In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

[EX Q]: Article: In white shirt, blue pants, black cloth shoes and two pigtails, Jingqiu gives off an air of great "pure beauty" in Zhang Yimou's new movieUnder the Hawthorn Tree, which tells the story of the sad romance of Jingqiu and a handsome young man named Laosan set at the end of the "cultural revolution" (1966-- 1976). Before it was released, moviegoers foresaw what this "pure beauty" could be. Director Zhang complained of how long it had taken him to find the right girl for the part of Jingqiu -- a character so innocent. She believes that simply lying on the same bed as a man will make her pregnant. It was 18-year-old Zhou Dongyu who stood out from the crowd. According to Zhang, Zhou has "eyes that are clear like a fountain on a mountainside". Born to an ordinary worker's family, the Shijiazhuang girl was in her final year of high school and working hard for a place in an art college. "If you have fair skin and clear eyes, as Jingqiu does, it is easy to look pure. Girls today wear so many jewels and make-up--that's the reason Zhang was not interested," said Du Yanlai, 17, of Chengdu. While some teenagers consider such "pure" beauty _ , others believe that it speaks of something soulful. Purity is all about an innocence that shines through from within, thinks 16-year-old Tan Mengxi of Nanjing. "Being pure can be simple, not having complicated thoughts and being inexperienced. However, it doesn't mean an ignorant or native person. So, a person is pure in his or her nature if he or she is always enthusiastic and able to deal with difficult matters independently. This purity doesn't pass with time, "she said.
Answer: Being simple, enthusiastic and able to manage things alone.
[EX A]: What's the real purity according to Tan Mengxi?

[EX Q]: Article: As many people hit middle age, they often start to notice that their memory and mental attention are not what they used to be. We suddenly can't remember where we put the keys just a moment ago, or an old friend's name, or the name of an old band we used to love. It happens to most of us, but is it unavoidable? Scientists are increasingly showing that there's actually a lot that can be done. It turns that the brain needs exercise in much the same way as our muscles do, and the right mental workouts can improve our basic cognitive functions. Now, a new San Francisco Web-based company has taken it a step further and developed the first "brain training program" designed to actually help people improve and regain their mental sharpness. Called Lumosity, it was designed by some of the leading experts from Stanford University. Lumosity is far more than an online place to exercise your mental skills. That's because they have combined these exercises with a Web-based program that allows you to systematically improve your memory and attention skills. Apparently it works. One study showed students improved their scores on math tests by 34 percent after using Lumosity for six weeks, greater gains than those made by other students in the same class, who were not training with the Lumosity program. The company says its users have reported clearer and quicker thinking, improved memory for names, numbers, directions, increased alertness and awareness, high mood, and better concentration at work or while driving.
Answer: To improve students' scores on test.
[EX A]: What is the purpose of Lumosity?

[EX Q]: Article: One Tuesday, we got up, had breakfast and got ready for school. We picked up our school bags and went to school. I opened my school bag to get my homework after I went into the classroom and sat down. My school homework needed to be handed in. But it was not there! I remembered I had put it in my school bag. I thought back to Monday afternoon. I finished my school homework, put it in my school bag, and went out to play softball with the neighbor kids. My sister Sara was not out playing as usual. She read a book inside the house. She must have taken my homework while I was playing softball outside as no kids came inside our house on Monday. After school I ran to the place where my sister and I usually meet. There was Sara. She didn't seem to be laughing at me. She is good at giving false information. "Sara, what have you done with my homework?" I asked. She said she hadn't seen it! "What should I do?" I thought. I waited for a chance to talk to Mom. In Mom ' s room, I cried and shouted: I couldn't help shaking. I told her about my missing school homework. Hearing this, Mom left the room, went into the kitchen hurriedly and started looking in the trash. She pulled my school homework out of the trash! Mom said, "I' m sorry, Teri. I saw that your school bag was too heavy, so I cleaned it out for you. Your homework didn't look any different from the waste paper which I threw away." I realized that I had misunderstood my sister. I apologized to her. And I learnt a good lesson from this experience.
Answer: Because her sister was in the house while she was out.
[EX A]:
Why did the writer think it was her sister who had taken her homework?