The Chinese shake off their poor qualifying effort to repeat as champions. Japan, which originally finished fourth, wins an appeal and claims silver. Britain is third to win its first medal since 1912.LONDON — The Chinese men, who seemed sluggish and unenthusiastic when they qualified only sixth among the eight teams that advanced to the gymnastics team final, came out Monday with fist-pumping enthusiasm and finished with arms linked after owning the pommel horse on their last rotation and defending the Olympic gold medal they had won four years ago in Beijing.