阅读理解。 Hotlines have become common in China. Some radio broadcasting stations use hotlines to encourage the listeners to take part in the talk show. Are you interested in hotline? That's a good idea. Yet, the fact is, some people do nothing but break the whole program . Some people know little about the topic under discussion. Sometimes they even do not know what the host 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. 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 for fun. They just want to let the listeners hear them. They do not care about what the topic is, whether they themselves are interested in or how silly they appear to be. I am really bored by those people. It is necessary for the radio station to improve the hotline program. In my opinion, if a caller does not know what is going on, the operator should not let the caller take part in it. Some young children phone the hotline in order to take part in games. Some radio or TV stations hold the hotline in order to get more money from the children. So if your phone fee goes up quickly suddenly, maybe your son or daughter often phone hotline. There is another hotline. Everyone likes it very much. It is the hotline for our life, such as Mayor Hotline in your city. 1. The underlined sentence 'some people do nothing but break the whole program' mainly tells us _____. [     ] A. radio stations use hotlines in a wrong way B. it is a fact C. some people have unclear thoughts D. it is a good idea 2. 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 author tells us that the host is silly. 3. The host has tto answer and explain ______. [     ] A. because he works hard B. because of the caller's ignorance C. because he likes talking to the caller D. because of a lot of questions raised by the caller 4. The passage does not tell us the idea ______. [     ] A. that some listeners phone the hotline for fun B. that some people just want to be heard by others C. that some people don't care how they appear to be silly D. what the hotline programs are 5. The Chinese meaning of the underline word 'operator' probably is _____. [     ] A. 导播 B.  听众 C.  医生 D. 主持人