阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。<br class="bogusBR">    I tend to accept any idea put forward by experts on TV. One day, a sociologist proposed that the  31  society has been consuming modern humans little by little. For fear that I would become a victim of the consumer society, I  32  hurried to a bicycle shop in my neighborhood.  33  the shopkeeper Mr. Johnson was selling me the bicycle, he said, “This is the best thing you  34  have done. Life has become hopelessly  35  . A bicycle is simple, and it brings to you  36  things: fresh air, sunshine and exercise.” I agreed. Happy as a child, I got on the bicycle and headed out onto the streets. After some time, I  37  at the other end of the town. I was  38  that this simple vehicle could let me  39  long distances in a fairly short time. But how  40  did I really go、    Since I hated to be  41  , I went back to Mr. Johnson and asked him to  42  an odometer (里程表) on my bicycle. He agreed, but  43  , “An odometer without a speedometer (速度计) is like a  44  without a knife.” I admitted he was right and in a few minutes, the two devices (装置) were  45  to the handlebars of my bicycle. “What about a horn、” he then asked. “Look, this horn is no larger than a matchbox and has many  46  .” Attracted by these functions, I bought the horn.    “You can’t leave the back part  47  ,” noted Mr. Johnson. He fixed a metal box with buttons  48  the seat, and said, “Is there anything better than this oven when you feel  49  on your way、 I can give you a special discount.” I was not strong enough to  50  the offer.    “I congratulate you once more; this is the best thing you could have done,” said Mr. Johnson in the end.