单项选择题

Which of the following can reflect the ever-changing ethnic structure of America

A．Sportsman.
B．Audience.
C．Both of them.
D．None of them.
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单项选择题
The author of the passage wants to tell that ______.
A．Americans like sports and sports reveal much about the changing ethnic structure of the United States
B．in Washington, several games are played in one day
C．Americans like all kinds of games
D．the American games are watched by native-Americans and played by people from different countries
单项选择题
What is the main difference between an electronic book and a LCD screen
A．The power they need.
B．The portability they come to.
C．The convenience they make.
D．The content they store.
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