__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.

　　D．Running has changed in Jamaica.

　　E．Most of the country’s world class runners started out in the two leading track clubs.

　　F．Hard training and iron will is essential to be among the best in the world.

　　G．However，there is no evidence of such a gene.

　　【语篇导读】　本文主要讲了牙买加跑步运动员跑步快的原因。

　　1．D　[根据后文内容可以推断出跑步使得牙买加人的生活发生了变化，所以选D项。]

　　2．E　[根据前后文内容，空前讲“they are sent to track and field clubs”，空后讲“At school track meets crowd...”，由此可以推断出此处选E项。]

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