单项选择题

Einstein and Russell died when ______.

A．their brains could not function efficiently any more
B．the full development of both sides of their brain was achieved
C．their bodies stopped working
D．they were very old

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单项选择题

American football comes from ______.

A．soccer
B．rugby
C．both soccer and rugby
D．neither soccer nor rugby

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