In Jamaica，children start running at a very early age.When they get to school，teachers and athletic coaches watch them run and walk.Then，depending on their talent they are sent to track and field clubs.__2__

　　At school track meets crowds of teenagers get together to compete with each other.Running is very important in Jamaica and winning a national title or a school championship is something really big.

　　__3__

　　Another reason for Jamaica’s success on tracks around the world is food.A typical breakfast includes salt fish with yams，bananas and maybe a cup of tea.It contains carbohydrates which runners need to perform well.

　　__4__

　　They have long legs and little fat.Their narrow hips allow them to lift their knees higher when they run.Many scientists have been researching African and Caribbean runners in order to find out if they have a special gene that makes them faster than the others.__5__

　　The success of Bolt，Powell and others has triggered hype(天花乱坠的广告宣传)among Jamaican children.These are their idols and they want to be just like them.

　　A．A tough competition may be one of the reasons why Jamaicans are so good.

　　B．Nutritionists argue that the diet of Jamaican children is one of the keys to success.

　　C．Jamaican athletes are also built differently from non－blacks.

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