Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to survive if the rain is spread throughout the year. If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form.

    Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes (沙丘) are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs (悬崖) and deep valleys were formed from thick mud that once lay under a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing –-very, very slowly —as these forces of nature continue to work on the rock.

    Most deserts have a surprising variety of life. There are plants, animals and insects that have adapted to life in the desert. During the heat of the day a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

    People say that one man can't make a difference, but Abdul Samad Sheikh, a 60-year-old rickshaw(人力车)driver from Bangladesh, has proved that doing a small thing over a long period of time can mean very much. He has planted at least one tree every day since he was 12 years old, which means that he has so far planted a small forest of over 17,500 trees. Imagine if everyone followed his example.

    Abdul has worked as a rickshaw driver for most of his life. He makes a little money from his job, which is only enough to put food on the table for his family, but he somehow tries to also buy at least one tree everyday. He considers it his duty to the world. Mostly he plants them on government land so nobody can cut them down later. He also them, and if he sees anyone cutting a tree, he blames them.

    Abdul, this wife Jorna, and four of their children live in two old houses, on a piece of land that is owned by the Faridpur deputy commissioner's office. They have no land of their own.

    Sometimes, she commands him not to plant trees but he doesn't listen. Abdul's 30-year-old son, Kutub Uddin, has never told his father not to plant trees, because he thinks his father does a good thing for society.

    Abdul's neighbors all know about his daily habit, and praise his work. Whoever can ask of him anything, he will do his best to help. Therefore, Abdul is loved by neighbors.

    For his efforts, Abdul Samad Sheikh was recently honored by The Daily Star, and given $1, 253 to help him build a better home for his family. The Daily Star hoped everyone to follow his example, and protect the environment.

     “I can't do it alone. I need the help of you all,” Abdul said in his speech.

    Forests are always losers at the Olympics, and that's unlikely to change anytime soon.

    For the winter games in PyeongChang, South Korea, virgin forest was destroyed on Mount Gariwang to accommodate ski runs. For the 2022 Winter Olympics in Beijing, a ski run is set to wipe out part of the Songshan National Nature Reserve And let's not forget the 240 acres of Atlantic Forest that were leveled for the 2016 games in Rio de Janeiro to make way for a golf course.

    For the upcoming Tokyo games, environmental and human rights advocates have been raising alarms about the use of tropical wood to build the New National Stadium. Activists have fought against such environmental destruction. The damage is often permanent, threatens endangered plants and animals and, in some cases, causes conflicts with native people But frequently the country's organizing committee, and the International Olympic Committee (IOC) have found ways to make it reasonable—despite a paragraph in the Olympic Charter that states that the IOC's role is to "encourage and support a responsible concern for environmental issues."

    As it stands now. the IOC has little authority over a city's local organizing committee, which finally plans the event, Chappelet, professor of public management at the University of Lausanne, told Earther. "Even if the IOC is dissatisfied with the way host cities have prepared for the games, they have no built-in systems to supervise (监督) them so that they strictly follow the Olympic Charter. The only thing they can do if they're not happy is to withdraw the right to organize the game. But the IOC could include more enforcement (执行) systems into the contract (合同) they make with the host city, he added. That contract must be signed and obeyed by everyone. Those who break it could be fined.

    Boykoff, the author of several books on the Olympics, suggested a similar solution. "The IOC could insist that host cities prioritize their ecological promises, but instead they look the other way, time and time again," he said.

    Galaxy saw a man and a woman who communicated with the sign language at the train station when she was on the way home one evening. She noticed that the woman asked the man for the direction. He told her that he did not know. Galaxy decided to help them. She had learned the sign language when she served as a volunteer in the deaf and mute （聋哑） school. Then she showed the woman the direction and left her email address to them in case they needed her help later.

    She received an email from that man the next day. Kazrim was his name. Galaxy replied his mail sincerely，They both started chatting online soon after and began seeing each other. Although they only communicated with the sign language, it never bothered her.

    Galaxy was fond of him gradually. Obviously, Kazrim was the same too. He presented Galaxy with a bunch of sunflowers and asked her sincerely, “Are you willing to be my girlfriend?”

    Galaxy was pleasantly surprised. She requested him to give her some time to persuade her parents.

    As she had expected，her parents were very angry after they had learned of their love story.

    Galaxy explained，“Kazrim is an excellent and a very optimistic person. He has a very positive attitude towards life and work. He cares for others always. He is 100％ better than the normal. Moreover, the mute is still a human. He should possess a perfect and wonderful love. ”

    Her parents asked to see him，then. The very worried Galaxy took Kazrim home a few days later. When they were on the train，Kazrim told her, “I'm going to tell your parents that I'll be looking after you well with all my life!” Galaxy was deeply moved.

    As soon as they had entered the house，Galaxy introduced him to her parents. She said, “This is Kazrim.” Just right after her speech，an unbelievable thing happened. Kazrim threw the gift away and held her in his arms tightly.

    He said. “YOU CAN TALK?” It was the same question that Galaxy wanted to ask，too.

    The four people were shocked all of a sudden. As a matter of fact, Kazrim always believed that Galaxy was a mute and he still fell in love with her deeply.

    It's a common belief that the roles actors play might somehow reflect their true personalities. It's usually not true, but British actress Phoebe Waller-Bridge, 34, is an exception.

    Just like Fleabag, the character she played in the comedy-drama series of the same name, Waller-Bridge feels that her life is a mess. "It's just really wonderful to know that a dirty and messed up woman can make it to the Emmys," she said. She may be "messed up", but Variety magazine calls her an "all-around icon".

    Last month, Waller-Bridge took home three Emmy awards for her work on Fleabag — best writing in a comedy series, best lead actress, and best comedy series.

    Her success is partly because of her family. Waller-Bridge was brought up in a free environment. Her mother always told her, "You can be whatever you want if you imagine it." So Waller-Bridge broke all the rules about what a "good" girl should do. "Our laws and moral codes don't apply — she lives without fear of consequence," The Sun noted.

    That fearlessness extends to being authentic (真实的) in her writing and acting. Unlike the can-do heroines and strong, successful women in many TV dramas, Waller-Bridge shows a flawed but real character. The character Fleabag was a screw-up who always found a way to say or do the wrong thing. "It resonated with the lives of stressed-out women everywhere in reality — doing their best to find balance in their lives," a viewer wrote on US movie website.

    Villanelle in Killing Eve, another hit TV series developed by Waller-Bridge, was a little bit violent but showed no interest for the rules others created, which make many people see themselves in her.

    "People have been scared to write characters like these. But I think, now, women are so relieved to have this new template (样板). And, aren't we all a bit of everything?" Waller-Bridge said in an interview with Indian Express.

    With such courage and sincerity, Waller-Bridge is, without a doubt, a "golden girl" in Hollywood, Australian news website The New Daily commented.

Natural selection is the process by which one type of animal within a species develops well because of certain characteristics that make it more likely to live than others in its group. The history of the peppered moth(桦尺蛾) is an example of the natural selection process.

In nineteenth-century England, certain types of peppered moths were able to better blend (融合) into their surroundings. During that time period, great changes were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air pollution. Natural selection usually takes hundreds or even thousands of years to occur. For the peppered moth, this process occurred relatively quickly .

At the beginning of the Industrial Age, most peppered moths in England were light-coloured and covered with black markings, although a few moths had dark-coloured wings. Because the light-coloured moths blended into the light-coloured bar k on the trees, they could not be easily seen by birds that would eat them. As the air grew more polluted, however, tree trunks (树干) became covered with soot (煤烟) and became darker. The light-coloured moths became easy for birds to see against the dark tree trunks. Since the dark-coloured moths now had the advantage, their numbers grew. Within 50 years, the peppered moth went from being mostly light-coloured to being mostly dark-coloured.

In the twentieth century, the air cleared up, and the peppered moth population changed again. As tree trunks lightened due to less soot in the air, light-coloured moths once again had an advantage. Their numbers increased as soot levels declined. Depending on their environment, the colouration of the moths helped them to be "naturally selected" to survive.