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!

    Do you keep a diary（日记） every day? Do you think it is great to remember just what you did on a day many years ago? One way to remember each day is to write about it in a diary. Many people write their diaries every day. They write about what they did, what they ate, whom they saw and met, how they did something and how they felt during that day.

    Most people do not want anyone else to read their diaries. They keep them in a safe （安全的）place. Some Chinese students try to keep diaries in English not only to help themselves to remember something, but also to practice English.

    Long ago, many people wrote diaries, too. People have found some of those old diaries.  Some diaries are useful because we can learn about the life long ago, or we can get to know something important or something interesting.

    There are many famous diaries in the world. Most people in China have read the Diaries of Lei Feng. Lei Feng was a soldier（战士）.In his short life, he did a lot of good things for others and for his country. He was always ready to give, but never asked for anything from people. He kept diaries and from them, people learn what a great man he was. In China's schools,  students learn some of his diaries as texts（课文）.

根据短文内容回答问题：

    This is a story about a famous American woman. Her name is Helen Keller. When she was only nineteen months old, she got an illness. It made her blind(瞎的) and deaf (聋的). She couldn't see or hear anything, so she couldn't learn to speak. When she was six, a young teacher came and taught her to read and write. Her name was Ann Sullivan.

    Later, when she was ten, Miss Sullivan took her to another teacher, Sarah Fuller. Sarah Fuller taught her to speak. Helen put her fingers on Miss Fuller's face and into her mouth. In this way, she learned to speak. She went to school and became famous because she was one of the first blind and deaf persons to learn to speak. She began to write books and to help the blind in many parts of the world. Her hard work and her courage(勇气) made people in all countries love her.

根据短文内容回答问题。

It was a February afternoon. We were in a classroom. Taylor Angler watched some ducks swimming on a farm. But it was all in her head. A virtual reality headset (虚拟现实头戴式显示设备) took her there. "I was surprised to find that the ducks were right in front of me! It was an exciting experience (经历)." Taylor said after taking off the purple headset and finding herself still in the classroom. Many students around the world are taking VR "trips" like Taylor. But what change does it cause in learning? 

Taking children to visit different places is a good way to teach them about the world. But what can children do if they forget it after the trip? VR lets children go back at any time. 

It's difficult to talk about something if you didn't see it with your own eyes in the past. If you didn't see the ocean, with VR, now you can have a look at it for yourself. 

VR can also help students in science classes at school. "Too often at school, when you do experiments (实验), you put different kinds of chemicals together and then get the result. And if you aren't successful, you need to do it again," a high school teacher said. "But we don't have enough chemicals. With VR, I just need to do it again on the computer. I don't have to use chemicals."

VR is useful, but that's not to say we don't need real-world experiences. The real world is what we really need to learn about.