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
What is the percentage of Americans aging six and older who play computer and video games
A．15.
B．50.
C．8.
D．39.
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