四、还原信息（2022 抚顺改编）
Yuebai（月白）, qilan（窃蓝）and shuiqing（石青）... 1. It's how ancient Chinese people talked about different kinds of blue — light or deep. Yuebai is not white. It's a kind of blue close to the colour of the moonlight.
Ancient Chinese people divided colours into basic colours and mixed colours. There were five basic colours: blue, red, yellow, white and black. 2. For example, mixing yellow and blue gets green. Thousands of colours came in this way.
Colours have special meanings in Chinese culture. 3. For example, yellow stood for power. And officials of different ranks（级别）wore clothes with different colours. Only officials of the top three ranks could wear purple clothes. 4.
In fact, many beautiful colour names come from famous works. For example, dong fang jibai is a light blue colour. 5. The blue colour describes the colour of the sky before the sun rises. The pink colour taoyao comes from The Book of Poetry（《诗经》）. This colour describes blooming peach trees（盛开的桃树）. Sounds beautiful, right?

五、阅读短文，回答问题（2022 镇江改编）
People use colour expressions to show their feelings and describe the world. Many colour-related phrases are common in our speech. Let's see where they came from.
• The Blues
The phrase is short for "the blue devils", which means sad feelings. It is also used to describe a type of jazz music that became popular in the south of America in the 1940s.
• Black Sheep of the Family
The phrase refers to a member of a family or a group who is unacceptable. In the old days, the black sheep were sold at a lower price than the white ones at the market, because their fleece（羊毛）could not be coloured. This made the black sheep an unwelcome member of the group.
• A Red-letter Day
A Red-letter Day is a day when something really exciting and memorable（难忘的）happens. It came from the practice of marking special Western days, holidays, or other festivals in red on the calendar. Today, some calendars still use red numbers for special holidays.
• Green with Envy
Writers such as Shakespeare in the 16th century used the colour green to stand for envy, but it was the Greeks who connected it with sickness caused by envy. When a person was full of envy, his or her body produced too much bile（胆汁）, giving his or her skin a greenish colour.
1. What kind of music is called the Blues?
2. Why were the black sheep cheaper than the white ones?
3. How may people feel on a Red-letter Day?
4. What did the Greeks connect envy with?
5. Do you know any other phrases about colours? Give an example.