Green is an important color in nature. It is the color of grass and the leaves on trees. It is the color of most growing plants, too.

Sometimes, the word green means young, fresh and growing. Sometimes, it describes something that is not yet finished or plants that are not ripe.

For example, a greenhorn is someone who has no experience, who is new to a situation. In the fifteenth century, a greenhorn was a young cow or ox whose horns had not yet developed. A century or so later, a greenhorn was a soldier who had not yet had any experience in war (战争) .By the eighteenth century, a greenhorn had the meaning it has today——a person who is new in a job.

About one hundred years ago, greenhorn was a popular expression in the American west Old—timers used it to describe a man who had just arrived from one of the big cities in the east. The greenhorn didn't have the skills that he would need to live in the hard, rough country.

Someone who has the ability to grow plants well is said to have a green thumb. The expression comes from the early nineteen hundred.

A person with a green thumb seems to have a magic touch that makes plants grow quickly and well. You might say that the woman next door has a green thumb if her garden continues to grow long after your plants have died.

The Green Revolution (革命) is the name which was given some years ago to the development of new kinds of rice and other grains. The new plants produced much larger crops. The Green Revolution was the result of hard work by agricultural (农业的) scientists who had green thumbs.

    Beauty sleep is a real thing, researches have shown that people who have enough sleep look more attractive (有魅力的) to others.

    A few bad nights are enough to make a person look especially "more ugly", their sleep experiments show.

    The researchers asked 25 university students to join in their sleep experiment. They were asked to get a good night's sleep for two nights.

    A week later, they were asked to sleep for only four hour every night for two nights in a row. The researchers took make—up free (素颜) photos of the volunteers after both the good and the bad sleep.

    Next, they asked 122 strangers to have a look at the photos and judge (评价) them on attractiveness, health, and sleepiness, as well as asking them: "How much would you like to make friends with this person in the picture?"

    The strangers were good at judging whether the person they were looking at was tired, and if he was sleepy, his attractiveness score would be low.

    The strangers also said they wouldn't want to socialize with the tired students. The researchers say this is natural for people. An unhealthy-looking face makes people run away. In other words, people don't want to hang around with people who might be ill.

    Dr Brewer, an expert at the University of Liverpool said: "Judgment of attractiveness is often unconscious (无意识的), but we all do it, and we are able to judge on even something small like whether someone looks tired or unhealthy. This study is a good reminder of how important sleep is to us."

How to keep on your exercise plan during winter? Here I'll give you some suggestions.

To stay active during the winter, you should first make it as easy as possible to do your exercise. Second, make something different before you {#blank#}1{#/blank#}doing exercise. The following advice will give you some ideas for making winter exercise more comfortable and more enjoyable.

Put your sports clothes in the dryer. If you want to exercise outside, you might keep the clothes in the dryer for a few minutes before that. It's often harder to {#blank#}2{#/blank#}when it's cold outside. {#blank#}3{#/blank#}clothes fresh from the dryer is just one way to get your body warm.

Take a hot shower. If it's really cold outside, you might even try a quick shower to get yourself warm before you do exercise.

Walk indoors. Walking is a good way to {#blank#}4{#/blank#}. To get out of cold weather of winter, you can simply walk indoors, probably in the living area of your room. Walking indoors makes you {#blank#}5{#/blank#}and gives a warm temperature to do it.

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Shandong Province held the 36th Weifang International Kite Festival on the third Saturday of April in2019. A lot of kite fans from all over the world went there to join in the interesting festival on that day. Different kinds of beautiful kites flew in the sky.

Over 2, 000 years ago, a man named Gongshu Ban from Shandong Province invented a kite. It was made of bamboo. In the following centuries, kite-making developed well in China.

The first Weifang International Kite Festival was celebrated in 1984. In 1983, the Chairman of the Seattle Kite Association David Checkley took part in a kite show and later he visited several kite manufacturers(制造商). He found that kites made in Weifang were the best. He suggested holding the first Weifang International Kite Festival there. After that, Weifang began to hold it in April every year.

At the fifth festival, Weifang became known as the" Kite Capital of the World". Today, Weifang is home to over 300 kite factories. People in Weifang sell their products to about 40 countries and regions(地区) , making up 85 %of the domestic(国内的)markets and 65 %of the foreign markets.

However, there are also some problems. "Few people would like to learn about traditional kite-making," said Yang Hongwei. Yang's grandfather was once one of the best kite makers in Weifang. Nowadays, Yang still uses traditional ways and skills to make kites. In her opinion, only traditional things can last for a long time. Since the1990s, she has travelled to many countries to teach and take part in kite shows. "I won't stop teaching the ways of making kites as long as someone wants to learn. Meanwhile, the government should hold more kite festivals in China or even overseas, "she said.

Zhou Dao's grandfather has a hearing problem. During a family party last year, Zhou Dao noticed something. His grandfather sat quietly by himself. The old man was unable to join the talks.

Zhou Dao was sad about this. "Grandpa always reads subtitles (字幕) to watch TV," he thought. "Why can't we put words on our talks?" Then, Zhou Dao began working on that idea. He spent about half a year developing a kind of smart glasses. These smart glasses help users "read" spoken words.

The glasses are connected to a smartphone. There is a microphone on the glasses. It records audio (录制音频) and sends it to the phone. A piece of software turns the audio into words. People can see the words on the glasses.

This allows users with hearing problems to understand others during the talks well. Now Zhou Dao's grandfather can wear the glasses and speak to someone else face to face or over the phone.

Zhou Dao was happy to help his grandfather. Slowly, more and more people in need can wear this kind of glasses.