Wugang is the political, education, medical health services and cultural center of southwestern Hunan Province. It has a gross area of 1549 square kilometers, with a population of 832,500. The urban area takes 16.52 square kilometers, with 266,000 urban residents.

    This city has a long history and splendid culture. It was a county built in Western Han Dynasty more than 2200 years ago. It has spectacular landscapes, beautiful and natural scenery. Religions are free and prosperous here. Let me show you a few examples, Yunshan mountain (literal means Cloudland Mountain") is not only famous for its vagaries of clouds, but also known as one of the 72 Buddhist Holly Lands in China, Faxiang Carved Stone (A branch of Buddhism which came from Indian), Sun Yat- sen Memorial Hall, Xuanfeng City Gate Tower, Lingyun Tower (Built in 1225). All of these are showing the rich cultural heritage of this ancient yet vibrant city.

    This land is blessed with unsurpassed natural resources. Coal, Manganese, Iron and other 38 kinds of mineral are proved to be highly productive. Especially, Coal reserves account for 70 percent of proved reserves in Southwest Hunan. What's more, the Marinated Food gains great reputation both at home and abroad. Besides, Virus-free orange and corn are also Wugang's local specialties with high-yield and high-quality.

    Welcome to Wugang.

    Mr. Guo is a teacher from Xi'an.  He asked his students to hand in their homework through a QR code(二维码). "We spent an hour or two in class learning how to generate(使产生) the codes, and in the end everything gets easier. "Said Mr. Guo, "When students finish the homework, they keep it on WeChat. Then, each student makes his own QR code and gives it to me. So I can cheek their work anywhere using my computer or telephone. "

    The QR codes can be sent to Mr. Guo by email, QQ and WeChat. When Mr. Guo scans (扫描) his students' QR codes, their homework appears on his phone, lie finds that their homework becomes more creative, with many pictures, music and even videos.

    Mr. Guo's students like the new way and think it is interesting. "We are living in the information age. Many students like to work with computers, which makes learning more fun. "Said Tingling, a student of Mr. Guo's.

    "The paper is not easy to keep, hut the code is easy to keep and share." Mr. Guo said," It is worth trying to use new technology in education. Education itself is a kind of creation. I don't want my students to fall behind the times. "

    However, some parents are worried. They are afraid that their children will spend too much time on computers and less time communicating with teachers. But in fact, it's unnecessary. Students still need to look up information in books and write it down when they do their homework. They only use the codes when they hand in their work, which doesn't take them too much time.  Also for teachers, it allows them to cheek the students' work at any time.  And it's also an easy way to share homework with other students.

    When it comes to the letter grade on your test or homework, you might notice that there is no letter E. Have you ever thought about why that is so?

    In the A. B. C. D and F grading system, the first four letter are typically considered passing grades. An F in this system simply stands for "fail". The word "fail" happens to start with the letter F, which seems to leave out the letter E, The fact of the matter is that any letter can mean "not-passing" or "fail". Some schools have U grade for unsatisfactory", or I grade for "incomplete."

    Even with all this said, we should also point out that E grade actually has been used pretty commonly throughout the history of letter grades in the US.

    The first college in the US to use a letter grading system like the ones we use today is Mount Holyoke College. In 1897, they began to use the following grading scale:

A: 95-100% (excellent)   B: 85-94%(good)   C: 76-84%(fair)

D: 75%(barely passed)   E: below 75%(failed)

    We can see the inclusion of E instead of F.

    Gradually, the letter grading system became more popular throughout the US. However, many schools decided to drop the E grade and go straight to F. There is no evidence(证据)to really support this, but one possible explanation is that teachers were worried that some students and parents might mistake E for "excellent".

    Why do we have letter grades? Well, part of the reason is that they made grading simpler during n time of great change for schools. As the 20th century began, growing cites and an increase in immigration led to larger school classrooms. Most teachers at that time thought this new letter grading system was an easy, fair and clear way to grade students.

    Today, more and more people argue that letter grades don' t fully reflect(反映)student learning. However, as teachers try to improve grading methods, many parents continue to favor the letter grades they got as kids. They are familiar(熟悉) and easy for parents to understand. So while they might not be perfect, the letter grades probably aren't going away any time soon.

    Young children don't have the skills or knowledge to stay safe in heavy traffic. The following tips (忠告) will be helpful for you to keep your children safe in heavy traffic. Children learn about road safety by watching others. As parents, make sure that you always set good examples. Your children will follow you and think it's OK to do like you. Teach your children to pay attention to traffic lights when you cross the road together with them. This helps them understand when it's safe to cross. Make sure that you walk between your children and traffic, and hold their hands all the time.

    When your children are a little older, you can start to tell them the importance of traffic knowledge. Let them start to understand the reasons why they need to be so careful. Talk with them about road signs and traffic rules.

    Ask your children to play in a safe place. Never let them ride bikes on the road without an adult present at rush hours.

    The most important thing you can do is to keep your children from getting hurt, so parents encourage them to follow traffic rules. After knowing about traffic rules, they'll volunteer to obey them. In this way, they'll be careful enough to keep themselves away from danger.

    Here is a famous story about the Great Wall of China. The story happened in the Qin Dynasty.{#blank#}1{#/blank#} Do you want to know more about the love story?

    One day, the emperor, Qin Shi Huang, ordered his soldiers(士兵) to capture(俘虏) some young men. He sent the young men to build the Great Wall of China.

    A young man named Fan Xiliang didn't want to get captured. {#blank#}2{#/blank#}He had nowhere to go and didn't know where to hide. When he heard the soldiers coming towards him, he was terrified.

    At that time, a woman named Lady Meng Jiang was passing by Fan Xiliang. She saw the poor man and saved him. Fan Xiliang said thanks to Lady Meng Jiang.{#blank#}3{#/blank#}Later on they got married.

    Unfortunately, Fan Xiliang was found and captured. He was sent to the Great Wall and worked there.

    Lady Meng Jiang waited for her husband day and night. Winter came, but Fan Xiliang failed to return. {#blank#}4{#/blank#} She took the warm clothes to the Great Wall, but she didn't find Fan Xiliang.

    Someone told her that Fan Xiliang had died and that he was buried in the Great Wall.{#blank#}5{#/blank#}

    She cried so sadly that a part of the Great Wall collapsed(倒塌) and she finally found Fan Xiliang's body.