A、Blue. B、Black. C、Green. D、Red. D

Many expressions in English use colors. These expressions show how people feel about the colors. Different colors can describe different feelings of people. For example, people associate red with a strong feeling like anger. When someone is very angry, people say that he or she sees red. Red is an active color. A red-letter day is a lucky day. When criminals are caught in the middle of a crime, people say that they were caught red-handed. Green is the color of grass and leaves. When someone grows plants well, people say he has a green thumb. Blue is a sad, thoughtful color. When someone is very sad, she says she is blue. The blues is a kind of jazz that is usually very sad and slow.