input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Deserts do not stay the same size .Sometimes they grow bigger. Sometimes they get smaller. The world's biggest desert, Sahara, is in Africa. Right now, the Sahara desert is growing fast. Why is the Sahara growing ? In some places , People farm too much. In other places ,animals eat all the grass. or people cut down the trees. This makes the soil weak. Weak soil lets the desert grow. Why is it a problem? people can not grow food in the desert. people can not build houses, hospitals , or schools in the desert . so people must leave their homes .They must live somewhere else. What can people do ? They can plant trees. They can also farm less. These things make soil stronger. maybe the Sahara will stop growing . It's a big problem. Many people must work together to solve it? Options: A The Sahara Desert is in Africa . B Farming too much makes the soil weak. C Big problem are caused by the growing Sahara desert. D Planting trees will help the world. Answer: D Planting trees will help the world. Question:???
output answer: What is the main idea ?

Write a multi-choice question for the following article, with the given choices and answer: Article: One day an American called Simon went to London to visit his friend, Rick. Rick told him that his flat was on the first floor. When he arrived, Simon went straight to the first floor of the building. But he was told that there was no Rick on that floor. Do you know why? In fact, the British call the first floor of a building the ground floor. The floor above the ground floor is the first floor, while Americans would call it the second floor. The story shows that there are a few culture differences between Britain and America, though the British and Americans both speak English. The British usually hide their feelings. They seldom start a conversation with strangers. For example, on the train the British often spend their time reading newspapers or books. But Americans are quite different. They're more active and easier to talk with. The British and Americans may use different _ for many things. The British usually use "football", "eraser" and "mail" while Americans prefer to use "soccer", "rubber" and "post". Options: A spend his holiday B visit his friend C study English D have a meeting Answer: B visit his friend Question:
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Answer: Simon went to London to _ .

Q: Write a multi-choice question for the following article, with the given choices and answer: Article: The London Eye The London Eye was opened on New Year's Eve in 1999 to celebrate the Millennium . It is 135 meters high, and from the top you can see the whote London. On a clear day you can even see Windsor Castle, which is 40 kilometers away. The London Eye has 32 capsules , each with room for 25 people. Each "trip" lasts 30 minutes. It moves quite slowly, at a speed of about 15 meters a minute, but it never stops. Passengers have to get on when it's moving. OPENING TIME: Daily from 9 a.m. to 10 p.m. in summer and from 10 a.m. to 6 p.m. in winter. TICKETS: Online or by phone. A limited number of tickets are available in the day.From the Ticket Office in County Hall (the building next to the Eye), but go early because you often have to wait in a queue. HOW TO GET THERE: 5 minutes' walk from Waterloo underground station. Choose the best answers: Options: A can usually B can never C can't always D walk from Waterloo underground station to Answer: C can't always Question:
A: People _ get tickets from the Ticket Office because tickets there are limited.

Question: Write a multi-choice question for the following article, with the given choices and answer: Article: Lily has a pen friend in America. Her name is Alice. They write to each other every week. They tell each other about their lives. Here is a letter from Lily. Dear Alice, Thank you for your letter and telling me about your best friend. In this letter, I'm going to tell you about my friend. Her name is Cathy. She has long brown hair and blue eyes. She is the same age as me, but a little taller .She is always happy. We sit together in class and help each other with our homework. We always play together after school and play computer games for an hour. Cathy thinks quickly and does better than me. She is learning to play the piano .I am learning to play the piano, too. We play together every day. It's fun. We always have a good time. Please write to me soon. Love, Lily Options: A She doesn't have one. B Cathy C Alice D Tommy Answer: B Cathy Question:
Answer: Who is Lily's best friend?

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Many children love to play with snow in winter. But Long Chuan has come to hate it. This year his hometown suffered from snowstorms for nearly a month. The heavy snow stopped cars and trains, broke the electricity tower and turned tap water to ice. Every day Long Chuan had to walk several kilometers to carry drinking water. "I couldn't ride a bike and it took me 3 hours to walk to school. I can't remember how many times I slipped on the hard ice, " said Long Chuan. Long is not alone. This year millions of people in central and southern China had a freezing winter without enough water and electricity. The biggest snowstorms in 50 years killed more than 100 people. They also cost the country 111.1 billion yuan. Experts say a special type of climate condition , La Nina, caused the storms. During a La Nina, the water in the Pacific Ocean near the equator becomes colder than usual. It changes the weather around the world. Besides China, Canada, the US and Middle Eastern countries also met with heavy snowstorms this winter. The special climate caused the recent flooding in Australia, too. However, experts say that people have destroyed the environment . Global warming may be causing these terrible weather events to happen more and more often. Options: A China is the only country which suffered from the heavy snow B La Nina is said to have caused the snowstorms C La Nina also caused hot summer in Australia D the snowstorms have nothing to do with global warming Answer: B La Nina is said to have caused the snowstorms Question:
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The answer is:
We can tell from the story that _ .