【单选题】

Hotlines have become common in China. Some radio broadcasting stations use hotlines to encourage the listeners to take part in the talk shows. 

    　　That's a good idea. Yet, the fact is, some people do nothing but break the whole programme. 
    　　Some people know little about the topic under discussion. Sometimes they do not even know what the host(主持人)is talking about. So the host has to tell the caller what the show is about .Usually the caller will ask a few questions which express his hope and show his ignorance(无知).Then the host has to answer and explain-how silly this is !It wastes a lot of time . 
    　　It seems that some people phone the hotlines in fun. They just want to let the listeners hear them. They don't care what the topic is , whether they themselves are interested in or how silly they appear to be. 
    　　I'm totally bored(厌烦)by those people . It's necessary for radio stations to improve the hotline programmes. In my opinion,  if a caller doesn't know what is going on,  the operator should not let the caller take part in it. 
    52. The sentence, "Some people do nothing but break the whole programme." may tell us that ______. 
    A. radio stations use hotlines in a wrong way B. it is a fact 
    C. it is a good idea D. some people have unclear thoughts 
    53. The host has to answer and explain, ____ . 
    A. for the host works hard B. because of the caller's ignorance 
    C. for the host likes talking to the caller D. because of a lot of questions raised by the caller 
    54. The passage doesn't tell us the idea ________ . 
    A. that some listeners phone the hotlines in fun 
    B. that some people just want to be heard by others 
    C. that some people who don't care what the topic is must have realized that they appear to be silly 
    D. what the hotline programmes are 
    55. Which of the following is not true? 
    A. Some people know little about the topic under discussion. 
    B. Some people do not know what the host is talking about 
    C. Some people do not know what the show is about 
    D. The writer tells us that the host is silly.