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.

    People in different countries speak different languages. But is there a lanuage that can be understood by everyone in the world ? Emojis might be the first truly universal (通用的) language.

    Emojis are a kind of special language. Pictures are used to put meaning across, A group called the Unicode Consortium is in charge of choosing official (官方的) emojis. It has added new emojis every year since 2014. These new emojis do not come out of nowhere. They come from what people think about, like and care about.

    Emojis can be used to represent (代表) different groups of people. In 2015, emoji faces with different skin tones (肤色) were added. In 2016, different jobs were added, such as doctor, police officer and painter along with female versions of these jobs, This year, emojis of disabled people were added, including emojis of blind people and people in wheel chairs.

    But there is also more to emojis. They can also refer to pop culture and new cultural trends. New emojis in 2019 have included several animals, such as sloths (树懒) and flamingos (火烈鸟). These animals are not very common, but are known to many people. For example, sloths have become popular thanks to the 2016 film Zootopia (《疯狂动物城》). Many fashion designers have included flamingos in their designs in recent years. This animal makes people feel like they're on a tropical (热带) vacation.

    It seems that emojis are a mirror of the world we live in. It will be interesting to see how they change and grow in the years to come.

    Here are some ideas for you on how to help others through volunteering.

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    When people get older, it becomes harder to do many things, from walking to the store to doing the housework. Old people living alone can also feel lonely. As a volunteer, you can do a lot to help the old in your neighborhood. You could visit them and help them with their housework.

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    Many people with disabilities need help. You could volunteer to read books to the blind or deliver(递送) something for people who can't get around too well.

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    There are lots of volunteer jobs to do in hospitals and health care centers. As a volunteer, you can make beds, deliver flowers and gifts, help serve meals, and do lots of other important jobs

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    Some families don't have enough money to buy food and c\s For their kids. Some people don't have place to live at all. To help these people as a volunteer, you can give clothes, food or money to, or raise money for a charity.

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    Sometimes people need more help when the holidays come. Holidays are happy, but for people who are alone or unlucky, they can be a lonely, hard time. As a volunteer, you can deliver holiday dinners to less lucky people, visit the lonely old people and serve food to the homeless.

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