单项选择题
A．one can choose his color preference B．one is born with his color preference C．one’s color preference is changeable D．one has to choose his favorite color as soon as he can see clearly
A．America is a highly developed country B．Americans are impatient and unfriendly people C．the fast pace in American life often causes much trouble D．American city people seem to be always in a rush
A．nobody was so able as to solve these problems B．many people were too selfish to think about others C．he was not in the position to solve such problems D．he already had more than enough work to do