阅读下面短文，从短文后所给各题的四个选项中，选择最佳选项。 'Dreams may be more important than sleep. We all need to dream.' some scientists say. Dreams take up about one quarter of our sleeping time. People have several dreams each night. Dreams are like short films.They are usually in colour. Some dreams are like old films.They come to us over and over again. That may be because the dreamer is worrying about something. Dreaming may be a way of trying to find an answer. Some people get new ideas about their work from dreams. They may have been thinking about their work all day. These thoughts can be carried over into dreams. Sometimes we wake up with a good feeling from a dream. But often we can't remember the dream. Dreams can disappear quickly from memory. Too much dreaming can be harmful. The more we sleep, the longer we dream. The mind is hard at work when we dream. This is why we may have a long sleep but we feel tired when we wake up. 1. If Jack slept eight hours last night, there was about dream in the night. [     ] A. a two-hour B. a one-hour C. a one-quarter D. an eight-hour 2. Why do some people often dream about their work? [     ] A. Because they are happy in the daytime. B. Because they are not interested in their work. C. Because they may be this thinking about their work all day. D. Because they have too much work to do. 3. The main idea of the passage is that . [     ] A. what a dream is B. people like to sleep C. dreams are like films D. we always remember dreams