【正确答案】 D

【答案解析】[解析]
Blue is the world"s favorite color. It is also the color most often associated with intellect and authority.
Most uniforms are blue. In Greek and Roman mythology, blue is the color of sky gods. In the Old Testament, God is represented by deep blue. Blue is the dominant color in the mosques of the world. Blue symbolizes truth, peace and cooperation. And that"s why it is the color of flag of the United Nations and of Europe.
As in the sky and water that surround us, blue is seen as a peaceful and refreshing color. Blue light has seen to lower blood pressure by calming the nervous system hence relaxing the body and mind. Blue creates large airy spaces. It makes rooms bigger.
Blue bedrooms are restful. Blue bathrooms are appropriately watery. Blue acquires depth with greens and reds. Light and soft blue makes us feel quiet and protected from the bustle and activity of the day. Dark blue represents the night making us calm. Its apparently calming effect makes it the perfect tone for the quieter zones of your living space.
The wrong shade of blue can be uncomfortable. It can also be cold and sterile unless balanced with warmer colors.

[读题] 题干表明，本题是问为什么美国用蓝色作为国旗的主色调。
细节题。文中提到，蓝色象征真理、和平和合作(symbolizes truth，peace and cooperation)，而这也是联合国和欧盟旗帜选用蓝色的原因，故答案为D)。represent≈symbolize。

【正确答案】 C

【答案解析】[解析] 题干表明，本题是问蓝色有什么作用。
细节题。文中提到，蓝色能创造出宽敞通风的环境(Blue creates large airy spaces)，使房间看起来更大，故答案为C)。

【正确答案】 A

【答案解析】[解析] 题干表明，本题是问如果少了暖色调，蓝色会给人留下什么印象。
细节题。短文最后提到，误用蓝色(wrong shade of blue)会令人不适，如果没有暖色的搭配，蓝色甚至会显得冰冷而乏味(cold and sterile)，A)符合原文，故为答案。