A、Police. B、Some outside authority. C、Heavier taxes on cigarettes. D、Natural elements. B

F: Of course we ought to be permitted to think, speak and feel as we like, provided we don’t do any harm to anyone else.
M: How do you know when you’re doing harm or not? Would you permit people to take drugs, for example?
F; That depends on the drugs. Some of them can be harmful in all sorts of ways—like too much drink, and smoking as many cigarettes as you do.
M: Well, I have been trying to give up smoking for a long time, but you know it is not easy and I’m afraid I don’t have that strong will.
F: I think the government should ban smoking in all the public places and they should levy heavier taxes on selling and buying cigarettes.
M: What really makes me mad is the attitude towards morals. Some people are really shocked because in the theatres today actors are allowed to walk about the stage with little or without any clothes on, and they think it’s right that the police should be able to walk into art galleries and decide whether pictures are works of art—or obscene. But these same people aren’t shocked by advertisements which persuade the public to buy things which can do real harm— like cigarettes and alcohol, for example. I think a lot of advertisements are much more immoral than so-called pornographic, or "dirty", plays and books, because they lie—or at least disguise the truth.
F: How do you know that pornographic pictures and books don’t do harm?
M: I didn’t say they did no harm. I’m just suggesting that the whole question of morality is relative. I think the behaviour of some businessmen is relatively more immoral than that of some of the young people they criticise.
F: You seem to think that everything will be all right if you just allow people to be natural. I personally feel we all need some kind of outside authority to help us discipline ourselves.
Question No. 27 What has the man been trying to do for a long time?
Question No. 28 According to the man, what things can do real harm to people?
Question No. 29 Why does the man think that advertisements are much more immoral than "dirty" plays and books?
Question No. 30 According to the woman, what do we need to discipline ourselves?