单项选择题
A．so are monkeys B．no one is left-handed C．scientists don't know why D．we never use left hands
A．are left-handed B．are right-handed C．can use both hands equally well D．never use left hands
A．all the people are right-handed B．life is hard fbr left-handed people C．left-handed people can't live D．there is another left-handed world