Do you know why different animals or pests have their special colours? Colours in them seem to be used mainly to protect themselves. Some birds love eating locusts (蝗虫), but birds cannot easily catch them, why? It is because locusts change their colours with the change of the colours of crops. When crops are green, locusts look green. But as the harvest (收获) time comes, locusts change to the same brown colour as crops have. Some other pests with different colours from plants are easily found and eaten by others. So they have to hide themselves for living and appear only at night.

    If you study animals' life, you'll find the main use of colour is to protect themselves. Bears, lions and other animals move quietly through the forests and they cannot be easily seen by hunters. This is because they have the colours much like the trees.

    Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid (液体) when it faces danger. While the liquid spreads, its enemies cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

    Most teens need more than 9 hours of sleep each night. But about 1 in 4 teens has trouble in sleeping. Lack of sleep can affect everything from our feelings to how well we focus on tasks like studying. It can also influence sports performance, increase our chances of getting sick, and may lead to weight gain in some people.

    How can we get the sleep we need? Here are some ideas:

    Be active during the day. Get at least 60 minutes of exercise a day. Physical activity can decrease stress and help people feel more relaxed. Just don't work too close to bedtime because exercise can wake you up before it slows you down.

    Say goodnight to electronics. Experts suggest using the bedroom for sleep only. At least shut everything down an hour or more before lights out.

    Keep a sleep routine. Going to bed at the same time every night helps the body expect sleep. Creating a bedtime routine can improve this relaxation effect. Reading, listening to music, spending time with a pet, writing a diary or doing anything else can relax you.

    Expect a good night's sleep. Instead of worrying that you won't sleep, remind yourself that you can. Say "Tonight, I will sleep well." several times during the day. It can also help to practise breathing exercises or gentle exercises before bed.

    Everyone has a sleepless night once in a while. But if you regularly have trouble in sleeping and you think it's affecting your mood or performance, talk to your doctor.

    Americans think much about time. From childhood they learn to {#blank#}1{#/blank#} time. They are taught to be on time to go to school, to work and to do everything. When they are having a good time, they time goes easily. When a person is dying, they say he is living on borrowed time.

    Time is money. Time is knowledge. Time is {#blank#}2{#/blank#}in America. A working American has to work hard for eight hours a day or forty hours a week. This is the working time. In his free time, he also works hard for more money. Even on Saturday and Sunday he also works hard as {#blank#}3{#/blank#}. In the street you can hardly see a man walking{#blank#}4{#/blank#}. They walk very fast. In fact, they are running.

    They love time because time can bring them money and lots of things.{#blank#}5{#/blank#}sometimes they also hate time, because they feel they have become servants of the clock.

When I was in the third grade，I watched a video that showed the discovery of King Tutankhamen's tomb（陵墓）.I remember Carter，going through a narrow hole in the tomb with a candle.A workman asked what he could see."Wonderful things!"Carter said.From that moment，I knew what I wanted to do with my life.

So I decided what I wanted to be at the age of nine，and I made it happen.Seems easy，right？Not quite!The road wasn't easy!I did my studies—university（博士）.But along the way I was told many things，"Shawki was too young and she had no experience.She should get married and have kids".I also needed money（申请补助金）.The first five replies I got said no.Six months later the last reply came and I was excited about it.Finally，I could start my own digging.

Today，I'm lucky to work as an archaeologist（考古学家）.I study the lives of people who lived in Egypt's Nile Delta（埃及的尼罗河三角洲）

For anyone thinking about a job，I would say：Never give up.If you want to do something.keep trying.If people tell you"no"，use that—it will push you.At the beginning

Second，focus on your goals.You don't have to follow people.If they say something has never been done，make it happen.You may be the first to do it!There are always challenges

It is more than sixty years since the death of Lei Feng, and yet his spirit still influences Chinese young people. In fact, the wish to help others can always be found among common people. 

On September 5, 2022, when an earthquake hit Luding, Sichuan, a 28-ycar-old hydropower station (水电站) worker Gan Yu chose not to leave but stay at his workplace. saving villages from being damaged. People think he is a hero like Lei Feng. but he doesn't feel that he should be compared to the young hero. "Lei Feng is a role model to all Chinese young people. The things he did may seem small. but behind them was a great quality that we can all achieve." he said. 

Zeng Qiangfei, 24, is also from Sichuan. In 2013, when an earthquake happened in his hometown, he was studying in a middle school. Zeng remembered seeing rescuers (救援者) and volunteers gather there to help. When he grew up, he became a volunteer himself. After a terrible quake hit Turkey and Syria this year, he flew there to help. During the course, he always saw local people bowing quietly to volunteers like them. "I grew up listening to Lei Feng's stories. He is an excellent young man who tried his best to help others." said Zeng. 

This view is shared by a 56-year-old British man named James Elroy Edginton, who lives in Hunan. the hometown of Lei Feng. Working at a local college. Edginton volunteers to help students from poor families. and is warmly regarded as a "foreign Lei Feng". "I am glad to be connected with the spirit of Lei Feng. His qualities are borderless (无国界的) ." he said. 

It was a cold winter morning. My 12-year-old granddaughter, Jayne, sent me messages on the phone every hour during her six-hour drive to our house.

"Grandma, can you put some snow in the fridge (冰箱)? That way, I can feel snow when I get there," she wrote. Jayne lives in the south of Georgia, the US with her parents, so she never saw snow before.

"Yes, I will," I wrote. "There is still some snow on the ground in the yard." And I sent her a few photos of it. However, the weather report brought me bad news. It said the weather would be sunny at noon. This made me feel concerned.

In the afternoon, they finally arrived. Jayne got out of the car first. She ran into the yard and put her hands in the snow. She looked so excited. It was great that the sun didn't come out that day.

"Grandma, the weather is so cold, but I enjoy playing with snow," Jayne said. Then she started to build a snowman. She made two large snowballs first. They were the head and the body. It looked nice. Jayne kept playing outside until her hands got wet and cold. Watching Jayne playing in the snow made me feel warm and thankful.

I still remember the lovely cold day. Small things in our lives can also make us happy.