单项选择题
A．he wore the stars and stripes B．be never had a beard C．he had no hair D．he wore a bow tie
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 com
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