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    ChaiJing, who worked for China Central Television (CCTV) from 2001 to 2013 as a TV reporter made a documentary(纪录片) named under the Dome （穹顶之下）to educate the public about smog. It is released（发行）online on March 1^st, 2015.

    In the opening of the documentary, Chai tells the story of her daughter with a begin tumor （良性肿瘤）before her birth. “ I couldn't help worrying while seeing the polluted sky in Beijing,” she says. She only took her daughter outside when the air in Beijing was good. The rest of the time she had to keep her at home like a “prisoner（囚犯）”. And there were175 polluted days in 2014 in Beijing.

    In the  documentary, Chai had an interview with a six-year-old girl, WangHuiqin, who live in Shanxi Province, a heavily polluted area in China. The girl told Chai that she had never seen stars, blue skies or white clouds in her village.

    Chai also went to London and Los Angeles, which had both suffered air pollution in the past, to learn how they had improved their environment.

    Chai spent one year making this 103-minute film, which cost her over 1 million yuan. In the documentary, Chai tries to answer three questions. They are “ What is smog”, “ Where does it come from?” and “What should people do?” And she calls on everyone to get into the fight against smog.

    If you do not use your arms or your legs for some time, they will become weak; when you start using them again, they slowly become strong again. Everybody knows that. Yet many people do not seem to know that memory (记忆) works in the same way. When someone says that he has a good memory, he really means that he keeps his memory in practice by using it. When someone else says that his memory is poor, he really means that he does not give it enough chance (机会) to become strong.

    If a friend says that his arms and legs are weak, we know that it is his own fault (过错). But if he tells to us that he has a poor memory, many of us think that his parents may be to blame (责备), and few of us know that it is just his own fault. Have you ever found that some people can't read or write but usually they have better memories? This is because they cannot read or write, they have to remember the things. Since they cannot write them down in a small notebook, they have to remember days, names, songs and stories. Therefore, their memory is being exercised the whole time.

    So if you want to have a good memory, learn from the people：practise remembering things as other people do.

    If your pen broke at school today, what would you do? You would go to a shop and buy a new one. What if you could simply print out a real, working pen with your 3-D printer without leaving your room?

    Ten years ago people could only see 3-D printing in science fiction movies. But now 3-D printing is here and it's bringing big changes.

    Unlike normal printing that can only copy a 2-D picture with ink. 3-D printing can build almost anything made from material. The printer layers(分层) the material in different shapes to create the object you want to be copied.

    The 3-D printer has been used to make many different things. People have made cups, cars and even an airplane with it. Doctors have been using 3-D printers for several years. People's nervous systems(系统) have been printed out in 3-D form in medical research. Some body parts have been printed and used in hospital. Several months ago, doctors used a 3-D printer to rebuild the face of a person who had a bad accident. In the future, it is expected that the printer will make human organs(器官)to save more lives.

    However there are drawbacks to the printer. At the moment, printing can be quite slow and it's still rather expensive. The average(平均的) price of a household printer is around $1,700, not including the cost of the materials.

    But as the technology develops, it shouldn't be long before disadvantages are improved. Only time will tell where this new technology will take us.

    Most of us know that Ikea is the world's biggest furniture company. However, did you know that it's also a pioneer in environmental protection?

    Ikea says it's working hard to improve the environment. The company has made huge efforts to cut the carbon emissions(碳排放)of its suppliers(供应商).Over the past five years, Ikea has helped its suppliers become 18 percent more energy-efficient. It managed to do so by bringing its suppliers together. The one that produces the least carbon emissions will be praised.

    Ikea has also invested(投资)heavily in clean energy. The company now operates more than 300 wind turbines(叶轮机)around the world. It has also set up nearly 750,000 solar panels(太阳能嵌板)on the roof of its stores. As a result, Ikea can produce 71 percent of the energy it uses, which are all from clean sources. In some countries，such a} Denmark and Finland，the company produces as much energy as it uses.

    Ikea has been buying forests as well. It owns nearly 750 square kilometers of forest.

    Last but not least, Ikea has tried changing customers' behavior(行为).It does so by improving product designs. In 2015, Ikea changed all of its lighting products into LED. This change alone, it says, has saved lots of electricity.

    Earthquakes are hard to predict, but do you know what to do before, during and after an earthquake? Here's some advice:

    Before an earthquake. It's necessary to prepare yourself and your family. All family members should know how to turn off the gas, water and electricity and know useful telephone numbers (120, 110, 119, etc.). Never put heavy things over beds.

    During an earthquake. It's important for each of you to stay calm. If you are indoors, quickly move to a safe place in the room such as under a strong table. The purpose(目的) is to protect yourself from objects. Stay away from windows, large mirrors, heavy furniture and so on. If you're cooking, turn off the gas. If you're outdoors, move to an open area like a playground. Move away from buildings, bridges and trees. If you are driving, stop the car as soon as possible and stay away from bridges and tall buildings.

Stay in your car.

    After an earthquake. Once the shaking has stopped, DO NOT run out of the building at once. It's better to wait and leave when it's safe. Check around you and help the people who are in trouble. If your building is badly broken, leave it. If you smell the gas, get everyone outside and open windows and doors. If you can do it safely, turn off the gas. Report it to the gas company.

    How green are you? Do you know how to be green?

    We all need a healthy environment, but we produce waste every day and it does harm to our environment. Though we are young, we can still do something to help. In fact, even the simplest everyday activities can make a real difference to the environment. Here are some ideas for you.

    Reduce

    Reduce means "use less". Don't waste things. This saves money and reduces pollution and waste going into the environment. Before we buy something new, think whether it is really necessary or maybe the old one will be just as good! When we do buy things, choose local products if possible, and try not to buy too many things from abroad.

    Reuse

    Reuse means "use again". Use things for as long as possible. When we buy things, make sure that they last a long time. We should look after them so that they will last, and we should repair them if we can instead of throwing them away and buying new ones. Don't use a paper cup of a paper bag. It's better to use a china cup and a lunch box because you can use them again.

    Recycle

    Recycle means "change things into something else". Though it takes energy to change something into something else, it's better than throwing things away or burning them. Find out what can be recycled in your neighbourhood and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees.

    So please remember these three words: reduce, reuse and recycle.