18.听第二篇短文,回答第16至20小题. 16.What may be important than sleep according to the passage? A.Work. B.Dreams. C.Food. 17.What do people do during their sleep? A.They dream. B.They talk. C.They laugh. 18.Why do some people often dream about their work? A.Because they are tired in the daytime. B.Because they don't like their work. C.Because maybe they are thinking about their work all day. 19.What's the passage about? A.What is a dream? B.People like dreams. C.Dreams are like films. 20.What can we get from the passage? A.Dreams are like long films. B.We can always remember dreams. C.Dreaming too much can be bad.