填空题 In the United States there are six million tennis players and twelve{{U}} {{U}} 1 {{/U}} {{/U}}golfers. These figures would not surprise most people. But many would be{{U}} {{U}} 2 {{/U}} {{/U}}to learn that twenty million Americans{{U}} {{U}} 3 {{/U}} {{/U}}motorcycles. Few people realize that motorcycling is fast becoming{{U}} {{U}} 4 {{/U}} {{/U}}of America's most popular sports.
Many kinds of people enjoy motorcycling. They include blacks and{{U}} {{U}} 5 {{/U}} {{/U}}, businessmen, professionals, and blue-collar workers. According to the Cycle News,{{U}} {{U}} 6 {{/U}} {{/U}}reaches more than 50 000 readers each week, the average American motorcyclist is between the ages of twenty-one and thirty-five. He owns his own house, and has a wife, more than one{{U}} {{U}} 7 {{/U}} {{/U}},and at least one car. He is a responsible citizen.
Cycle Magazine, a monthly publication with almost 280000{{U}} {{U}} 8 {{/U}} {{/U}}, claims that approximately fifty-five per cent of American motorcyclists are businessmen,{{U}} {{U}} 9 {{/U}} {{/U}}three per cent in the professions and nine per cent in government service. Such informantion is offered by motorcyclists in the hope{{U}} {{U}} 10 {{/U}} {{/U}}improving the general public's impression of their{{U}} {{U}} 11 {{/U}} {{/U}}. The public has tended to believe that all motorcycles are ridden by wild, irresponsible, lawless young men.
There are several things{{U}} {{U}} 12 {{/U}} {{/U}}motorcycling that the average citizen dislikes. A cyclist's appearance has{{U}} {{U}} 13 {{/U}} {{/U}}to do with this dislike. Motorcyclists frequently look dirty; in fact, they are dirty. On the road there is little to protect them{{U}} {{U}} 14 {{/U}} {{/U}}mud, crushed insects,{{U}} {{U}} 15 {{/U}} {{/U}}bird droppings.{{U}} {{U}} 16 {{/U}} {{/U}}practical reasons they often dress{{U}} {{U}} 17 {{/U}} {{/U}}old clothing which looks much{{U}} {{U}} 18 {{/U}} {{/U}}respectable than the clothing of people who ride in cars. For the same reason motorcyclists usually wear dark colors. Perhaps this helps to explain{{U}} {{U}} 19 {{/U}} {{/U}}they are sometimes suspected of having evil natures. In old plays of long ago, evil characters usually wore black. In cowboy movies the "bad guys" usually{{U}} {{U}} 20 {{/U}} {{/U}}black hats while the "good guys" wear lighter colors.