A、In comfortable and beautiful rooms. B、In a messy storeroom. C、In an average office. D、In an ugly room. A

At the University of Kansas art museum, investigators tested the effects of different colored walls on two groups of visitors. For the first group the room was painted white; for the second, dark brown. The experiment showed that those who entered the dark brown room walked more quickly, and spent less time in the room than the people in the white room. Dark brown stimulated more activity, but the activity ended sooner. Not only the colors but also the room appearance influences those inside. Another experiment was carried out, in which three groups of subjects are used; each group was in a different kind of room. One group was in an "ugly" room that looked like a messy storeroom. Another group was in an average room—a nice office. The third group was in a beautiful room with carpeting and drapes. Results showed that the people in the beautiful room tended to give higher ratings than did those in the ugly room. Other studies suggest that students do better on tests taken in comfortable, attractive rooms than in ordinary-looking or ugly rooms.