单项选择题

Lance Armstrong is thirty-three years old and is one of the best athletes in the world. Scientists say his body operates better than the (47) person. For example, his heart can (48) more than two hundred times a minute. It pumps an extremely large amount of blood and oxygen to his legs. Edward Coyle, head of the Human Performance Laboratory at the University of Texas in Aus tin, tested Armstrong five times from 1992 until 1995. Each time, the cyclist rode a (49) bike for twenty-five minutes with the work rate increasing every five minutes. Scientists measured Armstrong’’s (50) against the amount of oxygen he breathed. Doctor Coyle discovered an 8% increase in Armstrong’’s muscle power. Doctor Coyle (51) Armstrong might have developed more of a certain kind of muscle during his seven years of training. Doctor Coyle also discovered that Armstrong was able to reduce his body weight and body fat before his Tour de France victories. This enabled him to increase his power in relation to his body weight by 18%. Doctor Coyle says the results of the (52) show that long-term training has more of an effect on athletes than scientists thought. Lance Armstrong is (53) in another way. In 1996, when he was twenty-five, he discovered he had cancer of the testicles (睾丸), which had spread to his lungs and brain. Armstrong received chemical (54) and several operations on his brain. After he (55) , he began training a gain in 1998. The next year he won his first Tour de France race. Many people who have (56) and are living with cancer believe he is a hero. WORD BANK A) bite I) performance B) study J) recovered C) average K) fixed D) suspected L) departed E) exercise M) frequent F) beat N) treatment G) unique O) breakthrough H) survived