脂肪组织

赛车的左、右轮子距离为1.5米，当赛车沿一半径为10米的圆形跑道跑一圈时，外侧的轮子比内侧的轮子多走了______π米．

单机挂车时，在区间被迫停车后，开车前应对列车自动制动机进行全面试验。

正弦电压u=220根号2sinwt，在t=0时，有效值为零，最大值为零。

同轴式催化裂化装置的催化剂循环量可用塞阀调节，亦可用滑阀调节。

Questions 47 to 56 are based on the following passage.

Lance Armp 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 Austin, tested Armp 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 Armp’s (50) against the amount of oxygen he breathed. Doctor Coyle discovered an 8% increase in Armp’s muscle power. Doctor Coyle (51) Armp might have developed more of a certain kind of muscle during his seven years of training.
Doctor Coyle also discovered that Armp 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 Armp 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. Armp received chemical (54) and several operations on his brain. After he (55) , he began training again 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.

• A) bite
• B) study
• C) average
• D) suspected
• E) exercise
• F) beat
• G) unique
• H) survived
• I) performance
• J) recovered K) fixed L) departed
  M) frequentN) treatment O) breakthrough