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职称英语理工A考试阅读判断练习:　概括大意与完成句子题

　　The science of Sport
　　1 At the 2004 Olympic Games in Athens， the Chinese athlete Liu Xiang equaled the world record for the 110 metres hurdles （跨栏） when he ran the race in 12.91 seconds. This record time had been set in 1993 by British sprinter （短跑运动员） Colin Jackson and 9 years went by before another athlete was able to run as fast.
　　2 Record-breaking in all track events is slowing down and we appear to be moving much closer to the limits of human performance. Nevertheless， every four years， records which were previously thought to be unbeatable are broken. So what's behind this never-ending improvement in performance？ And how long can we keep breaking records？ Is there a limit to human performance or will athletes continue to gain seconds？
　　3 Most experts agree that it isn't the athletes' bodies which have changed but the huge advances in sport science which have enabled them to improve their performances. The individual athlete obviously has to have the necessary skill and determination to succeed， but the help of science and technology can be significant. Research has brought a better underst

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