input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Uncle Li and Uncle Wang are good friends. They live next to each other and their farms are both at the foot of the mountain. So they can help each other. But neither of them likes to use his head. They work hard but they are both poor. Most villagers have built new houses, but they still live in the low and broken houses. They never find out why. Once Uncle Li went to town to buy some medicine for his wife. In the town he heard the apples in a city were expensive. He told Uncle Wang about it as soon as he went back. They decided to carry some apples to the city. They borrowed some money from their friends and bought nearly 1,000 kilograms of apples in the villages and carried them to the city on a tractor . Bad luck! A lot of apples were in the city when they arrived. A few days later they had to sell them at a low price. They felt unhappy and returned to their village. "I can't understand why we sustained losses in business while others always profit " Uncle Li asked one day. "The tractor was too small" Uncle Wang said without thinking. "We'll carry more apples on a truck next time!" "I agree!" said Uncle Li. "How foolish we were!" Options: A theirs weren't as good as the others' B theirs were much less than the others' C a lot of apples were in the city D they forgot to carry them on a truck Answer: C a lot of apples were in the city Question:???
output answer: The two farmers had to sell their apples at a low price because _ .

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: There are 45 students in our class. I have made a survey, 36 students say they like to exercise. Most boys play basketball together twice a week. But girls think basketball is difficult for them, they'd like to play volleyball together twice a week. My friend, Tony, is good at running. He runs fastest in our class. He runs for 30 minutes on the playground every evening before he goes to bed. Is it interesting? Gray is good at swimming. He goes to the swimming club three times a month in winter, and three times a week in summer. So he is pretty healthy. Some of my classmates have good eating habits. They eat both meat and vegetables. 70% of them drink milk every day. 15 students say they drink milk three or four times a week. But some students like to eat junk food, especially Sally. What's worse is that she doesn't like to exercise, so she is very fat. She always says " I'm going to lose weight tomorrow." Options: A Threetimesamonth. B Threetimesaweek. C Itisn'tmentionedinthepassage D Hardlyever Answer: A Threetimesamonth. Question:???
output answer: How often does Gray swim in winter?

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: Tornadoes are one of the worst weather events on earth. Each year, tornadoes kill many people. The storms often carry homes, cars and trees from one place to another. And they can also _ anything when they pass by. A tornado comes from a thunderstorm in the sky down to the ground. It is big at the top and small at the bottom. A tornado appears when winds in different directions meet in the cloud and begin to turn in circles. People can see tornadoes almost everywhere in the world. But most happen from late winter to middle summer. There is a second high season in November. During spring, warm air moves north and mixes with the cold air left from winter. In November, the opposite happens. Cold air moves south and mixes with the warm air left from summer. Tornadoes always come suddenly. Weather scientists have done something to predict tornadoes. But the storms often move too fast for people to protect themselves. Last year, tornadoes killed more than one hundred people in United States. Scientists say the best place to be in is a small room, without windows, in the middle the lowest part of a building when tornadoes come. ,. Options: A from late summer to middle summer B from late autumn to middle winter C from late autumn to middle spring D from late winter to middle summer Answer: D from late winter to middle summer Question:???
output answer: In the United States, most tornadoes happen _ .

input question: Write a multi-choice question for the following article, with the given choices and answer: Article: My name is Lisa. Because of my job, I often went to the United States. I often felt worried during my trip because I didn't speak English well. So I decided to learn English. I went to Mrs Brown's English class. Before I came to the class, I always walked away when I met any Americans. But now I try to talk to Americans in English. And I like going to supermarkets, cafes and restaurants to talk with local people. I learn English in four ways. First , I listen to the teacher carefully and keep speaking in class. Second, I do my homework after I get home. I learn at least five words every day. Third, I listen to American radio and watch American TV programs. Finally, I surf the Internet to talk with different people in English. To learn English well, I think you must learn to open your mouth. For me that is the key to opening the door of learning English. Options: A Listening to American radio and watch American TV. B Learning to talk to Americans in English. C Listening carefully in class. D Learning at least five words every day. Answer: B Learning to talk to Americans in English. Question:???
output answer:
What's the key to opening the door of studying English for Lisa?