根据短文内容，从短文后的选项中选出能够填入空白处的最佳选项，选项有两个为多余项。
In China some radio broadcasting station use hotline to encourage the listeners to take part in the talk shows.
__小题1:__Yes,the fact is some people do nothing but break the whole programme.__小题2:__Sometimes they do not even 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 questions which express his hope and show his ignorance. The host has to answer and explain ---how silly this is.! __小题3: ___It seems that some people phone the hotlines in fun. __小题4:__ They don’t care what the topic is, whether they themselves are interested in the topic or how silly they appear to be.
__小题5:___ In my opinion, if a caller does not know what is going on ,the operator should not let the caller take part in it.
A．Radio broadcasting stations use hotlines in a wrong way
B．That is a good idea
C．It waste a lot of time
D．Some people do not know what the show is aboutE.Some people know little about the topic under discussion
F.They just want to let the listeners hear them
G.It is necessary for radio broadcasting to improve the hotline programmes
