Wyatt Baldwin has been playing rock,paper,scissors(剪刀) since he was a kid.The game helped him settle disagreements with his three older sisters.“I never got the chance to pick what we watched on TV until I learned the sport of rock,paper,scissors,” he says. Baldwin is president of the World Rock Paper Scissors Association.He has played in and hosted competitions all around the globe.He once had a 43-game winning streak.What is the secret to his success?“Look for patterns in either your opponent's moves or behavior,” he says.As all serious rock,paper,scissors players know,there's more to the game than luck. People have been playing rock,paper,scissors for about 2,000 years.It is played everywhere.Some cultures use different hand symbols,but the idea is the same.You and an opponent each “throw” one of three hand symbols.You win,lose,or tie(不分胜负).Many people think the game is all luck.It seems that your chances of winning and losing are about the same,but the outcome of the game is not random.That's because human behavior isn't random.There are patterns in how people make decisions. A study at Zhejiang University,in China,looked at how people played rock,paper,scissors.It followed 360 students in a competition.Researchers found two key patterns.Winners tended to repeat their winning hand symbols.Losers tended to go from rock to paper to scissors. Knowing the psychology of the game is not a sure ticket to winning,but it can help.Ken Watson is one of the world's best rock,paper,scissors players.He says winning takes skill.“You have to size up your opponent.” Luck and chance play a part,but “you have to be prepared and have a strategy,” he says.“Part of my strategy is being confident.” According to Baldwin,“practice,practice,practice” is the key to success.“You can try practicing against yourself in front of a mirror,” he says.“But for me,that always ended up in a tie.” The support of rock,paper,scissors enabled little Wyatt Baldwin to .A. cut paper with scissorsB. reach an agreement with his sistersC. learn the sports on TVD. produce TV shows with his sisters