Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Large population has caused many problems. For example, the traffic is very heavy in some big cities. During the last ten years, big cities like Beijing and Harbin were full of cars and buses. Now the streets are completely crowded and it's very difficult to drive a car along them. Drivers must stop at hundreds of traffic lights. What are our cities going to be like in the future? How can we solve the problem? There are some good ideas to reduce the use of private cars. In 1971, the officer in Rome began an interesting experiment: Passengers on the city buses didn't pay for their tickets. In Stockholm there was another experiment: People paid very little for a season ticket to travel on any bus, trolley bus and train all over the city. In many cities now some streets are closed to vehicles and _ are safe there. In London there is another experiment: Part of the streets is for buses only. So the buses can travel fast. There are no cars or taxis in front of them. , . Options: A no traffic is allowed in some streets B traffic is computer-controlled C cars move very slowly D only one-way streets are open to traffic Answer: A no traffic is allowed in some streets Question:
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The answer is:
In many cities, pedestrians are much safer because _ .

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: All schools have their own rules. The rules change from one school to another. Some schools are much stricter than others. There are also some rules that are strange or funny to us. Here are some funny school rules: Strict Japanese rules Most schools ask students to wear uniforms, such as sports suits or skirts. But Japanese schools even have rules about the colour of underwear ! They also require that girls' socks should be folded in a certain way and boys' heads should be shaved . Other Japanese schools tell students that they can't go to the movies after sunset. Different shoes in the USA At some American schools, students have to change their shoes when they go into the schools every day. This makes sure students won't fall over on the floors and keeps the schools clean. No strange hair in the UK Strange hairstyles are not allowed in some British schools. But they might allow students to wear certain hairstyles during the World Cup years. There were two students who had special hairstyles during the 2002 World Cup. After the World Cup, their teachers asked them to go to the barber's at once. Options: A Schools in Japan only. B Schools in the USA and the UK. C Schools in Japan and the UK. D Schools in the UK only. Answer: C Schools in Japan and the UK. Question:
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The answer is:
Which country's schools have rules about students' hair?

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Music is an international language. Popular music in America is what every student likes. Students carry small radios with earphones and listen to music before class, after class, and at lunch. Students with cars buy large speakers and play the music loudly when they drive streets. Adult drivers listen to music on the car radio when they drive to work. They also listen to the News about sports, the weather, politics , and activities of the American people. Most of the radio broadcast is music. Pop or popular music singers make much money. They make a CD or tape which radio stations use in every state . Once the popular singer is heard all over the country, young people buy his or her tape. Some of the money from these tapes comes to the singer. Whenever the singer goes, all the young people want to meet him or her. Now the singer has become a national star. There are other kinds of music that are important to Americans. One is called folk music. It has stories about the common life of Americans. Another is called western or country music. This was started by cowboys who would sing at night to the cows they were watching. Today, any music about country boy and his girl is called western or country music. Serious music for the concert halls is called classical music. Music for instruments is called orchestra music, such as the symphonies of Beethoven. Options: A Their CDs or tapes are used in every state. B Several young people buy their CDs or tapes. C They travel around the world. D They are followed by young people sometimes. Answer: A Their CDs or tapes are used in every state. Question:
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The answer is:
What's one of the reasons that singers become national stars?