmen in the university.
B．Teachers of different backgrounds.
C．Students and teachers from computer college.
D．Regular MA students and in-service teachers.

单项选择题What is the topic of the man’s research paper

A．Egypt today.
B．Egyptian ancient history.
C．Egypt in 900-999.
D．Travel in Egypt.

单项选择题Which of the following about the 97% population is true

A．The data 'about the 97% population is rich.
B．Historians had a set of numbers indicating the date of their birth, marriage and death.
C．The 97% population had nothing that is worth of recording.
D．The data historians had presented a vivid picture of the 97% population.