In the U．S．，the public has tended to believe that all motorcycles are ridden by wild，irresponsible lawless young men．

  There are several things about motorcycling that the average citizen dislikes．A cyclist’s appearance has something to do with this dislike．Motorcyclists frequently look dirty；in fact，they are dirty．On the road there is little to protect them from mud，crushed

insects．and bird droppings．For practical reasons they often dress in

old clothing which looks much less respectable than the clothing of people who ride in ears．For the same reason motorcyclists usually wear dark colors．Perhaps this helps to explain why 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 wear

black hats while the“good guys”wear lighter colors．Something else about their appearance makes an unfavorable impression．In their practical，protective clothing they look very much like the men on military motorcycles in the movies of World War II―cruel enemies who roared into peaceful villages filling people’s hearts with fear．

    Probably t11e machine itself also produces anger and fear．Motorcycles are noisy，though some big trucks are even noisier．But trucks are big and carry heavy loads；they are accepted(if not really welcomed)because they perform a needed service，making America move．Motorcycles，on the other hand，make all unpleasant noise just to give their riders pleasure．That is what is commonly thought．In the woods motorcycles frighten animals．Roaring along quiet streets，they wake sleeping families and make babies cry．

    Of course the danger of motorcycling also helps account for many people’s low opinion of the sport．Its defenders，however，claim that careful cyclists are in less danger than commonly believed．

A cyclist must drive as if everybody around him wanted to kill him．He must pay careful attention to his driving．From that point of view．a man oil a motorcycle is safer than a man in a car．

71．According to the passage．the average Americans believe that         ．

    A．motorcyclists are all blue―collar workers

    B．motorcycling has become one of America’s most popular sports

    C．only wild，irresponsible，lawless young men enjoy motorcycling

    D．motorcyclists can’t  afford to buy cars

72．From the passage we know that good characters of old American movies       ．

    A．usually wore lighter colors

    B．had no difference from evil characters

    C．1ooked gracious

    D．often rode horses

73．It can be inferred that       ．

    A．there existed different opinions towards motorcycling sport

    B．all good guys in cowboy movies wear white

    C．animals in the woods like motorcycles because motorcyclists usually feed crushed insects to hem

    D．motorcycles will make noise as soon as people go to sleep

74．Some people claim that a man on a motorcycle is safer than a man in a car because        ．

    A．car race is a sport with several disadvantages

    B．motorcyclists must drive very carefully

    C．most people want to keep a distance from the dirty motorcycles for fear that they should lose dignity

    D．motorcycles tend to be accepted by more and more people

75．The average citizen dislikes the motorcyclists because         ．

    A．all motorcycles are wild young men

    B．all motorcycles are irresponsible young men

    C．all motorcycles are lawless young men

    D．they frequently look dirty，they often make an unpleasant noise，and their appearance contributes to people’s terrible imagination