单项选择题

What is the average age of a game player

A．20.
B．29.
C．19.
D．39.
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单项选择题
Who did NOT attend the conference on educational games
A．Game designers.
B．Publishers.
C．Government officials.
D．Teachers.
单项选择题
Who is NOT at the top of the complex hierarchy of a newspaper
A．The Executive Editor.
B．The Assistant Editor.
C．The Managing Editor.
D．The Editor and his deputy.
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