【山东省青岛市2015年中考英语试题】阅读下面短文，按要求完成各项任务。（共8分）
Where is the true home of hamburger?
The kind of beef we see in hamburgers , minced(切碎)beef, was possibly invented by Mongolians over 800 years ago. But who first put the beef between pieces of bread and called it a hamburger? Three different cities in the United States all say that they were the first to invent America’s favorite food.
Some people say that Fletcher Davis, from Athens, invented hamburgers. “Old Dave,” as people called him, was selling minced beef sandwiches in his lunch bar as early as the 1880s. Some years later, they say that a group of Germans called①his sandwich a “hamburger” because people from the German city of Hamburger ate this kind of beef.
Other people believe that the hamburger came from a different American city.②coincidentally, its name was also Hamburg. The Menches brothers were selling pork sandwiches at a fair in 1885, but when there was no more pork, they used minced beef and gave it a new name, the “hamburger”.
The third possible inventor of the hamburger was Charlie Nagreen, also known as “Hamburger Charlie,” from Seymour. He said that in 1885 he invented the world’s first hamburgers. Seymour now celebrates the invention of the hamburger every year. In 1989, it was the home of the world’s largest ever burger—over 2,500kg!
任务一请根据短文内容，完成句子。每空一词。
1. There are three American cities in this passage. They are Athens,            And             .
2. When there was no more         at the1885 fair, the Menches brothers used minced beef         .
任务二请根据短文内容，用英语表达 ①处划线单词his 所指代的内容。
任务三请根据短文内容，猜测②处划线单词coincidentally 的中文意思。 将其字母代号填写在答题卡上。
                    A 幸运地   B 碰巧地   C 相反地
任务四请根据短文内容， 回答问题。
How often is the invention the hamburger celebrated in Seymour?                          .
任务五请从文中找出与Mongolians possibly invented minced beef a long time ago. 意思相近的句子。
                         .
任务六请用英语简要概括出本文的主旨大意，不超过10个词。
It ‘s mainly about                                                                .