【推荐2】Everybody enjoys acts of kindness. But can you explain why? Some people think kindness is something out of love and care, while others believe it is just a tool that we use to become more popular. But research shows that being kind can be good for an area of the brain called Striatum. Research also shows that kindness improves people’s mood (情绪). But why and how does it happen? Here are a number of different ways.

Being kind can make someone smile. If you see yourself smile in a public place, people around may be smiling, too. This is specially true for your close friends and family. A kind act makes someone who is sad feel better. It can also make ourselves feel good.

Secondly, being kind develops a good start with others. Kind acts like buying someone a present make friendships stronger. Research has shown that spending money on others may help you get a stronger feeling of happiness than spending it on yourself.

Thirdly, being kind also lifts everyone’s mind. In another recent research, even children in their first year of secondary school know how being kind makes them feel happy. If one person is kind, he or she makes others in the group kind. Imagine that you make cakes for the office and it makes others do it each month. Then you’re getting a lot more cakes.

Finally, being kind may improve your mood. Many researches have also shown that if you’re in a good mood, you can act much more kindly. This makes it a wonderful two-way relationship, doesn’t it? So the story doesn’t end here.

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【推荐3】Dolphins(海豚) are one of the cleverest animals in the world. We may hear of many stories about how dolphins save people out of water.

Dolphins often eat fish and some other sea animals. A dolphin with a weight of 200kg to 250kg will eat 10kg to 25kg of fish every day. They like to swim with other dolphins and usually hunt(捕猎) in groups.

Dolphins have very good hearing. They use it to find things under the water. Many scientists also believe dolphins can even talk to each other through a special whistle(哨声). People from different areas(地方) don’t speak the same language. Just like people, dolphins’ whistles have many kinds. One day we may understand dolphins’ whistles, and then they will be able to tell us about themselves.

Dolphins live in the sea, but they are not a kind of fish and they don’t lay eggs. They have babies in the same way as cows and cats do, and give their babies milk. A female dolphin has a baby every two to three years.

Dolphins are very friendly. Sadly, there are not many kinds of dolphins left. People killed them for many years for food and other things. Now it’s time to stop this and perhaps there will be more of them in the years to come.

【推荐2】Long ago, as people got older, there was something wrong with their teeth and they would have a toothache.     1    

Later people learned that cleaning their teeth was important, but they didn’t have toothpaste (牙膏）at that time.     2    

About 100 years ago someone finally invented a kind of cream to clean teeth. Not long after that, the toothpaste tube (管子) was invented, so people could press the toothpaste right onto the toothbrush!     3    The army gave toothbrushes and toothpaste to all the soldiers, and they learned to brush teeth twice a day. At that time toothpaste tubes were made of metal (金属 ).     4    

Today there are plenty of toothpaste choices: lots of colors and tastes to choose from, and some kinds of toothpaste are made just for children. When you are choosing a kind of toothpaste, make sure it has fluoride ( 氟化物).     5    When you brush your teeth, you don’t need a lot of toothpaste: just press out a bit.

Teeth are a very important part of our body. We will lose them forever once they are broken. So we must protect them.

While the start of a new school year is always exciting, this year was even more for some primary school students in Auckland, New Zealand. They became the world’s first kids to be “taught” by a digital (数码的) teacher. Before you start imagining a human-like robot walking around the classroom, Will just appears on the computer or smart phone screen.

Will has a look of a man in the 30s and he acts just like a human. The digital teacher now teaches “Be sustainable (可持续的) with energy”, a free programme for Auckland primary schools. This programme used to be taught by humans. Its purpose is to educate kids about energy use and the different forms of renewable energy. Just like the human teachers, Will can not only answer the kids’ questions, but also react (回应) to their facial expressions. For example, if a student smiles at Will, he will smile back.

The inventor of Will says using a digital human like Will is a great way to send new information to people.

Will has been a great success. He easily captures (吸引) students’ attention and the kids love him. However, no matter how popular Will becomes, he will be unlikely to replace human teachers. For one, Will won’t have as much knowledge as human teachers. And more importantly, there are always unexpected situations in class, and even the smartest digital human won’t know how to deal with them. However, the digital teacher could come in handy as a private teacher, providing kids with one-to-one help on some subjects or topics.

【推荐1】As Chinese, we feel very lucky. These years, China is getting better and better. Let’s see some numbers about Chinese achievements.

98%: In China, all schools in the country have the Internet. About 98% of the students can have classes in multimedia classrooms.

170: May 10th is China Brand (品牌) Day. Chinese brands are very popular in our country and other countries. Huawei, for example, is a top telecoms equipment maker. About 170 countries Huawei’s telecoms equipment.

160,000: China has the world’s largest expressway network (高速公路网). It’s about 160,000 kilometers long in all at the end of 2020.

13,700,000,000: China’s “Sky Eye”, the world’s largest single-aperture radio telescope(单孔射电望远镜), opened to the world on March 31st, 2021. It can see things about 13.7 billion light years away.

These are a small part of China. Come on, China!

【推荐2】AI (人工智能) makes our lives easier and better. Let’s see the amazing AI.

What will our life be like in the future? Find out about technological developments in our lifetime — and beyond.

    1    

You won’t need one. You’ll go to your Personal Station and you will type your destination on a special computer. A door will open and a small taxi will take you to your stop.

    2    

Very large round roofs will protect all cities on the earth. In this way, we will enjoy the sun all year round and there won’t be any pollution.

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You will just think an order and robots or other machines will carry it out. Computers will recognize your voice and your thoughts. For example, you will think “Sit” and your robotic dog will sit next to you at once.

    4    

In some years, you won’t need to go to the theatre, to a concert or to a football match. You’ll watch any event live on your virtual reality screen and you won’t miss a thing. You will feel you are in a crowded stadium, dancing to the rhythm of the latest hit. At the same time, your parents won’t worry about their children’s safety.

    5    

It is a pair of glasses with a battery hidden inside the frame. It can perform many of the same tasks as smart phones. It has a hidden camera and a tiny screen. It is designed to take hands-free photos or videos of anything people are doing.

【推荐1】Do you often feel tired? Do you sometimes feel uncomfortable on your neck and back? It may because of the radiation（辐射）from your computer. If you spend three hours or more in front of a computer, you may feel terrible because of the radiation.

The safe amount of radiation is 25V/m. Do you know how much radiation our computers give off?

Keyboard: 1, 000 V/m              Mouse: 450 V/m

Monitor: 218V/m              CPU: 170 V/m

Laptops: 2, 500 V/m

Ways to protect yourself from harmful computer radiation:

①Put some green plants on your desk. They can take in radiation.

②Drink two to three cups of green tea a day and eat an orange daily. They keep us healthy.

③Use a screen filter（屏幕过滤器）for your monitor.

④Avoid having metal（金属的）objects near your desk.

⑤Put the back of the computer to the wall. Most of the radiation comes from the back.

⑥Keep your monitor at least 50 cm away from your face.

⑦Allow fresh air to move around your computer room.

⑧Eat healthily especially fruit and vegetables.

⑨Turn off your computer if you have to rest nearby.

【推荐3】Hello, everyone! I’m Jim Smith. I’d like to talk about my birthday and birthday party. When is your birthday? You have your birthday every year, right? But I don’t have my birthday every year. I have it every four years. Why? Yes, it’s on February 29th. My last birthday was in 2018. And this year, there isn’t a birthday for me! But I have a birthday party every year. If (如果) there is no 29th of February, my birthday party is always on February 28th in a park. And I get nice gifts, like books, CDs or nice clothes.

My thirteenth birthday party is coming. It’s next Friday. I hope I will get a new watch.