input question: Write a multi-choice question for the following article, with the given choices and answer: Article: In the 13th century , the famous Italian traveller, Marco Polo, travelled a long way to China.During his stay in China, he saw many wonderful things. One of the things he discovered was that the Chinese used paper money. In western countries, people did not use paper money until the 15th century. However, people in China began to use paper money in the 7th century . A Chinese man called Cai Lun invented paper almost 2,000 years ago. He made it from wood. He took the wood from trees and made it into paper. He then put these pieces of paper together and made them into a book. Now paper still comes from trees. We use a lot of paper every day. If we keep on wasting so much paper, there will not be any trees left on the earth. If there are no trees, there will be no paper. Every day, people throw away about 2,800 tons of paper in our city. It takes 17 trees to make one ton of paper.This means that we are cutting nearly 48,000 trees every day. Since it takes more than 10 years for a tree to grow, we must start using less paper now. If we don't, we will not have enough time to grow more trees to take the place of those we use for paper. So how can we save paper? We can use both sides of every piece of paper, especially when we are making notes. We can choose drinks in bottles instead of those in paper packets. We can also use cotton handkerchiefs and not paper ones. When we go shopping, we can use fewer paper bags. If the shop assistant gives us a paper bag, we can save it and reuse it later. Everyone can help to save paper. If we all think carefully, we can help protect trees. But we should do it now , before it is too late. Options: A Saving Paper B The History of Paper C Cotton Handkerchiefs Back Again D Cai Lun, the Great Inventor Answer: A Saving Paper Question:???
output answer: Which is the best title of the passage?

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Get a Life is a website that helps middle school students answer the question --What do you want to be when you grow up? "It encourages teenagers to have a big dream; it tries to find out what is possible; it makes a plan for children to get where they want to go," said Combs, one of the persons who set up the website. [:ZSSxxSSk.Com] Get a Life suggests teenagers let their hobbies and interests decide what to do in the future. It encourages them to look for activities that help them try to do some jobs and get important knowledge and skills. It also offers information about fast-growing and well-paid jobs, and provides job training for teenagers. "Middle school is the perfect time for students to find out their interests, to have many different experiences and do something for their future jobs," a middle school teacher said. "Our world will become a better place if we make our _ s wide and try new things. Our students can't wait until high school or university to begin building their dreams. Right now is the right time to get a life." "This website is exactly what these children need for a better future. If our children can make better plans for their future, it is more possible for them to succeed," Combs said. Options: A boring B helpful C colorful D serious Answer: B helpful Question:???
output answer: According to the passage, the website is _ for children.

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Do you know why different animals or pests have their special colors? Colors in them seem to be mainly used to protect themselves. Some birds like eating locusts , but birds cannot easily catch them. Why? It is because locusts change their colors with the change of the colors of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change into the same brown color as crops have. Some other pests whose colors are different form plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night. If you study the animals' life, you'll find the main use of colors is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters because their colors are much like the trees. Colors are useful not only on the land, but also in the sea. A kind of fish in the sea can give out a kind of black liquid when the fish face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is why they live safely though they are not strong at all. Options: A The colors of the seasons B Animals on the land and in the sea C The main use of colors for animals and pests D How to keep safe in the sea Answer: C The main use of colors for animals and pests Question:???
output answer: Which is the best title for this passage?

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: London used to be "foggy" for the same reason that cities like Beijing' or Chongqing are "foggy~ today. The "fog was in fact smog, a mixture of smoke and fog. In other words, it was made by air pollution In London, some of this pollution came from factories, but much of it came from the coal that people burnt in their houses to keep warm during the winter. By the 1950s, London's smog problem had become so bad that the-government decided to do something to clean the air. A new law was made and nobody could bum coal in any British city. Within a few years, the air became much cleaner. There were no more " _ ". . Many Chinese cities now face the same sort of' problem with air pollution that . London faced 40 0r 50 years ago. However, this problem is more difficult for Chinese cities to solve One reason is that more of the pollution comes from the factories, rather than from coal burnt in people's houses If these factories were closed, this would harm the economy and lots of people would lose their jobs. Another reason is that changing from coal to cleaner fuel , like gas, is quite expensive. However, the air in many Chinese cities is becoming cleaner and cleaner, as the government and people pay more and more attention to cutting down pollution . As a result,there are fewer "pea-soupers" in Beijing than there used to be. . Options: A Many factories in the city were closed B There was not so much fog in the winter later. C People paid more attention to cleaning their city. D A law was made to keep people from burning coal in their houses. Answer: D A law was made to keep people from burning coal in their houses. Question:???
output answer:
How did the air in London become much cleaner?