All over the world people enjoy sports. Sports help to keep people healthy and happy, and to live longer.
51 They buy tickets or turn on their TVs to watch the games. Often they get very excited when their player or team wins.
52 Football, for example, has spread around the world. Swimming is popular in all countries near the sea or in those with many rivers. What fun it is to jump into a pool or lake, whether in China, Egypt or Italy! 53 Think how many lovers to skate or ski in winter in Japan, Norway or Canada.
Some sports or game go back thousands of years, like running or jumping. Chinese wushu, for example, has a very long history. But basketball and volleyball are rather new. Neither one is a hundred years old yet. 54 Water-skiing is one of the newest in the family of sports.
People from different countries may not be able to understand each other, but after a game together they often become good friends. 55 One learns to fight（奋斗） hard and fight fair(公平的), to win without pride and to lose with grace. (胜不骄败不馁)
A．And think of people in cold countries.
B．Sports help to train a person’s character(性格).
C．Not a few people participate in different sports competitions themselves.
D．Many people like to watch others play games.E. People aren’t inventing new sports or games.
F. Some sports are so interesting that people everywhere take part in them.
G. People are inventing（发明） new sports or games all the time.
51 ______ 52 ______ 53 ______ 54______ 55______
缺失，
近中倾斜，
间邻面接触关系不佳，该处牙龈肿胀，探诊易出血，探诊深度4mm，无自发出血现象。牙龈反复肿痛的原因最可能是（）