七、阅读表达。(2025·山东临沂)
阅读短文,回答短文后的五个问题。
The history of traffic lights dates back to the early 19th century in Britain. London was a busy city with horse-drawn carriages(四轮马车). They often rushed into people, causing many accidents. At the same time, there was a fashion rule in London—women in red showed that they were married and green for unmarried. This gave people the idea for using red and green as traffic signs later.
On December 10th, 1868, British mechanic(机械师) De Hart designed the world's first traffic lights with only red and green. A policeman had to pull a belt to change the lights: Red meant "stop", and green meant "go". At first, they worked well and reduced accidents. However, the traffic lights exploded(爆炸) after 23 days.
In 1914, electric traffic lights were first used in America. Red and green still did their jobs, and then they were safer and easier to see.
In 1927, a Chinese student named Hu Ruding was studying in the US. He noticed drivers sometimes rushed when the light was changing. "What if there's a middle colour to slow people down?" he thought. That was how the yellow light was born, meaning "get ready to stop". Around the same time, an American policeman named William Potts created the first three-colour traffic lights for all directions. They made crossroads much safer.
These colours were not chosen by chance. Red is easy to see, like a fire alarm, so it means "Danger—stop!" Yellow is a warning, like a sign that says "Be careful—slow down!" Green, like a forest, tells us "Safe to go!" Together, they form a common language that keeps safe every day.
Great ideas come from everyday things. Whether traffic lights or something else, noticing and thinking "what if" can change the world!
注:每题答案不超过5个单词。
1. When did the world's first traffic lights with only red and green appear?

2. Who suggested adding a yellow light to traffic lights?

3. What does the underlined word "they" refer to in Paragraph 5?

4. What's the title for the passage?

5. According to the writer's opinion, what should we do?