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
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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
单项选择题
What message can we get from the last paragraph
A．American football might develop in different places.
B．American football is supposed to be changeable.
C．American football will have its own rules.
D．American football might see changes in the years to come.
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