阅读短文，回答问题。 Jason Queally is one of the fastest men in the world on bicycle. But do you really call the thing in the picture a bicycle? Well, yes, Jason's human-powered machine, With its two wheels, is, of course, a bicycle. Every year, a very important humanpowered bicycle is held in Nevada, USA.  The speed of a bike is measured (测定) for only 200-metres, but players take more than a kilometre to get their bikes going fast. Jason Queally's fastest speed for the 200metre race was 103.5 kilometres an hour. At this year's race, Jason failed to reach the finishing line. He was speeding along at about 70 kilometres an hour when he began to lose control of his bike. When he tried to slow down, it began to smoke.Soon the inside of his bike was filled with smoke.He couldn't see, and he couldn't breathe. At 70 kilometres an hour, a crash could be very serious. Jason was frightened, but he managed to stop the bike safely. He would rapair his bicycle and try again another time to be the world's fastest man on a bike. Better luck next time, Jason. Maybe you're surprised that these bikes go so quickly, but is it useful? It could be. Cars are becoming more and more popular, and they are very safe, comfortable and easy to drive, but they also pollute the air in our cities. Scientists and engineers are learning from fast racing bikes how to make human-powered vehicles that might be uesful for daily travel. 1. Is Jason's human-powered machine a bicycle? 2. How often is the human-powered bicycle race held in Nevada? ________________________________________________________________ 3. Did Jason stop his bike safely or was he badly hurt? ________________________________________________________________ 4. Why did he lose this year's race? 5. What is the best vehicle for daily travel like according to the writer? ________________________________________________________________