University researchers 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 movement of each group was followed by an electric system hidden under the carpet. The experiment showed that those who entered the dark brown room walked more quickly, covered more area, and spent less time in the room than the people in the white environment. Dark brown stimulated（刺激）more activity, but the activity ended sooner.

　　Not only the choice of colors but also the appearance of a room has effect on those inside it. In a second experiment, the researchers prepared subjects with photos of faces. Three groups of subjects were used; each was shown the same photos, but each group was in a different kind of room. One group was in a storeroom. Another group was in a common room—an office. The third group was in a tasteful living room.

　　Results showed that the subjects in the beautiful room appeared to give higher ratings（评价）to the faces than those in the ugly room did.

　　Other studies suggest that students do better at tests taken in comfortable rooms than in ordinary or untidy rooms.

1．An electric system under the carpet was used to discover ________.

       A．what the visitors wanted to do

　　B．the activity of different groups of visitors

　　C．how the visitors entered the different rooms

　　D．whether the visitors walked quickly or not

2．According to the passage, the people who entered the white room walked more ________ than those who were in the dark brown one.

       A．quickly          B．carefully             C．comfortably      D．slowly

3．In the sentence “... but also the appearance of a room has an effect on those inside it,” “those” refers to ________.

　　A．subjects         B．researchers     C．photos             D．different colors

4．The passage gives us ________ facts different rooms give people different effects.

   A．one             B．two              C．three           D．four