input question: Write a multi-choice question for the following article, with the given choices and answer: Article: A good joke can be the hardest thing to understand when studying a foreign language. As a recent article in The Guardian newspaper noted, "There's more to understanding a joke in a foreign language than understanding vocabulary and grammar." Being able to understand local jokes is often seen as an incredible ice-breaker for a language learner eager to form friendships with native speakers. "I always felt that humor was a ceiling that I could never break through," Hannah Ashley, a public relations account manager in London, who once studied Spanish in Madrid. Told The Guardian, "I could never speak to people on the same level as I would speak to a native English speaker. I almost came across as quite a boring person because all I could talk about was facts." In fact, most of the time, jokes are only funny for people who share a cultural background or understand humor in the same way. Chinese-American comedian Joe Wong found this out first-hand. He had achieved huge success in the US, but when he returned to China in 2008 for his first live show in Beijing, he discovered that people didn't think his. Chinese jokes were as funny as his English ones. In Australia, meanwhile many foreigners find understanding jokes about sports to be the biggest headache. "The hardest jokes are related to rugby because I know nothing about rugby," said Melody Cao, who was once a student in Australia. "When I heard jokes I didn't get, I just laughed along." In the other two major English-speaking countries, the sense of humor is also different. British comedian Simon Pegg believes that while Britons use irony-basically, saying something they don't mean to make a joke-every day, people in the US don't see the point of using it so often. "British jokes tend to be more subtle and dark, while American jokes are more obvious with their meanings, a bit like Americans themselves," he wrote in The Guardian. Options: A making jokes can help you make friends with native speakers B local jokes can help you to understand the local culture better. C understanding jokes requires a good knowledge of vocabulary and grammar. D to understand its jokes, you'd better lean the culture. Answer: D to understand its jokes, you'd better lean the culture. Question:???
output answer: The writer quoted the sentence, "There's more to understanding a joke in a foreign language than under standing vocabulary and grammar." to show that _ .

Write a multi-choice question for the following article, with the given choices and answer: Article: The year is 2094. It has been announced that a comet is heading towards the earth. Most of it will miss our planet, but two pieces will probably hit the southern half of the earth. On 17 July, a piece of 4 kilometers wide comet enters the Earth's atmosphere with a massive explosion . About half of the piece is destroyed, but the remaining part hits the South Atlantic at 200 times the speed of sound. The sea boils and a huge hole is made in the seabed. Huge waves are created and spread outwards form the hole. The wall of water, a kilometer high, rushes towards southern Africa at 800 kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned . Before the waves reach South America, the second piece of the comet lands in Argentina. Earthquakes and volcanoes ash set off in the Andes Mountains. The shock waves move north into California and all around the Pacific Ocean. The cities of Los Angeles, San Francisco and Tokyo are completely destroyed by earthquakes. Millions of people in the southern half of the earth are already dead, but the north won't escape for long. Because of the explosions, the sun is hidden by clouds of dust, temperatures around the world fall to almost zero. Crops are ruined. The sun won't be seen again for many years. Wars break out as countries fight for food. A year later, no more than 10 million people remain alive. Could it really happen? In fact, it has already happened more than once in the history of the earth. The dinosaurs were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a piece of object in space. The dinosaurs couldn't live through the cold climate that followed and they died out. Will we meet the same end? Options: A Because the land is covered with water. B Because the light and heat form the sun cannot reach the earth. C Because people there cannot live at the temperature of zero. D Because wars break out among countries. Answer: B Because the light and heat form the sun cannot reach the earth. Question:
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Answer: Why can't the northern half of the earth escape for long?

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Once again, rumors are spreading. Judgment Day, this time, is set to happen on December 21st, 2012. The date originated from the Mayan calendar, but actually gained popularity through the hit movie, "2012". How will the world end? And how do we know the exact date? There are many theories: A meteoroid from outer space; a solar storm; a shift in the earth's poles; bla bla bla. They all supposedly pointed to the date of December 21st, 2012. Unfortunately, none of it is true. Zhu Jin, director of Beijing Planetarium, said, "For earth itself, the end will be billions of years away from now.And for us humans, there is a very small chance that we may be affected by some astronomical factors.However, we don't have the ability to foresee such events so far.So when someone tells you the world is going to end on an exact date, it must be fake." But the truth hasn't stopped people from believing. In the sci-fi movie "2012", the director imagined the end of the world based on the Mayan calendar. The film earned nearly 770 million US dollars worldwide. Ning Hong, Hebei Province, said. "The movie 2012 did get one thing right. There are arks being made in China, But they're not being built secretly inside the mountains.They are constructed here in the courtyard of a factory." In April, Liu Qiyuan quit his furniture business and devoted himself to developing these huge round balls. He doesn't believe the end is near, but he wants to be prepared just in case. Liu Qiyuan, the "Ark" builder, said, "The concept originated twenty years ago. The Tangshan earthquake had flattened our house, so I wanted to build a shelter that wouldn't fall. Then in 2004, I saw the tsunami in Indonesia that killed so many people.Then I realized it should be something that could withstand the earthquake and float on water." Liu is hoping to use his invention as a life boat on the sea.He's planning to test his product on the water next year. It turns out that rumor, though false, is good for business. Doomsday discounts and products are hot on... Options: A he wanted to make preparations for destructive natural disasters B he was tired of making money from his furniture business C he was almost killed in Indonesia in 2004 D he believed that the world was going to end on Dec. 21, 2012 Answer: A he wanted to make preparations for destructive natural disasters Question:
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The answer is:
Liu Qiyuan quit his job and built his "ark" because _ .