单项选择题

American football comes from ______.

A．soccer
B．rugby
C．both soccer and rugby
D．neither soccer nor rugby
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单项选择题
The brain works much more efficiently when ______.
A．both sides of the brain are used equally
B．the left side is fully developed
C．scientists work on it
D．the right side is fully developed
单项选择题
When the two colleges first met to play football , the players followed ______.
A．the rules of soccer
B．the rules of rugby
C．different rules
D．college rules
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