C　sight表示“情景，景象”； look“容貌，外表”；sign“符号，迹象”； appearance“外貌，出现”。只有C项符合语境。

　　Different things usually stand for different feelings. Red, for example, is the color of fire, heat, blood and life. People say red is an exciting and active color. They associate（使发生联系） red with a strong feeling like

　　1

　　. Red is used for signs of

　　2

　　, such as STOP signs and fire engines. Orange is the bright, warm color of

　　3

　　in autumn. People say orange is a

　　4

　　color. They associate orange with happiness. Yellow is the color of __5__. People say it is a cheerful color. They associate yellow too, with happiness. Green is the cool color of grass in __6__. People say it is a refreshing color. In general, people __7__ two groups of colors: warm colors and cool colors. The warm colors are red, orange and __8__. Where there are warm color and a lot of light, people usually want to be __9__. Those who like to be with __10 _ like red. The cool colors are __11_

　　and blue. Where are these colors, people are usually worried. Some scientists say that time seems to __12 _ more slowly in a room with warm colors. They suggest that a warm color is a good __13_

　　for a living room or a __14_ . People who are having a rest or are eating do not want time to pass quickly. __15

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