完形填空。先通读下面短文，读懂大意。然后从后面各题所给的A、B、C、D四个选项中选择可以填入相应空白处的最佳选项。
You without doubt sleep every day, but do you have a dream every night? How much do you know about dreaming? “Sleep are 1 than dream. We all need to dream.” some scientists say.
Dreams take up about one quarter of our sleeping time. People have several dreams every night. Dreams are like short films. They are usually in color. Some dreams are like old films. They come to us over and over again. That 2 because the dreamer is worrying about something. Sometimes dreaming is a way of trying to find an answer.
Some people get 3about their work from dreams. They may have been thinking about their work all day. These thoughts can carry into dreams.
Sometimes we4with a good feeling from a dream. But often we can’t remember the dream.Dreams can disappear quickly from memory.
5dreaming can be harmful. The more we sleep, the longer we dream. The mind is hard at work when we dream. That is why we may have a long sleep and still feel tired.
t