TASK DEFINITION: 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.
PROBLEM: Article: The English language is the result of the invasion of the island of Britain over many hundreds of years.The first invasions were by a people called Angles about 1, 500 years ago. The Angles were a German tribe who crossed the English Channel . Later two more groups crossed to Britain. They were the Saxons and the Jutes. Through many years, the Saxons, Angles and the Jutes mixed their different languages. The result is what is called Anglo-Saxon or old English. The next great invasion of Britain was done by Vikings about 1, 100 years ago. Many English words used today come from these ancient Vikings. The next invasion of Britain took place more than 900 years ago, in 1066. History experts call this invasion the Norman Conquest. The Normans were a French-speaking people from Normandy in the north of France. These new rulers spoke only French for several hundred years. It was the most important language in the world at that time. It was the language of educated people. But the common people of Britain still spoke old English. Old English took many words from the Norman French. Some of these include "damage", "prison", and "marriage". The French language used by the Norman rulers greatly changed the way English was spoken 800 years ago. English became what language experts call Middle English. Middle English sounds like Modern English. But it is difficult to understand now. The history of the English language continues as Middle English becomes Modern English, which is spoken today.
Answer: The Angles.

SOLUTION: Who was the first invaders of Britain?

PROBLEM: Article: I went through a training program and became a literacy volunteer last surnmen The training I received, though excellent, did not tell me how it was to work with a real student, however. When I began to discover what other people's lives were like because they could not read, I realized the true importance of reading. My first student Marie was a 44-year-old single mother of three. In the first lesson, I found out she walked two miles to the nearest supermarket twice a week because she didn't know which bus to take. When I told her I would get her a bus schedule, she told me it would not help because she could not read it. She said she also had difficulty once she got to the supermarket,because she couldn't always remember what she needed. Since she did not know words, she could not write out a shopping list. Also, she could only recognize items by sight, so if the product had a different label, she would not recognize it as the product she wanted. As we worked together, learning how to read built Marie's self-confidence,which encouraged her to continue her studies. She began to make rapid progress and was even able to take the bus to the supermarketelt. After this successful trip, she reported how self-confident she felt. At the end of the program, she began helping her youngest son,Tony, a shy first grader with his reading. She sat with him before he went to sleep and together they would read bedtime stories. When his eyes became wide with excitement as she read, pride was written all over her face. As she described this experience, I was proud of myself as well. I found that helping Marie to build her self-confidence was more rewarding than anything I had ever done before. As a literacy volunteer, I learned a great deal about teaching and helping others. In fact, I may have learned more from the experience than Marie did.
Answer: She helped someone to learn to read

SOLUTION: What did the author do last summer?

PROBLEM: Article: CHINA established the city of Sansha yesterday on Yongxing Island in the southernmost province of Hainan. A ceremony to mark the city's establishment began at 10:40 am on a square in front of the city government's main building. The national flag was hoisted and the national anthem played after the unveiling of the signboards of the Sansha Municipal Government and the Sansha Municipal Committee of the Communist Party of China(CPC). Official broadcaster China Central Television(CCTV) aired the ceremony live, with speeches from Sansha's newly appointed mayor and other officials. Sun Shaochi, vice minister of civil affairs, announced the State Council's approval of the establishment of the city at the ceremony. Luo Baoming, Party chief of Hainan Province, said in a keynote speech that Sansha was established to administer the Xisha, Zhongsha and Nansha islands and their surrounding waters in the South China Sea. "The provincial government will be devoted to turning the city into an important base to safeguard China's sovereignty and serve marine resource development." he said. He said the main task now will be to build up political power in Sansha to ensure efficient management. The Sansha city government is located on Yongxing Island, a part of the Xisha Islands and the largest island in the area. Sansha is 13 hours from the mainland by boat. It has a post office, bank, supermarket and hospital, but little else.
Answer: On Yongxing Island.

SOLUTION:
Where is the center of Sansha city located?